CN109723402A - Casing pressure control well cementation process - Google Patents
Casing pressure control well cementation process Download PDFInfo
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- CN109723402A CN109723402A CN201711030180.8A CN201711030180A CN109723402A CN 109723402 A CN109723402 A CN 109723402A CN 201711030180 A CN201711030180 A CN 201711030180A CN 109723402 A CN109723402 A CN 109723402A
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- 238000000034 method Methods 0.000 title abstract description 13
- 230000008569 process Effects 0.000 title abstract description 9
- 239000011148 porous material Substances 0.000 claims abstract description 22
- 238000010276 construction Methods 0.000 claims abstract description 21
- 238000005516 engineering process Methods 0.000 claims description 25
- 238000005553 drilling Methods 0.000 claims description 19
- 208000034656 Contusions Diseases 0.000 claims description 18
- 239000004568 cement Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 229920002472 Starch Polymers 0.000 claims description 2
- 235000019698 starch Nutrition 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000015271 coagulation Effects 0.000 abstract 1
- 238000005345 coagulation Methods 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 description 17
- 239000007788 liquid Substances 0.000 description 8
- 239000002002 slurry Substances 0.000 description 8
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 5
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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Abstract
The invention discloses a casing pressure control well cementation process, and belongs to the technical field of oil and gas development well cementation. The casing pressure-control well cementation process sequentially comprises the following steps: casing setting stage, cementing and replacing stage, and bumping and waiting coagulation stage; and in the casing running stage, the cementing and replacing stage and the bumping and waiting-setting stage, controlling the annular pressure of a wellhead to keep the bottom hole circulation equivalent density of the well section with the narrow safety density window between the pore pressure equivalent density and the fracture pressure equivalent density corresponding to the well section with the narrow safety density window. In the well cementation process, through well head annulus pressure control, the well bottom circulation equivalent density corresponding to the well section with the narrow safety density window is between the pore pressure equivalent density and the fracture pressure equivalent density, so that a pressure-bearing weak stratum is not pressed and leaked while a stable oil gas display layer position is pressed, the casing well cementation construction risk of the well section with the narrow safety density window is reduced, the well cementation quality is improved, the well integrity is improved, and the development benefit is ensured.
Description
Technical field
The present invention relates to oil development cementing technology field, in particular to a kind of casing pressure control well shaft fixing technology.
Background technique
Casing cementing is to inject cement by casing G.I.H, and into the annular space between the borehole wall and casing, to water
By the process of oil reservoir, gas-bearing formation and water layer packing in wellbore after mud solidification, to protect oil gas casing, increase the oil/gas well service life,
It is one of the important link of oil gas well drilling engineering.
Currently, the basic process of casing cementing is, will be infused after predeterminated position under casing lower going-into-well using double rubber plug methods
Cement and replacement construction, carry out bruising later, casing cementing are completed after theing cement solidifies.Pass through constantly changing to cement slurry property
Into, including thickening time control, dehydration control, final setting time control, Auto-regulating System of Density of Heavy Medium etc., and the improvement of property of drilling fluid is come
Meet the casing cementing demand of different condition wellbore.
However, for narrow ' Safe Density Windows stratum, using existing casing cementing technique be easy to cause leakage or
Aggravation leakage causes to alter on the oil gas of lower part well section so that head of liquid be caused to reduce, and interface cementing strength is low, causes to cement the well
It is off quality；And it is not easy to press stable high-pressure layer, alter on oil gas is easy；In addition, replacement efficiency is low, the borehole wall and casing in well cementing process
False filter cake, oil film and drilling fluid on wall are difficult to clean completely.The above problem often leads to high narrow ' Safe Density Windows stratum set
Pipe cementing operation operation well control safety risk is high, it is difficult to which cementing quality guarantees, opens oil/gas well integrality, oil gas field long-term safety
Hair affects greatly.
Summary of the invention
In order to solve the above technical problems, the embodiment of the present invention, which provides one kind, can reduce narrow ' Safe Density Windows stratum
Casing cementing construction risk casing pressure control well shaft fixing technology.
Specifically, including technical solution below.
The embodiment of the invention provides a kind of casing pressure control well shaft fixing technology, described sleeve pipe pressure control well shaft fixing technology successively includes:
Setting of casing stage, cementing and replacement stage, bruising and time solidifying stage；
It in the setting of casing stage, the cementing and replaces stage, the bruising and waits in the solidifying stage, by controlling well
Mouth annular pressure makes the shaft bottom of narrow ' Safe Density Windows well section recycle equal yield density and is maintained at the narrow ' Safe Density Windows well section
Between corresponding pore pressure equal yield density and fracture pressure equal yield density.
Specifically, in the setting of casing stage, predeterminated position back seat casing hanger under described sleeve pipe lower going-into-well follows later
Ring reduces drilling fluid density, and the pressure control equipment by the way that well head is arranged in applies back pressure from well head, controls well head annular pressure, makes
The shaft bottom circulation equal yield density of the narrow ' Safe Density Windows well section is maintained at the corresponding hole of the narrow ' Safe Density Windows well section
Between gap pressure equivalent density and fracture pressure equal yield density.
Specifically, in the cementing and in the replacement stage, the pressure control equipment by the way that well head is arranged in applies back from well head
Pressure controls well head annular pressure, so that the shaft bottom of the narrow ' Safe Density Windows well section is recycled equal yield density and is maintained at the narrow peace
Between the corresponding pore pressure equal yield density of theoretical density window well section and fracture pressure equal yield density, the back pressure value that is applied according to
Annular space slurry rod structure situation of change is calculated.
Specifically, the cementing and replacement stage include cementing practice, note mud replacement construction and note clear water replacement
Construction.
Specifically, solid according to prestressing force after carrying out note clear water replacement construction to bruising in the bruising and in the Hou Ning stage
Well requires to carry out well head annular space to build the pressure Hou Ning, and the back pressure value applied needed for rod structure calculates is starched according to final annular space, passes through institute
The pressure control equipment that well head is set is stated from well head application back pressure, well head annular pressure is controlled, makes the narrow ' Safe Density Windows well
The shaft bottom circulation equal yield density of section is maintained at the corresponding pore pressure equal yield density of the narrow ' Safe Density Windows well section and rupture
Between pressure equivalent density, after theing cement solidifies, cementing operation is completed.
Specifically, described sleeve pipe is seamless steel pipe.
Technical solution provided in an embodiment of the present invention the utility model has the advantages that
In casing pressure control well shaft fixing technology provided in an embodiment of the present invention, in casing cementing work progress, by controlling well
Mouth annular pressure makes the shaft bottom circulation equal yield density of narrow ' Safe Density Windows well section be maintained at narrow ' Safe Density Windows well section corresponding
Pore pressure equal yield density and fracture pressure equal yield density between, it is ensured that do not press leakage to hold while pressing steady hydrocarbon show zones position
Weak formation is pressed, the risk for leading to well cementing operation failure is altered on the pressure leakage stratum that avoids conventional cannula cementing operation from occurring on oil gas,
The casing cementing construction risk of narrow ' Safe Density Windows well section is substantially reduced, while cementing quality can be increased substantially, improves well
Integrality meets later development production needs.
Casing pressure control well shaft fixing technology provided in an embodiment of the present invention is for conventional sandstone, carbonate and other complicated narrow peaces
The casing cementing construction of theoretical density window well section is applicable in, especially suitable for high temperature and pressure ultra-deep shaft well ' Safe Density Windows well section
Casing cementing construction.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described
Fig. 1 is a kind of flow chart of casing pressure control well shaft fixing technology provided in an embodiment of the present invention；
Fig. 2 is a kind of cementing operation curve graph of casing pressure control well shaft fixing technology shown according to an exemplary embodiment；
Wherein, 1. the number in Fig. 2, which represents, reduces mud density, 2. represents and adjusts mud property, 3. represents termination of pumping, back brake
4. door represents note flushing liquor, 5. represents cement injection, 6. represent termination of pumping, back brake door opens backing pin, 7. represent injection pressure plug liquid, 8. generation
Table replaces drilling fluid, 9. represents and replaces clear water bruising.
Specific embodiment
To keep technical solution of the present invention and advantage clearer, below in conjunction with attached drawing to embodiment of the present invention make into
One step it is described in detail.Unless otherwise defined, all technical terms used in the embodiment of the present invention all have and art technology
The normally understood identical meaning of personnel.
Narrow ' Safe Density Windows well section refers to that the formation fracture pressure of the well section is not much different with formation pore pressure, drilling well
The density range very little that liquid can choose, Yi Fasheng drilling complexity situation, drilling fluid density cause leakage beyond this range, are lower than
This range causes cave-in chip off-falling, for this kind of well section, is easy to appear on oil gas and alters or leakage during casing cementing
The problem of, cause well cementation to fail, or even safety accident can be caused.
Based on the above, referring to Fig. 1, the casing pressure control is solid the embodiment of the invention provides a kind of casing pressure control well shaft fixing technology
Well technique successively includes: setting of casing stage, cementing and replaces stage, bruising and wait the solidifying stage；
In setting of casing stage, cementing and replaces stage, bruising and wait in the solidifying stage, by controlling well head annular pressure,
So that the shaft bottom of narrow ' Safe Density Windows well section is recycled equal yield density (ECD) and is maintained at the corresponding hole of narrow ' Safe Density Windows well section
Between pressure equivalent density and fracture pressure equal yield density.
In casing pressure control well shaft fixing technology provided in an embodiment of the present invention, in casing cementing work progress, by controlling well
Mouth annular pressure makes the shaft bottom circulation equal yield density of narrow ' Safe Density Windows well section be maintained at narrow ' Safe Density Windows well section corresponding
Pore pressure equal yield density and fracture pressure equal yield density between, it is ensured that do not press leakage to hold while pressing steady hydrocarbon show zones position
Weak formation is pressed, the risk for leading to well cementing operation failure is altered on the pressure leakage stratum that avoids conventional cannula cementing operation from occurring on oil gas,
The casing cementing construction risk of narrow ' Safe Density Windows well section is substantially reduced, while cementing quality can be increased substantially, improves well
Integrality meets later development production needs.
Well head annular pressure involved in the embodiment of the present invention refers to the skill for being applied to well head production string and tripping in
Annular pressure value between art casing.
Specifically, in the setting of casing stage, predeterminated position back seat hanging sleeve pipe hanger under casing lower going-into-well recycles later
It reduces drilling fluid density and the pressure control equipment by the way that well head is arranged in and applies back pressure from well head, control well head annular pressure, make
The shaft bottom circulation equal yield density of narrow ' Safe Density Windows well section is maintained at the corresponding pore pressure of narrow ' Safe Density Windows well section and works as
Between metric density and fracture pressure equal yield density.
In the setting of casing stage, it can will be covered using casing+bruising assembly+float collar+casing shoe+guide shoe pipe pipe string combination
Under pipe lower going-into-well.
Specifically, in cementing and in the replacement stage, including cementing practice, note mud replace construction and note clear water replaces
Construction is injected flushing liquor into annular space by equipment such as cementing truck, slush pumps, cement slurry, tamponade liquid, replaces drilling fluid, clear water
Equal liquid apply back pressure from well head by the way that the pressure control equipment of well head is arranged in above process, control well head annular pressure, make
The shaft bottom circulation equal yield density of narrow ' Safe Density Windows well section is maintained at the corresponding pore pressure of narrow ' Safe Density Windows well section and works as
Between metric density and fracture pressure equal yield density, the back pressure value applied is starched rod structure situation of change according to annular space and is calculated.
Specifically, it in bruising and in the Hou Ning stage, after carrying out note clear water replacement construction to bruising, is wanted according to special cementing
It asks and carries out well head annular space and build the pressure Hou Ning, starch the back pressure value applied needed for rod structure calculates according to final annular space at the same time, pass through
The pressure control equipment that well head is arranged in applies back pressure from well head, controls well head annular pressure, makes the well of narrow ' Safe Density Windows well section
Bottoming cycle equal yield density is maintained at the corresponding pore pressure equal yield density of narrow ' Safe Density Windows well section and fracture pressure equivalent is close
Between degree.After theing cement solidifies, cementing operation is completed.
Specifically, in casing pressure control well shaft fixing technology provided in an embodiment of the present invention, for controlling the control of well head annular pressure
Pressure equipment may include swivel control head, self-choke control sled, back pressure compensation pump, data acquistion and control system etc..For
The levels of precision embodiment of the present invention of pressure control setting is not particularly limited, can be according to the Pore Pressure of narrow ' Safe Density Windows well section
Power and the gap of formation fracture pressure determine.When pore pressure and larger formation fracture pressure gap, can choose accurate
The lower pressure control equipment of degree；And when pore pressure and smaller formation fracture pressure gap, it is higher to can choose levels of precision
Pressure control equipment.
In casing pressure control well shaft fixing technology provided in an embodiment of the present invention, casing is oil/gas well seamless steel pipe.
Casing pressure control well shaft fixing technology provided in an embodiment of the present invention is done further in detail below by Specific construction data
Thin description.
By certain casing pressure control well cementation for, Φ 311.2mm wellbore drilling after the completion of, using Φ 244.5mm casing into
Row sealing 0.00m~3206.00m well section uses density 1.75g/cm when drilling well3Drilling fluid carry out fine controlled pressure drilling, control
Pressure 0.5~3.0MPa of value, well safe Density Window are 1.80~1.91g/cm3。
Casing pressure control well shaft fixing technology includes:
(1) setting of casing: drawn using Φ 244.5mm × TP110TS × 11.99mm casing+bruising assembly+float collar+casing shoe+
The combination of shoe joint string, under send casing to well depth 3206.00m, cover for seat pipe hanger, pressure control circulation adjustment drilling fluid density to 1.68g/cm3
Well head annular pressure is controlled in 2.2~5.69Mpa afterwards.
(2) cementing practice: well head annular pressure is controlled in 2.2~5.69Mpa, and in ground batch mixing cement slurry, water
Mud vehicle positive injection flushing liquor 6.0m3(pump pressure 3.3~4.5MPa, 2.0~2.6m of discharge capacity3/ min), positive injection praise G grades of extended slurries of China
88.0m3(cement dry ash 116t is pumped 0.5~4.1MPa, 2.0~2.4m of discharge capacity3/ min, cement slurry density are averaged 1.90g/
cm3), G grades of quick-drying cement slurry 47.6m of positive injection3(cement dry ash 62.9t is pumped 0.5~4.1MPa, 2.0~2.4m of discharge capacity3/ min,
Cement slurry density is averaged 1.90g/cm3), well head annular pressure is controlled in 2.2~5.69MPa, back brake door opens backing pin.
(3) note mud replaces construction: cementing truck positive injection density 1.03g/cm3Tamponade liquid 2.0m3(pump pressure 0.5~
4.1MPa, 2.0~2.4m of discharge capacity3/ min), slush pump positive injection replaces drilling fluid 100.0m3(pump pressure 0.5~7.9MPa, discharge capacity 2.0
~2.6m3/min)。
(4) note clear water replaces simultaneously bruising: cementing truck is just replacing density 1.0g/cm3Clear water 18.0m3(pump pressure 7.7~
11.8MPa, 1.8~2.0m of discharge capacity3/ min), just replace density 1.0g/cm3Clear water 2.1m3(pump pressure 11.5~12.0MPa, discharge capacity
1.0~1.2m3/ min), 11.49 ↑ 25.0MPa of the vertical pressure of bruising.
(5) Hou Ning: annular space well head builds the pressure 6MPa Hou Ning, and construction is completed.
As shown in Fig. 2, after setting of casing, cover for seat pipe hanger, being dropped to guarantee that the cementing operation of casing pressure control is smoothly implemented
Low drilling fluid density operation, by drilling fluid density by 1.75g/cm3It is down to 1.68g/cm3, while passing through ground pressure control equipment for well
The control of mouth annular pressure is in 2.2~5.69MPa, at this point, shaft bottom circulation equal yield density is 1.86g/cm3, between formation pore pressure
Power equal yield density 1.80g/cm3With formation fracture pressure equal yield density 1.91g/cm3Between, press quietly layer.In cementing and replacement
In the process, under turn on pump state (be pumped not for 0), according to annular pressure lost, liquid column hydrostatic pressure situation by well head annular pressure control
System makes shaft bottom circulation equal yield density between formation pore pressure and formation fracture pressure equal yield density in 0.3~3.8MPa,
Press quietly layer.Under termination of pumping state (i.e. pump pressure be 0), controlled well head annular pressure 0.5 according to liquid column hydrostatic pressure situation~
5.69MPa makes shaft bottom circulation equal yield density between formation pore pressure and formation fracture pressure equal yield density, and pressure is quietly
Layer.
To sum up, it the embodiment of the invention provides a kind of casing pressure control cementing technology, is controlled, is made narrow by well head annular pressure
The corresponding shaft bottom circulation equal yield density of ' Safe Density Windows well section is between formation pore pressure equal yield density and formation fracture pressure
Between equal yield density, it is ensured that do not press leakage pressure-bearing weak formation while pressing steady hydrocarbon show zones position, it is close to substantially reduce narrow safety
The casing cementing construction risk of window well section is spent, realizes near-banlanced cementing, improves cementing quality, improves well integrality, it is ensured that open
Send out benefit.
The above is merely for convenience of it will be understood by those skilled in the art that technical solution of the present invention, not to limit
The present invention.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in this
Within the protection scope of invention.
Claims (6)
1. a kind of casing pressure control well shaft fixing technology, which is characterized in that described sleeve pipe pressure control well shaft fixing technology successively includes: setting of casing rank
Section, cementing and replacement stage, bruising and time solidifying stage；
It in the setting of casing stage, the cementing and replaces stage, the bruising and waits in the solidifying stage, by controlling well head ring
Pneumatics power makes the shaft bottom circulation equal yield density of narrow ' Safe Density Windows well section be maintained at the narrow ' Safe Density Windows well section corresponding
Pore pressure equal yield density and fracture pressure equal yield density between.
2. casing pressure control well shaft fixing technology according to claim 1, which is characterized in that, will be oily in the setting of casing stage
Predeterminated position back seat casing hanger under layer casing lower going-into-well, circulation reduces drilling fluid density and the pressure control by the way that well head is arranged in later
Equipment applies back pressure from well head, controls well head annular pressure, so that the shaft bottom of the narrow ' Safe Density Windows well section is recycled equivalent close
Degree is maintained between the corresponding pore pressure equal yield density of the narrow ' Safe Density Windows well section and fracture pressure equal yield density.
3. casing pressure control well shaft fixing technology according to claim 1, which is characterized in that in the cementing and replace the stage
In, the pressure control equipment by the way that well head is arranged in applies back pressure from well head, controls well head annular pressure, makes the narrow Safe Density window
The shaft bottom circulation equal yield density of mouthful well section be maintained at the corresponding pore pressure equal yield density of the narrow ' Safe Density Windows well section and
Between fracture pressure equal yield density, the back pressure value applied is starched rod structure situation of change according to annular space and is calculated.
4. casing pressure control well shaft fixing technology according to claim 3, which is characterized in that the cementing and replace the stage include
Cementing practice, note mud replace construction and note clear water replaces construction.
5. casing pressure control well shaft fixing technology according to claim 4, which is characterized in that in the bruising and in the Hou Ning stage,
It carries out note clear water and replaces construction to after bruising, require to carry out well head annular space according to special cementing and build the pressure Hou Ning, and according to final
Annular space starches the back pressure value applied needed for rod structure calculates, applies back pressure from well head by the pressure control equipment that well head is arranged in,
Well head annular pressure is controlled, so that the shaft bottom circulation equal yield density of the narrow ' Safe Density Windows well section is maintained at the narrow safety close
It spends between the corresponding pore pressure equal yield density of window well section and fracture pressure equal yield density, after theing cement solidifies, completes well cementation
Construction.
6. described in any item casing pressure control well shaft fixing technologies according to claim 1~5, which is characterized in that described sleeve pipe is seamless
Steel pipe.
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| CN201711030180.8A CN109723402A (en) | 2017-10-30 | 2017-10-30 | Casing pressure control well cementation process |
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Cited By (6)
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| CN110593856A (en) * | 2019-10-21 | 2019-12-20 | 中国石油集团川庆钻探工程有限公司 | Method for measuring density window of well cementation safety operation |
| CN110984903A (en) * | 2019-09-09 | 2020-04-10 | 中国石油天然气股份有限公司 | Well cementing method, well cementing device and storage medium |
| CN111058794A (en) * | 2019-11-26 | 2020-04-24 | 中国石油天然气股份有限公司 | Control method and device for applying back pressure to annulus |
| CN111395965A (en) * | 2020-03-23 | 2020-07-10 | 中国石油天然气集团有限公司 | Safe casing running operation method suitable for easily-leaking stratum |
| CN113338849A (en) * | 2021-07-13 | 2021-09-03 | 中石化石油工程技术服务有限公司 | Well cementation method for high-temperature oil and gas well |
| CN116163673A (en) * | 2023-04-25 | 2023-05-26 | 中国石油大学(华东) | Micro-pressure control device and method for deep water shallow gradient well cementation circulating wellhead |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110984903A (en) * | 2019-09-09 | 2020-04-10 | 中国石油天然气股份有限公司 | Well cementing method, well cementing device and storage medium |
| CN110984903B (en) * | 2019-09-09 | 2022-07-05 | 中国石油天然气股份有限公司 | Well cementing method, well cementing device and storage medium |
| CN110593856A (en) * | 2019-10-21 | 2019-12-20 | 中国石油集团川庆钻探工程有限公司 | Method for measuring density window of well cementation safety operation |
| CN111058794A (en) * | 2019-11-26 | 2020-04-24 | 中国石油天然气股份有限公司 | Control method and device for applying back pressure to annulus |
| CN111395965A (en) * | 2020-03-23 | 2020-07-10 | 中国石油天然气集团有限公司 | Safe casing running operation method suitable for easily-leaking stratum |
| CN111395965B (en) * | 2020-03-23 | 2022-03-01 | 中国石油天然气集团有限公司 | Safe casing running operation method suitable for easily-leaking stratum |
| CN113338849A (en) * | 2021-07-13 | 2021-09-03 | 中石化石油工程技术服务有限公司 | Well cementation method for high-temperature oil and gas well |
| CN113338849B (en) * | 2021-07-13 | 2022-12-30 | 中石化石油工程技术服务有限公司 | Well cementation method for high-temperature oil and gas well |
| CN116163673A (en) * | 2023-04-25 | 2023-05-26 | 中国石油大学(华东) | Micro-pressure control device and method for deep water shallow gradient well cementation circulating wellhead |
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