CN114135252A - Injection process of double-pipe double-gradient drilling spacer fluid - Google Patents
Injection process of double-pipe double-gradient drilling spacer fluid Download PDFInfo
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- CN114135252A CN114135252A CN202111488309.6A CN202111488309A CN114135252A CN 114135252 A CN114135252 A CN 114135252A CN 202111488309 A CN202111488309 A CN 202111488309A CN 114135252 A CN114135252 A CN 114135252A
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- 238000005553 drilling Methods 0.000 title claims abstract description 128
- 239000012530 fluid Substances 0.000 title claims abstract description 127
- 125000006850 spacer group Chemical group 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000002347 injection Methods 0.000 title claims abstract description 27
- 239000007924 injection Substances 0.000 title claims abstract description 27
- 230000008569 process Effects 0.000 title claims abstract description 21
- 239000013535 sea water Substances 0.000 claims abstract description 54
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 238000002955 isolation Methods 0.000 claims abstract description 31
- 230000001105 regulatory effect Effects 0.000 claims abstract description 15
- 230000001276 controlling effect Effects 0.000 claims abstract description 8
- 239000004568 cement Substances 0.000 claims description 8
- 230000009977 dual effect Effects 0.000 claims description 2
- 238000002513 implantation Methods 0.000 claims 2
- 230000004888 barrier function Effects 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 230000002706 hydrostatic effect Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0007—Equipment or details not covered by groups E21B15/00 - E21B40/00 for underwater installations
Abstract
The invention discloses an injection process of a double-layer pipe double-gradient drilling spacer fluid, wherein when a double-gradient pressure system is established, drilling fluid is injected from the annulus of a double-layer pipe, and enters the annulus of a sleeve to a mud line after the double-layer pipe is filled with the drilling fluid; the marine riser auxiliary pipeline injects isolation liquid from the vicinity of the blowout preventer stack to replace seawater in the annular space of the marine riser, and the large outer annular space consists of seawater, the isolation liquid and drilling fluid from top to bottom; the underground hydraulic drive lifting pump regulates and controls the drilling fluid to an optimal position. When the drilling is started, the position of the isolation liquid is always regulated and controlled by the lifting pump so as to ensure that the bottom hole pressure is in a safe operation window at any time. And when the bottom hole pressure exceeds the regulating and controlling range of the isolation liquid, the drilling fluid system is replaced, a new double-gradient pressure system is formed by the injected new drilling fluid system, seawater and the isolation liquid, and the isolation liquid moves up and down to regulate and control the bottom hole pressure. The injection process of the double-layer pipe double-gradient drilling spacer fluid disclosed by the invention realizes the accurate injection of the spacer fluid and provides conditions for monitoring the liquid level of the spacer fluid and regulating and controlling the bottom hole pressure.
Description
Technical Field
The invention relates to the field of deepwater drilling, in particular to an injection process of a double-layer pipe double-gradient drilling spacer fluid.
Background
With the increasing severity of energy problems, oil and gas resources in land and shallow sea areas are not enough to meet the requirements of human beings, and the exploration and development of deep sea oil and gas resources become an important direction for energy development in the world nowadays. However, deep water drilling has the problems of narrow safety density window, difficult wellbore pressure control, poor well wall stability and the like caused by weak cementation of seabed strata, and causes great drilling safety risk and high cost.
Aiming at the problem, a deepwater dual-gradient drilling technology is often adopted to solve the problem, two different liquid column pressure gradients exist in a borehole with the same size, namely two gradients from the sea surface to the seabed and from the seabed to the well bottom, so that the density of fluid in an annular space in the well is the same as or close to that of seawater, the reference point of the pressure gradient is changed from the water surface to the seabed, and compared with the conventional drilling, the originally narrow interval between the formation pore pressure and the fracture pressure is relatively enlarged. However, the dual gradient drilling technology that is mature at present is expensive and monopolized by foreign countries.
The double-layer pipe double-gradient drilling technology is characterized in that on the basis of double-gradient drilling, a double-layer pipe is adopted, an underground lifting pump is additionally arranged to lift drilling fluid from the double-layer pipe to the water surface, and a mud line upper annular space and a mud line lower annular space form a double-gradient hydrostatic column, namely a seawater hydrostatic column and a drilling fluid hydrostatic column; based on the change of the position of the isolation liquid, the water surface flow control unit is regulated and controlled, the lift and the discharge capacity of the underground lifting pump are regulated and controlled, the bottom pressure of the large outer ring empty well is regulated and controlled, the bottom pressure change is adapted, and the drilling safety is guaranteed.
Therefore, in order to ensure that the bottom pressure is within a safety window at any time in the drilling process, ensure the realization of a double-pipe double-gradient drilling technology, improve the drilling efficiency and reduce the loss, a method for accurately and efficiently injecting the spacer fluid is urgently needed, and guarantee is provided for the safe, efficient and economic development of deep-sea oil and gas.
Disclosure of Invention
The invention aims to provide a double-pipe double-gradient well drilling spacer fluid injection process, which provides conditions for monitoring the spacer fluid level, regulating and controlling the bottom hole pressure and solving the problem of narrow window of deep water well drilling safety density.
The technical scheme adopted by the invention is that the system for the injection process of the double-layer pipe double-gradient drilling isolation liquid is characterized by comprising a double-layer pipe, a double-layer pipe adapter, a sleeve, an underground hydraulic drive lifting pump, a screw motor, a drill bit, a blowout preventer stack, drilling fluid, isolation liquid, seawater, a drilling fluid backflow pipeline, a drilling fluid injection pipeline, a flow control unit, a slurry pump, a slurry tank, a seawater supplementing and returning pipeline, a marine riser auxiliary pipeline, a one-way valve, a metering pump stack and a metering tank;
the isolation liquid is a partition type special gel with the viscosity of 50000mpa.s and the density of 1.0-1.2 g/cm3And the drilling fluid is insoluble in seawater and the drilling fluid, and the density of the drilling fluid is between that of the seawater and the drilling fluid.
A double-pipe double-gradient well drilling spacer fluid injection process comprises the following steps:
step 2, determining a required drilling fluid system;
step 3, putting the double-layer pipe string until reaching the cement plug;
step 4, calculating and preparing the drilling fluid amount enough to replace the seawater in the annular space of the casing;
step 5, injecting a certain amount of calculated drilling fluid into the double-layer pipe annulus to be close to a large outer annulus mud line, and replacing the seawater in the casing pipe after the pipe string is put into the casing pipe;
step 6, injecting a spacer fluid into the riser auxiliary pipeline near the mud line to replace seawater in the annular part of the riser;
and 8, drilling a cement plug, normally drilling, and regulating and controlling the lifting pump while drilling.
When the adjustment of a double-gradient pressure system consisting of seawater, isolation liquid and drilling fluid cannot meet the bottom hole pressure requirement of continuous drilling, namely the adjustment and control range of the isolation liquid is exceeded, the drilling fluid system needs to be replaced. The method comprises the following steps:
and 9, pulling out the drill, setting the casing pipe and performing cementing operation to finish well cementation.
And step 10, repeating the steps 2-8.
The invention is also characterized in that:
the isolation liquid is a partition type special gel with the viscosity of 50000mpa.s and the density of 1.0-1.2 g/cm3. Like a movable piston, is insoluble in seawater and drilling fluid, has a density between the two, and can separate seawater above the mud line from drilling fluid below the mud line.
In step 6, the metering pump set pumps the isolation liquid from the isolation liquid into the marine riser auxiliary pipeline by using the metering tank, and the isolation liquid flows through the check valve and then enters the large outer annulus to separate the seawater and the isolation liquid; after step 6, the whole large outer annulus is composed of seawater, spacer fluid and drilling fluid from top to bottom.
In step 8, with the continuous increase of the drilling depth, the equivalent density of the bottom hole is required to be correspondingly increased, and the up-and-down movement of the isolation liquid level position is controlled through the adjustment of the lift and the discharge capacity of the underground lifting pump, so that the bottom hole pressure is maintained in a safety window; in addition, the position of the isolation liquid can fluctuate at any time according to the bottom hole condition, and the lifting pump works all the time.
The steps 1-8 are to ensure that the drilling fluid equivalent density of each position at the bottom of a well is always within the range of a safe density window through the change of the position of an isolation fluid on the premise of not changing a drilling fluid system; and 9, 10, when the position of the isolation fluid cannot be adjusted to ensure that the bottom hole pressure is positioned in a safety window, a drilling fluid system with higher density needs to be replaced to ensure the drilling safety.
Specifically, the control range of the spacer fluid can be determined according to the upper limit rho and the lower limit rho of the equivalent density of the bottom holee(max)、ρe(min)And drilling fluid density ρmSimultaneous formula rhoegD＝ρwghw+ρmg(D-hw) Back calculating the length h of seawater sectionw(max)And hw(min)And (6) obtaining. Wherein D is the target well depth, ρw、ρmRespectively, sea water density and drilling fluid density.
The injection process of the double-layer pipe double-gradient drilling spacer fluid disclosed by the invention has the following beneficial effects:
(1) the isolating liquid is added between the seawater section and the drilling fluid section, so that the self-adaptability to accidents such as bottom hole pressure change and leakage is strong, the wind risk resistance is high, and the safety is high.
(2) The isolation fluid is added, so that the times of replacing a drilling fluid system, the times of casing running and well cementation are reduced, the well body structure is optimized, and the drilling and production cost is greatly reduced;
(3) and the isolating liquid and the drilling fluid are injected by adopting the marine riser auxiliary pipeline, so that the system is simple in structure and low in operation cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic view of a process for injecting a dual-tube dual-gradient drilling spacer fluid;
FIG. 2 is a schematic diagram of a dual-tube dual-gradient well spacer injection system.
In the figure: 1-seawater replenishing and back-discharging pipeline; 201-metering tank for isolating liquid; 202-a seawater metering tank; 3-a riser auxiliary line; 4-sea level; 5-a one-way valve; 6-seawater; 7-mud line; 8-a catheter; 9-cement slurry; 10-the formation; 11-a hydraulically driven lift pump; 12-surface casing; 13-a drill bit; 14-a screw motor; 15-drilling fluid; 16-double tube outer tube; 17-double-layer tube inner tube; 18-spacer fluid; 19-blowout preventer stack; 20-a riser; 21-a mud pit; 22-drilling fluid return line; 23-drilling fluid injection line; 24-a mud pump; 25-double tube adapter.
Detailed Description
The present invention will be described in detail with reference to the following detailed description and accompanying drawings.
As shown in fig. 1, the injection process system of the dual-pipe dual-gradient drilling spacer fluid comprises a seawater supplementing and back-discharging pipeline 1, a metering tank 2 (comprising a spacer fluid metering tank 201 and a seawater metering tank 202), a marine riser auxiliary pipeline 3, a sea surface 4, a one-way valve 5, seawater 6, a mud line 7, a guide pipe 8, cement slurry 9, a stratum 10, a hydraulic drive lifting pump 11, a surface casing 12, a drill bit 13, a screw motor 14, drilling fluid 15, a dual-pipe outer pipe 16, a dual-pipe inner pipe 17, a spacer fluid 18, a blowout preventer stack 19, a marine riser 20, a mud pit 21, a drilling fluid backflow pipeline 22, a drilling fluid injection pipeline 23, a mud pump 24 and a dual-pipe adapter 25.
The invention relates to a double-pipe double-gradient well drilling spacer fluid injection process, which comprises the following steps of:
specifically, a double-layer pipe is adopted to normally drill according to a conventional drilling mode until the surface casing 12 is lowered and well cementation is completed, and a blowout preventer stack 19 and a riser string 20 are lowered.
Step 2, determining a required drilling fluid 15 system;
in particular, according to the formula Pb＝ρegD＝ρwgH+ρmg (D-H) calculating the density rho of the drilling fluid when the target well depth is Dm(the spacer fluid column length was ignored). Wherein the equivalent density at well depth D ρeBy predicting the downhole safety density windowH is the depth of the seawater, rhow、ρmRespectively, sea water density and drilling fluid density.
3. The lower double-layer pipe string is connected to the cement plug;
4. calculating and preparing 15 amount of drilling fluid enough to replace seawater 6 in the casing annulus;
after the pipe string is put into the large outer annular space, the large outer annular space is filled with seawater 6, the seawater 6 below the large outer annular space mud line 7 needs to be replaced by the drilling fluid 15, and the required amount of the drilling fluid 15 is calculated and prepared for subsequent injection.
5. Injecting calculated quantitative drilling fluid 15 into the double-layer pipe annulus to the position near the large outer ring empty mud line 7, and displacing seawater 6 in the rear sleeve pipe when the pipe string is lowered, wherein the seawater 6 is above the large outer ring empty mud line 7, and the drilling fluid 15 is below the mud line 7;
specifically, the mud pump 24 pumps mud from the mud pit 21 into the drilling fluid injection line 23, flows through the flow control unit, enters the double-pipe annulus, circulates from the inner pipe 17 of the double-pipe to the drilling fluid return line 22, and finally ends at the flow control unit, and at this time, the drilling fluid which is continuously injected enters the large outer annulus, flows through the casing 12, and is filled with the drilling fluid below the mud line 7.
In addition, the entire exterior of the vessel is filled with seawater before the drilling fluid 15 is injected, and as the drilling fluid 15 is injected, it is discharged into the seawater metering tank 202 through the seawater makeup and return line 1.
6. The marine riser subsidiary pipeline 3 injects an isolation liquid 18 near the mud line 7 to replace part of seawater 6, and the large outer annular space consists of the seawater 6, the isolation liquid 18 and the drilling fluid 15 from top to bottom;
specifically, the required spacer fluid 18 is pumped by the metering pump set into the riser attachment line 3 by the metering tank 201, passes through the check valve 5 and enters the vicinity of the large outer annular mud line 7. The required spacer fluid 18 may be miscible with the seawater 6 and drilling fluid 15 and may have a length of not less than 100 meters, and even up to 200 meters, to ensure effective separation of the seawater 6 from the drilling fluid 15. From its length and the size of the wellbore, the volume of injected spacer fluid 18 can be calculated. If the length of the spacer fluid 18 is 150 meters, the required volume of the spacer fluid 18 is injected
The riser sub-line 3, the booster line, and the choke/kill line may be used as spacer fluid injection lines.
The displaced part of the seawater is discharged into the seawater metering tank 202 through the seawater replenishment and return line 1.
7. The underground hydraulic drive lifting pump 11 regulates and controls the spacer fluid 18 to an optimal position;
the actual injection location H of the spacer fluid 18 may be at the location H of the spacer fluid 18 that is currently meeting drilling requirementswThe control unit controls the injection of the drilling fluid on the water surface and the flow of the return pipeline, so that the lift and the discharge of the underground lifting pump 11 are controlled, the position of the isolating liquid 18 is controlled, and the bottom hole pressure meets the requirement of safe drilling.
In particular, spacer fluid 18 position h to meet drilling requirementswFrom the formula rhoegd＝ρwghw+ρmg(d-hw) And (5) obtaining the result through inverse calculation. Where ρ iseIs the equivalent density at any well depth d, in this case the equivalent density at that well depth after the surface casing 12 has been run in.
8. And (4) drilling a cement plug, normally drilling, and regulating and controlling the lifting pump 11 while drilling.
In the normal drilling process, the bottom hole pressure window of the operation section is often an interval value with fluctuation, and the bottom hole pressure and the formation pressure can be dynamically balanced by adjusting the position of the isolating liquid 18 in real time through the lifting pump 11 on the premise of not changing a drilling fluid system. When the bottom hole pressure is larger than the formation pressure, the bottom hole is leaked, the equivalent density value of the bottom hole is required to be reduced, and the isolation liquid 18 is regulated and controlled to enable the position of the isolation liquid to be lowered; when the bottom hole pressure is less than the formation pressure, the bottom hole overflows, at this time, the equivalent density value of the bottom hole is required to be increased, and the isolation fluid 18 is regulated and controlled to enable the position of the isolation fluid to rise.
According to bottom hole equivalent density ρe(min)≤ρe≤ρe(max)Upper and lower limits of and drilling fluid density ρmSimultaneous equation ρegD＝ρwghw+ρmg(D-hw) Back calculating 6-segment length of sea waterhw(max)And hw(min)The control range of the spacer fluid 18 can be determined.
When the regulation of a double-gradient pressure system consisting of seawater, isolation fluid and drilling fluid cannot meet the bottom hole pressure requirement of continuous drilling, namely the regulation range of the isolation fluid 18 is exceeded, the drilling fluid 15 system needs to be replaced. The method comprises the following steps:
9. and (5) pulling out the drill, setting the casing pipe and performing cementing operation to finish well cementation.
In particular, during tripping, the well is ensured to be filled with drilling fluid, so that blowout and collapse of the well wall are prevented. There are two alternatives for tripping:
replacing another drilling fluid system rho into the double-layer pipe through a mud pit 21m1(ρm1>ρe) Similar to conventional drilling, the entire wellbore is filled with the drilling fluid and grouting is continued during tripping to ensure tripping safety.
② grouting once every certain height. The maximum safe tripping height hoThe calculation method is as follows:
from the formula rhoegD-ρpgD＝Δd·g(ρm-ρw) The maximum height delta d allowed to drop of the annular liquid level is obtained through inverse calculation, and then the delta d is substituted into a formula delta d (V)ci-Vp)＝Vp·hoCalculating the maximum drill-tripping height h in case of no grouting by reverse calculationo. Where ρ iseFor bottom hole equivalent density at pull-out, ppTo be the formation pressure coefficient,
(Dciinner diameter of the casing) is the inner volume per meter of the casing, VpThe displacement is the displacement of the beginning of each meter of the drill rod.
10. And (5) repeating the steps 2-8.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. The injection process of the double-layer pipe double-gradient drilling spacer fluid is characterized by comprising the following steps of:
step 1, drilling by adopting a conventional drilling method until the blowout preventer stack and a riser string are completely put in;
step 2, determining a required drilling fluid system;
step 3, putting the double-layer pipe string until reaching the cement plug;
step 4, calculating and preparing the drilling fluid amount enough to replace the seawater in the annular space of the casing;
step 5, injecting the calculated quantitative drilling fluid into the double-layer pipe annulus to the position near the large outer annulus mud line, and replacing seawater in the casing pipe;
step 6, injecting a spacer fluid into the riser auxiliary pipeline near the mud line to replace seawater in the annular part of the riser;
step 7, regulating and controlling the spacer fluid to an optimal position by an underground hydraulic drive lifting pump;
and 8, drilling a cement plug, normally drilling, and regulating and controlling the lifting pump while drilling.
2. The injection process of claim 1, wherein the drilling fluid system is replaced when the dual gradient pressure system regulation of seawater-spacer fluid-drilling fluid fails to meet the bottom hole pressure requirement for continued drilling, i.e., when the isolation fluid regulation range is exceeded; the method comprises the following steps:
step 9, tripping out the drill, setting a casing pipe and performing cementing operation to complete well cementation;
and step 10, repeating the steps 2-8.
3. The injection process of claim 1, wherein the spacer fluid is a barrier specialty gel having a viscosity of 50000mpa.s, a density of 1.0 to 1.2g/cm3, insoluble in seawater and drilling fluid, and having a density between seawater and drilling fluid, for separating seawater above the mud line from drilling fluid below the mud line.
4. The injection process of claim 1 wherein the spacer fluid is injected from a spacer fluid metering tank through a riser sub-line at a theoretical injection rate of
Wherein D isriIs the inner diameter of the riser, DpoIs the outer diameter of a double-wall drill rod hGThe length of the isolating liquid is designed, and the length of the isolating liquid is not less than 100 meters for ensuring the isolating liquid to effectively separate seawater and drilling fluid.
5. The injection process of claim 1, wherein after step 6, the large outer annulus is comprised of seawater, spacer fluid and drilling fluid from top to bottom, and the downhole hydraulically driven lift pump ensures that the bottom hole pressure is always within a safe window by regulating the spacer fluid level.
6. An implantation process according to claim 1, wherein the optimal position of the spacer fluid is d (p)e-ρm)/(ρw-ρm) Where ρ isw、ρmRespectively sea water density and drilling fluid density, d is any well depth, rhoeIs the bottom hole equivalent density.
7. The implantation process of claim 2, wherein the spacer fluid tuning range is D (p)e(min)-ρm)/(ρw-ρm)～D(ρe(max)-ρm)/(ρw-ρm) Where ρ ise(max)、ρe(min)Respectively the upper and lower limits of the equivalent density of the well bottom, D is the target well depth, rhow、ρmRespectively, sea water density and drilling fluid density.
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| CN202111488309.6A CN114135252A (en) | 2021-12-07 | 2021-12-07 | Injection process of double-pipe double-gradient drilling spacer fluid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023124449A1 (en) * | 2022-09-26 | 2023-07-06 | 中国科学院广州能源研究所 | System and method for exploiting natural gas hydrate by underground gas-liquid synergistic pressure reduction |
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|---|---|---|---|---|
| US4083407A (en) * | 1977-02-07 | 1978-04-11 | The Dow Chemical Company | Spacer composition and method of use |
| CN111021958A (en) * | 2019-12-23 | 2020-04-17 | 西南石油大学 | Double-layer coiled tubing and double-gradient drilling system |
| CN112878904A (en) * | 2021-01-25 | 2021-06-01 | 西南石油大学 | Well body structure optimization method of double-pipe double-gradient drilling technology |
| AU2019445862A1 (en) * | 2019-05-13 | 2021-08-19 | Halliburton Energy Services, Inc. | Injectivity and production improvement in oil and gas fields |
| CN113404481A (en) * | 2021-05-27 | 2021-09-17 | 中国海洋石油集团有限公司 | Shaft flow control method based on double-layer continuous pipe double-gradient drilling system |
-
2021
- 2021-12-07 CN CN202111488309.6A patent/CN114135252A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4083407A (en) * | 1977-02-07 | 1978-04-11 | The Dow Chemical Company | Spacer composition and method of use |
| AU2019445862A1 (en) * | 2019-05-13 | 2021-08-19 | Halliburton Energy Services, Inc. | Injectivity and production improvement in oil and gas fields |
| CN111021958A (en) * | 2019-12-23 | 2020-04-17 | 西南石油大学 | Double-layer coiled tubing and double-gradient drilling system |
| CN112878904A (en) * | 2021-01-25 | 2021-06-01 | 西南石油大学 | Well body structure optimization method of double-pipe double-gradient drilling technology |
| CN113404481A (en) * | 2021-05-27 | 2021-09-17 | 中国海洋石油集团有限公司 | Shaft flow control method based on double-layer continuous pipe double-gradient drilling system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023124449A1 (en) * | 2022-09-26 | 2023-07-06 | 中国科学院广州能源研究所 | System and method for exploiting natural gas hydrate by underground gas-liquid synergistic pressure reduction |
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