EP2133509A1 - Packer und Dichtung für unverrohrte Bohrlöcher - Google Patents

Packer und Dichtung für unverrohrte Bohrlöcher Download PDF

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Publication number
EP2133509A1
EP2133509A1 EP08104394A EP08104394A EP2133509A1 EP 2133509 A1 EP2133509 A1 EP 2133509A1 EP 08104394 A EP08104394 A EP 08104394A EP 08104394 A EP08104394 A EP 08104394A EP 2133509 A1 EP2133509 A1 EP 2133509A1
Authority
EP
European Patent Office
Prior art keywords
seal
sealing
open hole
hole section
sealing element
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.)
Withdrawn
Application number
EP08104394A
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English (en)
French (fr)
Inventor
Tech Holdings Limited Flo
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP08104394A priority Critical patent/EP2133509A1/de
Priority to PCT/GB2009/050654 priority patent/WO2009150461A1/en
Publication of EP2133509A1 publication Critical patent/EP2133509A1/de
Withdrawn legal-status Critical Current

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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
    • E21B33/12—Packers; Plugs
    • E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means

Definitions

  • the present invention relates to the field of open-hole mechanical packers for use in relation to the recovery of fluids such as oil or gas.
  • the packers With oil wells for example, the packers are fitted to, and sealed around, a completion liner and then inserted into the well.
  • Existing mechanical open-hole packer seal technology uses packers formed of a seal of deformable elastomer material. After the completion section is placed in the reservoir, the packers are set against the open-hole section of the reservoir by pressurising a piston seal assembly which serves to drive a mechanism which transversely deforms the packer seal along the direction of the completion liner. Actuating the packer in this manner causes it to deform in a transverse/radial direction forming a seal between the completion liner and the open-hole section of the reservoir.
  • packers prefferably be formed of a material which is arranged to expand, i.e. swell, as a result of contact with, for example, a liquid found in, or in the vicinity of, the reservoir, so that the packer expands to seal the space between the completion liner and the well wall.
  • a material which is arranged to expand i.e. swell
  • US Patent 7143832 One example of such a known arrangement is US Patent 7143832 .
  • the present invention seeks to provide for an open-hole seal arrangement having advantages over known such open-hole seals.
  • a sealing arrangement for open hole sections of reservoirs comprising: a mechanical packer associated with a conduit to be located within the open hole section and arranged to urge a sealing element into engagement with the surface of the hole section, wherein at least part of said sealing element has a capability for expansion due to contact with fluid.
  • a method of sealing open hole sections of reservoirs using the arrangement according to the first aspect of the invention comprising the steps of; inserting said sealing arrangement into said open hole section; urging the sealing element into engagement with the surface of the hole section by means of the mechanical packer, and allowing the sealing element to expand further following contact with fluid.
  • the seal element can further expand to conform to the new shape or dimension of the open-hole.
  • This allows for maintenance of a fluid tight seal between the sealing element and the open-hole walls of a reservoir even after a change in dimensions/configuration of the open hole.
  • This therefore advantageously serves to prevent micro-leaks between the sealing element and open-hole walls of a reservoir which could result in loss of fluid contained in the reservoir.
  • the invention provides for a sealing element for an open hole section of a reservoir, the sealing element being arranged to be deformed by a mechanical packer so as to urged into engagement with the surface of the hole section, and further having at least one part that is capable of expansion upon fluid contact.
  • Fig. 1 shows a schematic of prior art open hole completions 25 and seal elements 22, 24 deployed in a well 21.
  • the mechanical open-hole packers are set by pressuring up a piston seal assembly, which is an integral part of the mechanical packer, which in turn drives a mechanism to deform the seal elements 22, 24 and hence make a seal between the completion liner and the open section of the well 21.
  • An example of a bad seal 24 is shown.
  • FIGs. 2 and 3 there is provided an open hole completion 18 and a mechanical packer 17.
  • a swellable elastomer seal element 3 is disposed around the completion 18 and between the mechanical packer 17 and an abutment 1.
  • the abutment 1 is generally the point where the completion 18 is sealably connected or coupled to the production tubing which allows for recovery of the fluid in the reservoir and further comprises a top sub 2.
  • the completion 18 is formed of a pipe or conduit, and is suitable for being placed in open-holes of fluid reservoirs for recovering fluids such as oil from the reservoir in question.
  • the completion 18 is generally circular in cross-section however, any suitable cross-section can be employed.
  • the seal element 3 is arranged to extend in a transverse/radial direction along a length of the completion and also to provide a radial fit around the circumference of the completion 18.
  • the seal element 3 includes an annular internal surface to provide a fluid tight seal with the completion 18.
  • the annular surface of the seal element 3 can be any appropriate shape determined by the cross-sectional shape of the completion 18.
  • the seal element 3 is formed of a elastomer material such as Hydrogenated Nitrile Butadiene Rubber (HNBR) or Nitrile elastomeric compounds with the presence of swellable elastomer which can be deformed under mechanical load, so that it increases diameter, but is reduced in transverse length whilst maintaining a fluid tight seal with the completion 18.
  • HNBR Hydrogenated Nitrile Butadiene Rubber
  • Nitrile elastomeric compounds with the presence of swellable elastomer which can be deformed under mechanical load, so that it increases diameter, but is reduced in transverse length whilst maintaining a fluid tight seal with the completion 18.
  • a further requirement of the elastomer material is that it increases in volume or swells in the presence of fluids such as oil gas or water which would be normally present in the reservoir, but whilst maintaining a fluid tight seal with the completion 18.
  • the mechanical packer arrangement 17 is arranged to deform the seal element.
  • the packer 17 is arranged to receive the completion 18, such that the packer 17 can travel in a transverse direction along the length of completion 18, towards or away from the abutment 1.
  • the packer 17 has a cross-sectional dimension to substantially match the cross-sectional dimensions of the seal element 3, thereby allowing the seal element 3 to be deformed against the abutment 1 under mechanical pressure applied by the packer 17.
  • the packer assembly further comprises a piston element 4, which is arranged to deform the seal element 3. The piston will drive the seal element in a deformed fashion using applied pressure from the inside.
  • the arrangement in an un-deformed state is shown in the upper half (above line x-x) of Fig.3 .
  • O ring seals 5, 6 are provided on the piston element 4. Also provided is a piston insert 7, a retainer ring 8, a cylinder 9, a lock ring 10, a garter spring 11, shear pins 12, a snap ring 13, a guide 14 and a mandrel 15.
  • the completion 18, seal element 3 and mechanical packer 17 as described above, are inserted or run-in to an open-hole of the reservoir prior to removal of the fluid therefrom.
  • the mechanical packer 17 is pressured-up using a piston seal assembly, so that it is urged to travel along the completion 18 towards the abutment 1.
  • the seal element 3 is transversely loaded so that it deformably expands in a radial direction, to meet the walls of the open-hole 16, as shown in the lower half (below line x-x) of Fig.3 .
  • the fluid tight seal between the seal element 3 and the completion 18 is maintained.
  • Deformation of the seal element 3 can continue until an adequate fluid tight seal is formed between the seal element 3 and the walls of the open-hole, and deformation of the seal element 3 is complete when it forms a fluid tight seal with the walls of the open-hole 16. Compression of the seal is continued until the seal element is fully packed off, that is compressed, against the wall of the open hole formation.
  • the seal element can also undergo further expansive deformation against the walls 16 of the reservoir. Once the mechanical deformation has taken place, further expansive deformation is caused by the presence of fluids in the reservoir which results in an increase in volume of the seal element 3, whilst maintaining a fluid tight seal with the completion 18. This process of expansive deformation results from of chemical absorption of the fluid in the reservoir in the seal element 3.
  • the walls 16 of the open hole prevent the seal element 3 from undergoing further expansion, and the seal element is said to have redundancy in its ability to expand.
  • the seal element 3 can undergo further expansion so as to maintain the fluid tight seal between the seal element 3 and the walls 16 of the open-hole.

Landscapes

  • 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)
  • Sealing Devices (AREA)
EP08104394A 2008-06-12 2008-06-12 Packer und Dichtung für unverrohrte Bohrlöcher Withdrawn EP2133509A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP08104394A EP2133509A1 (de) 2008-06-12 2008-06-12 Packer und Dichtung für unverrohrte Bohrlöcher
PCT/GB2009/050654 WO2009150461A1 (en) 2008-06-12 2009-06-10 Hole packer and seal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08104394A EP2133509A1 (de) 2008-06-12 2008-06-12 Packer und Dichtung für unverrohrte Bohrlöcher

Publications (1)

Publication Number Publication Date
EP2133509A1 true EP2133509A1 (de) 2009-12-16

Family

ID=39870324

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08104394A Withdrawn EP2133509A1 (de) 2008-06-12 2008-06-12 Packer und Dichtung für unverrohrte Bohrlöcher

Country Status (2)

Country Link
EP (1) EP2133509A1 (de)
WO (1) WO2009150461A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2469553A (en) * 2009-04-17 2010-10-20 Swellfix Bv A swelling seal comprising a swellable material which swells upon exposure to an activator medium
EP2407632A3 (de) * 2010-07-13 2013-08-14 Weatherford/Lamb, Inc. Bohrlochpacker mit quellfähiger Hülse
US8833473B2 (en) 2007-08-25 2014-09-16 Swellfix B.V. Sealing assembly

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108952619B (zh) * 2018-09-18 2023-07-07 中国石油天然气集团有限公司 机械坐封式防砂尾管顶部封隔器
CN113123753A (zh) * 2019-12-31 2021-07-16 中国石油化工股份有限公司 一种可溶易钻裸眼封隔器及其使用方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2406593A (en) * 2003-10-03 2005-04-06 Schlumberger Holdings Well packer having an energized sealing element and associated method
US7143832B2 (en) 2000-09-08 2006-12-05 Halliburton Energy Services, Inc. Well packing
US20070114016A1 (en) * 2002-09-23 2007-05-24 Halliburton Energy Services, Inc. Annular Isolators for Expandable Tubulars in Wellbores

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7143832B2 (en) 2000-09-08 2006-12-05 Halliburton Energy Services, Inc. Well packing
US20070114016A1 (en) * 2002-09-23 2007-05-24 Halliburton Energy Services, Inc. Annular Isolators for Expandable Tubulars in Wellbores
GB2406593A (en) * 2003-10-03 2005-04-06 Schlumberger Holdings Well packer having an energized sealing element and associated method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8833473B2 (en) 2007-08-25 2014-09-16 Swellfix B.V. Sealing assembly
US9732578B2 (en) 2007-08-25 2017-08-15 Swellfix B.V. Downhole sealing assembly with swellable seal
GB2469553A (en) * 2009-04-17 2010-10-20 Swellfix Bv A swelling seal comprising a swellable material which swells upon exposure to an activator medium
GB2469553B (en) * 2009-04-17 2016-01-13 Swellfix Bv Swelling seal
EP2407632A3 (de) * 2010-07-13 2013-08-14 Weatherford/Lamb, Inc. Bohrlochpacker mit quellfähiger Hülse

Also Published As

Publication number Publication date
WO2009150461A1 (en) 2009-12-17

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