CN106401463B - A kind of well system and its method for improving frozen soil layer drilling efficiency - Google Patents
A kind of well system and its method for improving frozen soil layer drilling efficiency Download PDFInfo
- Publication number
- CN106401463B CN106401463B CN201610940846.2A CN201610940846A CN106401463B CN 106401463 B CN106401463 B CN 106401463B CN 201610940846 A CN201610940846 A CN 201610940846A CN 106401463 B CN106401463 B CN 106401463B
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- liquid nitrogen
- nitrogen
- soil layer
- frozen soil
- coiled tubing
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Classifications
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/008—Drilling ice or a formation covered by ice
-
- 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
- E21B21/12—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
-
- 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
- E21B36/00—Heating, cooling, insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/001—Cooling arrangements
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
Abstract
The invention discloses a kind of well systems and its method for improving frozen soil layer drilling efficiency, using tripping in well drilling pipe column, open nitrogen compressor, high pressure pump group；Liquid nitrogen is pumped into pit shaft from coiled tubing, provides power to down-hole motor, PDC drill bit cutting bottom rock starts drilling operation；Liquid nitrogen is sprayed through bit nozzle, is formed liquid nitrogen injection, is coordinated the cutting of PDC drill bit；Nitrogen cutting carring is returned along annular space is recycled to ground, is recycled by desander, back-pressure valve, gas purifier；It is drilled into destination layer position and completes drilling operation.Liquid nitrogen Fracturing of the present invention results from extension conducive to rock interior crackle, effectively improves efficiency of breaking rock；Liquid nitrogen temperature is extremely low, and the vaporization heat absorption during upper return, and effectively inhibits gas hydrate dissociation, keeps wellbore stability, prevents the generation of underground complexity；In operation process, liquid nitrogen recycles, and technological process is simple, economical, and live applicability is good.
Description
Technical field
Frozen soil layer drilling technology field more particularly to a kind of raising frozen soil layer drilling efficiency the invention belongs to energy extraction
Well system and its method.
Background technology
Gas hydrates are formed with water under the conditions of high pressure low temperature by natural gas, are distributed widely in halmeic deposit
Or the class ice-like crystalline material in the permanent freezing layer of land.Gas hydrates with its large storage capacity, distribution is wide, energy density is high,
The features such as cleanliness without any pollution, has become a big hot spot of contemporary energy industry development.Particularly the day of energy shortage in recent years is increasingly
It is acute so that various countries focus more on, it is explored for numerous and confused increasing and the dynamics of developmental research.
In recent years, China is also regional in South Sea Shenhu sea area, Qinghai Province Qilian mountains permafrost band and Tianjun County wood
Success bores and obtains gas hydrates.Estimate according to expert, China Qinghai-Tibet Platean (including regional in the wood of the Qilian mountains) permafrost region natural gas
The maximum oil in place of hydrate is 2.98 × 1014m3, the top circle buried depth of hydrate zone is generally tens meters to 200m, bottom
Boundary's buried depth is 100m~1500m.
The gas hydrates that land frozen soil layer certain depth is hidden in tax carry out exploration and development, and drilling well is essential
Important means.Frozen soil layer it is sensitive to temperature anomaly the characteristics of so that the region is complicated using conventional drilling operating type underground
It takes place frequently, drilling efficiency is relatively low, is mainly shown as：(1) in drilling operation course pit shaft surrounding formation stress and temperature change
It will lead to gas hydrate dissociation.When solid hydrate plays cementing or supporting role, decomposition can inherently cause the borehole wall
It caves in；And decomposing the moisture generated can make clay mineral hydration swelling influence wellbore stability.(2) between drilling fluid and stratum
Heat absorption can cause the critical performance parameters (such as viscosity, chemical stability) of drilling fluid to change when heat exchange and decomposition of hydrate
Become, so as to cause clear rock and take rock difficulty.(3) gas that decomposition of hydrate generates enters pit shaft, may cause overflow even
Gas blowout accident；If temperature and pressure condition is appropriate during being returned on gas, hydrate can be also generated at the positions such as drilling rod and valve
Embolism.
At present, land frozen soil region main decomposition inhibit method carry out drillng operation, i.e., using preferred drilling fluid property with
Density maintains borehole pressure, cools down drilling fluid and the related drilling parameter of adjustment, gas hydrates are maintained to stable shape
State is crept into.The drilling fluid property that scene is usually used in frozen soil layer drilling operation is：Low temperature drilling fluid and oil base drilling fluid, but two
There is certain deficiencies by person：(1) Low temperature drilling fluid is mainly by NaCl, KCl or CaCl2Solution adds in various as base fluid
Inorganic agent is equipped, extremely unstable in low temperature in plateau area, is easily decomposed into liquid phase and solid phase, can not meet job requirements；(2)
Oil base drilling fluid has high osmosis, and in containing fissare frozen soil layer drilling process, the leakage of drilling fluid can be to fragile height
Former environment causes serious pollution.Above it is found that there is presently no a kind of effective method come realize to permafrost region safety,
Quickly, economic, environmental protection drilling, the serious process for constraining the exploitation of permafrost region natural gas hydrate exploration.
In conclusion underground caused by gas hydrate dissociation is complicated in existing frozen soil layer drilling well and environmental pollution is asked
Topic.
Invention content
The purpose of the present invention is to provide a kind of well systems and its method for improving frozen soil layer drilling efficiency, it is intended to solve
Underground complexity and problem of environmental pollution caused by gas hydrate dissociation in existing frozen soil layer drilling well are solved, realizes that land is permanent
Safety, quick, economic, environmental protection drilling well in frozen soil layer.
The invention is realized in this way a kind of method for improving frozen soil layer drilling efficiency, the raising frozen soil layer drilling efficiency
Method include：
Tripping in well drilling pipe column opens nitrogen compressor, high pressure pump group；Liquid nitrogen is pumped into pit shaft from coiled tubing, to underground
Motor provides power, and PDC drill bit cutting bottom rock starts drilling operation；
Liquid nitrogen is sprayed through bit nozzle, is formed liquid nitrogen injection, is coordinated the cutting of PDC drill bit；
Nitrogen cutting carring returns to ground along annular space, is recycled by desander, gas purifier, final logical
It crosses manifold of ground and reenters nitrogen storage tank and recycled；
Destination layer position is drilled into, working rig is closed, closes pump, acts drillng operation tubing string, complete drilling operation.
Further, the running well drilling pipe column needs to carry out before opening nitrogen compressor, high pressure pump group：
Ground assembles downhole assembly：According to design requirement, various sizes of coiled tubing is selected, coiled tubing is connected
Device, check-valves are connect, urgent separating tool is sequentially arranged at the end of coiled tubing；It is needed to select different types of well according to construction
Lower drill assembly installs non-rotating connector, down-hole motor, PDC drill bit or propeller successively in urgent separating tool end, injection
Drill bit；
By coiled tubing work vehicle, manifold of ground, the respective lines of high pressure pump group and implement are attached.
Another object of the present invention is to provide a kind of well system for improving frozen soil layer drilling efficiency, raising frozen soil layer brill
The well system of well efficiency includes：Coiled tubing work vehicle, liquid nitrogen preparation system, nitrogen recycling processing system, down-hole equipment group
Conjunction, manifold of ground, high pressure pump group, wellhead assembly；
The coiled tubing work vehicle is used to implement the feeding of double thermal insulation coiled tubing, prevents working fluid nitrogen from vaporizing；
Liquid nitrogen preparation system is used to prepare liquid nitrogen；
Nitrogen recycling processing system utilizes for recycling nitrogen circulation；
Downhole assembly is used for fractured rock, is crept into；
High pressure pump group is used to be pumped into liquid nitrogen into pit shaft.
Further, liquid nitrogen preparation system includes nitrogen storage tank, nitrogen compressor.
Further, nitrogen recycling processing system includes gas purifier, back-pressure valve, desander；
Back-pressure valve ensures job safety for controlling wellbore annulus pressure.
Further, downhole tool combination using power drilling tool cooperation PDC drill bit or using propeller coordinate flow jet flow drill into
Row operation；When carrying out operation using power drilling tool cooperation PDC drill bit, downhole tool combination includes coiled tubing connector, non-return
Valve, urgent separating tool, non-rotating connector, down-hole motor, PDC drill bit；
When carrying out operation using propeller cooperation flow jet flow drill, downhole tool combination includes coiled tubing connector, non-return
Valve, urgent separating tool, propeller, flow jet flow drill.
The well system and its method provided by the invention for improving frozen soil layer drilling efficiency replaces conventional drilling using liquid nitrogen
Liquid, cooperation DRILLING WITH COILED TUBING carry out drillng operation, thus thoroughly solve in frozen soil layer drilling process due to temperature and pressure
The problems such as underground is complicated caused by change ensure that the safety of drillng operation.Meanwhile the low temperature Fracturing of liquid nitrogen, conducive to rock
The generation of stony fracture line induces crack propagation simultaneously, so as to fulfill efficient rock-breaking.Made using coiled tubing instead of conventional drill rod
Industry avoids the rotation of drill string in operation process, prevents from generating heat with wall friction, while simplify work flow, reduce
Operating cost.
In the drilling mode, liquid nitrogen is pumped into shaft bottom using coiled tubing, since liquid nitrogen has extremely low (about -195.8
DEG C) temperature, far below the temperature of bored frozen soil layer, Free water in frozen soil layer can be freezed, prevent ground ice in frozen soil layer
Melt, it is often more important that inhibit the decomposition of gas hydrates in frozen soil layer, draw so as to avoid gas hydrate dissociation
The underground risen is complicated.
Liquid nitrogen can substantially reduce shaft bottom surrounding rock temperature as drilling fluid so that rock interior particle generates receipts
Compression deformation.Due to rock be by the polycrystal of the mineral composition of a variety of different heat expansion coefficients, in liquid nitrogen cooling procedure due to
The difference of each Mineral deformation amount has local stress generation between particle, and in the weaker place of particle glue-joint strength or microfissure point
End generates stress concentration effect, and fracturing effect can be caused to rock when the cementing strength between stress value is more than particle.In addition,
Contained Free water glaciation under the cold service of liquid nitrogen in bottom rock, volume, which can expand, generates larger extruding force,
Make the cement between rock particles that rupture failure occur, crack.The fracturing effect of liquid nitrogen is conducive to bottom rock crackle
It generates and the extension of original crack extends, conducive to the broken of rock.Under lasting liquid nitrogen impact and bit cutting effect, landwaste
It is peeled off from bottom rock parent, new scar appears, and so as to fulfill lasting broken rock, improves drilling efficiency.
Due to the density (0.81g/m of liquid nitrogen3) relatively low, shaft bottom is constantly in under-balanced state in drilling process, reduces
The chip hold down effect of shaft bottom landwaste；During being returned on liquid nitrogen annular space, with the change of temperature and pressure, it can gradually gasification expand, increase
Added in annular space on return discharge capacity, be conducive to returning out for landwaste；It is the process constantly absorbed heat that vaporization is returned on liquid nitrogen, can be effectively
The temperature of pit shaft frozen soil layer is reduced, keeps the stabilization of the frozen soil layer borehole wall.On return to the nitrogen of well head by desanding and purification, carry out
Recycling is realized and is recycled.
The well system and its method provided by the invention for improving frozen soil layer drilling efficiency, is bored with currently used frozen soil layer
Well operations method is compared and is had the following advantages：
(1) liquid nitrogen Fracturing results from extension conducive to rock interior crackle, efficiency of breaking rock is effectively improved, in frozen soil
Rate of penetration is far above conventional drilling mode in layer；
(2) after liquid nitrogen injection effect, the liquid nitrogen of low-density causes near wellbore zone always in under-balanced state, conducive to the later stage
Mining operations；
(3) liquid nitrogen temperature is extremely low, and the vaporization heat absorption during upper return, and effectively inhibits gas hydrate dissociation, keeps
Wellbore stability prevents the generation of underground complexity；
(4) in operation process, liquid nitrogen recycles, and technological process is simple, economical, and live applicability is good.
The present invention is applied to land frozen soil layer drillng operation using liquid nitrogen as drilling fluid cooperation DRILLING WITH COILED TUBING,
And a whole set of arrangement and method for construction is formd, it solves well common since temperature and pressure transformation causes in current frozen soil layer drillng operation
Gas hydrate dissociation, the borehole problems such as borehole well instability；Meanwhile the low temperature Fracturing of liquid nitrogen, conducive to shaft bottom rock
The generation and extension of stone face crack under the shear action of drill bit, improve efficiency of breaking rock；Since the density of liquid nitrogen is relatively low,
Underbalance effect is realized in shaft bottom, chip hold down effect is reduced, using shaft bottom broken rock and Qing Yan, so as to improve frozen soil layer drillng operation
Drilling efficiency.
Description of the drawings
Fig. 1 is the method flow diagram provided in an embodiment of the present invention for improving frozen soil layer drilling efficiency
Fig. 2 is the well system schematic diagram provided in an embodiment of the present invention for improving frozen soil layer drilling efficiency.
Fig. 3 is downhole tool combination signal when well system provided in an embodiment of the present invention uses mud motor
Figure.
Fig. 4 is downhole tool combination diagram when well system provided in an embodiment of the present invention uses flow jet flow drill.
Fig. 5 is bottom rock provided in an embodiment of the present invention Cracking Mechanism figure under liquid nitrogen fracturing and bit cutting.
In figure：1st, coiled tubing work vehicle；2nd, liquid nitrogen preparation system；3rd, nitrogen recycling processing system；4th, down-hole equipment group
It closes；5th, manifold of ground；6th, high pressure pump group；7th, wellhead assembly；8th, annular space；9th, coiled tubing；10th, bottom rock；11st, liquid nitrogen is penetrated
Stream；12nd, Original Cracks；21st, nitrogen storage tank；22nd, nitrogen compressor；31st, gas purifier；32nd, back-pressure valve；33rd, desander；
41st, coiled tubing connector；42nd, check-valves；43rd, urgent separating tool；44th, non-rotating connector；45th, down-hole motor；46、PDC
Drill bit；47th, propeller；48th, flow jet flow drill.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
The application principle of the present invention is further described below in conjunction with the accompanying drawings.
As shown in Figure 1, the method provided in an embodiment of the present invention for improving frozen soil layer drilling efficiency, including：
S101：Tripping in well drilling pipe column opens nitrogen compressor, high pressure pump group；Liquid nitrogen is pumped into pit shaft from coiled tubing, is given
Down-hole motor provides power, and PDC drill bit cutting bottom rock starts drilling operation；
S102：Liquid nitrogen is sprayed through bit nozzle, is formed liquid nitrogen injection, is coordinated the cutting of PDC drill bit；
S103：Nitrogen cutting carring is returned along annular space is recycled to ground, by desander, back-pressure valve, gas purifier into
Row recovery processing, reenters nitrogen storage tank eventually by manifold of ground and is recycled；
S104：Destination layer position is drilled into, working rig is closed, closes pump, acts operation well drilling pipe column, complete drilling operation.
Further, the running well drilling pipe column needs to carry out before opening nitrogen compressor, high pressure pump group：
Assemble downhole assembly：According to design requirement, various sizes of coiled tubing is selected, coiled tubing is connected
Device, check-valves, urgent separating tool are sequentially arranged at the end of coiled tubing；It is needed to select different types of underground according to construction
Tool combinations install non-rotating connector, down-hole motor, PDC drill bit or propeller, jet drilling successively in urgent separating tool end
Head；
By coiled tubing work vehicle, manifold of ground, the respective lines of high pressure pump group and implement are attached.
Raising frozen soil layer drilling efficiency well system provided in an embodiment of the present invention mainly includes：Coiled tubing work vehicle 1,
Liquid nitrogen preparation system 2, nitrogen recycling processing system 3, downhole assembly 4, manifold of ground 5, high pressure pump group 6, wellhead assembly 7
Deng.Liquid nitrogen preparation system 2 includes nitrogen storage tank 21, nitrogen compressor 22.Nitrogen recycling processing system 3 includes gas purifier
31, back-pressure valve 32, desander 33.The form of power drilling tool cooperation PDC drill bit may be used in downhole assembly 4, can also adopt
Coordinate flow jet flow drill form with propeller.
Using the downhole assembly structure of power drilling tool cooperation PDC drill bit form as shown in figure 3, connecting including coiled tubing
Connect device 41, check-valves 42, urgent separating tool 43, non-rotating connector 44, down-hole motor 45, PDC drill bit 46；
Using the downhole assembly of jet bit form as shown in figure 4, including coiled tubing connector 41, check-valves
42, urgent separating tool 43, propeller 47, flow jet flow drill 48.
Below in conjunction with the accompanying drawings and the application principle of the present invention is further retouched in the technological process of progress frozen soil layer drillng operation
It states.
(1) downhole assembly 4 is assembled.According to design requirement, various sizes of coiled tubing 9 is selected, by coiled tubing
Connector 41, check-valves 42, urgent separating tool 43 are sequentially arranged at the end of coiled tubing 9.It needs to select not according to construction
The downhole assembly of same type installs non-rotating connector 44, down-hole motor 45, PDC successively in urgent 43 end of separating tool
Drill bit 46 or propeller 47, jet bit 48；
(2) by coiled tubing work vehicle 1, manifold of ground 5, the respective lines of high pressure pump group 6 and other equipment are connected
It connects；
(3) tripping in well drilling pipe column opens nitrogen compressor 22, high pressure pump group 6, liquid nitrogen is pumped into pit shaft from coiled tubing 9,
Power is provided for down-hole motor 45 so that PDC drill bit 46 cuts bottom rock, starts drilling operation；
(4) liquid nitrogen is sprayed through 46 nozzle of drill bit, forms liquid nitrogen injection 11 (such as Fig. 5 A), and the fracturing effect of liquid nitrogen is conducive to shaft bottom
The generation of 10 crackle of rock and the extension extension (such as Fig. 5 B) of Original Cracks 12 coordinate the shear action of PDC drill bit 46 (as schemed
5C), efficiency of breaking rock is improved,；
(5) liquid nitrogen gasification in annular space 8 absorbs heat, reduces the temperature of frozen soil layer around pit shaft, keeps wellbore stability；
(6) nitrogen cutting carring returns to ground along annular space 8, and by desander 33, gas purifier 31 is carried out at recycling
Reason reenters the realization of nitrogen storage tank 21 eventually by manifold of ground 5 and recycles；
(7) destination layer position is drilled into, closes working rig, closes pump, acts working string, completes drilling operation.
The present invention frozen soil layer carry out drilling operation when, inhibit the decomposition of gas hydrates, with preventing in frozen soil layer
The thawing of lower ice can effectively solve the underground complexity that current frozen soil layer drillng operation is encountered, ensure job safety；Colleague
Liquid nitrogen Fracturing and the effect of shaft bottom underbalance are conducive to shaft bottom broken rock and shaft bottom Qing Yan, and frozen soil layer drilling efficiency is improved so as to reach
Purpose.
The present invention is applied to land frozen soil layer drillng operation using liquid nitrogen as drilling fluid cooperation DRILLING WITH COILED TUBING,
And a whole set of arrangement and method for construction is formd, it solves well common since temperature and pressure transformation causes in current frozen soil layer drillng operation
Gas hydrate dissociation, the borehole problems such as borehole well instability；Meanwhile the low temperature Fracturing of liquid nitrogen, conducive to shaft bottom rock
The generation and extension of stone face crack under the shear action of drill bit, improve efficiency of breaking rock；Since the density of liquid nitrogen is relatively low,
Underbalance effect is realized in shaft bottom, chip hold down effect is reduced, using shaft bottom broken rock and Qing Yan, so as to improve frozen soil layer drillng operation
Drilling efficiency.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should all be included in the protection scope of the present invention.
Claims (6)
- A kind of 1. method for improving frozen soil layer drilling efficiency, which is characterized in that the method for the raising frozen soil layer drilling efficiency includes：Tripping in well drilling pipe column opens nitrogen compressor, high pressure pump group；Liquid nitrogen is pumped into pit shaft from coiled tubing, to down-hole motor Power is provided, PDC drill bit cutting bottom rock starts drilling operation；Liquid nitrogen is sprayed through bit nozzle, is formed liquid nitrogen injection, is coordinated the cutting of PDC drill bit；Nitrogen cutting carring is returned along annular space is recycled to ground, is recycled by desander, gas purifier, final logical It crosses manifold of ground and reenters nitrogen storage tank and recycled；Destination layer position is drilled into, working rig is closed, closes pump, acts operation well drilling pipe column, complete drilling operation.
- 2. the method for frozen soil layer drilling efficiency is improved as described in claim 1, which is characterized in that the running well drilling pipe column, It needs to carry out before opening nitrogen compressor, high pressure pump group：Ground assembling downhole tool combination：According to design requirement, various sizes of coiled tubing is selected, coiled tubing is connected Device, check-valves, urgent separating tool are sequentially arranged at the end of coiled tubing；It is needed to select different types of underground according to construction Tool combinations install non-rotating connector, down-hole motor, propeller, jet bit successively in urgent separating tool end；By coiled tubing work vehicle, manifold of ground, the respective lines of high pressure pump group and implement are attached.
- 3. the well system of the raising frozen soil layer drilling efficiency of a kind of the method as described in claim 1, which is characterized in that this is carried The well system of high frozen soil layer drilling efficiency includes：Coiled tubing work vehicle, liquid nitrogen preparation system, nitrogen recycling processing system, Downhole assembly, manifold of ground, high pressure pump group, wellhead assembly；The coiled tubing work vehicle is used to implement the feeding of double thermal insulation coiled tubing, prevents working fluid nitrogen from vaporizing；Liquid nitrogen preparation system is used to prepare liquid nitrogen；Nitrogen recycling processing system utilizes for recycling nitrogen circulation；Downhole assembly is used for fractured rock, is crept into；High pressure pump group is used to be pumped into liquid nitrogen into pit shaft.
- 4. the well system of frozen soil layer drilling efficiency is improved as claimed in claim 3, which is characterized in thatLiquid nitrogen preparation system includes nitrogen storage tank, nitrogen compressor.
- 5. the well system of frozen soil layer drilling efficiency is improved as claimed in claim 3, which is characterized in that nitrogen recycling processing system System includes gas purifier, back-pressure valve, desander；Back-pressure valve ensures job safety for controlling wellbore annulus pressure.
- 6. the well system of frozen soil layer drilling efficiency is improved as claimed in claim 3, which is characterized in that downhole assembly is adopted Coordinate PDC drill bit with power drilling tool or operation is carried out using propeller cooperation flow jet flow drill；PDC drill bit is coordinated using power drilling tool When carrying out operation, downhole tool combination includes coiled tubing connector, check-valves, urgent separating tool, non-rotating connector, underground Motor, PDC drill bit；Using propeller cooperation flow jet flow drill carry out operation when, downhole tool combination include coiled tubing connector, check-valves, tightly Anxious separating tool, propeller, jet bit.
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| CN107435525B (en) * | 2017-09-14 | 2023-04-07 | 吉林大学 | Heat pipe type magnetic refrigeration drilling flushing fluid underground cooling drilling tool |
| CN108755676B (en) * | 2018-05-05 | 2020-06-26 | 深圳市蛇口招商港湾工程有限公司 | Anchor cable construction method under water-rich sand layer condition |
| CN112539028A (en) * | 2019-09-20 | 2021-03-23 | 中国石油化工股份有限公司 | Monitoring device and monitoring method for temperature change in frozen soil layer drilling process |
| CN113185956B (en) * | 2020-01-14 | 2023-04-25 | 中国石油天然气集团有限公司 | Application of natural gas condensate as circulating medium |
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| CN102213090A (en) * | 2011-06-03 | 2011-10-12 | 中国科学院广州能源研究所 | Method and device for exploiting natural gas hydrate in permafrost region |
| CN103104205A (en) * | 2011-11-14 | 2013-05-15 | 母东艳 | Nitrogen well-drilling method in well-drilling field |
| CN103195364A (en) * | 2013-04-19 | 2013-07-10 | 中国石油大学(北京) | Method and device for reducing well-bottom annulus confining pressure and improving radial horizontal well rock breaking efficiency |
| CN103573233A (en) * | 2013-11-21 | 2014-02-12 | 辽宁石油化工大学 | Method and device for exploiting natural gas hydrate in cryolithozone |
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|---|---|---|---|---|
| KR20130051079A (en) * | 2011-11-09 | 2013-05-20 | 한국지질자원연구원 | Sub-marine sediment analysis apparatus and analysis method using the same |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102213090A (en) * | 2011-06-03 | 2011-10-12 | 中国科学院广州能源研究所 | Method and device for exploiting natural gas hydrate in permafrost region |
| CN103104205A (en) * | 2011-11-14 | 2013-05-15 | 母东艳 | Nitrogen well-drilling method in well-drilling field |
| CN103195364A (en) * | 2013-04-19 | 2013-07-10 | 中国石油大学(北京) | Method and device for reducing well-bottom annulus confining pressure and improving radial horizontal well rock breaking efficiency |
| CN103573233A (en) * | 2013-11-21 | 2014-02-12 | 辽宁石油化工大学 | Method and device for exploiting natural gas hydrate in cryolithozone |
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