[go: up one dir, main page]

WO1999036660A1 - Centreur de tubage en bronze - Google Patents

Centreur de tubage en bronze Download PDF

Info

Publication number
WO1999036660A1
WO1999036660A1 PCT/GB1999/000033 GB9900033W WO9936660A1 WO 1999036660 A1 WO1999036660 A1 WO 1999036660A1 GB 9900033 W GB9900033 W GB 9900033W WO 9936660 A1 WO9936660 A1 WO 9936660A1
Authority
WO
WIPO (PCT)
Prior art keywords
casing
centraliser
well bore
blades
centralisers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/GB1999/000033
Other languages
English (en)
Inventor
Alan Leslie Male
Ray Mikolajczyk
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RAY OIL TOOL CO Ltd
Original Assignee
RAY OIL TOOL CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RAY OIL TOOL CO Ltd filed Critical RAY OIL TOOL CO Ltd
Priority to GB9921792A priority Critical patent/GB2339584A/en
Publication of WO1999036660A1 publication Critical patent/WO1999036660A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes

Definitions

  • This invention relates to casing centralisers for use in the completion of oil and gas wells wherein one or more strings of casing are "cemented" within the well bore where the strings have to be centralised and stabilized within the bore .
  • a cement slurry is pumped downwardly within each casing string and upwardly within the annulus thereabout, and thus between the well bore and the outermost string or between an inner string and the next outer string.
  • the cement column is of substantially uniform thickness about the casing, and, in any event, the casing should not lay up against the side of the well bore or outer casing. It is important that the casing be cemented in the center of the well bore in order to make better producing wells, prevent interzonal and intrazonal communication, and provide uniform loading which may prevent collapsed casing in the wells and zones that have a history of collapsing casing before the end like of the well. Properly centered casing is important not only in and across the production zones, but also in other zones to reduce bad cement jobs around protective casing shoe joints, and thus reduce expensive cement squeeze jobs for production and for getting good casing shoe seats.
  • centralisers are so placed on the casing that after the casing is run in the well bore, the centralisers will be in a position to support the casing off the side of the well bore in zones of interest.
  • a well bore is not a true vertical hole in the earth, but has areas of directional turns, bends, and vertical deviation changes.
  • casing When casing is run into the well bore it has to contour with the well bore.
  • the outline of the casing in the well bore may result in several or continuous contact with the well bore, with more severe contour changes resulting in more severe contacts.
  • This realisation makes a supportive casing centraliser a necessary tool towards centering the casing in a well bore to attain the desirable cement coverage around the casing.
  • centralisers which are used in the industry include aluminium centralisers, such as formed of Tenzalloy, and zinc alloy centralisers such as formed from the ZA range of Zinc alloys available from Brock metals. These centralisers, whilst being satisfactory for the purpose for which they were intended are not ideal.
  • a centraliser which, like those described above may be disposed about a casing joint, but which is of sufficiently rigid construction as to prevent collapse or bending, support the casing in deviated and crooked well bores and yet not unduly restrict the flow of drilling fluids and cement slurrys therepast, whilst operating reliably in increasingly high temperatures.
  • a casing centraliser which comprises a tubular body adapted to fit closely about a joint of casing and a plurality of blades extending longitudinally along the outer diameter of the body, the centraliser being formed of a material comprising a bronze alloy.
  • the blades of the centraliser are generally equally spaced apart around the outer diameter of the body.
  • each blade has opposite sides and ends which are tapered outwardly toward one another, and a relatively wide outer surface for bearing against the well bore or an outer casing in which the casing is disposed.
  • the centraliser is sufficiently strong to prevent collapse or bending out of shape, and instead will maintain the outer bearing surfaces in position to engage the well bore or an outer casing and enable the string to be raised or lowered through obstructions in the well bore.
  • the design of the blades provides sufficient cross sectional area between them for the passage of drilling fluids and the cement slurry.
  • Fig 1 is a vertical elevational view of a casing string within a well bore and showing centralisers disposed about adjacent joints of the casing string;
  • Fig 2 is an enlarged elevational view of one of the centralisers of Fig 1;
  • Fig 3 is a cross-sectional view of the centraliser as seen along broken lines 3-3 of Fig 2.
  • the well bore WB is substantially vertical, although it will be understood that it may deviate a rather substantial amount with respect to the vertical.
  • the diameter of the well bore is uneven throughout its length, with restricted areas at random points along its length.
  • the casing string CS is made up of a plurality of casing joints CJ, each having a box at one end and a pin at the other end for connection to adjacent joints making up the string.
  • Each of the centralisers is indicated in its entirety by reference number 10 and is disposed about a casing joint for maintaining the joint substantially centered within the well bore so that a cement column of substantially even thickness may form about the casing. It will be understood that the number and spacing of the centralisers along the length of the casing string may vary at the will of the operator of the well.
  • such centralisers comprise a tubular body 11 which is constructed to fit closely about the casing joint, as best shown in Fig 3, and a plurality of blades 12 which extend longitudinally along the outer diameter of the body thereto in generally equal spaced apart relation. More particularly, in the illustrated embodiment the body is of circumferentially continuous construction and of sufficient thickness for adequate strength. The side edges of adjacent blades are disposed apart to allow ample fluid passage, and yet provide bearing surfaces of ample width at the wall of the well bore.
  • the body of the centraliser is slipped over the pin end of the joint prior to make up of the pin with a box end on an adjacent casing joint.
  • the body and sleeve are made of a one piece mould casting of a bronze alloy which offers good corrosion resistance to the centraliser, superior strength and hardness along with self lubrication properties and a very low coefficient of friction. Furthermore, such a bronze alloy centraliser is able to withstand temperatures, maintaining the integrity of the alloy at temperatures exceeding 250°C, which more than doubles the temperature rating of any of the alloys presently being used as mentioned above. Additionally bronze alloys are non-sparking which allows the centralisers according to the present invention to be used in potentially hazardous working conditions.
  • the opposite sides 12A of the blades as well as the opposite ends 12B thereof are tapered outwardly toward one another and intersect the edges of a relatively large bearing surface 12C adapted to engage the well bore or outer casing to maintain the casing substantially centered therein.
  • the tapered ends 12B of the blades facilitate movement of the centraliser vertically through obstructions in the well bore.
  • the tapered sides 12A of the blades provide a wide open area between adjacent blades for the flow of cement slurry therethrough.
  • the centraliser is secured to the casing joint CJ as a desired position along the length thereof by means of set screws 13.
  • each set screw extends threadedly through holes in both the blade and the body so as to bear tightly against the outer diameter of the casing joint CJ. Since the screws extend through the thickest portion of the blade, they have the largest possible threaded connection thereto, As shown, two set screws extend through each end of the blade. If, on the other hand, the centraliser is not secured t the casing joint so that it is free to rotate with respect thereto, its axial movement may be limited to stop collars at one or both ends .
  • additional holes are drilled through one blade and the sleeve, and a permanent magnet 14 is mounted within the inner end of the hole in the body near the inner bore diameter.
  • the outer ends of the holes are preferably filled with a body 14A of plastics material. As above described, this provides a magnetic field which may be detected by a conventional wire line logging tool within the casing joint.
  • the alloy 115/836 was the best overall alloy for both temperatures. The calculated corrosion rates were low for both temperatures. The slight pitting and discoloration were minor compared to other alloys tested under the same conditions.
  • the alloy ZA-12 lost significant weight and integrity especially at 300°F.
  • the coupon turned purple and the metal surface began to flake off.
  • the acid used in the alloy 115/836 test remained relatively clear to light yellow throughout the test.
  • the pH of the acid mixture remained less than 1.0 for the duration of both test. The low pH indicates that the acid was not reacting with the coupons. A slight amount of white residue was noted at the end of Test #2.
  • the acid used in the alloy ZA-12 test had moderate hydrogen evolution which caused the bottles to leak. The acid became cloudy and a black and grey residue was noted.
  • a bronze alloy centraliser as described above is particularly suitable for the running of liners into a well bore, and with superior bearing characteristics and low friction values such centralisers will increase the probability of liner rotation within the bore. Furthermore, as described above, such centralisers can be run in wells in which the working temperatures within the well exceed 250°C.
  • a centraliser having a straight blade configuration
  • a centraliser according to the present invention may have any blade configuration such as, for example, straight blade or spiral blade.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

La présente invention concerne un centreur de tubage constitué, d'une part un corps tubulaire (11) conçu pour s'adapter intimement autour d'un joint du tubage, et d'autre part d'une pluralité de lames (12) longitudinales réparties sur le pourtour du corps. Ce centreur est réalisé en un matériau à base de bronze.
PCT/GB1999/000033 1998-01-16 1999-01-18 Centreur de tubage en bronze Ceased WO1999036660A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9921792A GB2339584A (en) 1998-01-16 1999-01-18 Bronze alloy casing centraliser

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9800885.7 1998-01-16
GBGB9800885.7A GB9800885D0 (en) 1998-01-16 1998-01-16 Casing centralisers

Publications (1)

Publication Number Publication Date
WO1999036660A1 true WO1999036660A1 (fr) 1999-07-22

Family

ID=10825373

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/000033 Ceased WO1999036660A1 (fr) 1998-01-16 1999-01-18 Centreur de tubage en bronze

Country Status (2)

Country Link
GB (2) GB9800885D0 (fr)
WO (1) WO1999036660A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0001435D0 (en) * 2000-01-22 2000-03-08 Downhole Products Plc Centraliser

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2554160A1 (fr) * 1983-10-28 1985-05-03 Petroles Cie Francaise Centreur pour cuvelage de puits de forage
US5095981A (en) * 1986-10-30 1992-03-17 Mikolajczyk Raymond F Casing centralizer
US5339896A (en) * 1993-05-06 1994-08-23 J. M. Huber Corp. Field installable rod guide and method
WO1995010685A2 (fr) * 1993-10-14 1995-04-20 Rototec Limited Dispositifs antifrictions de la tige de forage d'un tubage et d'un gainage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2554160A1 (fr) * 1983-10-28 1985-05-03 Petroles Cie Francaise Centreur pour cuvelage de puits de forage
US5095981A (en) * 1986-10-30 1992-03-17 Mikolajczyk Raymond F Casing centralizer
US5339896A (en) * 1993-05-06 1994-08-23 J. M. Huber Corp. Field installable rod guide and method
WO1995010685A2 (fr) * 1993-10-14 1995-04-20 Rototec Limited Dispositifs antifrictions de la tige de forage d'un tubage et d'un gainage

Also Published As

Publication number Publication date
GB2339584A (en) 2000-02-02
GB9800885D0 (en) 1998-03-11
GB9921792D0 (en) 1999-11-17

Similar Documents

Publication Publication Date Title
CA2887485C (fr) Outil de raclage et/ou de brossage de fond ameliore et des procedes apparentes
US20070209839A1 (en) System and method for reducing wear in drill pipe sections
US5095981A (en) Casing centralizer
EP1047859B1 (fr) Centreur de tubage extrude
EP1982039B1 (fr) Perfectionnements apportes a des outils fond de trou
EP0778914B1 (fr) Equipements pour l'installation de tubages comportant des elements externes reducteurs de friction
CA1231642A (fr) Dispositif centreur-stabilisateur de tubage
CA2320747C (fr) Centreur
US20020139537A1 (en) Method for enabling movement of a centralized pipe through a reduced diameter restriction and apparatus therefor
US6006830A (en) Casing centraliser
WO2004094767B1 (fr) Systeme de colonne perdue dilatee et procede associe
US9752204B2 (en) Precipitation hardened matrix drill bit
US20210025248A1 (en) Centralizer
WO1999036660A1 (fr) Centreur de tubage en bronze
GB2197008A (en) Casing centraliser
WO1996003568A1 (fr) Palier d'usure sacrificiel
NO20181512A1 (en) Modular reaming device
US20230323742A1 (en) Circumferential wear bands for oilfield tubulars
US12312877B2 (en) Centraliser
US20220098936A1 (en) Circumferential wear bands for oilfield tubulars
AU2013205035B2 (en) Improved downhole scraping and/or brushing tool
CA3052315C (fr) Produit tubulaire modulaire pour applications de puits
US20090211747A1 (en) Washpipe
TOOLS About company

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): GB US

ENP Entry into the national phase

Ref country code: GB

Ref document number: 9921792

Kind code of ref document: A

Format of ref document f/p: F

WWE Wipo information: entry into national phase

Ref document number: 09381313

Country of ref document: US