CN113404481B - Wellbore flow control method based on double-layer continuous pipe double-gradient drilling system - Google Patents
Wellbore flow control method based on double-layer continuous pipe double-gradient drilling system Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000012530 fluid Substances 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000010410 layer Substances 0.000 claims description 87
- 238000004140 cleaning Methods 0.000 claims description 13
- 239000013535 sea water Substances 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 4
- 239000002344 surface layer Substances 0.000 claims description 4
- 239000002355 dual-layer Substances 0.000 claims description 3
- 150000004677 hydrates Chemical class 0.000 claims description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 3
- 239000011707 mineral Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 4
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a wellbore flow control method based on a double-layer continuous pipe double-gradient drilling system, which comprises the following steps: 1) Drilling fluid enters the underground lifting pump from the annular space of the double-layer continuous pipe through the drilling pump of the deepwater drilling platform, enters the inner pipe of the double-layer continuous pipe after passing through the flow passage switching joint, enters the bottom of a well through the drill bit water hole after passing through the inner pipe of the underground tool combination, and forms pressure balance in the process of entering the bottom of the well; the motor of the downhole tool assembly is hydraulically driven by drilling fluid, and converts hydraulic energy into mechanical energy to provide power for the rotation of the downhole lifting pump and the drill bit; 2) Drilling fluid enters the annulus of the underground tool assembly from the return hole, enters the inner pipe of the double-layer continuous pipe through the flow passage switching joint, returns to the platform through the underground lifting pump, and forms pressure balance in the returning process. The invention can improve the working efficiency, reduce the occurrence of underground complex conditions, ensure the working safety and reduce the working cost.
Description
Technical Field
The invention relates to the technical field of oil and gas exploitation, in particular to a shaft flow control method based on a double-layer continuous pipe double-gradient drilling system.
Background
The marine natural gas hydrate resources in China are rich, most of the marine natural gas hydrate resources are formed in a seabed surface layer and a shallow muddy silt deposit layer, no dense cover layer exists, the marine natural gas hydrate has symbiotic property with oil gas, the problems of shallow burying depth, weak cementing, drainage and production, flow blockage, environmental risk prevention and control and the like exist, and a safe and economic drilling method is a key for deep water shallow hydrate exploration and development.
Because the sea water section causes the overburden stratum pressure lower, shallow stratum is loose, the window between pore pressure and fracture pressure is narrow, conventional deep water drilling adopts single drilling fluid density, and complex conditions such as serious leakage easily occur in the hydrate drilling process, the drilling operation risk and cost are increased, even the well hole scrapping and the environment disaster can be caused, and the requirements of exploration and development cannot be met based on the conventional oil gas drilling and exploitation theory.
The solid fluidization method is a new method for exploration and development of deep water shallow hydrate, a hydrate reservoir is broken into fine particles through bottom hole jet flow, the fluidized hydrate solid particles are returned to a sea surface platform along a shaft along with drilling fluid, and finally natural gas is obtained through separation. Although the method solves the problems of sand production and the like of deep water shallow non-diagenetic hydrate, the trial production time, the production yield and the like have great differences from an economic development threshold. The problems of loose deep water shallow stratum, low leakage pressure and the like are bottlenecks for restricting the exploration and development of marine natural gas hydrate, and a new drilling method is urgently needed to solve the problems.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a shaft flow control method based on a double-layer continuous pipe double-gradient drilling system, which can improve the working efficiency, reduce the occurrence of underground complex conditions, ensure the working safety and reduce the working cost.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention relates to a wellbore flow control method based on a double-layer continuous pipe double-gradient drilling system, which comprises the following steps: the deepwater drilling platform is arranged on the surface of the sea water layer; the double-layer continuous pipe is formed by sleeving a bent inner pipe and an outer pipe, the upper end of the double-layer continuous pipe is connected with the deepwater drilling platform, and the lower end of the double-layer continuous pipe penetrates through a sea water layer and a shallow mud layer and stretches into a hydrate layer; the surface layer conduit is arranged in the shallow mud layer and sleeved outside the double-layer continuous pipe; the underground lifting pump is arranged at the lower end of the double-layer continuous pipe; the runner conversion joint is connected with the lower end of the double-layer continuous pipe; a downhole tool assembly connected to the flow passage adapter; a drill bit in combination with the downhole tool; the wellbore flow control method comprises the following steps:
1) Drilling fluid enters the underground lifting pump from the annular space of the double-layer continuous pipe through the drilling pump of the deepwater drilling platform, enters the inner pipe of the double-layer continuous pipe after passing through the flow passage switching joint, enters the bottom of a well through the drill bit water hole after passing through the inner pipe of the underground tool combination, and forms pressure balance in the process of entering the bottom of the well; the motor of the downhole tool assembly is hydraulically driven by drilling fluid, and converts hydraulic energy into mechanical energy to provide power for the rotation of the downhole lifting pump and the drill bit;
2) Drilling fluid enters the annulus of the underground tool assembly from the return hole, enters the inner pipe of the double-layer continuous pipe through the flow passage switching joint, returns to the platform through the underground lifting pump, and forms pressure balance in the returning process.
In the wellbore flow control method, preferably, the pressure balance relation in the process of pumping the drilling fluid from the platform to the bottom hole in the step 1) is as follows:
pb＝psp+ρgh-Vpa-Vptp-Vpbit (1)
Wherein p b is the bottom hole pressure; p sp is the riser pressure; ρ is the drilling fluid density; h is the vertical depth of the well bore; vp a is the annular pressure loss of the double-layer pipe; vp tp is the lumen pressure loss of the downhole tool assembly; vp bit is the bit pressure loss.
In the wellbore flow control method, preferably, the pressure balance relation in the process of returning the drilling fluid from the bottom of the well to the platform in the step 2) is as follows:
pb＝ps+ρgh-Vpp-Vpta-Vppump (2)
Wherein p b is the bottom hole pressure; p s is wellhead pressure; ρ is the drilling fluid density; h is the vertical depth of the well bore; vp p is the in-tube pressure loss of the double-layer tube; vp ta is the annular pressure loss of the downhole tool assembly; vp pump is the pressure energy provided by the downhole lift pump.
In the wellbore flow control method, preferably, in the step 2), the bottom hole equivalent circulating density is:
Wherein ρ is the bottom hole equivalent circulating density; p s is wellhead pressure; ρ is the drilling fluid density; h is the vertical depth of the well bore; vp p is the in-tube pressure loss of the double-layer tube; vp ta is the annular pressure loss of the downhole tool assembly; vp pump is the pressure energy provided by the downhole lift pump.
In the wellbore flow control method, preferably, the drilling process of the double-layer continuous pipe double-gradient drilling system is divided into two stages: firstly, drilling to a target well depth in a well drilling mode, then switching to a well cleaning mode, dragging a tubular column back and forth in a reservoir section to clean the well shaft and hydrates in a near-wellbore zone, and returning to a deep water drilling platform through a downhole lifting pump and a double-layer continuous pipe.
In the wellbore flow control method, preferably, the operation flow of the wellbore drilling mode and the wellbore cleaning mode is as follows:
(1) Wellbore drilling mode: pumping drilling fluid from the annular space of the double-layer continuous pipe to the underground, entering the inner pipe of the underground tool assembly through the runner adapter, driving the underground motor through the hydrodynamic force of the drilling fluid, entering the annular space of the underground tool assembly through the bit water hole, entering the annular space of the underground tool assembly through the return hole, entering the inner pipe of the double-layer continuous pipe through the runner adapter, and returning to the ground through the underground lifting pump;
(2) Wellbore cleaning mode: the underground tool flow passage is switched through ground pressurizing, a water hole communicated with the stratum annulus of the underground tool is opened, a borehole cleaning mode of the double-layer continuous pipe double-gradient drilling system is started, mineral particles gathered in the well bottom annulus are cleaned through lifting and lowering the double-layer continuous pipe, and no drilling fluid is circulated in the annulus between the borehole and the double-layer continuous pipe.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. The double-layer coiled tubing is adopted for drilling operation, a circulating loop of drilling fluid can be established without entering a water-proof pipe, and a drilling upright post is connected or detached without stopping a pump to interrupt circulation in the process of tripping, so that the stability of bottom hole pressure is maintained, and the rock carrying efficiency is improved.
2. The pressure of the well annulus drilling fluid in the stratum is reduced by the power provided by the underground lifting pump, so that the pressure profile of the liquid column in the well annulus in the stratum is effectively matched with the pore pressure and the fracture pressure window of the stratum, and the contradiction between deep water shallow layer looseness and low leakage pressure is relieved.
In a word, double-layer continuous pipe double-gradient drilling can improve the operation efficiency, reduce the occurrence of underground complex conditions, ensure the operation safety and reduce the operation cost.
Drawings
FIG. 1 is a schematic diagram of a dual-layer coiled tubing dual-gradient drilling system in accordance with the present invention;
FIG. 2 is a graph showing the pressure distribution of a double-layer continuous pipe double-gradient well bore compared with a conventional well bore in the invention;
FIG. 3 is a schematic flow diagram of a downhole tool assembly in a wellbore drilling mode according to the present invention;
FIG. 4 is a schematic flow diagram of a downhole tool assembly in a wellbore cleanout mode according to the present invention.
The reference numerals in the figures are as follows:
1-a deepwater drilling platform; 2-double-layer continuous pipe; 3-surface catheter; 4-a downhole lifting pump; 5-a runner adapter; 6-a downhole tool assembly; 7-drill bit.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the attached drawings, so that the objects, features and advantages of the present invention will be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the invention, but rather are merely illustrative of the true spirit of the invention.
As shown in fig. 1, the double-layer coiled tubing double-gradient drilling system according to the present invention comprises: the deepwater drilling platform 1 is arranged on the surface of the sea water layer; the double-layer continuous pipe 2 is formed by sleeving a bent inner pipe and an outer pipe, the upper end of the double-layer continuous pipe 2 is connected with the deep water drilling platform 1, and the lower end of the double-layer continuous pipe passes through the sea water layer and the shallow mud layer and stretches into the hydrate layer; the surface layer conduit 3 is arranged in the shallow mud layer and sleeved outside the double-layer continuous pipe 2; the underground lifting pump 4 is arranged at the lower end of the double-layer continuous pipe 2; the runner adapter 5 is connected with the lower end of the double-layer continuous pipe 2; the downhole tool assembly 6 is connected with the runner adapter 5; a drill bit 7 connected to the downhole tool assembly 6.
The invention discloses a wellbore flow control method based on a double-layer continuous pipe double-gradient drilling system, which comprises the following steps of:
1) Drilling fluid enters the underground lifting pump from the annular space of the double-layer continuous pipe through the drilling pump of the deepwater drilling platform, enters the inner pipe of the double-layer continuous pipe after passing through the flow passage switching joint, enters the bottom of a well through the drill bit water hole after passing through the inner pipe of the underground tool combination, and forms pressure balance in the process of entering the bottom of the well; the motor of the downhole tool assembly is hydraulically driven by drilling fluid, and converts hydraulic energy into mechanical energy to provide power for the rotation of the downhole lifting pump and the drill bit;
the pressure balance relation in the process of pumping drilling fluid from the platform to the bottom hole is as follows:
pb＝psp+ρgh-Vpa-Vptp-Vpbit (1)
Wherein p b is the bottom hole pressure; p sp is the riser pressure; ρ is the drilling fluid density; h is the vertical depth of the well bore; vp a is the annular pressure loss of the double-layer pipe; vp tp is the lumen pressure loss of the downhole tool assembly; vp bit is the bit pressure loss.
2) Drilling fluid enters the annulus of the underground tool assembly from the return hole, enters the inner pipe of the double-layer continuous pipe through the flow passage switching joint, returns to the platform through the underground lifting pump, and forms pressure balance in the returning process.
The pressure balance relation in the process of returning drilling fluid from the bottom of the well to the platform flow is as follows:
pb＝ps+ρgh-Vpp-Vpta-Vppump (2)
Wherein p b is the bottom hole pressure; p s is wellhead pressure; ρ is the drilling fluid density; h is the vertical depth of the well bore; vp p is the in-tube pressure loss of the double-layer tube; vp ta is the annular pressure loss of the downhole tool assembly; vp pump is the pressure energy provided by the downhole lift pump.
The bottom hole equivalent circulating density is:
Wherein ρ is the bottom hole equivalent circulating density; p s is wellhead pressure; ρ is the drilling fluid density; h is the vertical depth of the well bore; vp p is the in-tube pressure loss of the double-layer tube; vp ta is the annular pressure loss of the downhole tool assembly; vp pump is the pressure energy provided by the downhole lift pump.
In the double-layer continuous pipe double-gradient drilling circulation process, the pressure energy provided by the underground lifting pump reduces the pressure required by returning the drilling fluid to the bottom of the platform, so that the equivalent circulating density of the bottom of the well is effectively reduced, the bottom pressure is in a stratum safety density window, the double-gradient effect is achieved, and the problem of leakage of deep water loose shallow hydrate drilling can be effectively solved.
The pressure distribution of the double-layer continuous pipe double-gradient drilling shaft is shown in fig. 2, and the larger the pressure energy provided by the lifting pump is, the larger the bottom hole pressure reduction amplitude is, and the lower the bottom hole equivalent circulating density is. The power of the underground lifting pump is provided by the underground motor, and the output power of the underground motor can be increased by increasing the discharge of the drilling fluid, so that the power provided by the underground lifting pump for returning the drilling fluid is increased. Meanwhile, along-path pressure consumption of drilling fluid returned to the platform increases with the increase of the displacement. Therefore, hydraulic parameters are required to be optimized by combining parameters such as well structure, drilling tool size and the like, and a basis is provided for controlling the bottom hole pressure.
The double-layer continuous pipe double-gradient drilling process is divided into two stages, firstly, drilling is carried out to the target well depth in a drilling mode, then, the drilling mode is switched to a cleaning mode, a pipe column is dragged back and forth in a reservoir section to clean a well bore and hydrates in a near-wellbore zone, and the hydrate is returned to a platform through a lifting system. The operation flow of the two working modes is as follows:
(1) Wellbore drilling mode: the drilling fluid is pumped from the annular space of the double-layer continuous pipe to the underground, enters the inner pipe of the underground tool string combination through the flow passage switching joint, drives the underground motor through the hydrodynamic force of the drilling fluid, enters the annular space of the underground tool string combination through the bit water hole, enters the annular space of the underground tool string combination through the return hole, enters the inner pipe of the double-layer continuous pipe through the flow passage switching joint, returns to the ground through the underground lifting pump, and the flowing process in the underground tool combination is shown in figure 3.
(2) Wellbore cleaning mode: switching the flow passage of the downhole tool through ground pressurization, opening a water hole communicated with the stratum annulus of the downhole tool, starting a borehole cleaning mode of the double-layer continuous pipe double-gradient drilling system, cleaning mineral particles gathered in the well annulus by lifting and lowering the double-layer continuous pipe, and ensuring that no drilling fluid is circulated in the annulus between the borehole and the double-layer continuous pipe, wherein the flowing process in the downhole tool combination is shown in figure 4.
In the operation process, the ground pump pressing can be freely switched between two modes according to the operation requirement through the shaft pressure monitoring and the shaft cleaning condition until the operation task is completed, and the double-layer pipe column is lifted out and the underground tool combination is recovered.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (1)
1. A wellbore flow control method based on a dual-layer coiled tubing dual-gradient drilling system, the dual-layer coiled tubing dual-gradient drilling system comprising: the deepwater drilling platform is arranged on the surface of the sea water layer; the double-layer continuous pipe is formed by sleeving a bent inner pipe and an outer pipe, the upper end of the double-layer continuous pipe is connected with the deepwater drilling platform, and the lower end of the double-layer continuous pipe penetrates through a sea water layer and a shallow mud layer and stretches into a hydrate layer; the surface layer conduit is arranged in the shallow mud layer and sleeved outside the double-layer continuous pipe; the underground lifting pump is arranged at the lower end of the double-layer continuous pipe; the runner conversion joint is connected with the lower end of the double-layer continuous pipe; a downhole tool assembly connected to the flow passage adapter; a drill bit in combination with the downhole tool; the method is characterized by comprising the following steps of:
1) Drilling fluid enters the underground lifting pump from the annular space of the double-layer continuous pipe through the drilling pump of the deepwater drilling platform, enters the inner pipe of the double-layer continuous pipe after passing through the flow passage switching joint, enters the bottom of a well through the drill bit water hole after passing through the inner pipe of the underground tool combination, and forms pressure balance in the process of entering the bottom of the well; the motor of the downhole tool assembly is hydraulically driven by drilling fluid, and converts hydraulic energy into mechanical energy to provide power for the rotation of the downhole lifting pump and the drill bit;
2) Drilling fluid enters an annulus of the underground tool assembly from the return hole, enters an inner pipe of the double-layer continuous pipe through the flow passage adapter, returns to the platform through the underground lifting pump, and forms pressure balance in the returning process;
The pressure balance relation formula in the process of pumping drilling fluid from a platform to a bottom hole in the step 1) is as follows:
pb＝psp+ρgh-△pa-△ptp-△pbit (1)
Wherein p b is the bottom hole pressure; p sp is the riser pressure; ρ is the drilling fluid density; h is the vertical depth of the well bore; Δp a is the annular pressure loss of the double-layer tube; Δp tp is the internal cavity pressure loss of the downhole tool assembly; Δp bit is the bit pressure loss;
The pressure balance relation formula in the process of returning the drilling fluid from the bottom of the well to the platform in the step 2) is as follows:
pb＝ps+ρgh-△pp-△pta-△ppump (2)
Wherein p b is the bottom hole pressure; p s is wellhead pressure; ρ is the drilling fluid density; h is the vertical depth of the well bore; Δp p is the in-line pressure loss of the double-layer tube; Δp ta is the annular pressure loss of the downhole tool assembly; Δp pump is the pressure energy provided by the downhole lift pump;
In said step 2), the bottom hole equivalent circulating density is:
Wherein ρ is the bottom hole equivalent circulating density; p s is wellhead pressure; ρ is the drilling fluid density; h is the vertical depth of the well bore; Δp p is the in-line pressure loss of the double-layer tube; Δp ta is the annular pressure loss of the downhole tool assembly; Δp pump is the pressure energy provided by the downhole lift pump;
the drilling process of the double-layer continuous pipe double-gradient drilling system comprises two stages: firstly, drilling to a target well depth in a well drilling mode, switching to a well cleaning mode, dragging a tubular column back and forth in a reservoir section to clean a well shaft and hydrates in a near-wellbore zone, and returning to a deep water drilling platform through a downhole lifting pump and a double-layer continuous pipe;
the operation flow of the well drilling mode and the well cleaning mode is as follows:
(1) Wellbore drilling mode: pumping drilling fluid from the annular space of the double-layer continuous pipe to the underground, entering the inner pipe of the underground tool assembly through the runner adapter, driving the underground motor through the hydrodynamic force of the drilling fluid, entering the annular space of the underground tool assembly through the bit water hole, entering the annular space of the underground tool assembly through the return hole, entering the inner pipe of the double-layer continuous pipe through the runner adapter, and returning to the ground through the underground lifting pump;
(2) Wellbore cleaning mode: the underground tool flow passage is switched through ground pressurizing, a water hole communicated with the stratum annulus of the underground tool is opened, a borehole cleaning mode of the double-layer continuous pipe double-gradient drilling system is started, mineral particles gathered in the well bottom annulus are cleaned through lifting and lowering the double-layer continuous pipe, and no drilling fluid is circulated in the annulus between the borehole and the double-layer continuous pipe.
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| CN111021958A (en) * | 2019-12-23 | 2020-04-17 | 西南石油大学 | Double-layer coiled tubing and double-gradient drilling system |
| CN111622697A (en) * | 2020-06-01 | 2020-09-04 | 西南石油大学 | Deep-sea double-layer pipe well bottom three-channel pressure control system and control method |
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| JP4016094B2 (en) * | 1998-09-09 | 2007-12-05 | 鉱研工業株式会社 | Double tube swivel |
| AP2015008821A0 (en) * | 2013-05-06 | 2015-10-31 | Halliburton Energy Services Inc | Wellbore drilling using dual drill string |
| CN110067512A (en) * | 2018-01-23 | 2019-07-30 | 中石化石油工程技术服务有限公司 | A kind of double-gradient well drilling system and its boring method |
| FI20185061A1 (en) * | 2018-01-23 | 2019-07-24 | Mincon Nordic Oy | Arrangement and method for installing a ground pipe |
| CN108643869B (en) * | 2018-04-24 | 2020-08-04 | 西南石油大学 | Seabed shallow layer natural gas hydrate solid fluidization green mining device and method |
| CN111827909B (en) * | 2020-08-04 | 2021-06-01 | 中国石油大学(华东) | Active control method and device for well bore pressure in open-circuit circulating drilling of sea area natural gas hydrate |
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| CN111021958A (en) * | 2019-12-23 | 2020-04-17 | 西南石油大学 | Double-layer coiled tubing and double-gradient drilling system |
| CN111622697A (en) * | 2020-06-01 | 2020-09-04 | 西南石油大学 | Deep-sea double-layer pipe well bottom three-channel pressure control system and control method |
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