CN105840184B - Device and method for monitoring and controlling annulus pressure of deep sea seabed wellhead - Google Patents
Device and method for monitoring and controlling annulus pressure of deep sea seabed wellhead Download PDFInfo
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- CN105840184B CN105840184B CN201610424217.4A CN201610424217A CN105840184B CN 105840184 B CN105840184 B CN 105840184B CN 201610424217 A CN201610424217 A CN 201610424217A CN 105840184 B CN105840184 B CN 105840184B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000012530 fluid Substances 0.000 claims abstract description 78
- 239000013589 supplement Substances 0.000 claims abstract 2
- 230000008859 change Effects 0.000 claims description 23
- 238000005192 partition Methods 0.000 claims description 22
- 230000009471 action Effects 0.000 claims description 8
- 230000003139 buffering effect Effects 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims 1
- 230000001681 protective effect Effects 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 4
- 239000008186 active pharmaceutical agent Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000191291 Abies alba Species 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
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- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- 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
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
- E21B33/0355—Control systems, e.g. hydraulic, pneumatic, electric, acoustic, for submerged well heads
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- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
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Abstract
An annular pressure monitoring and controlling device and method to deep sea seabed well head, the apparatus includes installing in the fluid entrance of the bottom of apparatus, have installed the lower piston above the fluid entrance, the lower piston couples to upper piston through the tie rod, install the buffer below the upper piston; a fluid outlet is arranged on the device; a pressure sensor is arranged at the fluid inlet, and the output end of the pressure sensor is connected with the PLC logic control unit and is connected with the upper piston through a power device; when the pressure of the fluid at the fluid inlet is higher than the preset upper limit pressure value, the fluid pushes the lower piston to move upwards, so that the fluid flows out through the fluid outlet to be decompressed; when the annular pressure signal is lower than a preset pressure value, the lower piston presses fluid in the device into the annular space of the sleeve through the fluid inlet to supplement pressure under three conditions of pressure provided by the hydraulic pump, spring elasticity and prepared pressure generated by compressed fluid; the invention has the characteristics of simple structure, convenience, practicability and difficult corrosion.
Description
Technical Field
The invention relates to a wellhead annular pressure control device, in particular to an annular pressure monitoring and control device and method for a deep sea seabed wellhead.
Background
Unlike dry wellhead devices for land and shallow oil and gas fields, deep oil and gas well wellhead devices employ an underwater christmas tree and a casing head. Because deep sea oil gas well casing structure is complicated, form a plurality of airtight annuluses. However, in the development process, the temperature effect causes the expansion of the sealed annular fluid, the annular pressure and the pressure are generated, and the safety of the tubular column and the integrity of the well bore are seriously threatened.
The research at home and abroad aiming at the annular pressure of the oil and gas well casing mainly aims at the high-temperature and high-pressure well in land and shallow water, the research on the annular pressure of the deep water well casing is less, and related documents are also mainly used for researching the annular pressure management measures of the casing. Due to the particularity of the submarine casing head device, the pressure relief and pressure compensation control can be performed on the annulus pressure A only through a 1/2 inch pipeline, and the annulus pressures B, C and D cannot be monitored and controlled, and the method is easy to cause pipeline blockage and cause misjudgment; the existing device can not test the sealing performance and integrity of the annular space according to the API RP 90 operation flow; when large discharge injection operation is carried out, annular liquid is contracted to cause annular pressure to drop, so that vacuum is generated in the annular, oxygen is sucked in, and corrosion is caused.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an annular pressure monitoring and controlling device for a deep sea seabed wellhead, which can effectively solve the problem of misjudgment caused by pipeline blockage and has the characteristics of simple operation structure, convenience, practicability and difficult corrosion.
In order to achieve the purpose, the invention adopts the following technical scheme:
an annular pressure monitoring and controlling device for a deep sea seabed wellhead comprises a fluid inlet 1 arranged at the bottom of the device, a lower piston 8 is arranged above the fluid inlet 1, the lower piston 8 is connected with an upper piston 6 through a connecting rod 7, a buffering device is arranged below the upper piston 6, and a spring 12 is connected between the buffering device and the lower piston 8; a fluid outlet 13 is arranged at the side of the device corresponding to the spring 12; the fluid inlet 1 is provided with a pressure sensor 2, the output end of the pressure sensor 2 is connected with a PLC logic control unit 3, and the output end of the PLC logic control unit 3 is connected with an upper piston 6 through a power device.
The power device comprises an input end of a hydraulic pump 4 connected with an output end of the PLC logic control unit 3, an output end of the hydraulic pump 4 is connected with a hydraulic cylinder 5, and a piston 6 is arranged in the hydraulic cylinder 5.
The buffer device comprises a fixed clapboard 9 and a movable clapboard 11 which are sequentially arranged below the upper piston 6, and compressed fluid 10 is arranged between the fixed clapboard 9 and the movable clapboard 11; a spring 12 is connected below the movable partition 11.
An annular pressure monitoring and control method for a deep sea seabed wellhead comprises the following steps:
1. monitoring the annular temperature and pressure:
the pressure sensor 2 detects the pressure at the fluid inlet 1 in real time, and the pressure sensor 2 transmits a pressure signal to the logic control unit 3; logic control unit 3 for temperature T a Processing the measured value of the pressure P, and setting the upper limit value of the pressure obtained by calculation as P max Wherein the annular pressure change value P is caused by the annular temperature rise T Annular pressure reduction value P caused by annular volume change V Then, P max ＝P T -P V ；
The thermal expansion coefficient of the annular fluid is alpha, the compression coefficient of the annular fluid is kappa, and the effective temperature variation T of the annular fluid of the temperature sensor part a The amount of change P of the annular pressure caused by the temperature change T ：
An annular volume V is formed between the inner-layer pipe column 19 and the outer-layer pipe column 14, the annular volume change is delta V under the action of temperature and internal and external pressure, and then the annular pressure change P caused by the annular volume change V ：
An empty volume V is formed between the inner layer pipe column 19 and the outer layer pipe column 14, and the outer diameter of the inner layer pipe column 19 is D a The inner diameter of the outer tubular string 14 is d b And the length from the inner pipe column 19 to the packer is L, so the annular volume V is as follows:
an empty volume is V formed between the inner layer pipe column 19 and the outer layer pipe column 14, and the outer diameter of the inner layer pipe column 19 is D a The inner diameter of the outer string 14 is d b And the length from the inner pipe column 19 to the packer is L, then the annular volume change quantity delta V is as follows:
when the inner tubular column 19 and the outer tubular column 14 form an annular volume V, the elastic modulus E and the Poisson coefficient of the tubular product are mu, and the internal pressure of the inner tubular column 19 is p i The external pressure of the outer tubular column 14 is p o The annular pressure is p; the outer diameter of the inner tubular column 19 is D a Inner diameter of d a The outer diameter of the outer tubular string 14 is D b The inner diameter of the outer tube is d b If the length from the inner pipe column 19 to the packer is L, the radial displacement delta d of the casing pipe under the action of internal and external pressure b And Δ D a Comprises the following steps:
the annulus maximum pressure pmax can be calculated by measuring the annulus pressure and temperature;
2. automatic pressure relief:
when the pressure of the fluid at the fluid inlet 1 is higher than the preset upper limit pressure value P max When the pressure is released, the fluid pushes the lower piston 8 to move upwards, so that the fluid flows out through the fluid outlet 13 to release the pressure; the lower piston 8 compresses the spring 12 while moving upwards, and the spring 12 enables the movable partition plate 11 to move upwards to transmit partial pressure to the compressed fluid 10, so that the annular pressure is buffered, and the safety of the sleeve is protected;
3. pressure supplementing: the pressure sensor 2 detects the pressure at the fluid inlet 1 in real time, the pressure sensor 2 transmits a pressure signal to the logic control unit 3, the logic control unit 3 compares the pressure signal with a preset lower limit pressure value to control the hydraulic pump 4, when the annular pressure signal is lower than the preset pressure value, the hydraulic pump 4 is started to enable the hydraulic cylinder 5 to work, the hydraulic cylinder 5 pushes the upper piston 6 to move downwards, the upper piston 6 is connected with the connecting rod 7 and the lower piston 8, the connecting rod 7 pushes the lower piston 8 to move downwards, the lower piston 8 enables the spring 12 arranged between the movable partition plate 11 and the lower piston 8 to stretch downwards, the spring 12 pulls the movable partition plate 11 downwards, the compressed fluid 10 is arranged between the movable partition plate 11 and the fixed partition plate 9, and under the three conditions of the pressure provided by the hydraulic pump 4, the elastic force of the spring 12 and the backup pressure generated by the compressed fluid, the lower piston 8 can press the fluid in the device into the annular space of the casing through the fluid inlet 1 under the combined action, so that the pressure is supplemented; and when the annular pressure signal reaches a preset lower limit pressure value, the logic control unit 3 controls the hydraulic pump 4 to be closed and stops pressure compensation.
Compared with the prior art, the invention has the following advantages:
1. the invention can monitor and control the seabed wellhead annulus in real time, realize the automatic pressure relief function and reduce the labor intensity of personnel.
2. The invention can realize the casing annulus sealing performance and integrity test specified in API RP 90 standard. And when the large-displacement injection operation is carried out, the annular pressure of the casing can be supplemented, the safety coefficient of the oil casing in the operation process is improved, and the integrity of the shaft is ensured.
3. The invention uses the spring-fluid pressure system as a pressure buffer structure, thereby obviously improving the response speed of the system.
Drawings
Fig. 1 is a schematic diagram of the structure of the present invention.
FIG. 2 is a schematic view of the annular pressure monitoring and control device and the installation position of the subsea casing head.
Detailed Description
The invention is further described with reference to the following drawings and detailed description:
as shown in fig. 1: an annular pressure monitoring and controlling device for a deep sea seabed wellhead comprises a fluid inlet 1 arranged at the bottom of the device, a lower piston 8 is arranged above the fluid inlet 1, the lower piston 8 is connected with an upper piston 6 through a connecting rod 7, a buffering device is arranged below the upper piston 6, and a spring 12 is connected between the buffering device and the lower piston 8; a fluid outlet 13 is arranged at the side of the device corresponding to the spring 12; the fluid inlet 1 is provided with a pressure sensor 2, the output end of the pressure sensor 2 is connected with a PLC (programmable logic controller) unit 3, and the output end of the PLC unit 3 is connected with an upper piston 6 through a power device.
The power device comprises a hydraulic pump 4 connected with the output end of the PLC logic control unit 3, the output end of the hydraulic pump 4 is connected with a hydraulic cylinder 5, and an upper piston 6 is arranged in the hydraulic cylinder 5.
The buffer device comprises a fixed partition plate 9 and a movable partition plate 11 which are sequentially arranged below the upper piston 6, and compressed fluid 10 is arranged between the fixed partition plate 9 and the movable partition plate 11; a spring 12 is connected below the movable partition 11.
The pressure sensor 2 is used for detecting the annular pressure of the casing pipe of the subsea wellhead in real time and generating a corresponding annular pressure signal.
The fluid outlet 13 is used for discharging fluid through the pressure relief opening when the pressure at the inlet is higher than a preset upper pressure limit value, so as to perform pressure relief.
The PLC logic control unit 3 is used for receiving a pressure signal of the pressure sensor 2, comparing the received pressure signal with a preset lower limit pressure value, when the annular pressure signal is lower than the preset lower limit pressure value, pressing fluid in the device into the annular space of the sleeve through a pressurization mechanism (a hydraulic pump, a hydraulic cylinder, a piston, a connecting rod, a fixed partition plate, compressed fluid and a spring), pressurizing, and closing the pressurization mechanism until the annular pressure signal reaches the preset lower limit pressure value, and stopping pressure compensation.
As shown in fig. 2: the casing head 17 is divided into an upper part and a lower part, an annular pressure monitoring and controlling device is additionally arranged in the middle of the casing head 17, the upper casing head, the annular pressure monitoring and controlling device and the lower casing head are connected through a connecting flange 16, an outer pipe column 14 and an inner pipe column 19 are respectively arranged on the inner side of the casing head 17, and an outer pipe column hanger 15 and an inner pipe column hanger 18 are respectively arranged at the contact positions of the outer pipe column 14 and the inner pipe column 19 with the casing head 17.
An annular pressure monitoring and control method for a deep sea seabed wellhead comprises the following steps:
1. monitoring the annular temperature and pressure:
the pressure sensor 2 detects the pressure at the fluid inlet 1 in real time, and the pressure sensor 2 transmits a pressure signal to the logic control unit 3; logic control unit 3 for temperature T a Processing the measured value of the pressure P, and setting the upper limit value of the pressure obtained by calculation as P max Wherein the annular pressure change value P is caused by the annular temperature rise T Annular pressure reduction value P caused by annular volume change V Then, P max ＝P T -P V ；
The thermal expansion coefficient of the annular fluid is alpha, the compression coefficient of the annular fluid is kappa, and the effective temperature variation T of the annular fluid of the temperature sensor part a The amount of change P of the annular pressure caused by the temperature change T ：
An empty volume is formed between the inner layer pipe column 19 and the outer layer pipe column 14V, the annular volume change is delta V under the action of temperature and internal and external pressure, and then the annular pressure change P caused by the annular volume change V ：
An empty volume V is formed between the inner layer pipe column 19 and the outer layer pipe column 14, and the outer diameter of the inner layer pipe column 19 is D a The inner diameter of the outer string 14 is d b And the length from the inner pipe column 19 to the packer is L, so the annular volume V is as follows:
an empty volume V is formed between the inner layer pipe column 19 and the outer layer pipe column 14, and the outer diameter of the inner layer pipe column 19 is D a The inner diameter of the outer tubular string 14 is d b And the length from the inner pipe column 19 to the packer is L, then the annular volume change quantity delta V is as follows:
when the inner tubular column 19 and the outer tubular column 14 form an annular volume V, the elastic modulus E and the Poisson coefficient of the tubular product are mu, and the internal pressure of the inner tubular column 19 is p i The external pressure of the outer tubular string 14 is p o The annular pressure is p; the outer diameter of the inner tubular column 19 is D a Inner diameter of d a The outer diameter of the outer tubular string 14 is D b The inner diameter of the outer tube is d b And the length from the inner pipe column 19 to the packer is L, the radial displacement delta d of the casing pipe is generated under the action of internal pressure and external pressure b And Δ D a Comprises the following steps:
the annulus maximum pressure pmax can be calculated by measuring the annulus pressure and temperature;
2. automatic pressure relief:
when the pressure of the fluid at the fluid inlet 1 is higher than the preset upper limit pressure value P max When the pressure is released, the fluid pushes the lower piston 8 to move upwards, so that the fluid flows out through the fluid outlet 13 to release the pressure; the lower piston 8 compresses the spring 12 while moving upwards, and the spring 12 enables the movable partition plate 11 to move upwards to transmit partial pressure to the compressed fluid 10, so that the annular pressure is buffered, and the safety of the sleeve is protected;
3. pressure supplementing: the pressure sensor 2 detects the pressure at the fluid inlet 1 in real time, the pressure sensor 2 transmits a pressure signal to the logic control unit 3, the logic control unit 3 compares the pressure signal with a preset lower limit pressure value to control the hydraulic pump 4, when the annular pressure signal is lower than the preset pressure value, the hydraulic pump 4 is started to enable the hydraulic cylinder 5 to work, the hydraulic cylinder 5 pushes the upper piston 6 to move downwards, the upper piston 6 is connected with the connecting rod 7 and the lower piston 8, the connecting rod 7 pushes the lower piston 8 to move downwards, the lower piston 8 enables the spring 12 arranged between the movable partition plate 11 and the lower piston 8 to stretch downwards, the spring 12 pulls the movable partition plate 11 downwards, the compressed fluid 10 is arranged between the movable partition plate 11 and the fixed partition plate 9, and under the three conditions of the pressure provided by the hydraulic pump 4, the elastic force of the spring 12 and the backup pressure generated by the compressed fluid, the lower piston 8 can press the fluid in the device into the annular space of the casing through the fluid inlet 1 under the combined action, so that the pressure is supplemented; and when the annular pressure signal reaches a preset lower limit pressure value, the logic control unit 3 controls the hydraulic pump 4 to be closed and stops pressure compensation.
Claims (2)
1. An annular pressure monitoring and controlling device for a deep sea seabed wellhead is characterized by comprising a fluid inlet (1) arranged at the bottom of the device, a lower piston (8) is arranged above the fluid inlet (1), the lower piston (8) is connected with an upper piston (6) through a connecting rod (7), a buffering device is arranged below the upper piston (6), and a spring (12) is connected between the buffering device and the lower piston (8); a fluid outlet (13) is arranged at the side surface of the device corresponding to the spring (12); a pressure sensor (2) is installed at the fluid inlet (1), the output end of the pressure sensor (2) is connected with a PLC (programmable logic controller) unit (3), and the output end of the PLC unit (3) is connected with an upper piston (6) through a power device;
the power device comprises a hydraulic pump (4) connected with the output end of the PLC logic control unit (3), the output end of the hydraulic pump (4) is connected with a hydraulic cylinder (5), and an upper piston (6) is arranged in the hydraulic cylinder (5);
the buffer device comprises a fixed clapboard (9) and a movable clapboard (11) which are sequentially arranged below the upper piston (6), and compressed fluid (10) is arranged between the fixed clapboard (9) and the movable clapboard (11); a spring (12) is connected below the movable clapboard (11).
2. The method for monitoring and controlling the annulus pressure monitoring and controlling device for the deep sea seabed wellhead as claimed in claim 1, comprises the following steps:
1. monitoring the annular temperature and pressure:
the pressure sensor (2) detects the pressure at the fluid inlet (1) in real time, and the pressure sensor (2) transmits a pressure signal to the logic control unit (3); logic control unit (3) for temperature T a Processing the measured value of the pressure P, and setting the upper limit value of the pressure obtained by calculation as P max Wherein the annular pressure change value P is caused by the annular temperature rise T Annular pressure reduction value P caused by annular volume change V Then, P max ＝P T -P V ；
The thermal expansion coefficient of the annular fluid is alpha, the compression coefficient of the annular fluid is kappa, and the effective temperature change T of the annular fluid a The amount of change P of the annular pressure caused by the temperature change T ：
An annular volume V is formed between the inner layer pipe column (19) and the outer layer pipe column (14), the annular volume change is delta V under the action of temperature and internal and external pressure, and then the annular volume changesChange amount P of annular pressure caused by chemical reaction V ：
An annular space with a volume of V is formed between the inner layer pipe column (19) and the outer layer pipe column (14), and the outer diameter of the inner layer pipe column (19) is D a The inner diameter of the outer layer pipe column (14) is d b And the length from the inner layer pipe column (19) to the packer is L, then the annular volume V:
an empty volume V is formed between the inner layer pipe column (19) and the outer layer pipe column (14), and the outer diameter of the inner layer pipe column (19) is D a The inner diameter of the outer layer pipe column (14) is d b And the length from the inner layer pipe column (19) to the packer is L, then the annular volume change quantity delta V is as follows:
in the case that the inner layer string (19) and the outer layer string (14) form a hollow volume V, the elastic modulus E and the Poisson coefficient of the pipe are mu, and the internal pressure of the inner layer string (19) is p i The external pressure of the outer layer pipe column (14) is p o The annular pressure is p; the outer diameter of the inner layer pipe column (19) is D a Inner diameter of d a The outer diameter of the outer layer pipe column (14) is D b The inner diameter of the outer layer pipe column (14) is d b And the length from the inner layer pipe column (19) to the packer is L, the radial displacement of the outer layer pipe column under the action of internal pressure and external pressure is delta d b And the radial displacement of the inner string is Δ D a ：
Calculating the maximum pressure pmax of the annulus by measuring the pressure and the temperature of the annulus;
2. automatic pressure relief:
when the pressure of the fluid at the fluid inlet (1) is higher than the preset upper limit pressure value P max When the pressure relief valve is used, the fluid pushes the lower piston (8) to move upwards, so that the fluid flows out through the fluid outlet (13) to relieve pressure; the lower piston (8) moves upwards and compresses the spring (12), the spring (12) enables the movable partition plate (11) to move upwards and transmits partial pressure to the compressed fluid (10), and therefore the annular pressure is buffered, and the protective sleeve is safe;
3. pressure supplementing: the pressure sensor (2) detects the pressure at the fluid inlet (1) in real time, the pressure sensor (2) transmits a pressure signal to the logic control unit (3), the logic control unit (3) compares the pressure signal with a preset lower limit pressure value to control the hydraulic pump (4), when the annular pressure signal is lower than the preset pressure value, the hydraulic pump (4) is started to enable the hydraulic cylinder (5) to work, the hydraulic cylinder (5) pushes the upper piston (6) to move downwards, the upper piston (6) is connected with the connecting rod (7) and the lower piston (8), the connecting rod (7) pushes the lower piston (8) to move downwards, the lower piston (8) enables a spring (12) arranged between the movable partition plate (11) and the lower piston (8) to stretch downwards, the spring (12) pulls the movable partition plate (11) downwards, a compressed fluid (10) is arranged between the movable partition plate (11) and the fixed partition plate (9), and under the three conditions of pressure provided by the hydraulic pump (4), the elastic force of the spring (12) and the prepared pressure generated by the compressed fluid, the lower piston (8) is enabled to be pressed into the fluid inlet through the fluid casing (1) so as to supplement the annular pressure; and when the annular pressure signal reaches a preset lower limit pressure value, the logic control unit (3) controls to close the hydraulic pump (4) and stop pressure compensation.
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| CN107420091B (en) * | 2017-07-25 | 2023-05-16 | 西安石油大学 | Annular pressure monitoring and controlling device for deep water oil-gas well |
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| CN108643886B (en) * | 2018-04-24 | 2022-02-11 | 中国海洋石油集团有限公司 | Deep well annulus trapping pressure monitoring device and method |
| CN108843272B (en) * | 2018-06-19 | 2020-06-30 | 中国海洋石油集团有限公司 | Recoverable pressure relief tool for releasing annular confining pressure and well completion well structure |
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| CN111964887B (en) * | 2020-08-17 | 2022-04-12 | 西南石油大学 | Casing annulus pressure relief tool simulation experiment device and test method |
| CN113530526B (en) * | 2021-08-05 | 2022-03-15 | 南方海洋科学与工程广东省实验室(广州) | Underground long-period fluid flux monitoring device and method |
| CN113622873A (en) * | 2021-08-06 | 2021-11-09 | 中海石油(中国)有限公司湛江分公司 | Deepwater gas well annulus pressure intelligent management device and method |
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