CN208900028U - A kind of double-gradient well drilling system - Google Patents
A kind of double-gradient well drilling system Download PDFInfo
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- CN208900028U CN208900028U CN201820112572.2U CN201820112572U CN208900028U CN 208900028 U CN208900028 U CN 208900028U CN 201820112572 U CN201820112572 U CN 201820112572U CN 208900028 U CN208900028 U CN 208900028U
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Abstract
The utility model discloses a kind of double-gradient well drilling systems.The system is mainly driven adaptive device, double-wall drill pipe, cross-over sub, data monitoring control system and auxiliary pump installation by top and is formed.Drilling well pump group injects first fluid and passes through double-wall drill pipe, cross-over sub, then reaches downstream mud disposal system by discharge pipe；Auxiliary pump installation is for injecting second fluid into annular space A, for adjusting the barometric gradient in annular space A；Data monitoring control system is used to monitor the second fluid flow of auxiliary pump installation injection, so that it is determined that height of the second fluid in annular space A.The utility model is adaptable, can be applied to land bored well and offshore drilling；Deepwater petroleum exploration exploitation is realized in cost that can be less expensive, shorter shaft building time, safer operation.
Description
Technical field
The utility model relates in well system more particularly to a kind of double-gradient well drilling system based on double-wall drill pipe.
Background technique
With the sustained and rapid development of Chinese national economy, the demand to petroleum gas constantly increases, and petroleum resources are surveyed
It visits to develop to march to deep-sea and has become inexorable trend.Compared with land and well drilling of shallow sea, deep sea drilling environment is more complicated, is easy to appear
Conventional drilling equipment and method are difficult to the technical problem overcome.
Currently, mainly single gradient well drilling technology that offshore drilling uses.Wellbore of single gradient well drilling technology in same size
In only one fluid column gradient, i.e. bottom pressure generates by the drilling well head of liquid on sea to shaft bottom, drilling well head of liquid ladder
Degree is using sea as reference point.In deepwater drilling, since the loose deposit in seabed and seawater column influence, strata pressure and broken
Gap very little between split pressure, so that drilling well is extremely difficult.Double-gradient well drilling (the Dual- of the external development nineties in last century
Gradient Drilling, abbreviation DGD) technology well solved this problem, when using the technology, the above water proof in seabed
Tube fluid density is close with density of sea water, and the calculation of pressure of drilling well fluid column is using seabed as reference point, formation pore pressure and broken
Region just relatively broadens between split pressure.Well kick, blowout and leakage accident greatly reduce, and no longer need multilayer sleeve system, save
Setting of casing time and well cementation time, shorten well construction period, reduce drilling time and reduce time and the cost of processing drilling failure,
Substantially reduce the requirement to drilling equipments such as drilling platforms and drilling machines.
Oneself carries out multiple double-gradient well drilling systematic researches and application: the industrial combination project of Conoco leader at present for foreign countries
The seabed mud of group research lifts drilling well (Subsea Mudlift Drilling, abbreviation SMD) system, U.S. Baker
The DeepVision double-gradient well drilling system of Hughes and Transocean company research, the sub-sea pumping system of Shell
(Subsea Pumping System, abbreviation SSPS), Maurer company tiny balloon (Hollow Glass Spheres,
Abbreviation HGS) double-gradient well drilling system, AGR Subsea company without marine riser drilling fluid recovery system (Riserless Mud
Recovery System, abbreviation 1ZM are helped, the marine riser gaslift of Louisiana State University's research, dilution double-gradient well drilling
System etc..Wherein mud lifting well system in seabed will carry out field test in the Gulf of Mexico in the end of the year 2001, and succeed, mesh
Preceding oneself starts to put into industrial application, has good prospects for commercial application.
It follows that dual-gradient drilling technology is the deepwater drilling technology having a extensive future, it can overcome deep water
The problem of special natural environment, reservoir condition are brought, can be with less expensive cost, shorter well construction period, safer work
Industry, higher yield realize deepwater petroleum exploration exploitation.Oneself is developed a variety of implementation methods and change system to the technology, and oneself
Scene carries out industrial application.For the paces for accelerating China's deep water oil development, it is necessary to practical for Chinese Sea deep water block
Situation, tracking and the external advanced DGD technology of research, use for reference its successful experience, develop and are suitble to China's national situation and have independently know
The deepwater drilling technology for knowing property right, forms a whole set of drilling technology system for instructing China's deep water oil development, to raising China
Deepwater drilling technical level has important strategic importance.
Utility model content
The purpose of this utility model is the paces to accelerate China's deep water oil development, real for Chinese Sea deep water block
Border situation provides a whole set of double-gradient well drilling system for instructing China's deep water oil development.
The double-gradient well drilling system of the utility model is achieved in that
The first double-gradient well drilling system, including drilling well pump group 1, top drive 2, auxiliary pump installation 3, data monitoring control system
4, adaptive device 5, marine riser 20, conventional preventer group 7, casing 8, double-wall drill pipe 9, cross-over sub 10, conventional drilling tool 11 are driven in top
With drill bit 12, in which:
The double-wall drill pipe 9 is made of concentric interior drilling rod 91 and outer drilling rod 90, structure between interior drilling rod 91 and outer drilling rod 90
At annular space B17, the inside of interior drilling rod 91 forms duct A18；Annular space B17 is used to convey first fluid to shaft bottom, and duct A18 is the
One fluid returns out runner, and adaptive device 5 is driven on 9 top of double-wall drill pipe connection top, and lower part connects cross-over sub 10；
The top drive adaptive device 5 is mounted on the rotary joint between top drive 2 and double-wall drill pipe 9, and top is driven adaptive device 5 and added
Work has duct B50 and duct C51, and slurry channel and annular space B17, the duct connected pore channel C51 A18 and well are driven in duct B50 connection top
Mouth discharge pipe；
The cross-over sub 10 is machined with duct D100, duct E101 and check valve 102, the connection of 10 lower part of cross-over sub
Conventional drilling tool 11 and drill bit 12；
Double-wall drill pipe 9, cross-over sub 10, conventional drilling tool 11 and drill bit 12 constitute down-hole equipment after connecting according to this from top to bottom
Combination；
The drilling well pump group 1 is short by top drive 2, top drive adaptive device duct B50, double-wall drill pipe annular space B17, conversion according to this
Duct E101, conventional drilling tool 11 and drill bit 12 is connect to be connected to shaft bottom；Pass through cross-over sub duct D100, double-walled according to this by shaft bottom again
Drilling rod duct A18, top drive the discharge pipe that adaptive device duct C51 returns to well head；
Marine riser 20 is connected to conventional 7 top of preventer group, and auxiliary pump installation 3 passes through outside marine riser 20 and double-wall drill pipe 9
The annular space in portion is connected to；
Data monitoring control system 4 connect with auxiliary pump installation 3 and monitors the flow of auxiliary pump installation 3.
Second of double-gradient well drilling system, including drilling well pump group 1, top drive 2, auxiliary pump installation 3, data monitoring control system
4, top is driven adaptive device 5, rotation blow-out release device 6, conventional preventer group 7, casing 8, double-wall drill pipe 9, cross-over sub 10, routine and is bored
Tool 11 and drill bit 12, in which:
The double-wall drill pipe 9 is made of concentric interior drilling rod 91 and outer drilling rod 90, structure between interior drilling rod 91 and outer drilling rod 90
At annular space B17, the inside of interior drilling rod 91 forms duct A18；Annular space B17 is used to convey first fluid to shaft bottom, and duct A18 is the
One fluid returns out runner, and adaptive device 5 is driven on 9 top of double-wall drill pipe connection top, and lower part connects cross-over sub 10；
The top drive adaptive device 5 is mounted on the rotary joint between top drive 2 and double-wall drill pipe 9, and top is driven adaptive device 5 and added
Work has duct B50 and duct C51, and slurry channel and annular space B17 are driven in duct B50 connection top, and duct C51 is together with duct A18 and well
Mouth discharge pipe；
The cross-over sub 10 is machined with duct D100, duct E101 and check valve 102, the connection of 10 lower part of cross-over sub
Conventional drilling tool 11 and drill bit 12；
Double-wall drill pipe 9, cross-over sub 10, conventional drilling tool 11 and drill bit 12 constitute down-hole equipment after connecting according to this from top to bottom
Combination；
The drilling well pump group 1 is short by top drive 2, top drive adaptive device duct B50, double-wall drill pipe annular space B17, conversion according to this
Duct E101, conventional drilling tool 11 and drill bit 12 is connect to be connected to shaft bottom；Pass through cross-over sub duct D100, double-walled according to this by shaft bottom again
Drilling rod duct A18, top drive the discharge pipe that adaptive device duct C51 returns to well head；
Rotation blow-out release device 6 is connected to 7 top of conventional preventer group, and auxiliary pump installation 3 passes through rotation blow-out release device 6 and double
Annular space connection outside wall drilling rod 9；
Data monitoring control system 4 connect with auxiliary pump installation 3 and monitors the flow of auxiliary pump installation 3.
Above-mentioned the first or second of double-gradient well drilling system advanced optimize scheme further include:
Dedicated choke manifold 19 is accessed on the well head discharge pipe that adaptive device 5 is driven on top, dedicated choke manifold 19 is mating
Drilling well throttle valve, data monitoring control system 4 connect and monitor drilling well throttle valve.
The advantages of the utility model includes that (1) is adaptable, can be applied to land bored well and offshore drilling；(2) can
Effectively in solution deepwater drilling, since the loose deposit in seabed and seawater column influence, gap between strata pressure and fracture pressure
Drilling complexity problem caused by very little；(3) deep water oil is realized in less expensive cost, shorter shaft building time, safer operation
Gas exploration exploitation；(4) well system and boring method that the utility model is proposed, are applicable not only to deepwater drilling, are also suitable
Drilling well under the conditions of the complex drillings such as the narrow Density Window in land bored well.
Detailed description of the invention
Fig. 1 is the overall device and connection schematic diagram of the first double-gradient well drilling system embodiment 1 of the utility model.
Fig. 2 is the overall device and connection schematic diagram of second of double-gradient well drilling system embodiment 2 of the utility model.
Fig. 3 is the well structure design figure of conventional drilling (single gradient well drilling).
Fig. 4 is the well structure design figure using the utility model double-gradient well drilling system.
In figure: 1. drilling well pump groups, 2. tops are driven, and 3. auxiliary pump installations, 4. data monitoring control systems, adaptation dress is driven on 5. tops
It sets, 6. rotation blow-out release devices, 7. conventional preventer groups, 8. casings, 9. double-wall drill pipes, 10. cross-over subs, 11. conventional drilling tools,
12. drill bit, 13. naked eyes, 14. annular space A, 15. drilling tool check valves, 16. second fluid annular fluid column lower ends, 17. annular space B, 18.
Duct A, 19. dedicated choke manifolds, 20. marine risers, 50. duct B, 51. duct C, 90. outer drilling rods, drilling rod in 91., 100. holes
Road D, 101. duct E, 102. check valves.
Specific embodiment
The utility model is further described with reference to the accompanying drawings of the specification:
During offshore drilling, using conventional single its drilling fluid (mud) hydrostatic pressure curve of gradient well drilling technology and well bore
Structure is as shown in Fig. 3.Since the loose deposition of deep-water subsea and seawater column act on, between strata pressure and fracture pressure curve
Narrow gaps, hydrostatic pressure (i.e. mud static pressure in figure) curve of conventional drilling drilling fluid is extended from sea drill ship
Straight line, the hydrostatic pressure pass through drilling fluid density window in very short vertical range, are difficult to tie up open-hole annulus pressure
It holds among this two curves, is easy to happen leakage accident.In order to guarantee the quality of well bore, lower multilayer sleeve column (such as Fig. 3 is needed
The smooth drilling of one spud section of seabed can not be completely secured by designing 7 layers of casing all).
Embodiment 1, as indicated with 2, double-gradient well drilling system is applied to no marine riser offshore drilling.A kind of double-gradient well drilling system
System includes drilling well pump group 1, top drive 2, auxiliary pump installation 3, data monitoring control system 4, adaptive device 5 is driven on top, rotation open flow fills
Set 6, conventional preventer group 7, casing 8, double-wall drill pipe 9, cross-over sub 10, conventional drilling tool 11 and drill bit 12.Double-wall drill pipe 9 is by same
The interior drilling rod 91 and outer drilling rod 90 of the heart form, and annular space B17, the inside shape of interior drilling rod 91 are constituted between interior drilling rod 91 and outer drilling rod 90
At duct A18；Annular space B17 is used to convey first fluid to shaft bottom, and duct A18 is that first fluid returns out runner；Drive adaptation dress in top
Setting 5 is the rotary joint being mounted between top drive 2 and double-wall drill pipe 9, and 2 connection is driven for double-wall drill pipe 9 and top；Drive suitable in top
Duct B50 and duct C51 are machined with device 5；Drive slurry channel and annular space B17, duct C51 intercommunicating pore in duct B50 connection top
Road A18 is to dedicated choke manifold 19；Cross-over sub 10 is machined with duct D100, duct E101 and check valve 102, for injecting stream
The runner of body is converted and the opening and closing of duct A18.In seabed, installation seabed in 7 top of routine preventer group rotates blow-out release device 6, auxiliary
It helps pump installation 3 to reach seabed by pipeline to be connected to annular space A14.
Double-wall drill pipe 9 protrudes into wellbore, and adaptive device 5 is driven on top connection top, and lower part connects cross-over sub 10；Cross-over sub
10 lower parts connect conventional drilling tool 11 and drill bit 12；Double-wall drill pipe 9, cross-over sub 10, conventional drilling tool 11 and drill bit 12 constitute underground
Drill assembly；Annular space A14 is formed between downhole assembly and wellbore, wellbore is made of casing 8 and naked eye 13, on second fluid
Hold liquid level that can also be located in the connecting pipeline of auxiliary pump installation 3 and seabed annular space A14.Conventional drilling tool 11 may include conventional
Single wall drilling rod, single wall drill collar and drilling tool check valve 15 and underground observing and controlling tool etc..
The injection first fluid of drilling well pump group 1 drives 2 by top, top drive adaptive device duct B50, double-wall drill pipe annular space B17, turns
It changes and is shorted duct E101, conventional drilling tool 11 and drill bit 12, into annular space A14；The first fluid that annular space A14 is returned is by conversion
It is shorted duct D100, double-wall drill pipe duct A18, top drive adaptive device duct C51, then passes through discharge pipe and reaches downstream mud
Processing system.
Auxiliary pump installation 3 is for injecting second fluid into annular space A14, for adjusting the barometric gradient in annular space A14；Number
It is used to monitor the second fluid flow that auxiliary pump installation 3 injects according to monitor control system 4, so that it is determined that second fluid is in annular space
Height in A14.
Embodiment 2, as shown in Figure 1, double-gradient well drilling system is applied to marine riser offshore drilling.Double-gradient well drilling system,
Including drilling well pump group 1, pushes up and drive 2, auxiliary pump installation 3, data monitoring control system 4, top drive adaptive device 5, marine riser 20, routine
Preventer group 7, casing 8, double-wall drill pipe 9, cross-over sub 10, conventional drilling tool 11 and drill bit 12.Wherein auxiliary pump installation 3 passes through pipe
Line is connected to 20 top of marine riser, to be connected to annular space A14, therefore annular space A14 also includes downhole assembly and marine riser
20 annular spaces formed, remaining implementation content are same as Example 1.
In embodiment 1 and embodiment 2, the second fluid in the annular space A14 forms annular fluid column, second fluid annular
In 10 top of cross-over sub, second fluid is not involved in the entire cyclic process of first fluid for fluid column lower end position 16；In annular space A14
Open-Hole Section in, the second fluid static pressure at different depth is located between the strata pressure and fracture pressure of respective depth；Institute
In the first fluid cyclic process stated, the pressure formed in the annular space A14 of 10 lower part of cross-over sub is located at the ground of respective depth
Between stressor layer and fracture pressure；Density by changing the first fluid changes simultaneously the height of second fluid annular fluid column
Degree is to adjust bottom pressure, to adjust the Fluid pressure of different Open-Hole Section depth in annular space A14；Adaptive device 5 is driven on top
Dedicated choke manifold 19 is installed between discharge pipe and downstream mud disposal system, dedicated choke manifold Matched Drilling throttle valve,
Data monitoring control system 4 is realized to the backpressure regulation of the first fluid for returning out double-wall drill pipe simultaneously by control drilling well throttle valve
Change the height of second fluid annular fluid column to adjust bottom pressure, to adjust the stream of different Open-Hole Section depth in annular space A14
Body pressure.
After a kind of double-gradient well drilling system proposed using the utility model, drilling fluid (first fluid and second
Body) hydrostatic pressure curve and casing programme it is as shown in Fig. 4.It is second fluid, the second fluid hydrostatic formed in annular space A14
Pressure curve is straight line.Second fluid hydrostatic pressure curve and upper window line segment and lower window stratum line segment intersection
(upper window line segment be Open-Hole Section the top strata pressure and fracture pressure line, lower window line segment be Open-Hole Section most
The strata pressure of lower end and the line of fracture pressure), and the straight line also is located at the strata pressure of different open hole well depths and breaks
Between split pressure.There are two types of the calculation methods of bottom pressure: one is bottom pressures to be equal to first fluid following in the A18 of duct
Ring pressure consumption, first fluid annular space A14 lower section (the annular space A positioned at 10 lower part of cross-over sub) annular space cyclic pressure dissipation and first
The sum of the liquid column hydrostatic pressure of the entire wellbore of fluid；Another kind is that bottom pressure is equal to second fluid liquid column hydrostatic pressure, first-class
Body annular space A14 lower section (the annular space A positioned at 10 lower part of cross-over sub) cyclic pressure dissipation with and first fluid at annular space A14
The sum of the liquid column hydrostatic pressure of section.The bottom pressure that two methods calculate is equal, and the ground for being located at bored Open-Hole Section shaft bottom is laminated
Between power and fracture pressure.In drilling process, first fluid density and the second fluid annular liquid in annular space A14 are constantly adjusted
The height of column, to guarantee that annular space A Open-Hole Section pressure is located between the strata pressure and fracture pressure of respective depth.It is driven when on top
When dedicated choke manifold 19 being installed between the discharge pipe and downstream mud disposal system of adaptive device 5, the first of bottom pressure
Kind calculation method is also referred to as cyclic pressure dissipation, first fluid of the first fluid in the A18 of duct and (is located in annular space A14 lower section
The annular space A of 10 lower part of cross-over sub) annular space cyclic pressure dissipation, first fluid back pressure and first fluid entire wellbore it is quiet
The sum of head of liquid；Therefore, drilling well throttle valve can be controlled by data monitoring control system 4 to realize to returning out double-wall drill pipe
The backpressure regulation of first fluid change simultaneously the height of second fluid annular fluid column to adjust bottom pressure, to adjust annular space
The Fluid pressure of different Open-Hole Section depth in A14.
Open-Hole Section annular pressure can be reduced to one since below sea by the double-gradient well drilling system of the utility model
Straight line, the slope (relative to sea or seabed) of straight line greatly reduces, gap between pore pressure and fracture pressure
It just relatively broadens, there is a relatively large vertical range to guarantee safety drilling, reduce casing and use the number of plies, and make deep water multiple
Drilling well is possibly realized under the conditions of miscellaneous.
Claims (6)
1. a kind of double-gradient well drilling system, including drilling well pump group (1), top drive (2), auxiliary pump installation (3), data monitoring control system
It unites (4), adaptive device (5), marine riser (20), conventional preventer group (7), casing (8), double-wall drill pipe (9), cross-over sub are driven in top
(10), conventional drilling tool (11) and drill bit (12), it is characterised in that:
The double-wall drill pipe (9) is made of concentric interior drilling rod (91) and outer drilling rod (90), interior drilling rod (91) and outer drilling rod (90)
Between constitute annular space B (17), the inside of interior drilling rod (91) forms duct A (18)；Annular space B (17) is used to convey to shaft bottom first-class
Body, duct A (18) are that first fluid returns out runner, and adaptive device (5) are driven on double-wall drill pipe (9) top connection top, and lower part connection turns
Change short circuit (10)；
The rotary joint that adaptive device (5) are mounted between top drive (2) and double-wall drill pipe (9) is driven on the top, and adaptive device is driven on top
(5) it is machined with duct B (50) and duct C (51), slurry channel and annular space B (17), duct C (51) are driven in duct B (50) connection top
Connected pore channel A (18) and well head discharge pipe；
The cross-over sub (10) is machined with duct D (100), duct E (101) and check valve (102), cross-over sub (10) lower part
Connect conventional drilling tool (11) and drill bit (12)；
Double-wall drill pipe (9), cross-over sub (10), conventional drilling tool (11) and drill bit (12) constitute underground after connecting according to this from top to bottom
Drill assembly；
The drilling well pump group (1) drives (2) by top according to this, top is driven adaptive device duct B (50), double-wall drill pipe annular space B (17), turned
Short circuit duct E (101), conventional drilling tool (11) and drill bit (12) is changed to be connected to shaft bottom；Pass through cross-over sub hole according to this by shaft bottom again
The discharge pipe that adaptive device duct C (51) return to well head is driven on road D (100), double-wall drill pipe duct A (18), top；
Marine riser (20) is connected to above conventional preventer group (7), and auxiliary pump installation (3) passes through marine riser (20) and double-wall drill pipe
(9) external annular space connection；
Data monitoring control system (4) connect with auxiliary pump installation (3) and monitors the flow of auxiliary pump installation (3).
2. a kind of double-gradient well drilling system according to claim 1, it is characterised in that: drive the well of adaptive device (5) on top
Dedicated choke manifold (19) are accessed on mouth discharge pipe.
3. a kind of double-gradient well drilling system according to claim 2, it is characterised in that: the mating brill of dedicated choke manifold (19)
Well throttle valve, data monitoring control system (4) connect and monitor drilling well throttle valve.
4. a kind of double-gradient well drilling system, including drilling well pump group (1), top drive (2), auxiliary pump installation (3), data monitoring control system
It unites (4), top is driven adaptive device (5), rotation blow-out release device (6), conventional preventer group (7), casing (8), double-wall drill pipe (9), turned
Change short circuit (10), conventional drilling tool (11) and drill bit (12), it is characterised in that:
The double-wall drill pipe (9) is made of concentric interior drilling rod (91) and outer drilling rod (90), interior drilling rod (91) and outer drilling rod (90)
Between constitute annular space B (17), the inside of interior drilling rod (91) forms duct A (18)；Annular space B (17) is used to convey to shaft bottom first-class
Body, duct A (18) are that first fluid returns out runner, and adaptive device (5) are driven on double-wall drill pipe (9) top connection top, and lower part connection turns
Change short circuit (10)；
The rotary joint that adaptive device (5) are mounted between top drive (2) and double-wall drill pipe (9) is driven on the top, and adaptive device is driven on top
(5) it is machined with duct B (50) and duct C (51), slurry channel and annular space B (17), duct C (51) are driven in duct B (50) connection top
Connected pore channel A (18) and well head discharge pipe；
The cross-over sub (10) is machined with duct D (100), duct E (101) and check valve (102), cross-over sub (10) lower part
Connect conventional drilling tool (11) and drill bit (12)；
Double-wall drill pipe (9), cross-over sub (10), conventional drilling tool (11) and drill bit (12) constitute underground after connecting according to this from top to bottom
Drill assembly；
The drilling well pump group (1) drives (2) by top according to this, top is driven adaptive device duct B (50), double-wall drill pipe annular space B (17), turned
Short circuit duct E (101), conventional drilling tool (11) and drill bit (12) is changed to be connected to shaft bottom；Pass through cross-over sub hole according to this by shaft bottom again
The discharge pipe that adaptive device duct C (51) return to well head is driven on road D (100), double-wall drill pipe duct A (18), top；
Rotation blow-out release device (6) is connected to above conventional preventer group (7), and auxiliary pump installation (3) passes through rotation blow-out release device (6)
The annular space external with double-wall drill pipe (9) is connected to；
Data monitoring control system (4) connect with auxiliary pump installation (3) and monitors the flow of auxiliary pump installation (3).
5. a kind of double-gradient well drilling system according to claim 4, it is characterised in that: drive the well of adaptive device (5) on top
Dedicated choke manifold (19) are accessed on mouth discharge pipe.
6. a kind of double-gradient well drilling system according to claim 5, it is characterised in that: the mating brill of dedicated choke manifold (19)
Well throttle valve, data monitoring control system (4) connect and monitor drilling well throttle valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820112572.2U CN208900028U (en) | 2018-01-23 | 2018-01-23 | A kind of double-gradient well drilling system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111395962A (en) * | 2020-05-13 | 2020-07-10 | 吉林大学 | Sea natural gas hydrate gas lift reverse circulation well drilling system and exploitation method |
| CN113250617A (en) * | 2021-06-28 | 2021-08-13 | 中国石油大学(北京) | Multi-gradient pressure control drilling system |
-
2018
- 2018-01-23 CN CN201820112572.2U patent/CN208900028U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111395962A (en) * | 2020-05-13 | 2020-07-10 | 吉林大学 | Sea natural gas hydrate gas lift reverse circulation well drilling system and exploitation method |
| CN111395962B (en) * | 2020-05-13 | 2024-04-26 | 吉林大学 | Sea area natural gas hydrate gas lift reverse circulation drilling system and exploitation method |
| CN113250617A (en) * | 2021-06-28 | 2021-08-13 | 中国石油大学(北京) | Multi-gradient pressure control drilling system |
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