GB2493172A - A landing string including a separation assembly - Google Patents
A landing string including a separation assembly Download PDFInfo
- Publication number
- GB2493172A GB2493172A GB1112871.7A GB201112871A GB2493172A GB 2493172 A GB2493172 A GB 2493172A GB 201112871 A GB201112871 A GB 201112871A GB 2493172 A GB2493172 A GB 2493172A
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- landing string
- string according
- landing
- load
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- 238000000926 separation method Methods 0.000 title claims abstract description 99
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 8
- 238000005452 bending Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 6
- 238000013016 damping Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- SGPGESCZOCHFCL-UHFFFAOYSA-N Tilisolol hydrochloride Chemical compound [Cl-].C1=CC=C2C(=O)N(C)C=C(OCC(O)C[NH2+]C(C)(C)C)C2=C1 SGPGESCZOCHFCL-UHFFFAOYSA-N 0.000 claims 2
- 238000011068 loading method Methods 0.000 description 14
- 230000004888 barrier function Effects 0.000 description 5
- 230000000977 initiatory effect Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 241000272470 Circus Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
- E21B33/038—Connectors used on well heads, e.g. for connecting blow-out preventer and riser
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/06—Releasing-joints, e.g. safety joints
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/046—Couplings; joints between rod or the like and bit or between rod and rod or the like with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Warehouses Or Storage Devices (AREA)
- Load-Engaging Elements For Cranes (AREA)
Abstract
A landing string 10 for use in deploying equipment between a surface vessel 14 and a subsea well 16 comprises a separation assembly 42 which is configured to permit relative movement of upper 44 and lower 46 regions of the landing string 10 upon exposure to a predetermined load. The separation assembly 42 may be in the form of a rigid connection or a compliant connection which can allow for telescopic movement.
Description
LANDING STRING
HELD OF THE INVEN1]ON The present invention relates to a landing string, and in particular to a landing string which includes protection against excessive loading.
BACKGROUND TO THE INVENTION
Landing strings are used in the oH and gas industry for throughriser deployment of equipment, such as completion architecture, weH testing equipment, intervenUon tooling and the like into a subsea wefi from a surface vessel. When in a deployed configuration the landing string extends between the surface vessel and the welihead, for example a weUhead Slow Out Preventor (SOP). While deployed the landing string provides many functions, including perriithng the safe deployment of wireline or coHed tubing equipment through the landing string and into the well, providing the necessary primary well control barriers and permitting emergency disconnect while isolating both the wefi and landing string.
Wireline or coiled tubing deployment may he facilitated via a lubricator valve which is located proximate the surface vesse icr example below a rig floor.
WeH control and isolation in the event of an emergency disconnect is provided by a suite of valves which are located at a lower end of the landing string, normally positioned inside the ceritr bore of the BOP. This valve suite includes a lower valve assembly called the subsea test tree (SSTT) which provides a safety barrier to contain well pressure, and an upper valve assembly called the retainer valve which isolates the landing string contents and can be used to vent trapped pressure from between the retainer valve and SifT shear sub component extends between the retainer vaive and 85ff which is capable of being sheared by the BOP to permit an emergency disconnect. However, this ability to provide an emergency disconnect is limited only to when the landing string is fully deployed and the shear sub component is appropriately positioned w!thin the SOP.
The landing string must be capable of accommodating the significant inservice loadings, such as its own weight, the global tension from a supported lower string (e.g., a test sifing, completion or the like), bending loads, and the like. As the industry continues to move into fields with increasing formation and water depths, the resulting structural demands on the landing string also become more extreme. For example, landing string global tension requfrements far in excess of 4SMN (t000000 lbf) are typicaL Furthermore, the surface vessel and associated equipment, such as hangoff equipment, must So be capable of supporting the weight of the landing string and its payload. In some drcumstances the supported weight and loading may exceed the capadty of the surface vess& and associated eqthpment. This could result in damage to the surface vessel equipment, and possibly compromise wellbore containment.
SUMMARY OF THE INVENTiON
According to a first aspect of the present invention there is provided a landing string for use in deploying equipment between a surface vessel and a subsea well, comprising a separation assembly configured to permit relative movement of upper and ower regions of the landing string upon exposure to a predetermined load, The upper region of the landing string may be defined as that region which, in use, extends between the separation assembly and a vessel. The lower region of the landing string may be defined s that region which, in use, extends between the separation assembly and equipment to be, or being: deployed.
Although the terms "upper' and 1ower have been used, it should be understood that these are not intended to limit the precise orientation and geometry of the landing string. For example, some or aD of the landing string may be uWsed in a substantially vertical orientation, inclined orientation, horizontal orientation or the ftc.
In use, the separation assembly may permit a controlled relative movement of the upper and lower regions of the landing string at or around the predetermined load.
This controlled permission of relative movement will thereFore be provided at a predetermined location, i.e., the location of the separation assembly, The separation assembly may provide protection to the landing string against excessive loading. The separation assembly may provide protection to a surface vessel and/or any associated equipment, such as lifting or handling equipment or the like, against excessive loading. The separation assembly may provide protecUon to equipment being deployed, or previously deployed, against excessive loading.
Permitting controlled relative movement of the upper and lower regions of the landing string may assist to control transmission of load between said regions and along the landing string. For example, suoh relative movement upon exposure to a predetermined load may minimise or completely prevent the transmission of load between said regions of the landing string. This may assist to protect the landing string, a surface vessel and/or any supported equipment from excessive loading and forces.
The provision of a separation assembly which itself is configured to permit relative movement between upper and lower regions upon exposure to a predetermined load may offer significant advantages over prior art systems. For example, the present invention does not rely on specific ahgnment and interaction with external equipment, such as a BOP, to effect such rative movement, for example separation. Instead, the separation assembly may permft relative movement of upper and lower regions of the ending string at any time during use, for example during deployment between a vessel and a subsea well, whe deployed. during retrieval or the ike.
The predetermined cad may comprise a predetermined axial load. The predetermined load may comprise a predetermined tense load, Tense loading may be created by the weight of the landing string, for example the lower region of the landing string, and any supported equipment, Tense loading may be applied via any handhng or lifting equipment associated with a vessel, and/or any regions of interaction between the ending string and/or supported equipment with adjacent structure, such as wehbore structure and the like.
The predetermined oad may comprise a compressive load.
The predetermined load may comprise a torsional load.
The predetermined load may comprise a pressure induce load.
The separation assembly may define a linkage or connection between the upper and lower regions of the landing string.
The separation assembly may define a weak link or connection arrangement.
That is, the separation assembly may define a structurally weak region relative to the remainder of the landing string. In this way, any reaction to loading may he focused at the separation assembly.
The separation assembly may define a rigid connection between the upper and lower regions of the landing string prior to exposure to the predetermined load. Such a rigid connection may be intended to prevent any relative movement between the upper and lower regions unth exposure to the predetermined load.
The separation assembly may be configured to permit relative movement between the upper and lower regions upon exposure to the predetermined load whUe still defining a connection therebetween. In such an arrangement the separation assembly may define a compliant connection between the upper and lower regions fotlowng exposure to the predetermined load. Such cornpance may be provided to retain the upper and lower regions of the landing string in general engagement with each other whUe minimising the toad transference between said regions.
The separation assembly may be configured to damp r&ative movement between the upper and ower regions of the anding string foowing exposure to the predetermined toad. The separation assembly may comprise a fluid damping arrangement, such as a piston arrangement. nozzle arrangement or the ftc.
The separation assembly may be configured to permit complete separation of the upper and lower regions of the landing string. Such an arrangement may completely mechanicSty isoate the upper and lower regions.
The separation assembly may be configured to permit complete separation of the upper and lower regions from a rigid connection conFiguration upon exposure to the predetermined load. The rigid connection configuration may be a configuration in which the separation assembly provides a rigid connection beiween the upper arid lower regions of the landing string.
The separation assembly may be configured to permit compete separation ci the upper and lower regions from a compliant connection conFiguration upon exposure to a predetermined bad. The compliant connection configuration may be a configuration in which the separation assembly provides a compHant connection between the upper end lower regions of the landing string.
The separation assembly may be configured to define an initial rigid connection, and then a compUant connection upon exposure to the predetermined load, followed by complete separation upon exposure to the same, or a different predetermined load.
This arrangement may assist to prevent or minimise the risk of violent separation of the upper and lower landing string regions. Furthermore, this arrangement in which a compliant connection configuration is first established before complete separation may provide time to establish appropriate fluid barriers within the landing string, if required, to minimise any fluid leakage and the like, The predetermined load may be selected in accordance with operator preference. in some embodiments the predetermined load may be selected to be lower than a defined safety load associated with the remainder of the landing string.
Such a safety load may be defined by or be associated with a mechanical limit of proportionabty at which permanent deformation within the landing string occurs. Such a safety load may be defined by or be associated with a yield limit, Such a safety load may be defined by or be associated with a load at which one or more joints, connectors, flanges and/or the ke begins to separate within the landing string. In some embodiments the predetermined bad may be selected to be hwer than a faure load associated with the remainder of the landing string. The predetermined load may be selected to be lower than a safety load associated with a vessel, for example handUng or IftUng equipment mounted on a vesseL For example, the predetermined load may be selected to be lower than the lifting capacity of vessel handling equipment.
The separation assembly may comprise a release arrangement configured to initially secure the upper and lower regions of the landing string together, for example in a rigid manner, and permit or initiate relative movement of said regions upon exposure to the predetermined load. The release arrangement may comprise one or more frangible members which are configured to break and permit relative movement of the upper and lower regions upon exposure to the predetermined load, At east one frangible member may comprise a shearable member, such as a shear pin, shear ring or the ike. The release arrangement may comprise a frangible component which directly engages at east one of the upper and lower regions or associated components. The release arrangement may comprise a frangible component which indirectiy engages at least one of the upper and lower regions or assodated components. For example, a frangible element may engage a retention member such as a captive ring member or the like.
The release arrangement may be located intermediate the upper and lower region of the landing string. For example, the release arrangement may be located at an interface region between the upper and lower regions of the landing siring.
The separation assembly may comprise first and second separable components, wherein the first component is associated with the upper region of the 2$ landing string and the second component is associated with the lower region of the landing string. In some embodiments one or both of the first and second separable components may be integrally formed with a respective upper and lower landing string region. In some embodiments one or both of the first and second separable components may be separately formed and connected to a respective upper and lower landing string region, for example via a threaded connection or the like.
The first and second separable components may be secured together to permft connection between the upper and lower regions of the landing string. The first and second components may be rigidly secured together until exposure to the predetermined load. The i9rst and second separable components may be secured together by a release arrangement, such as a frangible release arrangement, for example as defined above.
The first and second separable components may define respective interface regions configured to permit said components to engage each other.
The first and second separable components may be configured to permit a telescoping movement therebetween. This t&escoping arrangement may permit relative movement between the upper and lower regions of the landing string whfle remaining connected together. Such telescoping movement may be permitted by the respective interface regions.
The interface regions may comprise respective interface surfaces configured to engage each other.
One of the first and second separable components may comprise or define a projection which is received within a recess formed within the other of the first and second separable components. The projection may define a cylindrical projechon, annular projection or the like, and the recess may correspond. The projection and recess may define tapered surfaces. Such an arrangement may assist in providing a smooth break-away from a rigid connection.
The first and second separable components may be configured to transmit bending between the upper and lower regions of the landing string. One or both of the first and second separable components may comprise one or a plurality of land-out plates, ribs or the like configured to permit transmission of bending.
The landing string may comprise at least one valve assembly. The landing string may comprise a plurality of valve assemblies.
The landing string may comprise a lower lve assembly. The hwer valve assembly may be located within the lower region of the landing string. The lower valve assembly may he located adjacent the separation assembly. The lower valve assembly may be configured to isolate the lower region of the landing string, for example foflcwing initiation of relative movement between the upper and lower regions of the landing string. The lower valve assembly may comprise or define a sub sea test tree (SSYI].
The landing string may comprise an upper valve assembly. The upper valve assemb'y may be located within the upper region of the landing string. The upper valve assembly may be located adjacent the separation assembly. The upper valve assembly may be configured to isolate the upper region of the landing string, for example following initiation of relative movemeni between the upper and lower regions of the landing string. The upper valve assembly may comprise or define a retainer vve.
The separation assembly may be interposed between upper and lower valve assenibhes, for example between an upper retainer valve and a lower $811.
The landing string may comprise a shearsub component configured to be sheared by eternal equipment, such as a SOP. The shear sub component may define a separable component oF the separation assembly.
The separation assembly may be located in a lower region of the landing string.
The separation assembly may he located within a region of the landing string which, in use, is to be located within a SOP.
The separation assembly may permit reconnection foowing complete separatbn of the upper and lower regions of the landing string.
The separation assembly may permit a rigid connection to be reinstated folbwing initiation of relative movement between the upper and lower regions of the landing string.
The landing string may be configured for temporary use. The landing string may be retrievabie. The landing string may be configured to define or form part of a permanent weH infrastructure, such as a completion.
The landing string may be adapted for use in well testing operations, production operations, intervention operations, deployment operations, well kill and abandoning operations or the like, or any suitable combination thereof.
The landing string may be configured for use in an exploration and appraisal well.
The landing string may he configured for use in a production well. The landing 2 string may be configured for use in an injection well.
The landing string assembly may be configured for subsea use, The landing string assembly may be adapted to extend through a riser, such as a marine riser.
The landing string may comprise a plurality of tubular members secured together, for example by end4oend threaded connections, welded connections or the like) The Lnding string may he configured for use in deep water.
The landing string may comprise a tubing hanger arranged to support a tubing string extending into an associated weW The wellhead assembly may comprise a manifold or the like.
S
The landing string may comprise a lubricator valve assembly configured to permit the passage of toollng and the like into the landing string.
Accordkig to a second aspect of the present invention there is provided a method of controlUng load transmission along a landing string, comprising: providing a separation assembly between upper and lower regions of a landing string; configuring the separation assembly to permit relative movement between the upper and lower regions of the landing string upon exposure to a predetermined load.
The method may comprise permitting complete separation of the upper and lower regions of the landing string via the separation assembly.
The method according to the second aspect may be performed by use of the landing string according to the first aspect. In this respect features and defined and implied uses of such features presented in relation to the first aspect may apply to the second aspect.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other aspects of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 illustrates a landing string which includes features according to embodiments of aspects of the present invention; Figure 2 is a crosssectional view of a separation assembly of the landing string arrangement of Figure 1; Figure 3 is a cross-sectional view of a portion of a separation assembly of a landing string in accordance with an alternative embodiment of the present invention; and Figures 4A to 4C are crosssectional illustrations of a separation assembly of a landing string according to a further embodiment of the present invention, showing sequences in operation.
DETAILED DESCRIPTION OF THE DRAWINGS
A landing string 10 is diagrammatically illustrated in Figure 1, shown in use within a riser 12 and extending between a surface vessel 14 and a subsea wellhead assemby 16 which includes a BOP 13 mounted on a wellhead 20. The use and functionality of landing strings are well known in the art for througft.riser deployment ci equipment, such as completion architecture, well testing equipment, intervention tooRng and the like into a subsea well from a surface vessel.
When in a deployed configuration the landing string 10 extends through the riser 12 and into the SOP 18. Whe deployed the landing string 10 provides many funcfions, including permithng the safe deployment of wireline or coed tubing equipment (not shown) through the landing string 10 and into the well providing the necessary primary well control barriers and permitting emergency disconnect while isolating both the well and landing string 10.
Wirehne or coiled tubing deployment may be facilitated via a lubricator valve 22 which is located proximate the surface vessel 14.
WeH control and isolation in the event of an emergency disconnect is provided by a suite of valves which are located at a lower end of the landing string 10 inside the SOP 18. The valve suite includes a lower valve assembly called the subsea test tree (SSTT) 24 which provides a safety harrier to contain well pressure, and also functions to cut any wireline or coiled tubing which extends through the landing string 10. The valve suite also includes an upper valve assembly called the retainer valve 26 which isolates the landing string contents and can be used to vent trapped pressure from between the retainer valve 26 and SSTT 24. A shear sub component 28 extends between the retainer vave 26 and SSTT 24 which is capable of being sheared by shear rams 30 of the SOP 18 if required. In this respect it should be noted that the shear sub component 28 may only be utUised when the landing string is fully deployed and aligned with the SOP shearing rams, A slick joint 32 extends below the SSTT 24 which facilitates engagement with SOP pipe rams 34.
The landing string 10 includes a tubing hanger 36 at its lowermost end which engages with a corresponding tubing hanger 38 provided in the wellhead 20. When the landing string 10 is fully deployed and the corresponding tubing hangers 36, 38 are engaged, the weight of the lower string (such as a completion, workover string or the like which extends into the well and thus not illustrated) becomes supported through the wehead 20. However, during deployment of the lower string through the riser 12 all the weight and other forces associated with the lower string must be entirely supported through the landing string 10. Furthermore, when deployed a degree of tension is conventionally applied to the landing string 10, for example to prevent adverse compressive forces being applied, for example due to the weight of the landing string 10, which can be significant in deep water.
The lanthng string 10 must thus be designed to accommodate significant in service loadings, such as the global weight/tension from a supported lower string.
However, in some appUcations it may be the case that global tension and loading could exceed safety rnits, and even faUure limits associated with the landing string 10 and components. Furthermore, in some instances the global weight or tension may approach or exceed the safe fflng capacity of handing equipment 40 associated with the vessel 14. The present invention seeks to address such issues by incorporating a separation assembly 42 into the ending string 10 which permits relative movement, specificMy axial movement, between an upper region 44 and lower region 46 of the landing string 10 upon exposure to a predetermined load. This relative movement may minimise or ehminate further transmission of load beiween upper and lower regions 44, 46. In the present embodiment the separation assembly 42 is interposed between the SSTT 24 and retainer valve 26 However, in other embodiments the separation assembly 42 could be located at any location along the landing string.
In some embodiments relative movement permitted by the separation assembly 42 may include complete separation of the upper and lower regions 44. 46. In other embodiments such relative movement may comprise reconfiguring from a rigid connection to a compliant connection between the upper and lower regions 44, 46. hi stifi further embodiments such relative movement may include initial reconfiguring from a rigid connection to a compUant connection, and then to complete separation.
Reference is now made to Figure 2 in which there is shown a cross sectional view of a separation assembly, generally identified by reference numeral 42a, in accordance with one embodiment of the present invention. In a similar manner to that described in relation to Figure 1, the separation assembly 42a is configured to permit relative movement between an upper region 44a and a lower region 46a of a landing string upon exposure to a predetermined load. It wi be recognised that the separation assembly 42a is shown in Figure 2 in a connected configuration in which a rigid connection between the upper and lower regions 44a, 46a of the landing string is present.
The separation assembly 42a in the lustrated embodiment is intended to be interposed between an upper retainer valve (not shown) and a lower SS1T (also not shown), although other configurations are possible, The separation assembly 42a comprises upper and lower separable components 48, 50, wherein the upper component 48 forms part of the upper region 44a of the landing string, and the lower component 50 forms part of the lower region 46a of the landing string. In the present ii embodmen( the upper component 48 may define or form part of the shear sub 28 shown in Figure 1. The lower component 50 may form part of the SSTT 24 shown in Figure 1 or, as in the present case. may define a latch connector which facilitates a latch connection with the SSTT 24.
The upper component 48 defines an annular rib or projection 52 which extends axialiy from a lower face 54 of the upper component 48 and is received within a compmentary annular recess 56 which extends into an end face 58 of the lower component 50. Although not iflustrated, a sealing arrangement may be provided between the end faces 54, 58. A plurality of circumferentiay arranged shear pins 60 hold the rIb 52 within the recess 56 to establish a rigid connection between the upper and lower components 48, 50. In this arrangement the pins 60 function to transmit loading, particularly tensile loading between the components 48. 50 when connected, Furthermore, the pins 60 are configured to shear upon exposure to a predetermined load, specifically a predetermined axial (in this case tensile) load transmitted along the landing string and through the separation assembly 42a. Upon shearing of the pins 60 complete separation of the components 48, 50 and thus upper and lower regions 44a, 46a of the landing string occurs. This prevents further load transmission across the separation assembly 42a which may provide a number ol benefits. For example, this arrangement may remove the load of the lower region 46a of the landing string and any supported ecuipment from the surface vessel 14, such as the surface vessel handling equipment 40 (Figure 1), preventing its capacity from being exceeded.
The rIb 52 and recess 56 define a complimentary tapered profile. Such a proFile assists smooth separation of the components 48, 50.
An alternative arrangement of a landing string separation assemby, in this case generaHy identified by reference numeral 42b is illustrated in Figure 3. The separation assembly 42b is intended to be interposed between an upper retainer valve (not shown) and a lower SSTT (also not shown), although other configurations are possible.
The separation assembly 42b comprises upper and lower separable components 62, 64, wherein the upper component 62 forms part of an upper region 44b of the landing strng, and the lower component 64 forms part of the lower region 46b of the landing string, in the present embodiment the upper component 62 may define or lorm part of the shear sub 28 shown in Figure 1 The lower component 64 may form part of or be connected to the SSTT 24 shown in Figure 1 The upper component 62 comprises an upset end 66 which is received within a counterbore 68 formed in the lower component 64. A number of axially arranged cfrcumferentia ribs or plates 70 are formed in one or both of the upset end 66 and counitrbore 68 to facffitate the transmission of bending across the separation assembly 42b. A captive ring 72 is secured to the lower component 64 via one or a plurality of shear pins 74 (only one shown), wherein the captive ring 72 and shear pins(s) 74 provide a substantiaUy rigid connection between the upper and lower components 62, 64. The pin(s) 74 isfare configured to shear upon exposure to a predetermined load, spedflcSly a predetermined axial (in this case tcnse) load transmitted along the landing string and through the separation assembly 42b. Upon shearing of the pin(s) 74 complete separatbn of the components 62, 64 and thus upper and lower regions 44b, 4Gb of the landing string occurs, A further embodiment of a landing string separation assembly, in this case generafly identified by reference numeral 42c, is shown in Figures 4A to 4C, wherein Figures 4A to 4C provide sequential illustrations of separation of the separsUon assembly 42c.
The separation assembly 42c comprises upper and lower separable components 82, 84, wherein the upper component 82 forms part of an upper region 48c of the landing string, and the lower component 84 forms part of the lower region 46o of the landing string. In the present embodiment the upper component 82 may define or form part of the shear sub 28 shown in Hgure 1. The lower component 84 may form part of or be connected to the SSTT 24 shown in Figure 1 The upper component 82 is initially partiaUy located within the lower component 84, as shown in Figure 4A, and a rigid connection is achieved via a plurality of shear screws 86. Upon exposure to a predetermined tensile load applied through the separation assembly 42c the shear screws 86 will shear, permitUng relative axial telescoping movement of th.e upper and lower components 82, 84, as shown in Figure 48. In this configuration the upper component 82 remains inserted within the lower component 84, prevented from complete release by a captive ring 88, such that a compliant connection between the components 82, 84 is established. Such a compliant connection may provide appropriate time to set in place fluid barriers, such as by actuation of the SSTT 24 and retainer valve 26. Also, such a compliant connection may prevent a violent separation of the upper and lower component 82, 84 from occurring. An annular region 80 delined between the components 82, 84, as shown in Figure 4k may comprise a fluid which is e)ected via restrictions 92 upon relative movement of the components 82, 84 which may establish a degree of damping.
As shown in Figure 48, the captive ring 88 is secured to the lower component 84 via a plur&ity of shear screws 94 which are configured to shear when a predetermined tensile load is again appUed through the assembly 42c, permitting complete separation of the components 82, 84, as iUustrated in Figure 4C. The shear S screws 86 and shear screws 94 may be arranged to sheer upon exposure to the same or a different predetermined load.
in the embodiment shown in Figure 4 the separation assembly 42c is configured to provide protection against a predetermined tense load, However, the assembly 42c may also provide protection against a predetem*'ed compressive bad.
U should be understood that the embodiments described herein are merely exemplary and that various modifications may be made thereto without deparUng form the scope of the present invention, For example, in the various embodiments described above shear screws are used to provide a means of disconnection upon exposure to a predetermined had. However, other arrangements are possible. For example, a rated etching system may be utilised which permit unlatching upon exposure to a predetermined load. Further, a retractable dog arrangement may be utilised. Also, in some embodiments the upper and lower components of the separation assembly may be configured to be reconnected.
Claims (1)
- <claim-text>CLAIMS: 1. A landing string for use in deploying equipment between a surface vessel and a subsea wefi, comprising a separation assembly configured to permit relative movement of upper and lower regions of the landing string upon exposure to a predetermined load.</claim-text> <claim-text>2. The landing string according to clam 1, wherein, in use, the separation assembly permits a controed relative movement of the upper and lower regions of the landing string at or around the predetermined load.</claim-text> <claim-text>3. The landing string according to claim I or 2, wherein controed relative movement of the upper and lower regions of the landing string controls transmission of load between said regions and Song the landing string.</claim-text> <claim-text>4. The landing string according to claim 1 2 or 3, wherein the predetermined load comprises a predetermined axial load.</claim-text> <claim-text>5. The landing string according to any preceding claim, wherein the predetenthned load comprises a predetermined tensile load.</claim-text> <claim-text>6. The ending string according to any preceding claim, wherein the predetermined load comprises at east one of a compressive cad, a torsional load and a pressure induce load.</claim-text> <claim-text>7, The landing string according to any preceding claim, wherein the separation assembly defines a linkage or connection between the upper and lower regions of the landing string.</claim-text> <claim-text>8. The landing string according to any preceding claim, wherein the separation assembly defines a weak link or connection arrangement.</claim-text> <claim-text>9. The landing string according to any preceding claim, wherein the separation assembly defines a rigid connection between the upper and lower regions of the landing string prior to exposure to the predetermined load.</claim-text> <claim-text>10. The landing string accorthng to any preceding claim, wherein the separation assembly is configured to permit relative movement between the upper and lower regions upon exposure to the predetermined load wMe cliii definhig a connection therebetween.</claim-text> <claim-text>11. The landing string according to any preceding claim, wherein the separation assembly defines a compant connection between the upper and lower regions foowing exposure to the predetermined load.</claim-text> <claim-text>12. The landing string according to claim ii, wherein the compilant connection retains the upper and ower regions of the landing string in general engagement with each other while rninirnising the load transference between said regions.</claim-text> <claim-text>13. The landing string according to any preceding claim, wherein the separation assembly is configured to damp relative movement between the upper and lower regions of the landing string following exposure to the predetermined load.</claim-text> <claim-text>14. The landing string according to claim 13, wherein the separation assembly comprises a fluid damping arrangement for damping relative movement between the upper and lower regions of the landing suing.</claim-text> <claim-text>15. The landing string according to any preceding claim, wherein the separation assembly is configured to permit complete separation of the upper and lower regions of the landing string.</claim-text> <claim-text>16. The landing string according to claim 15, wherein the separation assembly is configured to permit complete separation of the upper and lower regions from a rigid connection configuration upon exposure to the predetermined load.</claim-text> <claim-text>17. The landing string according to claim 15, wherein the separation assembly is configured to permit complete separation of the upper and lower regions from a compliant connection configuration upon exposure to a predetermined load.</claim-text> <claim-text>18. The landing string according to claim 15, wherein the separafion assembly is configured to define an initial rigid connection, and then a compliant connection upon exposure to the predetermined load, followed by complete separation upon exposure to the same, or a different predetermined load.</claim-text> <claim-text>19. The landing string according to any preceding claim, wherein the predetermined load is selected in accordance with operator preference.</claim-text> <claim-text>20. The landing string according to any preceding claim, wherein the predetermined load is selected to be lower than a defined safety load associated with the remainder at the landing string.</claim-text> <claim-text>21. The landing string according to any preceding claim, wherein the predetermined load is selected to be lower than a safety load associated with a vessel.</claim-text> <claim-text>22. The landing string according to any preceding ciaim, wherein the separation assembly comprises a release arrangement configured to initiafly secure the upper and lower regions of the landing string together and permit or initiate relative movement of said regions upon exposure to the predetermined load.</claim-text> <claim-text>23. The landing string according to claim 22, wherein the release arrangement comprises one or more frangible members which are configured to break and permit relative movement of the upper and lower regions upon exposure to the predetermined load.</claim-text> <claim-text>24. The landing string according to any preceding claim, wherein the separation assernbiy comprises first and second separable components, wherein the first component is associated with the upper region of the landing string and the second component is associated with the lower region of the landing string.</claim-text> <claim-text>25. The landing string according to claim 24, wherein one or both of the first and second separable components are integrally formed with a respective upper and lower landing string region.</claim-text> <claim-text>26. The landing string according to clm 24 or 25, wherein one or both of the first and second separable components are separately formed and connected to a respective upper and lower tanding string region.</claim-text> <claim-text>27. The landing string according to daim 24, 25 or 26, wherein the first and second separable components are secured together to pemift connection between the upper and lower regions of the landing string.</claim-text> <claim-text>28. The landing string according to any one of Sims 24 to 27, whereLi the flrst and second components are rigidly secured together until exposure to the predetermined load.</claim-text> <claim-text>29. The landing string according to any one of Sims 24 to 28, wherein the first and second separah components are secured together by a release arrangement. irV</claim-text> <claim-text>30. The landing string according to any one of claims 24 to 29, wherein the first and second separable components are configured to permit a telescoping movement therebetween, 31. The landing string according to any one of claims 24 to 30, wherein one of the first and second separable components comprises or defines a projection which is received within a recess formed within the other of the first and second separable components.32. The landing string according to clarn 31. wherein the projecfion and recess define tapered surfaces.33. The landing string according to any one of claims 24 to 32, wherein the first and second separable components are configured to transmit bending between the upper and lower regions of the landing string.34. The anding string according to any one of claims 24 to 33, wherein one or both of the first and second separable components comprise one or a pluralis of landout plates, ribs or the like configured to permit transmission ci bending.35. The landing string according to any preceding daim, comprising at least one vSve assembly.36. The landing strinc according to any preceding claim, comprising a lower valve assemby located within the lower region of the lanthng string.37. the Lnding string according to claim 36, wherein the lower valve assembly comprises or defines a sub sea test tree (SSrT).38. The landing string according to any preceding claim, comprising an upper valve assembiy located within the upper region of the landing string.3g. The landing string according to claim 38, wherein the upper valve assembly comprises or defines a retainer valve.40. The landing string according to any preceding claim, comprising a sheaNsub component configured to be sheared by eternal equipment, such as a GOP.41. A method of controlUng load transmission along a landing string, comprising: providing a separaton assembly between upper and lower regions of a landing string; configuring the separation assembly to permit r&ative movement between the upper and lower regions of the ending string upon exposure to a predetermined load.</claim-text>
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1112871.7A GB2493172A (en) | 2011-07-27 | 2011-07-27 | A landing string including a separation assembly |
| EP12753788.4A EP2737158A2 (en) | 2011-07-27 | 2012-07-24 | Landing string |
| US14/131,520 US20140190703A1 (en) | 2011-07-27 | 2012-07-24 | Landing string |
| CA2842545A CA2842545A1 (en) | 2011-07-27 | 2012-07-24 | Landing string |
| BR112014001766A BR112014001766A2 (en) | 2011-07-27 | 2012-07-24 | seating column, and method of controlling load transmission along a laying column |
| AU2012288618A AU2012288618A1 (en) | 2011-07-27 | 2012-07-24 | Landing string |
| PCT/GB2012/051771 WO2013014440A2 (en) | 2011-07-27 | 2012-07-24 | Landing string |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1112871.7A GB2493172A (en) | 2011-07-27 | 2011-07-27 | A landing string including a separation assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201112871D0 GB201112871D0 (en) | 2011-09-07 |
| GB2493172A true GB2493172A (en) | 2013-01-30 |
Family
ID=44652366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1112871.7A Withdrawn GB2493172A (en) | 2011-07-27 | 2011-07-27 | A landing string including a separation assembly |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20140190703A1 (en) |
| EP (1) | EP2737158A2 (en) |
| AU (1) | AU2012288618A1 (en) |
| BR (1) | BR112014001766A2 (en) |
| CA (1) | CA2842545A1 (en) |
| GB (1) | GB2493172A (en) |
| WO (1) | WO2013014440A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016001630A3 (en) * | 2014-06-30 | 2016-02-25 | Interventek Subsea Engineering Limited | Subsea landing string assembly |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9260931B2 (en) | 2013-03-11 | 2016-02-16 | Bp Corporation North America Inc. | Riser breakaway connection and intervention coupling device |
| EP3014050B1 (en) * | 2013-06-28 | 2020-06-17 | Services Petroliers Schlumberger | Subsea landing string with autonomous emergency shut-in and disconnect |
| US10087688B2 (en) * | 2015-02-12 | 2018-10-02 | Baker Hughes, A Ge Company, Llc | Energy absorption system for subterranean tool high impact loads |
| EP3551837A4 (en) * | 2016-12-08 | 2020-07-29 | Kinetic Pressure Control, Ltd. | Explosive disconnect |
| US11187052B2 (en) * | 2016-12-08 | 2021-11-30 | Kinetic Pressure Control Ltd. | Explosive disconnect |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020066557A1 (en) * | 2000-05-19 | 2002-06-06 | Hamilton Scott M. | Tubing hanger landing string with blowout preventer operated release mechanism |
| WO2010089525A1 (en) * | 2009-02-04 | 2010-08-12 | Expro North Sea Limited | Landing string assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4995464A (en) * | 1989-08-25 | 1991-02-26 | Dril-Quip, Inc. | Well apparatus and method |
| GB2376249B (en) * | 1999-11-10 | 2003-06-11 | Cooper Cameron Corp | Adjustable sub-tension hanger |
| GB2416361B (en) * | 2003-03-18 | 2007-09-05 | Enventure Global Technology | Apparatus and method for running a radially expandable tubular member |
| AU2009234273B2 (en) * | 2008-04-10 | 2011-12-08 | Weatherford Technology Holdings, Llc | Landing string compensator |
| US8167312B2 (en) * | 2008-07-10 | 2012-05-01 | Vetco Gray Inc. | Metal seal adjustable casing sub |
-
2011
- 2011-07-27 GB GB1112871.7A patent/GB2493172A/en not_active Withdrawn
-
2012
- 2012-07-24 US US14/131,520 patent/US20140190703A1/en not_active Abandoned
- 2012-07-24 AU AU2012288618A patent/AU2012288618A1/en not_active Abandoned
- 2012-07-24 BR BR112014001766A patent/BR112014001766A2/en not_active IP Right Cessation
- 2012-07-24 CA CA2842545A patent/CA2842545A1/en not_active Abandoned
- 2012-07-24 EP EP12753788.4A patent/EP2737158A2/en not_active Withdrawn
- 2012-07-24 WO PCT/GB2012/051771 patent/WO2013014440A2/en not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020066557A1 (en) * | 2000-05-19 | 2002-06-06 | Hamilton Scott M. | Tubing hanger landing string with blowout preventer operated release mechanism |
| WO2010089525A1 (en) * | 2009-02-04 | 2010-08-12 | Expro North Sea Limited | Landing string assembly |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016001630A3 (en) * | 2014-06-30 | 2016-02-25 | Interventek Subsea Engineering Limited | Subsea landing string assembly |
| GB2540920A (en) * | 2014-06-30 | 2017-02-01 | Interventek Subsea Eng Ltd | Subsea landing string assembly |
| GB2540920B (en) * | 2014-06-30 | 2020-10-07 | Interventek Subsea Engineering Ltd | Subsea landing string assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201112871D0 (en) | 2011-09-07 |
| AU2012288618A1 (en) | 2014-01-23 |
| BR112014001766A2 (en) | 2017-02-21 |
| EP2737158A2 (en) | 2014-06-04 |
| WO2013014440A2 (en) | 2013-01-31 |
| WO2013014440A3 (en) | 2013-12-05 |
| US20140190703A1 (en) | 2014-07-10 |
| CA2842545A1 (en) | 2013-01-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |