EP0447204A2 - Inflatable packer with inflatable packing element for use in subterranean wells - Google Patents
Inflatable packer with inflatable packing element for use in subterranean wells Download PDFInfo
- Publication number
- EP0447204A2 EP0447204A2 EP91302105A EP91302105A EP0447204A2 EP 0447204 A2 EP0447204 A2 EP 0447204A2 EP 91302105 A EP91302105 A EP 91302105A EP 91302105 A EP91302105 A EP 91302105A EP 0447204 A2 EP0447204 A2 EP 0447204A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- sleeve
- ribs
- shoulder
- elastomeric body
- tubular
- 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.)
- Granted
Links
- 238000012856 packing Methods 0.000 title claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 16
- 239000012530 fluid Substances 0.000 claims description 10
- 239000013536 elastomeric material Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims 2
- 238000010276 construction Methods 0.000 description 6
- 238000003466 welding Methods 0.000 description 5
- 210000000038 chest Anatomy 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
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
- E21B33/127—Packers; Plugs with inflatable sleeve
- E21B33/1277—Packers; Plugs with inflatable sleeve characterised by the construction or fixation of the sleeve
Definitions
- the invention relates to the construction of an inflatable pacing element for use in inflatable packers or bridge plugs employed in subterranean wells.
- Inflatable packers have long been utilized in subterranean wells.
- Such inflatable tools normally comprise an elastomeric sleeve element mounted in surrounding relationship to a tubular body portion. Pressured fluid is communicated from the surface of the well to the bore of the tubular body and then through radial passages to the interior of the elastomeric sleeve.
- To protect the elastomeric sleeve it is customary to completely surround the elastomeric sleeve with a plurality of peripherally overlapping, resilient, reinforcing slats or ribs.
- the medial portions of the reinforcing ribs are surrounded by and may be bonded to an outer annular elastomeric packing element or cover of substantial wall thickness.
- Upper and lower securing assemblies respectively engage the ends of the elastomeric sleeve and the reinforcing ribs and is fixedly and sealably secured relative to a central tubular body.
- a lower securing assembly is secured to a sealing sub which is mounted for slidable and sealable movement on the exterior of the central tubular body, in response to the inflation forces.
- U.S. patent number 3,160,211 to MALONE A structure of this general type is shown in U.S. patent number 3,160,211 to MALONE.
- the ends of the cylindrical cage of peripherally overlapped slats or ribs surrounding an inflatable elastomeric sleeve of an inflatable packing element are respectively welded to an external surface of a force transmitting sleeve.
- Such force transmitting sleeve is further provided with an external shoulder which is disposed in abutting relationship with an internal shoulder provided on the respective mounting sleeve for securing the entire inflatable assemblage to the body of the inflatable packer or bridge plug.
- the location of the abutting shoulders is deliberately selected so as to provide an axial length of the circumferential array of resilient slats or ribs in frictional contact with the internal bore of the mounting sleeve.
- Fig. 1 is a combination perspective and sectional view illustrating a prior art method of welding the ends of the reinforcing ribs to the mounting sleeve of an inflatable packer.
- Fig. 2 is a vertical quarter sectional view of the mounting sleeve portion of an inflatable packer wherein the reinforcing ribs are secured by utilization of the construction of this invention.
- Fig. 3 is a view similar to Fig. 2 but illustrating the effects of application of inflation pressures to the elastomeric sleeve of the mounting construction of Fig. 1.
- Fig. 4 is an enlarged scale sectional view taken on the plane 4-4 of Fig. 2.
- FIG. 1 a prior art construction for securing the reinforcing ribs of an inflatable element for an inflatable packer or bridge plug is shown.
- the ends of each ribs is welded to an interior surface of a mounting sleeve.
- a sleeve of elastomeric material (not shown) is inserted within the rib cage and the end secured in conventional fashion. It should be noted, however, that the welding has to be accomplished in a small internal bore surface and this is recognized to be a difficult procedure to consistently produce good welds for each of the multitude of reinforcing ribs.
- FIG. 2 only the upper securing portion of the inflatable element of an inflatable packer or bridge plug is shown. All other elements of the inflatable packer or bridge plug, including the valving apparatus for supplying inflation pressures are well known in the art. See for example, U.S. Patent No. 4,832,120; U.S. Patent No. 4,708,208; and U.S. Patent No. 4,805,699, and the disclosures of such patents are hereby incorporated by reference.
- Inflatable element 10 comprises a cylindrical cage of peripherally overlapping flexible metal slats or ribs 12, the configuration of which is best shown in the enlarged sectional view of Fig. 4.
- the ends 12a of such ribs are welded to a force transmitting sleeve or end ring 14 by a weld W which is accomplished after the insertion of the ribs through a mounting sleeve or anchor sleeve 20.
- the force transmitting sleeve 14 is provided with an external shoulder 14a which cooperates with an internal shoulder 20a provided on a medial portion of mounting sleeve 20 for transmitting tensile forces exerted on the ribs 12 to the mounting sleeve 20.
- An inflatable tube or sleeve 30 of elastomeric material is inserted within the bore of the rib cage 12 and passes through the bore 14b of the force transmitting sleeve 14.
- a tube retainer 11 is installed inside the mounting sleeve or anchor sleeve 20, radially forcing the inflatable tube or sleeve 30 of elastomeric material to extrude and engage in appropriate circumferential grooves 20c formed in mounting sleeve 20.
- Anchor body 1 is provided with external threads 1b for threadably engaging the upper end of the mounting sleeve 20. Such threads are sealed by an 0-ring 1e.
- a cover portion 35 of elastomeric material is bonded to the medial portions of the rib cage 12 to provide a sealing contact with the bore of a well or well conduit, as is customary.
- the internal surface of anchor body 1 cooperates with an internal body tube 2 to define an annular passage 1c and radial ports 1d for application of fluid pressure to the interior of the elastomeric sleeve 30.
- the application and maintenance of fluid pressure on the interior of the elastomeric sleeve 30 is accomplished in a manner well known in the art and fully disclosed in the aforementioned patents, hence further description is deemed unnecessary.
- the inflatable packing element 10 is expanded to assume the configuration illustrated in Fig. 3.
- the tensile forces developed in the ribs 12 by such expansion are transmitted by the welds W to the force transmitting sleeve or end ring 14 and by the peripheral shoulder 14a to the mounting sleeve 20 and the anchor body 1.
- the location of the force transmitting sleeve 14 relative to the length of the mounting sleeve 20 is an important feature of this invention.
- the force transmitting sleeve is preferably located above the central or medial portion of the mounting sleeve 20 so that a substantial length of the ribs 12 are disposed in frictional engagement with the bore 20b of the mounting sleeve 20. These frictional forces are substantially increased by the fluid pressure forces illustrated by the arrows shown in Fig. 3 and result from the application of the inflation pressure.
- the aforedescribed construction resolves a troublesome constructural defect of inflatable packers or bridge plugs through not only the substantial elimination of welding defects caused by performing rib welds in an internal bore, but also significantly reduces the tensile forces applied to the welds through the utilization of an extended longitudinal bore area of the mounting sleeve in frictional contact with the reinforcing ribs 12 when such ribs are expanded by inflation pressure.
Landscapes
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Piles And Underground Anchors (AREA)
- Materials For Medical Uses (AREA)
- Earth Drilling (AREA)
- Packages (AREA)
- Buffer Packaging (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
Description
- The invention relates to the construction of an inflatable pacing element for use in inflatable packers or bridge plugs employed in subterranean wells.
- Inflatable packers (or bridge plugs) have long been utilized in subterranean wells. Such inflatable tools normally comprise an elastomeric sleeve element mounted in surrounding relationship to a tubular body portion. Pressured fluid is communicated from the surface of the well to the bore of the tubular body and then through radial passages to the interior of the elastomeric sleeve. To protect the elastomeric sleeve, it is customary to completely surround the elastomeric sleeve with a plurality of peripherally overlapping, resilient, reinforcing slats or ribs. The medial portions of the reinforcing ribs are surrounded by and may be bonded to an outer annular elastomeric packing element or cover of substantial wall thickness. Upper and lower securing assemblies respectively engage the ends of the elastomeric sleeve and the reinforcing ribs and is fixedly and sealably secured relative to a central tubular body. A lower securing assembly is secured to a sealing sub which is mounted for slidable and sealable movement on the exterior of the central tubular body, in response to the inflation forces. A structure of this general type is shown in U.S. patent number 3,160,211 to MALONE.
- With inflatable packers of this type, very substantial tensile forces are exerted on the reinforcing slats or ribs during the inflation of the elastomeric sleeve. It has been customary to clamp the ends of the ribs to the upper and lower securing assemblies, but such clamping arrangements are subject to failure if the inflatable packer is repeatedly inflated for engagement with different portions of the well casing or conduit in which it is inserted.
- More recently, the ends of the flexible ribs have been welded to an internal surface of a securing sleeve, in the manner indicated in Fig. 1 of the drawings. If the welding operation is properly accomplished, this provides a secure anchoring of the ends of the flexible ribs to the mounting sleeve, but those skilled in the art will recognize the difficulty of making consistently good welds within the relatively small bore of a mounting sleeve for the inflatable packing element of an inflatable packer. If one or more of the ribs is not properly welded, such ribs will break loose under the tensile forces imposed by the inflation of the elastomeric sleeve packer or element which is inserted within the ribs and, because there is thus created a weak area in the cylindrical cage of the reinforcing ribs, the substantial fluid pressure applied to the inflatable elastomeric sleeve can well push such ribs out of alignment with the other ribs and thus produce a potential area of breakage of the inflatable elastomeric sleeve because it will follow the outward displacement of the unanchored rib and form a thin walled bubble.
- There is a need therefore for an anchoring system for the peripherally stacked cage of flexible reinforcing ribs which normally surround the inflatable elastomeric sleeve of an inflatable packer or bridge plug which effects a reliable rigid connection of the ends of the ribs to the mounting sleeves for the expansible packing element.
- In accordance with this invention, the ends of the cylindrical cage of peripherally overlapped slats or ribs surrounding an inflatable elastomeric sleeve of an inflatable packing element are respectively welded to an external surface of a force transmitting sleeve. Such force transmitting sleeve is further provided with an external shoulder which is disposed in abutting relationship with an internal shoulder provided on the respective mounting sleeve for securing the entire inflatable assemblage to the body of the inflatable packer or bridge plug. Additionally, the location of the abutting shoulders is deliberately selected so as to provide an axial length of the circumferential array of resilient slats or ribs in frictional contact with the internal bore of the mounting sleeve. Such frictional forces, which are greatly increased through the application of the inflation pressures to the apparatus, significantly reduce the tensile forces applied to the welds, hence minimizing the opportunity for any individual rib to break at its weld.
- Further advantages of the invention will be readily apparent to those skilled in the art from the following detailed description, taken in conjunction with the annexed sheets of drawings, on which is shown a preferred embodiment of the invention.
- Fig. 1 is a combination perspective and sectional view illustrating a prior art method of welding the ends of the reinforcing ribs to the mounting sleeve of an inflatable packer.
- Fig. 2 is a vertical quarter sectional view of the mounting sleeve portion of an inflatable packer wherein the reinforcing ribs are secured by utilization of the construction of this invention.
- Fig. 3 is a view similar to Fig. 2 but illustrating the effects of application of inflation pressures to the elastomeric sleeve of the mounting construction of Fig. 1.
- Fig. 4 is an enlarged scale sectional view taken on the plane 4-4 of Fig. 2.
- Referring to Fig. 1, a prior art construction for securing the reinforcing ribs of an inflatable element for an inflatable packer or bridge plug is shown. The ends of each ribs is welded to an interior surface of a mounting sleeve. After the welding operation, a sleeve of elastomeric material (not shown) is inserted within the rib cage and the end secured in conventional fashion. It should be noted, however, that the welding has to be accomplished in a small internal bore surface and this is recognized to be a difficult procedure to consistently produce good welds for each of the multitude of reinforcing ribs.
- Referring now to Fig. 2, only the upper securing portion of the inflatable element of an inflatable packer or bridge plug is shown. All other elements of the inflatable packer or bridge plug, including the valving apparatus for supplying inflation pressures are well known in the art. See for example, U.S. Patent No. 4,832,120; U.S. Patent No. 4,708,208; and U.S. Patent No. 4,805,699, and the disclosures of such patents are hereby incorporated by reference.
-
Inflatable element 10 comprises a cylindrical cage of peripherally overlapping flexible metal slats orribs 12, the configuration of which is best shown in the enlarged sectional view of Fig. 4. The ends 12a of such ribs are welded to a force transmitting sleeve orend ring 14 by a weld W which is accomplished after the insertion of the ribs through a mounting sleeve oranchor sleeve 20. Theforce transmitting sleeve 14 is provided with an external shoulder 14a which cooperates with an internal shoulder 20a provided on a medial portion ofmounting sleeve 20 for transmitting tensile forces exerted on theribs 12 to themounting sleeve 20. - An inflatable tube or
sleeve 30 of elastomeric material is inserted within the bore of therib cage 12 and passes through thebore 14b of theforce transmitting sleeve 14. Atube retainer 11 is installed inside the mounting sleeve oranchor sleeve 20, radially forcing the inflatable tube orsleeve 30 of elastomeric material to extrude and engage in appropriatecircumferential grooves 20c formed in mountingsleeve 20. Anchor body 1 is provided withexternal threads 1b for threadably engaging the upper end of themounting sleeve 20. Such threads are sealed by an 0-ring 1e. - A
cover portion 35 of elastomeric material is bonded to the medial portions of therib cage 12 to provide a sealing contact with the bore of a well or well conduit, as is customary. - As is customary in inflatable packers, the internal surface of anchor body 1 cooperates with an
internal body tube 2 to define anannular passage 1c andradial ports 1d for application of fluid pressure to the interior of theelastomeric sleeve 30. The application and maintenance of fluid pressure on the interior of theelastomeric sleeve 30 is accomplished in a manner well known in the art and fully disclosed in the aforementioned patents, hence further description is deemed unnecessary. Thus, when such fluid pressure is applied through thefluid passage 1c, theinflatable packing element 10 is expanded to assume the configuration illustrated in Fig. 3. The tensile forces developed in theribs 12 by such expansion are transmitted by the welds W to the force transmitting sleeve orend ring 14 and by the peripheral shoulder 14a to themounting sleeve 20 and the anchor body 1. - As best shown in Fig. 3, the location of the
force transmitting sleeve 14 relative to the length of themounting sleeve 20 is an important feature of this invention. The force transmitting sleeve is preferably located above the central or medial portion of themounting sleeve 20 so that a substantial length of theribs 12 are disposed in frictional engagement with thebore 20b of themounting sleeve 20. These frictional forces are substantially increased by the fluid pressure forces illustrated by the arrows shown in Fig. 3 and result from the application of the inflation pressure. - It will be therefore be readily apparent to those skilled in the art that a very substantial frictional force may be developed to resist the tensile forces exerted on the reinforcing
ribs 12 by the inflation of theelastomeric sleeve 30. Such frictional forces substantially diminish the tensile forces exerted on the welds W and thus provide further insurance against the separation of any of the welds W. - While only the mounting structure for one end of the
inflatable packing element 10 has been shown, those skilled in the art will recognize that the other end of the element is of identical construction. Thus, the other ends of the reinforcingribs 12 are secured by external welds W to a force transmitting sleeve which is identical to sleeve orring 14 except that it will be disposed in a vertically reversed relationship. - The aforedescribed construction resolves a troublesome constructural defect of inflatable packers or bridge plugs through not only the substantial elimination of welding defects caused by performing rib welds in an internal bore, but also significantly reduces the tensile forces applied to the welds through the utilization of an extended longitudinal bore area of the mounting sleeve in frictional contact with the reinforcing
ribs 12 when such ribs are expanded by inflation pressure. - Although the invention has been described in terms of specified embodiments which are set forth in detail, it should be understood that this is by illustration only and that the invention is not necessarily limited thereto, since alternative embodiments and operating techniques will become apparent to those skilled in the art in view of the disclosure. Accordingly, modifications are contemplated which can be made without departing from the spirit of the described invention.
Claims (7)
- An inflatable packing element (10) for use in a subterranean well comprising:
a tubular elastomeric body (30);
a plurality of elongated, peripherally adjacent, flexible metal ribs (12) snugly surrounding at least the medial portion of said tubular elastomeric body (30);
a force transmitting sleeve (14) externally welded to at least one end of each said metal ribs (12) and defining an external load transmitting shoulder (14a); and
a mounting sleeve (20) for said force transmitting sleeve (14) defining an internal shoulder (20a) abuttable with said force transmitting external shoulder (14a) of said force transmitting sleeve (14), thereby transmitting to said mounting sleeve (20) the tensile forces produced in said ribs (12) by fluid pressure expansion of said tubular elastomeric body (30). - The apparatus of Claim 1 wherein said internal shoulder (20a) is disposed in a medial location in the mounting sleeve (20), whereby a length of the ends of said ribs (12) is moved by expansion of said tubular elastomeric body (30) into frictional engagement with the bore of said mounting sleeve (20), thereby absorbing a portion of said tensile forces.
- An inflatable packing element (10) for use in a subterranean well comprising:
a tubular elastomeric body (30);
a plurality of elongated, peripherally adjacent, flexible metal ribs (12) snugly surrounding at least the medial portion of said tubular elastomeric body (30);
a load transmitting means (14) externally welded to each end of said metal ribs (12) and defining an external load transmitting shoulder (14a); and
an anchor sleeve (20) for each said load transmitting means (14), said anchor sleeve (20) defining an internal shoulder (20a) abuttable with the respective load transmitting external shoulder (14a) of said load transmitting means (14), thereby transmitting to said anchor sleeve (20) the tensile forces produced in said ribs (12) by fluid pressure expansion of said tubular elastomeric body (30). - The apparatus of Claim 3 wherein said internal annular shoulder (20) is respectively disposed in a medial location in the anchor sleeve (20), whereby a substantial length of the ends of said ribs (12) are respectively expanded by said tubular elastomeric body (30) into frictional engagement with the bores of said anchor sleeve (20), thereby absorbing a portion of said tensile forces.
- An inflatable packing element (10) for use in a subterranean well comprising, in combination:
a pair of tubular bodies (20) having internally projecting annular shoulders (20a);
a pair of end rings (14) formed of a weldable material and respectively insertable in said tubular bodies (20);
a plurality of elongated flexible ribs (12) also formed of a weldable material;
said ribs (12) being disposed in a cylindrical, overlapping array, with each rib (12) having its opposite ends respectively welded to the exterior of said end rings (14);
a sleeve of elastomeric material inserted in said cylindrical array of ribs (12);
an external load carrying shoulder (14a) on each said ring (14); and
said load carrying external shoulders (14a) being respectively sbuttable with said internal shoulders (20a) of said tubular bodies (20) to transmit tension loads imposed on said ribs (12) by inflation of said elastomeric sleeve (30). - The apparatus of Claim 3 wherein said internal annular shoulders (20a) are respectively located in medial portions of said tubular bodies (20) and the end portions of said ribs (12) are respectively frictionally engaged with a substantial portion of the interior surfaces of said tubular bodies (20).
- An inflatable packing element (10) for use in subterranean well, comprising:
a tubular elastomeric body (30);
elongated, peripherally adjacent reinforcing means (12) snugly surrounding at least the medial portion of said tubular elastomeric body (30);
a force transmitting sleeve (14) externally secured to at least one end of said reinforcing means (12) and defining an external load transmitting shoulder (14a); and
mounting means (20) for said load force transmitting sleeve (14), said mounting means (20) defining an internal shoulder (20a) sbuttable with said force transmitting external shoulder (14a) of said force transmitting sleeve (14), thereby transmitting to said mounting means (20) the tensile forces produced by said reinforcing means (12) by fluid pressure expansion of said tubular elastomeric body (30).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US49284190A | 1990-03-13 | 1990-03-13 | |
US492841 | 1990-03-13 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0447204A2 true EP0447204A2 (en) | 1991-09-18 |
EP0447204A3 EP0447204A3 (en) | 1992-03-04 |
EP0447204B1 EP0447204B1 (en) | 1997-07-09 |
Family
ID=23957844
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91302105A Expired - Lifetime EP0447204B1 (en) | 1990-03-13 | 1991-03-13 | Inflatable packer with inflatable packing element for use in subterranean wells |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0447204B1 (en) |
AT (1) | ATE155203T1 (en) |
CA (1) | CA2038105C (en) |
DE (1) | DE69126722D1 (en) |
NO (1) | NO303698B1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6666276B1 (en) * | 2001-10-19 | 2003-12-23 | John M. Yokley | Downhole radial set packer element |
EP3049612A4 (en) * | 2013-09-24 | 2017-10-18 | Halliburton Energy Services, Inc. | Reinforced drill pipe seal with floating backup layer |
CN110042868A (en) * | 2019-05-14 | 2019-07-23 | 中建五局土木工程有限公司 | Anti-jump vehicle inspection shaft and its construction method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4403660A (en) * | 1980-08-08 | 1983-09-13 | Mgc Oil Tools, Inc. | Well packer and method of use thereof |
US4544165A (en) * | 1983-05-16 | 1985-10-01 | Xenpax, Inc. | Inflatable packer |
US4979570A (en) * | 1989-11-28 | 1990-12-25 | Baker Hughes Incorporated | Inflatable tool with rib expansion support |
-
1991
- 1991-03-12 NO NO910983A patent/NO303698B1/en not_active IP Right Cessation
- 1991-03-12 CA CA002038105A patent/CA2038105C/en not_active Expired - Lifetime
- 1991-03-13 AT AT91302105T patent/ATE155203T1/en not_active IP Right Cessation
- 1991-03-13 EP EP91302105A patent/EP0447204B1/en not_active Expired - Lifetime
- 1991-03-13 DE DE69126722T patent/DE69126722D1/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4403660A (en) * | 1980-08-08 | 1983-09-13 | Mgc Oil Tools, Inc. | Well packer and method of use thereof |
US4544165A (en) * | 1983-05-16 | 1985-10-01 | Xenpax, Inc. | Inflatable packer |
US4979570A (en) * | 1989-11-28 | 1990-12-25 | Baker Hughes Incorporated | Inflatable tool with rib expansion support |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6666276B1 (en) * | 2001-10-19 | 2003-12-23 | John M. Yokley | Downhole radial set packer element |
EP3049612A4 (en) * | 2013-09-24 | 2017-10-18 | Halliburton Energy Services, Inc. | Reinforced drill pipe seal with floating backup layer |
US10240422B2 (en) | 2013-09-24 | 2019-03-26 | Halliburton Energy Services, Inc. | Reinforced drill pipe seal with floating backup layer |
CN110042868A (en) * | 2019-05-14 | 2019-07-23 | 中建五局土木工程有限公司 | Anti-jump vehicle inspection shaft and its construction method |
CN110042868B (en) * | 2019-05-14 | 2023-12-29 | 中建五局土木工程有限公司 | Anti-jump inspection well and construction method thereof |
Also Published As
Publication number | Publication date |
---|---|
CA2038105C (en) | 2002-01-08 |
DE69126722D1 (en) | 1997-08-14 |
EP0447204A3 (en) | 1992-03-04 |
ATE155203T1 (en) | 1997-07-15 |
NO303698B1 (en) | 1998-08-17 |
CA2038105A1 (en) | 1991-09-14 |
EP0447204B1 (en) | 1997-07-09 |
NO910983L (en) | 1991-09-16 |
NO910983D0 (en) | 1991-03-12 |
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