CN114293944A - Associated gas type bittern well cement ring failure wellhead control process - Google Patents
Associated gas type bittern well cement ring failure wellhead control process Download PDFInfo
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- CN114293944A CN114293944A CN202210004007.5A CN202210004007A CN114293944A CN 114293944 A CN114293944 A CN 114293944A CN 202210004007 A CN202210004007 A CN 202210004007A CN 114293944 A CN114293944 A CN 114293944A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000004568 cement Substances 0.000 title claims abstract description 31
- 241001131796 Botaurus stellaris Species 0.000 title claims abstract description 25
- 238000007789 sealing Methods 0.000 claims abstract description 17
- 239000012530 fluid Substances 0.000 claims abstract description 14
- 238000005520 cutting process Methods 0.000 claims abstract description 12
- 239000012267 brine Substances 0.000 claims description 21
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 21
- 150000003839 salts Chemical class 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229910052736 halogen Inorganic materials 0.000 claims 1
- 230000005465 channeling Effects 0.000 abstract description 9
- 239000000126 substance Substances 0.000 abstract description 4
- 238000005422 blasting Methods 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 13
- 239000007788 liquid Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 208000004350 Strabismus Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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Abstract
The invention relates to an associated gas type bittern well cement ring failure wellhead control process, which comprises the following steps: arranging a square well at the bittern well mouth to expose a casing and a cement sheath of the bittern well; well killing treatment: injecting a well killing fluid into the well to prevent associated gas in the well from channeling upwards; pouring concrete in the square well and reserving the positions to be cut of the casing and the wellhead; cutting and disassembling a wellhead before concrete is solidified, and arranging a stopper to enable the stopper to be vertically centered and aligned and matched with a shaft; a new wellhead is connected and arranged above the limiting stopper, and the joint of the new wellhead and the limiting stopper is sealed; and (5) carrying out sealing pressure test, and carrying out sealing repair if the sealing performance does not reach the standard. The process can plug the fluid in the original shaft, avoids upward channeling under the action of the ground pressure, can safely remove the wellhead without accidents such as blasting and the like, can clean up insoluble substances, collapsed substances, damaged casings and the like at the bottom of the well, and provides favorable conditions for sealing or repairing the whole well section.
Description
Technical Field
The invention relates to the technical field of mine well control treatment, in particular to a process for controlling a wellhead of associated gas type bittern well cement ring failure.
Background
The salt brine well comprises a well only containing brine and a well containing associated gas, part of associated gas type wells even contain toxic and harmful gases such as hydrogen sulfide and the like, and aiming at the condition that a well cementation cement sheath fails, a new well mouth is installed after the well mouth is cut off by adopting a fire cutting or hydraulic cutting mode in the prior art, and then the well is sealed or repaired, so that the construction time is long, the risk is high, and accidents such as explosion, personnel poisoning and the like are easy to happen.
Therefore, the existing brine well still has a part to be improved urgently in well control treatment after the cement sheath fails, potential safety hazards in a well control mode and a process of the existing brine well are controlled to be eliminated, and meanwhile, the efficiency is improved in a well control process, so that the treatment of wellhead control is more efficient and faster. Therefore, a more reasonable technical scheme should be provided to solve the technical problems existing in the prior art.
Disclosure of Invention
In order to solve the defects of the prior art mentioned in the content, the invention provides a control process of a cement ring failure wellhead of an associated gas type bittern well, aiming at the situation that the cement ring failure of the cementing cement ring of the associated gas type bittern well, the fluid in the well flees along the annular crack, pollutes the surface and the underground water and causes the damage of the ecological environment, the novel wellhead control process and the special process are adopted to safely control the wellhead, prevent the fluid in the well from overflowing, reduce the construction risk and create conditions for the next well sealing or well repairing.
In order to achieve the purpose, the invention specifically adopts the technical scheme that:
an associated gas type bittern well cement ring failure wellhead control process comprises the following steps:
arranging a square well at the brine well mouth, wherein the square well exposes a casing and a cement sheath of the brine well;
performing well killing treatment: injecting a well killing fluid into the well through the original pipeline of the brine well to prevent associated gas in the well from channeling upwards;
pouring concrete in the square well, pouring a wellhead with the height lower than that of the salt brine well, and keeping the positions to be cut of the sleeve and the wellhead;
before the concrete is solidified, cutting a casing and a cement sheath of the brine well to disassemble a wellhead, arranging a limiting stopper at the reserved shaft, enabling the limiting stopper to be vertically centered to be aligned and matched with the shaft, and fixing the limiting stopper;
a new wellhead is connected and arranged above the limiting stopper, and the joint of the new wellhead and the limiting stopper is sealed;
and carrying out sealing pressure test according to a set pressure value, and carrying out sealing repair if the sealing performance does not reach the standard, so that the pressure drop of the new wellhead within 30min is smaller than a set value of 0.5 MPa.
According to the control process disclosed by the invention, the well killing treatment is carried out in the shaft of the salt brine well, so that the pressure balance between the shaft and the stratum is maintained, blowout and associated gas channeling are avoided, and the pressure of the stratum below the shaft is offset by using the pressure of a liquid column of the killing fluid, so that the construction and repair of a damaged well mouth above the shaft are allowed; after the well mouth is replaced, the new well mouth and the original well barrel can be well connected and have an airtight effect, efficient repair of the failed well mouth of the brine well is achieved, risks existing in the traditional well mouth repair control process are avoided, and the stability and reliability of well mouth control are improved.
Further, in the present invention, the stopper functions to cooperate with the reserved wellbore to define the new wellhead position and angle, and the structure of the stopper is not limited uniquely, and it can be constructed in various possible structures, which are optimized and one of the possible options is: the limiting device comprises a cylinder part sleeved on the reserved shaft, and a limiting part which is tightly connected with the reserved shaft in a propping manner is arranged in the cylinder part; the limiting part is tightly abutted to the reserved upper port of the shaft, and the limiting part is provided with a communicating port. When the scheme is adopted, the communicating port of the limiting part is communicated with the reserved shaft and the barrel part, and after a new shaft mouth is arranged, the communicating port is communicated with a communicating channel which is used as the new shaft mouth and the shaft.
Further, in order to conveniently set a new wellhead, when the size of the new wellhead deviates from that of the barrel, adjustment can be performed to ensure stable and reliable communication, and optimization is performed here to give one of the feasible options: the cylinder part is connected with a new wellhead through a reducing flange. When the scheme is adopted, the joints of the reducing flange, the new well head and the cylinder part are all subjected to sealing treatment.
Further, in the present invention, the axis of the cylinder coincides with the axis of the reserved shaft, and in order to ensure that the cylinder can keep the direction stable and unchanged when bearing load, the following feasible options are optimized and set forth: the cylinder part extends downwards and is connected with the supporting compression ring, and the supporting compression plate is fixed in the square shaft through poured concrete.
Furthermore, in the invention, the main function of the pressure supporting ring is to stabilize the stress maintaining cylinder part, the size of the stress surface of the pressure supporting ring is in positive correlation with the stability degree of the cylinder part, meanwhile, the pressure in the concrete is in all directions, and in order to make the stress direction of the pressure supporting ring single and stable, the pressure supporting ring is optimized and one of the feasible options is provided: the pressure supporting ring is arranged at the bottom end of the barrel part, and the pressure supporting ring is attached to the bottom of the square well and the attachment surface is sealed. When adopting such scheme, hold in the palm clamping ring and section of thick bamboo integrated into one piece, receive the pressure of concrete and all downwards, make and hold in the palm the bottom that clamping ring closely laminated in the square well to make section of thick bamboo remain stable direction.
Still further, in the invention, the liquid column plugging effect of the well killing is fully considered, and the adopted well killing liquid comprises clear water when well killing is carried out. When the scheme is adopted, the fresh water injected into the well in the mine area to dissolve the salt can be adopted as the clean water, the liquid column pressure can be formed in the well and is greater than the stratum pressure, the fluid is prevented from channeling upwards, and the method is safe, pollution-free, wide in source and relatively economic.
Furthermore, in order to conveniently arrange the stopper, the pouring depth is limited when the concrete is poured, and the following feasible options are optimized and provided: when concrete is poured into the square well, the distance between the forming surface of the concrete and the upper port of the reserved shaft is more than or equal to 10 cm.
Further, when concrete is poured, the density of the concrete is 1.85g/cm3The initial setting time is more than 20 min. When adopting such scheme, need carry out the cutting of original well head behind the concreting and get rid of, with the location setting of stopper, follow-up new well head that still needs to connect, consequently need the initial set time of concrete can not be too short, otherwise the time of follow-up operation is insufficient.
Further, in the invention, in order to improve the efficiency of the whole well control and reduce the uncontrollable property of the whole operation process, the time for cutting the casing and the cement sheath of the brine well to disassemble the wellhead is limited to be less than or equal to 10 min.
Furthermore, in the invention, the excavation engineering of the square well is only required to meet the well control requirement, the side length of the square well is 1.8-2.2 m, and the depth is 4.5-5.5 m.
Compared with the prior art, the invention has the beneficial effects that:
the control process adopted by the invention can plug the fluid in the original shaft, avoid the upward channeling under the action of the pressure of the ground, safely remove the wellhead without accidents such as blasting and the like, clean the insoluble substances, the collapsed substances, the damaged casing and the like at the shaft bottom and provide favorable conditions for the sealing or well repair of the whole well section.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic process diagram for controlling the process.
Fig. 2 is a schematic cross-sectional view of the overall structure after wellhead replacement.
In the above drawings, the meaning of each symbol is: 1. a square well; 2. a limiting part; 3. a variable diameter flange; 4. a new wellhead; 5. concrete; 6. supporting a pressure ring; 7. a sleeve; 8. a barrel portion.
Detailed Description
The invention is further explained below with reference to the drawings and the specific embodiments.
It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Specific structural and functional details disclosed herein are merely illustrative of example embodiments of the invention. This invention may, however, be embodied in many alternate forms and should not be construed as limited to the embodiments set forth herein.
Examples
Aiming at the potential safety hazard of blasting in the brine well control process in the prior art, the repair of a shaft is not facilitated, and the current situation of poor well control effect is solved by optimizing the method.
Specifically, as shown in fig. 1 and 2, the embodiment provides a process for controlling a wellhead with associated gas type bittern well cement ring failure, which comprises the following steps:
s1: arranging a square well 1 at a bittern well mouth, wherein the square well 1 exposes a casing 7 and a cement sheath of the bittern well;
s2: performing well killing treatment: injecting a well killing fluid into the well through the original pipeline of the brine well to prevent associated gas in the well from channeling upwards;
s3: pouring concrete 5 in the square well 1, pouring a well mouth with the height lower than that of the salt brine well, and keeping a position to be cut of the sleeve 7 and the well mouth;
s4: before the concrete 5 is solidified, cutting a casing 7 and a cement sheath of the brine well to disassemble a wellhead, arranging a limiting stopper at a reserved shaft, enabling the limiting stopper to be vertically centered to be aligned and matched with the shaft, and fixing the limiting stopper;
s5: a new wellhead 4 is connected and arranged above the limiter, and the connection part of the new wellhead 4 and the limiter is sealed;
s6: and carrying out sealing pressure test according to a set pressure value, and carrying out sealing repair if the sealing performance does not reach the standard, so that the pressure drop of the new wellhead 4 within 30min is smaller than a set value of 0.5 MPa.
According to the control process disclosed by the invention, the well killing treatment is carried out in the shaft of the salt brine well, so that the pressure balance between the shaft and the stratum is maintained, blowout and associated gas channeling are avoided, and the pressure of the stratum below the shaft is offset by using the pressure of a liquid column of the killing fluid, so that the construction and repair of a damaged well mouth above the shaft are allowed; after the well mouth is replaced, the new well mouth 4 can be well connected with the original well barrel and the airtight effect can be kept, the efficient repair of the failed well mouth of the brine well is realized, the risk existing in the traditional well mouth repair control process is avoided, and the stability and the reliability of the well mouth control are improved.
In this embodiment, the stop-ring functions to cooperate with the reserved wellbore to define the position and angle of the new wellhead 4, and the structure of the stop-ring is not limited uniquely, and it can be constructed in many possible configurations, optimized here and using one of the possible options: the limiting device comprises a cylinder part 8 sleeved on the reserved shaft, and a limiting part 2 tightly connected with the reserved shaft in a propping manner is arranged in the cylinder part 8; the limiting part 2 is tightly abutted to the reserved upper port of the shaft, and the limiting part 2 is provided with a communicating port. When the scheme is adopted, the communicating port of the limiting part 2 is vertically communicated, the reserved shaft and the barrel part 8 are communicated through the communicating port, and after the new shaft mouth 4 is arranged, the communicating port and the communicating channel which is used as the new shaft mouth 4 and the shaft are communicated.
Preferably, the structure of the limiting part 2 can be a cylindrical structure with a concave middle, and the communication port is arranged in the middle of the limiting part 2; the bore of the communicating opening is smaller than the inner bore of the reserved shaft, the outer diameter of the limiting stopper is larger than the outer diameter of the reserved shaft, and therefore the limiting stopper is connected with the reserved shaft in a correct alignment mode, and the connecting direction stability of the barrel portion 8 is improved. When the limiter is set, the limiter is fixed by means of a guy rope or a tripod and the like to prevent deflection.
In order to facilitate the setting of the new wellhead 4, when there is a deviation in the dimensions of the new wellhead 4 and the barrel 8, adjustments may be made to ensure that the communication is stable and reliable, where optimization is made and one of the possible options is adopted: the cylinder part 8 is connected with a new wellhead 4 through a reducing flange 3. When the scheme is adopted, the joints of the reducing flange 3, the new well head 4 and the cylinder part 8 are all subjected to sealing treatment.
Preferably, when setting for new well head 4, adopt modes such as tripod to adorn new well head 4 in section of thick bamboo portion 8, guarantee that the well head is perpendicular between two parties not squint, weld the connection position, ensure to seal no sand hole.
In the present embodiment, the axis of the barrel 8 coincides with the axis of the remaining wellbore, and in order to ensure that the barrel 8 can keep the direction stable and unchanged when bearing load, the following feasible options are optimized and adopted: the barrel part 8 extends downwards and is connected with the supporting and pressing ring 6, and the supporting and pressing plate is fixed in the square well 1 through the poured concrete 5.
Preferably, in this embodiment, the inner edge of the pressure ring 6 is welded and fixed to the cylinder 8, and the outer edge of the pressure ring 6 is provided with an upturned edge structure. In some embodiments, the ring 6 may also be integrally formed with the barrel 8.
In other embodiments, the structure of the pressure ring 6 may be configured in other forms, for example, the pressure ring 6 is provided as a plurality of pressure plates radially spaced along the radial direction of the lower port of the barrel 8.
In this embodiment, the main function of the pressure ring 6 is to keep the stability of the cylinder 8, the size of the stressed surface thereof is positively correlated with the stability of the cylinder 8, meanwhile, the pressure inside the concrete 5 is omnidirectional, and for the single stability of the stressed direction of the pressure ring 6, the pressure ring is optimized and adopts one of the feasible options: the pressure supporting ring 6 is arranged at the bottom end of the barrel part 8, and the pressure supporting ring 6 is attached to the bottom of the square well 1 and the attachment surface is sealed. When the scheme is adopted, the pressure ring 6 and the barrel part 8 are integrally formed, and the pressure of the concrete 5 is applied to the whole downward direction, so that the pressure ring 6 is tightly attached to the bottom of the square well 1, and the barrel part 8 keeps a stable direction.
In the embodiment, the liquid column plugging effect of the well killing is fully considered, and the adopted well killing liquid comprises clear water during well killing treatment. When the scheme is adopted, the fresh water injected into the well in the mine area to dissolve the salt can be adopted as the clean water, the liquid column pressure can be formed in the well and is greater than the stratum pressure, the fluid is prevented from channeling upwards, and the method is safe, pollution-free, wide in source and relatively economic.
In order to facilitate the arrangement of the stop, the depth of the casting is limited when the concrete 5 is cast, and the following feasible options are adopted: when the concrete 5 is poured into the square well 1, the distance between the forming surface of the concrete 5 and the upper port of the reserved shaft is more than or equal to 10 cm.
In the embodiment, when the concrete 5 is poured, the density of the concrete 5 is 1.85g/cm3, and the initial setting time is more than 20 min. When adopting such scheme, need carry out the cutting of original well head behind the concreting 5 and get rid of, with the location setting of stopper, follow-up new well head 4 that still needs to connect, consequently need concrete 5's initial set time can not be too short, otherwise the time of follow-up operation is insufficient.
In the embodiment, in order to improve the efficiency of the overall well control and reduce the uncontrollable property of the whole operation process, the time for cutting the casing 7 and the cement sheath of the brine well to disassemble the wellhead is limited to be less than or equal to 10 min.
Further, in this embodiment, the excavation engineering of the square well 1 is only required to meet the well control requirement, the side length of the square well 1 is 1.8-2.2 m, and the depth is 4.5-5.5 m.
Preferably, the side length of the square well 1 is set to be 2m and the depth is set to be 5 m.
The above embodiments are just exemplified in the present embodiment, but the present embodiment is not limited to the above alternative embodiments, and those skilled in the art can obtain other various embodiments by arbitrarily combining with each other according to the above embodiments, and any other various embodiments can be obtained by anyone in light of the present embodiment. The above detailed description should not be construed as limiting the scope of the present embodiments, which should be defined in the claims, and the description should be used for interpreting the claims.
Claims (10)
1. An associated gas type bittern well cement ring failure wellhead control process is characterized by comprising the following steps:
arranging a square well (1) at a bittern well mouth, wherein the square well (1) exposes a casing (7) and a cement sheath of the bittern well;
performing well killing treatment: injecting well killing fluid into the well through the original pipeline of the brine well to form a fluid column in the shaft;
pouring concrete (5) in the square well (1), pouring a wellhead with the height lower than that of the salt-halogen well, and keeping the sleeve (7) and the planned cutting position of the wellhead;
before the concrete (5) is solidified, cutting a casing (7) and a cement sheath of the salt brine well to disassemble a wellhead, arranging a limiting stopper at a reserved shaft, enabling the limiting stopper to be vertically centered to be aligned and matched with the shaft, and fixing the limiting stopper;
a new wellhead (4) is connected and arranged above the limiting stopper, and the joint of the new wellhead (4) and the limiting stopper is sealed;
and carrying out sealing pressure test according to a set pressure value, and carrying out sealing repair if the sealing performance does not reach the standard, so that the pressure drop of the new wellhead (4) within 30min is smaller than a set value of 0.5 MPa.
2. The associated gas type bittern well cement ring failure wellhead control process according to claim 1, wherein said stopper comprises a barrel part (8) sleeved on the reserved shaft, a stopper part (2) tightly connected with the reserved shaft is arranged in the barrel part (8); the limiting part (2) is tightly abutted to the reserved upper port of the shaft, and the limiting part (2) is provided with a communicating port.
3. The associated gas type bittern well cement ring failure wellhead control process according to claim 2, wherein said barrel (8) is connected to new wellhead (4) by reducing flange (3).
4. The associated gas type bittern well cement ring failure wellhead control process according to claim 2, wherein said barrel section (8) extends downwards and connects with pressure supporting ring (6), and poured concrete (5) fixes the pressure supporting plate in square well (1).
5. The associated gas type bittern well cement ring failure wellhead control process according to claim 4, wherein said pressure ring (6) is installed at the bottom end of the barrel (8), the pressure ring (6) is attached to the bottom of the square well (1) and the attachment surface is sealed.
6. The associated gas type bittern well cement ring failure wellhead control process of claim 1, wherein the killing fluid used in the killing treatment comprises clean water.
7. The associated gas type bittern well cement ring failure wellhead control process according to claim 1, wherein when pouring concrete (5) into the square well (1), the distance between the forming surface of concrete (5) and the upper port of the reserved shaft is more than or equal to 10 cm.
8. The associated gas type bittern well cement ring failure wellhead control process according to claim 1, wherein said concrete (5) density is 1.85g/cm3, initial setting time is more than 20 min.
9. The associated gas type bittern well cement sheath failure wellhead control process according to claim 1, wherein time for cutting out outer casing (7) and cement sheath of bittern well to detach wellhead is less than or equal to 10 min.
10. The associated gas type bittern well cement ring failure wellhead control process according to claim 1, wherein the side length of said square well (1) is 1.8-2.2 m, and the depth is 4.5-5.5 m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210004007.5A CN114293944B (en) | 2022-01-04 | 2022-01-04 | Associated gas type bittern well cement sheath failure wellhead control process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210004007.5A CN114293944B (en) | 2022-01-04 | 2022-01-04 | Associated gas type bittern well cement sheath failure wellhead control process |
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| CN114293944A true CN114293944A (en) | 2022-04-08 |
| CN114293944B CN114293944B (en) | 2024-03-26 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4844164A (en) * | 1988-05-27 | 1989-07-04 | Union Oil Company Of California | Process and composition for treating underground formations penetrated by a well borehole |
| AU2012227287A1 (en) * | 2011-10-03 | 2013-04-18 | National Oilwell Varco Uk Limited | Valve and Method of operating a valve |
| WO2019140336A1 (en) * | 2018-01-12 | 2019-07-18 | Coiled Tubing Specialties, Llc | Ported casing collar for downhole operations, and method for accessing a formation |
| CN112318376A (en) * | 2020-10-27 | 2021-02-05 | 宝鸡市石油矿山机械配件厂 | Construction method and device for cutting steel pipe and casing cement sheath |
-
2022
- 2022-01-04 CN CN202210004007.5A patent/CN114293944B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4844164A (en) * | 1988-05-27 | 1989-07-04 | Union Oil Company Of California | Process and composition for treating underground formations penetrated by a well borehole |
| AU2012227287A1 (en) * | 2011-10-03 | 2013-04-18 | National Oilwell Varco Uk Limited | Valve and Method of operating a valve |
| WO2019140336A1 (en) * | 2018-01-12 | 2019-07-18 | Coiled Tubing Specialties, Llc | Ported casing collar for downhole operations, and method for accessing a formation |
| CN112318376A (en) * | 2020-10-27 | 2021-02-05 | 宝鸡市石油矿山机械配件厂 | Construction method and device for cutting steel pipe and casing cement sheath |
Non-Patent Citations (1)
| Title |
|---|
| 张振国: "复杂地质盐卤井定向对接连通开采盐卤水新技术", 《中国井矿盐》, vol. 47, no. 1, 31 December 2016 (2016-12-31), pages 16 - 18 * |
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| CN114293944B (en) | 2024-03-26 |
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