CN113123742B - Well control system and method for offshore high-temperature high-pressure narrow safety density window well - Google Patents
Well control system and method for offshore high-temperature high-pressure narrow safety density window well Download PDFInfo
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- CN113123742B CN113123742B CN202110438646.8A CN202110438646A CN113123742B CN 113123742 B CN113123742 B CN 113123742B CN 202110438646 A CN202110438646 A CN 202110438646A CN 113123742 B CN113123742 B CN 113123742B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
Abstract
The invention discloses a well control system and method for an offshore high-temperature high-pressure narrow safety density window well. The invention sets a testing blowout prevention manifold to release the pressure of oil gas discharged from the existing well killing high-pressure manifold connected to a platform, so that the annular casing pressure in the well is kept stable, specifically, square pressure is performed through two circulation modes, firstly, the well killing high-pressure manifold releases the pressure through a testing ground safety valve, a power oil nozzle, a manual oil nozzle, an oil-gas separator and a slurry pool in sequence, and the other well killing high-pressure manifold releases the pressure through the testing ground safety valve, the power oil nozzle, the manual oil nozzle, a testing separator, a combustion arm and the slurry pool in sequence, and selection is performed according to different pressure fluctuations, so that the stability of the annular casing pressure can be rapidly and effectively ensured, and safe and stable well killing is realized.
Description
Technical Field
The invention belongs to the technical field of marine high-temperature high-pressure drilling, and particularly relates to a well control system and method for a marine high-temperature high-pressure narrow safe density window well.
Background
The geological conditions of deep reservoirs in the south sea orizonum basin are complex and are one of high-temperature and high-pressure areas on the three seas in the world. Along with the continuous deepening of the high-temperature and high-pressure oil and gas exploration degree of the origosum agar basin, the bottom hole temperature is over 200 ℃, the bottom hole pressure is over 100MPa, the operation safety density window is basically less than 0.1, and the situations of overflow, well kick and the like in the drilling process are frequent. If overflow occurs, the casing pressure of a plurality of high-temperature high-pressure wells in the early warhead agar basin exceeds 3000psi in the killing operation, the casing pressure fluctuation of a well control system carried by a platform in the killing operation is large generally, the casing pressure fluctuation is 100-300 psi in the killing process, the safe density window of the high-temperature high-pressure well is narrow, the large casing pressure fluctuation in the killing process is easy to leak the stratum, the situation is worsened, and the blowout accident is easy to cause. On the other hand, because the well control problem of the high-temperature and high-pressure well is generally processed for a long time, the pressure of the stratum is high, the stratum is hollowed out more or the overflow amount is large, so that the casing pressure is high, the annular high-density drilling fluid has high pressure and flow rate, the solid content of the high-density drilling fluid is high, and under the condition of long-time high solid phase and high flow rate of the drilling fluid, the drilling fluid easily causes puncture and damage to a hydraulic needle valve (also called a hydraulic throttling valve) for adjusting the casing pressure, so that the well condition is further worsened, the requirement on the well control of the ocean high-temperature and high-pressure drilling operation is extremely high, and once the well is out of control, the ship is damaged, and people die. At present, the sleeve pressure is mostly adjusted by a throttle valve, for example, chinese patent No. CN106246146B, publication No. 2019.6.18: the utility model provides a choke manifold with adjustable, this patent is through the mode of adjusting fixed glib talker, avoids the problem of the easy loss of conventional glib talker, but to the requirement of ocean high temperature high pressure drilling operation, the undulant problem of casing pressure can not effectively be solved fast to this patent, can not effectively release pressure, prevents the blowout.
Disclosure of Invention
The invention provides a well control system and method for an offshore high-temperature high-pressure narrow-safety-density window well, which can ensure that the pressure of an annular sleeve is kept stable in the throttling circulating well killing process of a high-temperature high-pressure well and realize safe and stable well killing.
The technical scheme of the invention is as follows:
a well control system of an offshore high-temperature high-pressure narrow-safety-density window well comprises a test blowout prevention manifold and a kill high-pressure manifold, wherein the test blowout prevention manifold comprises a test ground safety valve, a power oil nozzle, a manual oil nozzle, an oil-gas separator, a test separator, a mud pit and a combustion arm;
and connecting the test blowout prevention manifold into the kill high-pressure manifold, wherein the specific connection structure is as follows: the oil gas outlet of the kill high-pressure manifold is connected with the input end of the test ground safety valve through a connecting pipeline, the output end of the test ground safety valve is connected with the input end of the power oil nozzle through a connecting pipeline, the output end of the power oil nozzle is connected with the input end of the manual oil nozzle through a connecting pipeline, the output end of the manual oil nozzle is connected with a three-way pipe fitting through a connecting pipeline, and is respectively connected with the input end of the test separator and the input end of the oil-gas separator through a three-way pipe fitting, control valves are arranged on two sides of the three-way pipe fitting, the gas output end of the test separator is connected with the combustion arm through a connecting pipeline, the liquid output end of the test separator is connected with the mud pit through a connecting pipeline, the gas output end of the oil-gas separator is connected with a blowout pipeline, and the liquid output end of the oil-gas separator is connected with the mud pit through a connecting pipeline.
The invention sets a testing blowout prevention manifold to release pressure of oil gas discharged from the existing well killing high-pressure manifold connected to a platform, so that annular casing pressure in a well is kept stable, specifically, the release pressure is performed through two circulation modes, firstly, the well killing high-pressure manifold sequentially passes through a testing ground safety valve, a power oil nozzle, a manual oil nozzle, an oil-gas separator and a mud pit to release pressure, and the other one of the well killing high-pressure manifold sequentially passes through the testing ground safety valve, the power oil nozzle, the manual oil nozzle, a testing separator, a combustion arm and the mud pit to release pressure, and the selection is performed according to different pressure fluctuations, so that the stability of the annular casing pressure can be rapidly and effectively ensured, and safe and stable well killing can be realized.
Further, the test ground safety valve is provided with a warning lamp. The test ground relief valve is used for detecting whether the process after takes place to leak, can realize emergency shutdown, prevents that oil gas from further revealing, wherein when taking place to leak, warns through the warning light.
Furthermore, the power oil nozzle realizes remote operation of the opening degree of the oil nozzle through hydraulic control, and the opening degree of the oil nozzle can be kept stable.
Furthermore, the choke valve of the power choke is made of tungsten carbide, and has good erosion resistance.
Further, the manual glib talker adopts five valve modular structure, and wherein five valves all adopt the slide valve, can be through the manual regulation glib talker size of slide valve, glib talker aperture can remain stable.
Further, a temperature and pressure sensor and a chemical injection device are arranged on the manual oil nozzle. Can add temperature pressure sensor on manual glib talker and be used for detecting the real-time temperature and the pressure of glib talker to can also increase chemical injection device and be used for pouring into chemical into the glib talker, handle oil gas.
Furthermore, a sampling port is arranged on the manual oil nozzle, and fluid sampling is carried out through the sampling port.
Further, the test separator adopts a horizontal separator. The test separator can realize three-phase separation of oil, gas and water, has large treatment capacity, is a high-pressure closed liquid-gas separator, and preferably adopts a bedroom separator.
Furthermore, all connecting pipelines are high-pressure pipelines, and the high-pressure pipelines are adopted, so that the pipelines are prevented from bursting, and the safety is improved.
The invention also provides a well control method of the offshore high-temperature high-pressure narrow safe density window well, wherein the test blowout prevention manifold is connected into the kill high-pressure manifold, the blowout preventer is closed after the well control event of the offshore drilling, the kill high-pressure manifold is communicated to the test blowout prevention manifold, and the annular casing pressure of the throttling circulation kill annulus is controlled through the test blowout prevention manifold, and the specific process is as follows;
when the annulus casing pressure of the kill high-pressure manifold is higher than the threshold value, the control flow is as follows:
oil gas of a kill high-pressure manifold is conveyed to a test ground safety valve through a connecting pipe fitting, the oil gas is conveyed to a power oil nozzle through the test ground safety valve through the connecting pipe fitting, the oil gas is conveyed to a manual oil nozzle through the connecting pipe fitting, the manual oil nozzle is conveyed to a three-way pipe fitting through the connecting pipe fitting, a control valve on the connecting pipe fitting of the three-way pipe fitting, which is communicated with an oil-gas separator, is closed, a control valve on the connecting pipe fitting of the other side, which is communicated with a test separator, is opened, the oil gas is further conveyed to the test separator, the oil gas is separated by the test separator, the separated gas is conveyed to a combustion arm through the connecting pipe fitting for combustion, and separated liquid is recycled to a mud pit through the connecting pipe fitting, so that pressure release is realized, and the pressure stability of an annular sleeve is kept;
when the annulus casing pressure of the kill high-pressure manifold is lower than the threshold value, the control flow is as follows:
the oil gas of the kill-job high-pressure manifold is conveyed to a test ground safety valve through a connecting pipe fitting, the oil gas is conveyed to a power oil nozzle by the test ground safety valve through the connecting pipe fitting, the oil gas is conveyed to a manual oil nozzle through the connecting pipe fitting by the power oil nozzle, the manual oil nozzle is conveyed to a three-way pipe fitting through the connecting pipe fitting, a control valve on the connecting pipe fitting of the three-way pipe fitting communicated with a test separator is closed, a control valve on the connecting pipe fitting of the other side communicated with an oil-gas separator is opened, the oil gas is further conveyed to the oil-gas separator, the oil gas is separated by the oil-gas separator, the separated gas is discharged through a blowout pipeline, the separated liquid is recovered to a mud pit through the connecting pipeline, the pressure release is realized, and the pressure stability of an annulus casing is kept.
The invention has the beneficial effects that:
1. the well control system is provided with two sets of power oil nozzles and manual oil nozzles, so that the change of an oil nozzle hydraulic valve of the blowout prevention manifold is tested more quickly and conveniently, the existing drill floor hydraulic needle valve needs to be closed after being punctured to isolate pressure of a manual flat valve on the upper path, the needle valve is replaced or repaired, and the manual flat valve cannot be manually closed under the condition of high casing pressure.
2. Under the condition of high casing pressure, drilling fluid and a large amount of overflow fluid passing through the power oil nozzle can enter a test separator of a test blowout prevention manifold, separated gas causes a combustion arm to burn, and liquid can be directly discharged into a mud pit to be recovered; if the casing pressure is low, drilling fluid and a large amount of overflow fluid enter an oil-gas separator according to a normal flow, separated gas is directly discharged, and liquid can be discharged into a mud pit for recycling; through the two circulation paths, the pressure can be quickly and effectively released, the pressure stability of the annular sleeve is kept, and the operation risk is greatly reduced.
3. The opening control of the power oil nozzle and the manual oil nozzle on the blowout prevention manifold is more precise in testing, particularly the manual oil nozzle can be finely adjusted, the fluctuation of casing pressure is very small under the same condition, and the risk of stratum leakage is greatly reduced.
Drawings
FIG. 1 is a schematic diagram of the configuration of the well control system of the present invention;
in the figure: the device comprises a test ground safety valve 1, a power oil nozzle 2, a manual oil nozzle 3, an oil-gas separator 4, a test separator 5, a mud pit 6, a combustion arm 7, a three-way pipe fitting 8 and a control valve 9.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the present embodiments, certain elements of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
Example 1:
as shown in fig. 1, the well control system for the offshore high-temperature high-pressure narrow-safety-density window well comprises a test blowout prevention manifold and a kill high-pressure manifold, wherein the test blowout prevention manifold comprises a test ground safety valve 1, a power oil nozzle 2, a manual oil nozzle 3, an oil-gas separator 4, a test separator 5, a mud pit 6 and a combustion arm 7;
the test blowout prevention manifold is connected into a kill-job high-pressure manifold, and the specific connection structure is as follows: the oil gas outlet of the kill high-pressure manifold is connected with the input end of a test ground safety valve 1 through a connecting pipeline, the output end of the test ground safety valve 1 is connected with the input end of a power oil nozzle 2 through a connecting pipeline, the output end of the power oil nozzle 2 is connected with the input end of a manual oil nozzle 3 through a connecting pipeline, the output end of the manual oil nozzle 3 is connected with a three-way pipe fitting 8 through a connecting pipeline, the input end of a test separator 5 and the input end of an oil-gas separator 4 are respectively connected through the three-way pipe fitting 8, wherein control valves 9 are arranged on two sides of the three-way pipe fitting 8, the gas output end of the test separator 5 is connected with a combustion arm 7 through a connecting pipeline, the liquid output end of the test separator 5 is connected with a mud pit 6 through a connecting pipeline, the gas output end of the oil-gas separator 4 is connected with a blowout pipeline, and the liquid output end of the oil-gas separator 4 is connected with the mud pit 6 through a connecting pipeline.
In this embodiment, the kill high pressure manifold is an oil and gas manifold belonging to an existing well control device, and will not be described herein.
In this embodiment, whether test ground relief valve 1 is used for the process after the detection to leak, can realize emergency shutdown, prevents that oil gas from further leaking, wherein when leaking, warns through the warning light.
In the embodiment, the power oil nozzle 2 realizes remote operation of the opening of the oil nozzle through hydraulic control, the opening of the oil nozzle can be kept stable, and the oil nozzle throttle valve of the power oil nozzle 2 is made of tungsten carbide and has good erosion resistance.
In this embodiment, the manual glib 3 adopts five valve modular structure, and wherein five valves all adopt the slide valve, can be through the manual regulation glib size of slide valve, glib opening ability remain stable. The manual oil nozzle 3 can be also connected with a temperature and pressure sensor, a chemical injection device and the like, the temperature and pressure sensor is used for detecting the real-time temperature and pressure of the oil nozzle, and the chemical injection device is used for injecting chemical substances into the oil nozzle and treating oil gas; a sampling port can be arranged, and fluid sampling can be carried out through the sampling port.
In the present embodiment, the test separator 5 can realize three-phase separation of oil, gas and water, has a large treatment capacity, is a high-pressure sealed liquid-gas separator, and preferably adopts a bedroom separator.
In this embodiment, all the connecting pipelines are high-pressure pipelines, and the high-pressure pipelines are adopted, so that the pipelines are prevented from bursting, and the safety is improved.
The invention also provides a well control method of the offshore high-temperature high-pressure narrow safe density window well, wherein the test blowout control manifold is connected into the kill high-pressure manifold, the blowout preventer is closed after the well control event of the offshore drilling, the kill high-pressure manifold is conducted to the test blowout prevention manifold, and the annular casing pressure of the throttling circulation kill annulus is controlled through the test blowout prevention manifold, and the specific process is as follows;
when the annulus casing pressure of the kill high-pressure manifold is higher than the threshold value, the control flow is as follows:
oil gas of a kill pressure manifold is conveyed to a test ground safety valve 1 through a connecting pipe fitting, the oil gas is conveyed to a power oil nozzle 2 by the test ground safety valve 1 through the connecting pipe fitting, the oil gas is conveyed to a manual oil nozzle 3 through the connecting pipe fitting by the power oil nozzle 2, the manual oil nozzle 3 is conveyed to a three-way pipe fitting 8 through the connecting pipe fitting, a control valve 9 on the connecting pipe fitting, which is communicated with an oil-gas separator 4, of the three-way pipe fitting 8 is closed, a control valve 9 on the connecting pipe fitting, which is communicated with a test separator 5, of the other side is opened, the oil gas is further conveyed to the test separator 5, then the oil gas is separated by the test separator 5, the separated gas is conveyed to a combustion arm 7 through the connecting pipe fitting for combustion, the separated liquid is recycled to a slurry pond 6 through the connecting pipe fitting, so that the pressure is released, and the pressure of an annulus sleeve is kept stable;
when the annulus casing pressure of the kill high-pressure manifold is lower than the threshold value, the control flow is as follows:
the oil gas of the kill high-pressure manifold is conveyed to a test ground safety valve 1 through a connecting pipe fitting, the oil gas is conveyed to a power oil nozzle 2 through the test ground safety valve 1 through the connecting pipe fitting, the oil gas is conveyed to a manual oil nozzle 3 through the connecting pipe fitting by the power oil nozzle 2, the manual oil nozzle 3 is conveyed to a three-way pipe fitting 8 through the connecting pipe fitting, a control valve 9 on the connecting pipe fitting of a test separator 5 communicated with the three-way pipe fitting 8 is closed, a control valve 9 on the connecting pipe fitting of the oil-gas separator 4 communicated with the other side is opened, the oil gas is conveyed to the oil-gas separator 4, the oil gas is separated by the oil-gas separator 4, the separated gas is discharged through a blowout pipeline, the separated liquid is recycled to a mud pit 6 through the connecting pipeline, so that the pressure is released, and the pressure stability of an annulus sleeve is kept.
The invention sets a testing blowout manifold to release oil gas discharged from the existing well killing high-pressure manifold connected to a platform, so that annular casing pressure in a well is kept stable, specifically, the release is performed through two circulation modes, firstly, the well killing high-pressure manifold sequentially passes through a testing ground safety valve 1, a power oil nozzle 2, a manual oil nozzle 3, an oil-gas separator 4 and a mud pit 6 to release pressure, and the other one passes through the testing ground safety valve 1, the power oil nozzle 2, the manual oil nozzle 3, a testing separator 5, a combustion arm 7 and the mud pit 6 to release pressure, and the selection is performed according to different pressure fluctuations, so that the stability of annular casing pressure can be rapidly and effectively ensured, the operation risk is greatly reduced, and safe and stable well killing is realized.
Aiming at the situation that the needle valve is replaced or repaired after the prior drill floor hydraulic needle valve needs to be closed to isolate pressure by a manual flat valve after being punctured, and the manual flat valve can not be manually closed under the condition of high casing pressure, the power oil nozzle 2 and the manual oil nozzle 3 can effectively avoid the situations and improve the operation stability of well control.
For example, a certain high-temperature and high-pressure gas well in a Yingqiong basin is drilled to 4000m and overflows, the well is closed immediately on site, the casing pressure rises to 9000psi, the drilling fluid density is 2.20g/cm & lt 3 & gt during drilling, and the safety density window is only 0.04g/cm & lt 3 & gt. The throttling circulation is carried out through the hydraulic control needle type throttling valve of the drill floor well killing manifold on site, the fine control of the casing pressure is difficult to maintain, the casing pressure fluctuation is serious, the fluctuation range is usually larger than 150psi, the well leakage occurs during the throttling circulation, and the well leakage is caused mainly because the large pressure fluctuation exists when the throttling circulation is carried out through the hydraulic control needle type throttling valve of the drill floor well killing manifold, so that the underground condition is more complicated. After the test blowout control manifold is connected to the field according to the flow, because the casing pressure is higher and the annular air volume is larger, the path from the power oil nozzle to the test separator is subjected to control throttling circulation, the casing pressure fluctuation range is only 30psi, the casing pressure fine control can be realized, and finally the well killing is successful.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The well control system of the offshore high-temperature high-pressure narrow-safety-density window well is characterized by comprising a testing blowout prevention manifold and a killing high-pressure manifold, wherein the testing blowout prevention manifold comprises a testing ground safety valve (1), a power oil nozzle (2), a manual oil nozzle (3), an oil-gas separator (4), a testing separator (5), a slurry pool (6) and a combustion arm (7);
and connecting the test blowout prevention manifold into the kill-job high-pressure manifold, wherein the specific connection structure is as follows: the oil gas outlet of the kill high-pressure manifold is connected with the input end of the test ground safety valve (1) through a connecting pipeline, the output end of the test ground safety valve (1) is connected with the input end of the power oil nozzle (2) through a connecting pipeline, the output end of the power oil nozzle (2) is connected with the input end of the manual oil nozzle (3) through a connecting pipeline, the output end of the manual oil nozzle (3) is connected with a three-way pipe fitting (8) through a connecting pipeline, the input end of the test separator (5) is connected with the input end of the oil-gas separator (4) through the three-way pipe fitting (8), control valves (9) are arranged on two sides of the three-way pipe fitting (8), the gas output end of the test separator (5) is connected with the combustion arm (7) through a connecting pipeline, the liquid output end of the test separator (5) is connected with the slurry pool (6) through a connecting pipeline, the gas output end of the oil-gas separator (4) is connected with a blowout pipeline, and the liquid output end of the oil-gas separator (4) is connected with the slurry pool (6) through a connecting pipeline.
2. A well control system according to claim 1, characterized in that the test surface safety valve (1) is provided with a warning light.
3. A well control system according to claim 1, characterized in that the power nozzle tip (2) is hydraulically controlled to achieve a remotely operated nozzle tip opening.
4. A well control system according to claim 1, characterized in that the nozzle choke material of the power nozzle (2) is tungsten carbide.
5. A well control system according to claim 1, characterized in that the manual choke (3) is of a five-valve modular construction, wherein five valves are gate valves.
6. A well control system according to claim 1, characterized in that a temperature and pressure sensor and a chemical injection device are arranged on the manual choke (3).
7. A well control system according to claim 1, characterized in that the manual choke (3) is provided with a sampling opening through which fluid is sampled.
8. A well control system according to claim 1, characterized in that the test separator (5) is a horizontal separator.
9. A well control system according to claim 1, characterized in that all connecting lines are high pressure lines.
10. A well control method of an offshore high-temperature high-pressure narrow safe density window well is characterized by comprising the well control system of the offshore high-temperature high-pressure narrow safe density window well, which is disclosed by any one of claims 1 to 9, wherein a test blowout prevention manifold is connected into a kill high-pressure manifold, a blowout preventer is closed after a well control event occurs in an offshore drilling well, the kill high-pressure manifold is communicated to the test blowout prevention manifold, and the annular casing pressure of a throttling circulation kill well is controlled through the test blowout prevention manifold, and the specific process is as follows;
when the annulus casing pressure of the kill high-pressure manifold is higher than the threshold value, the control flow is as follows:
oil gas of a kill high-pressure manifold is conveyed to a test ground safety valve (1) through a connecting pipe fitting, the oil gas is conveyed to a power oil nozzle (2) by the test ground safety valve (1) through the connecting pipe fitting, the oil gas is conveyed to a manual oil nozzle (3) by the power oil nozzle (2) through the connecting pipe fitting, the manual oil nozzle (3) is conveyed to a three-way pipe fitting (8) through the connecting pipe fitting, a control valve (9) on the connecting pipe fitting, communicated with an oil-gas separator (4), of the three-way pipe fitting (8) is closed, a control valve (9) on the connecting pipe fitting, communicated with the test separator (5) at the other side is opened, the oil gas is conveyed to the test separator (5), the oil gas is separated by the test separator (5), the separated gas is conveyed to a combustion arm (7) through the connecting pipe fitting for combustion, and the separated liquid is recycled to a mud pit (6) through the connecting pipe fitting, so that the pressure release is realized, and the pressure stability of an annulus casing is kept;
when the annulus casing pressure of the kill high-pressure manifold is lower than the threshold value, the control flow is as follows:
the oil gas of the kill-job high-pressure manifold is conveyed to a test ground safety valve (1) through a connecting pipe fitting, the oil gas is conveyed to a power oil nozzle (2) by the test ground safety valve (1) through the connecting pipe fitting, the oil gas is conveyed to a manual oil nozzle (3) through the connecting pipe fitting by the power oil nozzle (2), the manual oil nozzle (3) is conveyed to a three-way pipe fitting (8) through the connecting pipe fitting, a control valve (9) on the connecting pipe fitting, communicated with a test separator (5), of the three-way pipe fitting (8) is closed, a control valve (9) on the connecting pipe fitting, communicated with the oil-gas separator (4) at the other side is opened, the oil gas is conveyed to the oil-gas separator (4), the oil gas is separated by the oil-gas separator (4), the separated gas is discharged through a blowout pipeline, the separated liquid is recycled to a slurry tank (6) through the connecting pipeline, so that the pressure is released, and the pressure stability of an annulus sleeve is kept.
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| CN114754294B (en) * | 2022-05-17 | 2023-05-26 | 广东管辅能源科技有限公司 | Oil transfer storage oil gas recovery monitoring system |
| CN114991691A (en) * | 2022-07-08 | 2022-09-02 | 中海艾普油气测试（天津）有限公司 | Emergency pressure relief system for drilling operation of offshore high-temperature and high-pressure well |
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| CN101253307A (en) * | 2005-08-29 | 2008-08-27 | 阿尔法贝利赛私人有限公司 | Control system for seabed processing system |
| CN101135236A (en) * | 2007-09-18 | 2008-03-05 | 中国石油天然气集团公司 | Collectively monitored throttling and controlling device |
| CN102359353A (en) * | 2011-09-22 | 2012-02-22 | 中国石油集团川庆钻探工程有限公司 | Closed-loop controlled-pressure well drilling system |
| CN103510893A (en) * | 2012-06-29 | 2014-01-15 | 中国石油天然气集团公司 | Well drilling device and method for controlling bottom hole pressure by monitoring flow |
| CN203879484U (en) * | 2014-05-20 | 2014-10-15 | 中石化江汉石油工程有限公司井下测试公司 | Shale gas well ground test system |
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