WO2022106848A1 - Single trip annular seal repair method and associated equipment - Google Patents
Single trip annular seal repair method and associated equipment Download PDFInfo
- Publication number
- WO2022106848A1 WO2022106848A1 PCT/GB2021/053017 GB2021053017W WO2022106848A1 WO 2022106848 A1 WO2022106848 A1 WO 2022106848A1 GB 2021053017 W GB2021053017 W GB 2021053017W WO 2022106848 A1 WO2022106848 A1 WO 2022106848A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- deflector
- assembly
- alloy
- annular seal
- tubular body
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 61
- 230000008439 repair process Effects 0.000 title claims abstract description 57
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 164
- 239000000956 alloy Substances 0.000 claims abstract description 164
- 239000011324 bead Substances 0.000 claims abstract description 118
- 239000004568 cement Substances 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims description 61
- 239000000463 material Substances 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 14
- 230000007246 mechanism Effects 0.000 claims description 11
- 230000008018 melting Effects 0.000 claims description 11
- 238000002844 melting Methods 0.000 claims description 11
- 238000013019 agitation Methods 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 229910000743 fusible alloy Inorganic materials 0.000 claims description 6
- 229910052797 bismuth Inorganic materials 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 3
- 150000001621 bismuth Chemical class 0.000 claims 1
- 238000013459 approach Methods 0.000 description 11
- 239000000306 component Substances 0.000 description 8
- 238000005755 formation reaction Methods 0.000 description 8
- 239000003832 thermite Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000008358 core component Substances 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910001152 Bi alloy Inorganic materials 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000006023 eutectic alloy Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 238000007711 solidification 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
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- 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
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/02—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground by explosives or by thermal or chemical means
-
- 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
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/08—Fishing for or freeing objects in boreholes or wells using junk baskets or the like
-
- 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
- E21B33/128—Packers; Plugs with a member expanded radially by axial pressure
-
- 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
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/008—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones using chemical heat generating means
-
- 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
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
Definitions
- the present invention relates to the technical field of downhole operations in oil/gas wellbores, and in particular to remedial operations associated with repairing faults in annular seals, such as annular packers and cement seals, found within oil/gas wellbores.
- Additional tubing in the form of well lining or well casing, may also be deployed in locations where the underground formation is unstable and needs to be held back to maintain the integrity of the oil/gas well.
- the present invention seeks to provide an alternative approach to repairing leaks that may have developed in an existing annular seal that is located in an annular space encircling a tubular body within an oil/gas wellbore.
- Typical annular seals include cement seals and annular packers.
- ‘down-hole’ denotes that the first element is further away from the surface of the wellbore than the second element (i.e. the second element is located between the surface and the first element).
- the method employs a deflector that is also delivered downhole via the tubular body to a location that is down-hole of said one or more openings.
- the positioning and configuration of the deflector is such that when the alloy beads are deployed within the tubular body they contact the deflector and are redirected radially outwards towards said one or more openings and out into the annulus, wherein the alloy beads accumulate on top of the up-hole face of the annular seal.
- a heating tool which is also deployed downhole via the tubular body, is operated to increase the temperature within the target region to a level that is sufficient to melt the alloy beads. Following the operation of the heating tool the molten alloy is allowed to cool, wherein the alloy solidifies within the annulus as an alloy plug that effectively repairs any leaks within the annular seal.
- the method of the present invention is considered particularly suitable for use in a single trip annular seal repair. That is to say, the various stages of the repair method can be achieved using a single annular seal repair assembly that is deployed downhole via the tubular body only once.
- the heating tool comprises multiple heaters that are operated independently to provide heat at different times. This use of multiple, independently controllable heaters provides the operator with much greater control of the heating levels within the downhole target region.
- annular seal repair tool assembly that combines all of the main tools required to carry out the main steps of the repair method facilitates the formation of an alloy plug within the annulus in a single trip.
- Achieving the deployment of an alloy plug using a single combined assembly has the potential to speed up the repair process by avoiding the need for deploying and retrieving a different tool for each step of the method.
- the single trip approach thereby offers cost efficiencies as a result of the quicker repair times and the need for fewer downhole tool deployments.
- the common delivery support used to deploy the annular seal repair tool downhole may be selected from: coiled tubing, pipe, slick line and wireline.
- the delivery of the alloy beads may be achieved by dumping the alloy beads into the wellbore tubular body from a location above-ground at the surface of the wellbore.
- This approach has the benefit of being relatively low cost, because the alloy beads are simply dropped into the innermost tubular body.
- the delivery of the alloy beads may be achieved by a dump bailer deployed downhole via the tubular body, said dump bailer forming part of the annular seal repair tool assembly.
- This approach has the benefit of providing a more controlled deployment of the alloy beads onto the deflector.
- the delivery of the alloy beads may be achieved via the coiled tubing or pipe that is used to deploy the annular seal repair tool assembly downhole.
- this approach provides a more controlled deployment of the alloy beads onto the deflector.
- the method of the present invention makes use of pre-existing openings in the well bore tubular body to facilitate the passage of the alloy beads from within the tubular body to the surrounding annulus.
- the downhole target region may be agitated in order to assist the passage of the alloy beads through said one or more openings into the annulus.
- the deflector will also act to reduce the flow of heating fluids upwards within the tubular body and in so doing reduce the amount of heat being lost from the downhole target region. Reducing heat loss in this way also helps to make more efficient use of the heating tool.
- the deflector may comprise insulating means configured to restrict the passage of conducted heat through the deflector.
- the deflector not only acts to reduce the amount of heat lost as a result of heated fluids rising within the tubular body, but is also prevents heat being transferred across the deflector via a process of conduction.
- the deflector may be deployed downhole in an unexpanded or partially expanded state and then expanded towards the tubular body wall in the downhole target region so as to increase the extent to which the deflector redirects the alloy beads. It is appreciated that expanding the deflector in this way will also further restrict the upward flow of heating fluids within the wellbore.
- the heating tool comprises one or more chemical reaction heaters.
- the chemical reaction heaters preferably employ thermite or thermite based mixes for the generation of heat that is suitable to melt the alloy beads.
- the alloy beads are provided in the form of a low melting alloy that has melting point of less than 300°C.
- These low melting alloys are sometimes also referred to as fusible alloys.
- the alloy beads may be provided in the form of bismuth based alloys. It is envisioned that the bismuth based alloys may be eutectic or non-eutectic in nature and may also qualify as low melting alloys.
- the present invention provides a downhole annular seal repair tool assembly for use in forming an alloy plug on an existing annular seal that substantially encircles an oil/gas wellbore tubular body, said assembly comprising: a delivery support connection point, by which the assembly is connectable to delivery means via a delivery support such that the assembly can be delivered to and retrieved from a downhole target region of the wellbore via the tubular body; a heating tool having at least one heater, said heating tool configured to increase the temperature within the downhole target region to temperature that is sufficient to melt alloy beads accumulated within the annulus so as to enable the formation of the alloy plug on the existing annular seal; and a deflector arranged up-hole of said heating tool, wherein the deflector is configured to obstruct alloy beads delivered downhole and redirect them radially outwards towards the walls of the wellbore tubular
- the deflector comprises an up-hole facing surface that comprises at least one sloped region.
- the alloy beads hit the deflector they are re-directed radially outwards towards the wall of the tubular body in which said one or more openings are located.
- the up-hole facing surface of the deflector is cone-shaped or domed. Further, the apex of the cone or the dome is preferably located on a central axis running through the deflector.
- the assembly may further comprise an agitation mechanism configured to agitate and/or vibrate the downhole target region of the wellbore.
- an agitation mechanism configured to agitate and/or vibrate the downhole target region of the wellbore.
- agitating the downhole target region helps to prevent the alloy beads from becoming jammed in said one or more openings in the tubular body wall, which would otherwise prevent the alloy beads from passing through into the annulus.
- the deflector may be configured to be expandable radially outwards towards the tubular body wall. In this way the deflector can be delivered downhole in a smaller form and then, once in position, increased in size to make it more effective at re-directing the alloy beads.
- the mechanism by which the expansion of the deflector is achieved is selected from hydraulic means, pneumatic means, mechanical means and combinations thereof.
- the deflector may preferably be urged to expand and/or contract by way of one or more resilient biasing means. Further preferably the deflector may comprise a canopy of flexible material connected to an umbrella spring mechanism.
- the deflector may comprise insulating means configured to restrict the passage of conducted heat through the deflector.
- insulating means configured to restrict the passage of conducted heat through the deflector.
- the assembly may further comprise a delivery support selected from: coiled tubing, pipe, slick line and wireline.
- a delivery support selected from: coiled tubing, pipe, slick line and wireline.
- the delivery support is either coiled tubing or pipe
- such delivery supports are configured to deliver alloy beads to the downhole target region of the wellbore.
- the alloy beads can be delivered onto the deflector via the same coiled tubing/pipe that is used to deploy the deflector and the heating tool.
- the assembly may further comprise alloy bead delivery means in the form of a dump bailer arranged up-hole of the deflector and said heating tool. In this way the alloy beads can be delivered downhole on-board the assembly and then, once the deflector is in position adjacent to said one or more openings in the wall of the tubular body, released onto the deflector.
- alloy beads may also be simply dumped onto the deflector from a location at the surface of the wellbore. In such situations neither the dump bailer nor the specific delivery supports are essential.
- tubular body wall does not include suitable openings to facilitate the passage of the alloy beads out of the tubular body into the annulus, it is envisioned that it will be necessary to form openings in the wall of the tubular body before the alloy beads are deployed.
- assembly of the present invention preferably further comprises hole making equipment configured to form one or more opening in the walls of the wellbore tubular body.
- the hole making equipment is preferably selected from: a drill, a mechanical punch, a perforating gun, a saw or any other suitable cutting tools such as chemical cutters and fluid jet cutters.
- the assembly may further comprise a junk basket positioned at a leading end of the assembly.
- a junk basket positioned at a leading end of the assembly.
- the junk basket is considered particularly useful for catching any alloy beads that are not re-directed into the annulus by the deflector. With that said, another material that might be caught is the swarf created by the operation of the hole making equipment.
- the heating tool may comprise one or more chemical reaction heaters.
- the chemical reaction heaters preferably employ thermite or thermite based mixes for the generation of heat that is suitable to melt the alloy beads.
- Figure 2 shows a diagrammatic representation of the key stages of an annular seal repair method according to a second preferred embodiment of the present invention
- Figure 3 shows a diagrammatic representation of the key stages of an annular seal repair method according to a third preferred embodiment of the present invention.
- Figure 4 shows a preferred embodiment of the deflector used in the annular seal repair tool assembly of the present invention.
- each embodiment employs an annular seal repair tool assembly that comprises the core components of a heating tool and a deflector, wherein the deflector is located uphole of the heating tool.
- the annular seal repair tool assembly shown in each embodiment comprises certain other preferable components.
- Figure 1 shows the application of the annular seal repair method of the present invention in a wellbore target region where only a single annulus is present.
- the annulus 3 is defined by the outer casing 1 and the inner tubular body 2.
- an annular packer 4 Within the annulus 3 is provided an annular packer 4.
- the annular packer 4 shown in Figure 1 has a fault line which is causing the packer 4 to leak, hence the application of the annular seal repair method.
- the wellbore tubular body 2 has pre-openings 5 in the tubing wall of the inner tubular body. It is envisioned that the pre-existing holes may be the result of a previous downhole operation or could be provided by components already present on the tubular body 2; such as valves (e.g. sliding sleeve valves, gas lift mandrel valves, and pressure diverter subs).
- valves e.g. sliding sleeve valves, gas lift mandrel valves, and pressure diverter subs.
- annular seal repair tool assembly 6 is delivered downhole and brought into close proximity with the preexisting openings 5.
- the annular seal repair tool assembly 6 comprises a heating tool 7 that is located at the leading end of the assembly 6 at a position down-hole of a deflector 8.
- the annular seal repair tool assembly 6 is deployed downhole using a common delivery support that is connected to delivery means located above-ground at the surface of the wellbore.
- the delivery means are not shown in Figure 1 , but it will be appreciated by the skilled person that standard delivery means can be utilised to achieve the deployment of the assembly 6 to the downhole target region in which the openings 5 are located.
- delivery support is not shown in any detail, it will be appreciated that suitable types of delivery support include coiled tubing, pipe, slick line and wireline. It is appreciated that any combination of delivery support and delivery means can be employed provided it facilitates the controlled deployment of the annular seal repair tool assembly 6 to the downhole target region via the interior of the tubular body 2.
- the deflector 8 which is located down-hole of the openings 5, is expanded so that is extends radially outwards towards the surrounding wall of the tubular body 2.
- the expansion of the deflector 8 can be achieved by way of hydraulic means, pneumatic means, mechanical means and combinations thereof.
- deploying the assembly 6 downhole with the deflector 8 in an unexpanded or partially expanded state helps to make the assembly’s passage easier, particularly in wellbore tubular bodies of limited diameter and/or which contain obstructions. Reducing the size of deflector during transit also reduces the resistance due to the existing wellbore fluids by allowing some flow area for the fluid to pass the deflector. In addition, deploying the deflector in this way would also help prevent swabbing of the wellbore tubular body.
- the expansion of the deflector 8 towards the wall of the tubular body 2 greatly reduces the possibility that alloy beads 9 will fall past the assembly 6 without coming into contact with the deflector 8.
- alloy beads 9 are delivered to the downhole target region.
- the alloy beads are delivered by a process of dumping the alloy beads into the wellbore tubular body 2 at the surface of the wellbore above ground (not shown).
- dumped alloy beads 9 fall down the wellbore via the inner tubular body until they come into contact with the deflector 8, at which point they are re-directed radially outward towards the openings 5 in the wellbore tubular body 2 and out into the annulus 3.
- the alloy beads 9 then accumulate on the up-hole surface of the annular packer 4.
- the alloy beads can be formed from any alloy, provided the alloy melts at a temperature above that found within the downhole environment (e.g. around 5 to 50°C). This is important because it enables the alloy to form a stable solid plug within the annulus.
- the alloy beads 9 are formed from a low melting alloy that has a melting point that is no more than about 300°C and which further preferably comprises bismuth.
- Bismuth is preferred component because it its alloys tend to contract upon melting and expand upon re-solidification, which is considered beneficial when forming alloy plugs.
- the alloy beads will have a diameter in the range of 0.76 to 127mm (about 0.030 to 0.5 inches). However, ultimately the size of the beads will be determined by the openings in the tubular body wall and any other restrictions that might exist because the alloy beads must be able to pass downhole and through the openings into the annulus with relative freedom.
- the deflector 8 has an upper face that is dome-shaped such that alloy beads striking the deflector are redirected radially outward. It is appreciated that the upper surface of the deflector may comprise different shapes, ranging from cone-shaped to single flat sloped faces, and that any face shapes that help re-direct the alloy beads towards the tubular body wall are preferable.
- the upper face of the deflector it is not considered essential for the upper face of the deflector to be sloped because the process of redirecting the alloy beads towards the wall of the tubular body could also be achieved by agitating the downhole target region to help shake the alloy beads through the openings and into the annulus (see Figure 3).
- the molten alloy is allowed to cool and as it does the alloy resolidifies on top of the existing annular packer 4 to form a plug 10 which acts to seal any fissures/cracks in the packer.
- the flexible nature of the bands allows the deflector to compress, as necessary, to accommodate narrowed portions of the borehole that might be encountered during the annular seal repair tool assembly’s deployment. Once past the narrowed portion of a borehole, the resilient nature of the bands will cause the baffle to once again return to its expanded state, in which the deflector restricts the movement of alloy beads and fluid within the wellbore tubular body.
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- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Marine Sciences & Fisheries (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Earth Drilling (AREA)
- Gasket Seals (AREA)
- Pipe Accessories (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18/038,204 US20230417121A1 (en) | 2020-11-23 | 2021-11-22 | Single trip annular seal repair method and associated equipment |
EP21815638.8A EP4248059A1 (en) | 2020-11-23 | 2021-11-22 | Single trip annular seal repair method and associated equipment |
AU2021382394A AU2021382394A1 (en) | 2020-11-23 | 2021-11-22 | Single trip annular seal repair method and associated equipment |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2018390.1 | 2020-11-23 | ||
GB2018390.1A GB2601185B (en) | 2020-11-23 | 2020-11-23 | Improvements relating to downhole heater assemblies and methods of operating such |
GB2111408.7 | 2021-08-06 | ||
GB2111408.7A GB2603561B (en) | 2020-11-23 | 2021-08-06 | Single trip annular seal repair method and associated equipment |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022106848A1 true WO2022106848A1 (en) | 2022-05-27 |
Family
ID=78806557
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2021/053017 WO2022106848A1 (en) | 2020-11-23 | 2021-11-22 | Single trip annular seal repair method and associated equipment |
Country Status (4)
Country | Link |
---|---|
US (1) | US20230417121A1 (en) |
EP (1) | EP4248059A1 (en) |
AU (1) | AU2021382394A1 (en) |
WO (1) | WO2022106848A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001094741A1 (en) | 2000-03-30 | 2001-12-13 | Spencer Homer L | Annulus sealing method using eutectic metal and heat induction |
US20180003001A1 (en) * | 2015-01-27 | 2018-01-04 | Schlumberger Technology Corporation | Downhole cutting and sealing apparatus |
WO2019194844A1 (en) * | 2018-04-03 | 2019-10-10 | Schlumberger Technology Corporation | Methods, apparatus and systems for creating wellbore plugs for abandoned wells |
-
2021
- 2021-11-22 WO PCT/GB2021/053017 patent/WO2022106848A1/en active Application Filing
- 2021-11-22 EP EP21815638.8A patent/EP4248059A1/en active Pending
- 2021-11-22 US US18/038,204 patent/US20230417121A1/en active Pending
- 2021-11-22 AU AU2021382394A patent/AU2021382394A1/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001094741A1 (en) | 2000-03-30 | 2001-12-13 | Spencer Homer L | Annulus sealing method using eutectic metal and heat induction |
US20180003001A1 (en) * | 2015-01-27 | 2018-01-04 | Schlumberger Technology Corporation | Downhole cutting and sealing apparatus |
WO2019194844A1 (en) * | 2018-04-03 | 2019-10-10 | Schlumberger Technology Corporation | Methods, apparatus and systems for creating wellbore plugs for abandoned wells |
Also Published As
Publication number | Publication date |
---|---|
AU2021382394A1 (en) | 2023-06-29 |
US20230417121A1 (en) | 2023-12-28 |
EP4248059A1 (en) | 2023-09-27 |
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