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WO2002018738A1 - Procede ameliore de forage de puits multilateraux et dispositif correspondant - Google Patents

Procede ameliore de forage de puits multilateraux et dispositif correspondant Download PDF

Info

Publication number
WO2002018738A1
WO2002018738A1 PCT/US2001/041914 US0141914W WO0218738A1 WO 2002018738 A1 WO2002018738 A1 WO 2002018738A1 US 0141914 W US0141914 W US 0141914W WO 0218738 A1 WO0218738 A1 WO 0218738A1
Authority
WO
WIPO (PCT)
Prior art keywords
well
bore
cement
guide
lateral
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/US2001/041914
Other languages
English (en)
Inventor
Jean P. Buytaert
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.)
Franks International LLC
Original Assignee
Franks International LLC
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 Franks International LLC filed Critical Franks International LLC
Priority to AU2001287211A priority Critical patent/AU2001287211A1/en
Publication of WO2002018738A1 publication Critical patent/WO2002018738A1/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
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
    • E21B33/138—Plastering the borehole wall; Injecting into the formation
    • 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
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/0035—Apparatus or methods for multilateral well technology, e.g. for the completion of or workover on wells with one or more lateral branches
    • E21B41/0042—Apparatus or methods for multilateral well technology, e.g. for the completion of or workover on wells with one or more lateral branches characterised by sealing the junction between a lateral and a main bore

Definitions

  • the present invention relates generally to an improved method for drilling multi-lateral wells and related device. More particularly, the present invention relates to an improved method for drilling one or more multi-lateral wells from an existing well whereby the junction about the lateral well is sealed.
  • Drilling or utilizing multi-lateral or horizontal wells has become increasingly popular for enhancing production and recovery of oil and gas from well-bores.
  • Multi-lateral drilling methods have become increasingly popular for enhancing production and recovery of oil and gas from well-bores.
  • Multi-lateral wells have been found very effective in areas where the pay-zone or
  • oil/gas deposit may be thin or hard to reach with standard down-hole drilling operations.
  • one of the primary reasons an operator would drill a multi-lateral well is to take advantage of the existence of a previously drilled wellbore. In drilling a multi-lateral well, a
  • the present invention is an
  • a guide means defined as comprised of three main parts; a lower end, a central part
  • This method has effectively drilled multi-lateral wells, but does not insure
  • the art field is in search of a method to drill a lateral well and to establish
  • a sealed junction about one portion of the lateral well, such as between the lateral well and the
  • this method does not necessarily
  • Another difficulty encountered with the prior art method disclosed in the '503 patent is the practical impossibility of the method to effectually warranty the seal of the junction with the passage of time.
  • the method discloses using conventional techniques to cement about the junction, such as flowing cement into the well-bore and allowing the cement to fill the interstices
  • the art field desires a method that effectively fills the area where a junction is to be
  • the present invention generally relates to the an improved method of drilling multi-lateral
  • lateral well to be drilled that is substantially the size of the primary well-bore. More particularly,
  • Fig. 1 is an illustration of an existing well-bore, cased and cemented.
  • Fig. 2 is an illustration of a well-bore where the casing has been milled out at the pre ⁇
  • Fig. 3a is an illustration of an under-reamed area of an embodiment of the present invention.
  • Fig. 3b is an illustration of the prior art under-reaming operation.
  • Fig. 3c is an illustration of a top side view of the under-reaming required under
  • Fig. 3d is an illustration of a top side view of the under-reaming required under
  • Fig.4a is an illustration of a pre-bent guide run into the well-bore at about the preselected
  • Fig. 4b is an illustration of a pre-bent guide with an inflatable packer element run into
  • Fig.4c is an illustration of a guide run into the well-bore at about the preselected under-
  • Fig. 4d is an illustration of a guide with an inflatable packer element run into the well-
  • Fig. 5a is an illustration of an embodiment of the present invention where an epoxy
  • Fig. 5b is an illustration of an embodiment of the present invention where an epoxy
  • Fig.6a is an illustration of an embodiment of the present invention where a path is drilled
  • Fig.6b is an illustration of an embodiment of the present invention where a path is drilled
  • Fig. 7 is an illustration of a completed drill path through a preselected location.
  • Fig. 8 is an illustration of an orienting sleeve and whipstock in the drill path.
  • Fig.9 is an illustration of an embodiment of the present invention whereby a lateral well-
  • Fig. 10 is an illustration of a completed lateral bore.
  • Fig. 11 is an illustration of the completed lateral bore with a liner installed.
  • Fig. 12 is an illustration of the completed, lined lateral bpre with a bridge installed.
  • Fig.13 is an illustration of the completed, lined, bridged lateral bore where the whipstock
  • FIG. 1 an existing primary well-bore, cased and cemented, a typical
  • Fig. 1 generally describes an area where a lateral well is desired.
  • the figure is illustrative of a well that is completed with steel casing 1 and cement 2 around well-bore 3.
  • the manner of selection of an area to drill a lateral well-bore may be by any means common in the art, however, most typically the selected location is where an operator desires to drill a new well, drill to a new target.
  • this list is not exhaustive and there are numerous other reasons an operator may
  • the area selected for the lateral well is generally defined as
  • FIG. 2 an illustration of a
  • Section milling is common in the art. However, an exemplary section milling operation
  • the 3 may include the steps of lowering a drill string 7 into the well bore 3, the drill string 7 having a conventional section mill 8 operateably attached about the drill string 7.
  • the section mill 8 will be stopped above the preselected location 6 and begin
  • the section milling may and should cause the section mill 8 to engage the casing 1 and destroy substantially all of the casing 1 about the pre-selected location
  • An operator may thus lower the drill string 7 to a point below the preselected point while keeping the section mill engaged thereby destroying or removing the casing from a point above the preselected location 6 to a point below the preselected location 6. After completion of the section milling step, the operator should have removed substantially all of the casing along location 6.
  • FIG. 3b an illustration of an embodiment of the prior art under-reaming operation
  • Embodiments of the present invention are designed for establishing a
  • the present invention utilizes an under-reamed area that is only about two to 2.5 times the
  • FIG. 3a an illustration of an embodiment of the present inventions under-reaming
  • well -bore width 13 is only enlarged to under-reamed width 12.
  • width 12 to borehole width 13 is about 2.0 to 2.5 whereas prior art ratios and ratios of
  • borehole width 13 is about 3.5. Accordingly, embodiments of the present invention do not require as much of an under-reaming operation. As previously discussed, a large under-reaming
  • borehole width 13 is about two to 2.5.
  • FIG. 4a an illustration of pre-bent guide run into the well-bore at about
  • the pre-bent guide 26 is not straight along the path of well-bore 3, but rather is arcuate at about the preselected location 6, returning to about straight along the remaining path of well-bore 3 at the lower end of preselected location 6.
  • a preselected guide is lowered into the well-bore 3 to
  • present invention may be used with a straight guide 27 running through well-bore 3 , as illustrated
  • the guide 27 may extend through preselected location 6.
  • FIG. 4b an illustration of a pre-bent guide with an inflatable packer
  • pre-bent guide 26 is surrounded by an inflatable packer element 18. Further, pre-bent guide 26 is not straight along the path of well -bore 3, but rather is arcuate at about the preselected
  • a preselected guide is
  • an arcuate guide at about the preselected location 6.
  • embodiments of the present invention may be used with a straight guide running through well-bore 3, as illustrated in Fig. 4d.
  • an embodiment with a straight guide 27 an embodiment with a straight guide 27, an
  • inflatable packer element 19 may also be utilized.
  • a cement 41 material has been injected into the well-bore to fill about the preselected location 6, it may be observed that a guide 26 still defines an arcuate path and the cement 41 has completely filled about the pre-bent guide.
  • Another embodiment utilizes an epoxy cement material produced from apumpable material of epichlorohydrin and bisphenol that hardens after
  • materials will include a liquid diluent containing a substance to allow the epoxy to have a sufficient viscosity to allow the epoxy material to be pumped into the well-bore 3 and completely fill about the preselected location 6.
  • a liquid diluent containing a substance to allow the epoxy to have a sufficient viscosity to allow the epoxy material to be pumped into the well-bore 3 and completely fill about the preselected location 6.
  • another preferred embodiment of the present invention utilizes an additive within the material pumped to change the time of hardening of the
  • the additive may either be a retardant to prevent premature hardening or setting up of
  • a most preferred embodiment of the present invention utilizes a pre-bent guide 26 (as
  • FIG. 4b depicted in Fig. 4b that is surrounded by an inflatable packer 18.
  • the inflatable packer 18 is
  • the inflatable packer 18 is preferably about the pre-bent guide 26 in the area of preselected
  • packers may be inflated (not shown) such that the inflation completely fills the under-reamed area.
  • Inflation of packers is common in the art and may be accomplished as known in the art.
  • a typical method of inflating a packer pumps cement or other substance into the packer to inflate, a preferred substance is an epoxy resin such as an armoured epoxy.
  • inflatable packer 18 on the pre-bent guide 26 will ensure that upon inflation no contaminant from the formation will become mixed with the cement and reduce the hardening of the material and sealing effect about the junction and also will ensure that the under-reamed cavity is substantially filled with a cement or epoxy resin material.
  • FIG.6a an illustration of an embodiment of the present invention
  • a path is drilled through the hardened cement 41 along the guide path with a pilot mill 37, it may
  • Fig. 6b illustrates an embodiment of the
  • FIG. 7 an illustration of a completed drill path through a preselected
  • a sleeve 47 and whipstock 46 may be aligned within the drill path 44 within the preselected location 6.
  • an orientation sleeve 47 is lowered, . oriented and anchored in well-bore 3 and a whipstock 46 is then placed about the sleeve 47 such that an angle 50 may be created away from the drill path 44.
  • Angle 50 may be created away from the drill path 44.
  • FIG. 9 an illustration of an embodiment of the present invention
  • Drill string 56
  • whipstock 57 may be lowered to whipstock 57 where it will be deflected into cement 41 to begin drilling a
  • lateral well-bore 61 may be
  • FIG.3c an illustration of a top side view of the under-reaming required
  • the area of under-reaming may be reduced to about two to 2.5 times the
  • the newprimarybore 15 is established after drilling along the pre-bent guide and the lateral well
  • the arcuate pre- bent guide shifts the well-bore from the general center of the under-reamed area towards the side.
  • the lateral well-bore 61 may be established within the reduced under-reamed area 24.
  • under-reaming area 25 is about 3.0 times the
  • lateral well-bore 19 requires an under-reamed width of about 3.0 times the
  • embodiments of the present invention allow the lateral well 61 to be drilled to
  • the lateral well 61 is compatible with conventional drilling methods and equipment and does not
  • Fig. 10 is an illustration
  • the orienting sleeve is of comparable size to the primary well-bore.

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

Abstract

L'invention concerne un procédé amélioré de forage d'un puits multilatéral (61) dans un sondage (3) déjà existant, une partie de ce puits étant alésée, remplie de résine époxyde, forée latéralement, puis complétée avec un raccordement étanche (6). Plus précisément, l'invention concerne un procédé amélioré facilitant l'établissement d'un puits latéral (61) dont la taille est sensiblement égale à celle du sondage (3) existant.
PCT/US2001/041914 2000-08-28 2001-08-28 Procede ameliore de forage de puits multilateraux et dispositif correspondant Ceased WO2002018738A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001287211A AU2001287211A1 (en) 2000-08-28 2001-08-28 Improved method for drilling multi-lateral wells and related device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US64933200A 2000-08-28 2000-08-28
US09/649,332 2000-08-28

Publications (1)

Publication Number Publication Date
WO2002018738A1 true WO2002018738A1 (fr) 2002-03-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/041914 Ceased WO2002018738A1 (fr) 2000-08-28 2001-08-28 Procede ameliore de forage de puits multilateraux et dispositif correspondant

Country Status (3)

Country Link
US (1) US20020023754A1 (fr)
AU (1) AU2001287211A1 (fr)
WO (1) WO2002018738A1 (fr)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004007898A1 (fr) * 2002-07-12 2004-01-22 Cdx Gas, L.L.C. Systeme de bouchon pour puits de forage et procede correspondant
US6848508B2 (en) 2001-10-30 2005-02-01 Cdx Gas, Llc Slant entry well system and method
US6942030B2 (en) 2002-09-12 2005-09-13 Cdx Gas, Llc Three-dimensional well system for accessing subterranean zones
US6964298B2 (en) 1998-11-20 2005-11-15 Cdx Gas, Llc Method and system for accessing subterranean deposits from the surface
US6964308B1 (en) 2002-10-08 2005-11-15 Cdx Gas, Llc Method of drilling lateral wellbores from a slant well without utilizing a whipstock
US6976533B2 (en) 1998-11-20 2005-12-20 Cdx Gas, Llc Method and system for accessing subterranean deposits from the surface
US6986388B2 (en) 2001-01-30 2006-01-17 Cdx Gas, Llc Method and system for accessing a subterranean zone from a limited surface area
US6988548B2 (en) 2002-10-03 2006-01-24 Cdx Gas, Llc Method and system for removing fluid from a subterranean zone using an enlarged cavity
US6991047B2 (en) 2002-07-12 2006-01-31 Cdx Gas, Llc Wellbore sealing system and method
US7025154B2 (en) 1998-11-20 2006-04-11 Cdx Gas, Llc Method and system for circulating fluid in a well system
US7073595B2 (en) 2002-09-12 2006-07-11 Cdx Gas, Llc Method and system for controlling pressure in a dual well system
US7100687B2 (en) 2003-11-17 2006-09-05 Cdx Gas, Llc Multi-purpose well bores and method for accessing a subterranean zone from the surface
US7134494B2 (en) 2003-06-05 2006-11-14 Cdx Gas, Llc Method and system for recirculating fluid in a well system
US7163063B2 (en) 2003-11-26 2007-01-16 Cdx Gas, Llc Method and system for extraction of resources from a subterranean well bore
US7207390B1 (en) 2004-02-05 2007-04-24 Cdx Gas, Llc Method and system for lining multilateral wells
US7207395B2 (en) 2004-01-30 2007-04-24 Cdx Gas, Llc Method and system for testing a partially formed hydrocarbon well for evaluation and well planning refinement
US7222670B2 (en) 2004-02-27 2007-05-29 Cdx Gas, Llc System and method for multiple wells from a common surface location
US7264048B2 (en) 2003-04-21 2007-09-04 Cdx Gas, Llc Slot cavity
US7299864B2 (en) 2004-12-22 2007-11-27 Cdx Gas, Llc Adjustable window liner
US7353877B2 (en) 2004-12-21 2008-04-08 Cdx Gas, Llc Accessing subterranean resources by formation collapse
US7360595B2 (en) 2002-05-08 2008-04-22 Cdx Gas, Llc Method and system for underground treatment of materials
US7373984B2 (en) 2004-12-22 2008-05-20 Cdx Gas, Llc Lining well bore junctions
US7419223B2 (en) 2003-11-26 2008-09-02 Cdx Gas, Llc System and method for enhancing permeability of a subterranean zone at a horizontal well bore
US7571771B2 (en) 2005-05-31 2009-08-11 Cdx Gas, Llc Cavity well system
US8291974B2 (en) 1998-11-20 2012-10-23 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor

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US6840321B2 (en) * 2002-09-24 2005-01-11 Halliburton Energy Services, Inc. Multilateral injection/production/storage completion system
US6863126B2 (en) * 2002-09-24 2005-03-08 Halliburton Energy Services, Inc. Alternate path multilayer production/injection
US6951252B2 (en) * 2002-09-24 2005-10-04 Halliburton Energy Services, Inc. Surface controlled subsurface lateral branch safety valve
WO2004081333A2 (fr) * 2003-03-10 2004-09-23 Exxonmobil Upstream Research Company Procédé et appareil d'excavation dans le fond d'un puits de forage
US7159661B2 (en) * 2003-12-01 2007-01-09 Halliburton Energy Services, Inc. Multilateral completion system utilizing an alternate passage
US8430187B2 (en) * 2009-02-27 2013-04-30 Conocophillips Company Directional sidetrack well drilling system
GB2496789A (en) * 2010-08-04 2013-05-22 Schlumberger Holdings Controllably installed multilateral completions assembly
AU2013377868B2 (en) 2013-02-07 2017-09-14 Dyno Nobel Inc. Systems for delivering explosives and methods related thereto
NO336038B1 (no) * 2013-08-16 2015-04-27 Hydra Systems As Fremgangsmåte for etablering av en ny brønnbane fra en eksisterende brønn
NO339191B1 (no) 2013-09-06 2016-11-14 Hydra Systems As Fremgangsmåte for isolering av en permeabel sone i en underjordisk brønn
GB2518612B (en) * 2013-09-25 2020-07-15 Equinor Energy As Method of sealing a well
CA2884979C (fr) 2015-03-02 2017-07-25 Allan Albertson Systeme et procede de puits multilateraux
CN108373297A (zh) * 2018-02-01 2018-08-07 长江大学 一种防窜固井树脂水泥浆及其应用
US11118405B2 (en) * 2019-12-04 2021-09-14 Baker Hughes Oilfield Operations Llc Eccentric dual string exit module
AU2021308217A1 (en) 2020-07-15 2023-02-23 Conocophillips Company Well collapse reconnect system
CN115126413B (zh) * 2021-03-24 2025-03-18 中国石油化工股份有限公司 一种小井眼转向降阻器及其使用方法
CN114252381B (zh) * 2021-12-21 2023-09-22 西南石油大学 一种裂缝性储层水平井钻井液固相污染后污染程度评价方法
US12378842B1 (en) * 2024-02-02 2025-08-05 Chevron U.S.A. Inc. Expandable polymer grout for sealing subterranean formations

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Cited By (41)

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US8316966B2 (en) 1998-11-20 2012-11-27 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
US8434568B2 (en) 1998-11-20 2013-05-07 Vitruvian Exploration, Llc Method and system for circulating fluid in a well system
US9551209B2 (en) 1998-11-20 2017-01-24 Effective Exploration, LLC System and method for accessing subterranean deposits
US6964298B2 (en) 1998-11-20 2005-11-15 Cdx Gas, Llc Method and system for accessing subterranean deposits from the surface
US8813840B2 (en) 1998-11-20 2014-08-26 Efective Exploration, LLC Method and system for accessing subterranean deposits from the surface and tools therefor
US6976533B2 (en) 1998-11-20 2005-12-20 Cdx Gas, Llc Method and system for accessing subterranean deposits from the surface
US8291974B2 (en) 1998-11-20 2012-10-23 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
US8511372B2 (en) 1998-11-20 2013-08-20 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface
US8297350B2 (en) 1998-11-20 2012-10-30 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface
US8371399B2 (en) 1998-11-20 2013-02-12 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
US7025154B2 (en) 1998-11-20 2006-04-11 Cdx Gas, Llc Method and system for circulating fluid in a well system
US8505620B2 (en) 1998-11-20 2013-08-13 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
US8376039B2 (en) 1998-11-20 2013-02-19 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
US8479812B2 (en) 1998-11-20 2013-07-09 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
US8469119B2 (en) 1998-11-20 2013-06-25 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
US8464784B2 (en) 1998-11-20 2013-06-18 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
US6986388B2 (en) 2001-01-30 2006-01-17 Cdx Gas, Llc Method and system for accessing a subterranean zone from a limited surface area
US7048049B2 (en) 2001-10-30 2006-05-23 Cdx Gas, Llc Slant entry well system and method
US6848508B2 (en) 2001-10-30 2005-02-01 Cdx Gas, Llc Slant entry well system and method
US7360595B2 (en) 2002-05-08 2008-04-22 Cdx Gas, Llc Method and system for underground treatment of materials
US6991048B2 (en) 2002-07-12 2006-01-31 Cdx Gas, Llc Wellbore plug system and method
WO2004007898A1 (fr) * 2002-07-12 2004-01-22 Cdx Gas, L.L.C. Systeme de bouchon pour puits de forage et procede correspondant
US6991047B2 (en) 2002-07-12 2006-01-31 Cdx Gas, Llc Wellbore sealing system and method
US7025137B2 (en) 2002-09-12 2006-04-11 Cdx Gas, Llc Three-dimensional well system for accessing subterranean zones
US6942030B2 (en) 2002-09-12 2005-09-13 Cdx Gas, Llc Three-dimensional well system for accessing subterranean zones
US7073595B2 (en) 2002-09-12 2006-07-11 Cdx Gas, Llc Method and system for controlling pressure in a dual well system
US7090009B2 (en) 2002-09-12 2006-08-15 Cdx Gas, Llc Three-dimensional well system for accessing subterranean zones
US6988548B2 (en) 2002-10-03 2006-01-24 Cdx Gas, Llc Method and system for removing fluid from a subterranean zone using an enlarged cavity
US6964308B1 (en) 2002-10-08 2005-11-15 Cdx Gas, Llc Method of drilling lateral wellbores from a slant well without utilizing a whipstock
US7264048B2 (en) 2003-04-21 2007-09-04 Cdx Gas, Llc Slot cavity
US7134494B2 (en) 2003-06-05 2006-11-14 Cdx Gas, Llc Method and system for recirculating fluid in a well system
US7100687B2 (en) 2003-11-17 2006-09-05 Cdx Gas, Llc Multi-purpose well bores and method for accessing a subterranean zone from the surface
US7163063B2 (en) 2003-11-26 2007-01-16 Cdx Gas, Llc Method and system for extraction of resources from a subterranean well bore
US7419223B2 (en) 2003-11-26 2008-09-02 Cdx Gas, Llc System and method for enhancing permeability of a subterranean zone at a horizontal well bore
US7207395B2 (en) 2004-01-30 2007-04-24 Cdx Gas, Llc Method and system for testing a partially formed hydrocarbon well for evaluation and well planning refinement
US7207390B1 (en) 2004-02-05 2007-04-24 Cdx Gas, Llc Method and system for lining multilateral wells
US7222670B2 (en) 2004-02-27 2007-05-29 Cdx Gas, Llc System and method for multiple wells from a common surface location
US7353877B2 (en) 2004-12-21 2008-04-08 Cdx Gas, Llc Accessing subterranean resources by formation collapse
US7299864B2 (en) 2004-12-22 2007-11-27 Cdx Gas, Llc Adjustable window liner
US7373984B2 (en) 2004-12-22 2008-05-20 Cdx Gas, Llc Lining well bore junctions
US7571771B2 (en) 2005-05-31 2009-08-11 Cdx Gas, Llc Cavity well system

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