CN108590595A - A method of it is exploited using F type well groups non-at lithotype gas hydrates - Google Patents
A method of it is exploited using F type well groups non-at lithotype gas hydrates Download PDFInfo
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- CN108590595A CN108590595A CN201810313659.0A CN201810313659A CN108590595A CN 108590595 A CN108590595 A CN 108590595A CN 201810313659 A CN201810313659 A CN 201810313659A CN 108590595 A CN108590595 A CN 108590595A
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- inclined shaft
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- 150000004677 hydrates Chemical class 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000004576 sand Substances 0.000 claims abstract description 28
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 6
- 230000006837 decompression Effects 0.000 claims abstract description 6
- 238000002347 injection Methods 0.000 claims abstract description 6
- 239000007924 injection Substances 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 6
- 238000010276 construction Methods 0.000 claims abstract description 5
- 238000006073 displacement reaction Methods 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 37
- 238000005553 drilling Methods 0.000 claims description 6
- 230000009466 transformation Effects 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000005406 washing Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000007774 longterm Effects 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 238000011549 displacement method Methods 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0099—Equipment or details not covered by groups E21B15/00 - E21B40/00 specially adapted for drilling for or production of natural hydrate or clathrate gas reservoirs; Drilling through or monitoring of formations containing gas hydrates or clathrates
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/043—Directional drilling for underwater installations
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The non-method at lithotype gas hydrates is exploited using F type well groups, the step of this method is as follows the present invention relates to a kind of：Step 1：A bite inclined shaft is bored, the A target spots for being drilled into gas hydrates reservoir and underliing in good ground are tilted by the upper surface of unstable stratum, then setting of casing, cementing completion；Step 2：A bite horizontal well is bored, horizontal well has vertical well section, angle buildup interval, upwarps well section and net horizontal section, and vertical well section is located at inclined shaft shaft bottom inclined direction side；Step 3：Fracturing sand control construction is carried out to net horizontal section, it is desirable that pressure-break extends into reservoir, injects chemical sand control agent to crack and reservoir；Step 4：Inclined shaft is closed using well head, horizontal well is opened, using CO2Displacement or heat injection or decompression or mixing method exploitation of gas hydrate.Invention enhances the stability of pit shaft, smoothness, improve the contact area of pit shaft and reservoir, the transformation of gas hydrates phase is set to be happened inside stable pit shaft, on the one hand can effectively avoid shake out, gas hydrates phase change uncontrollable and pit shaft it is unstable caused by the complicated even disaster of accident, on the other hand can effectively improve gas hydrates well yield and economic benefit.
Description
Technical field
The present invention relates to a kind of methods using F type well group exploitation of gas hydrate, belong to the brill of gas hydrates
Well and production technique field, and in particular to a kind of comprehensive utilization F type well groups, using voltage drop method, heating, CO2Displacement method is mixed
The method of legal exploitation of gas hydrate.
Background technology
Non- diagenesis gas hydrates are embedded in the non-diagenesis stratum in seabed more, and buried depth is shallow, and reservoir is unstable, and superstratum is also
It is unstable.Gas hydrates are in solid-state under the conditions of cryogenic high pressure, during gas hydrates drilling, due to system temperature
Pressure change is spent, phase changes.If phase transformation is uncontrollable, gas hydrates volume drastically expands, in addition
Stratum and pit shaft are unstable, easily cause formation collapse, or even induce the catastrophic failures such as geological disasters and tsunami such as seafloor slump.
Therefore, the disastrous risk of non-diagenesis exploitation of gas hydrates is that quotient adopts/big an obstacle of pilot production.In addition, production efficiency is low
It is also an important factor for influencing gas hydrates the economic exploitation.Stable wellbore conditions are artificially created, promote hydrate fast
Speed is controllably decomposed, and ensures that drilling is safe and efficient, is the main thought for developing gas hydrates.
Invention content
In order to solve the above technical problems, the present invention provides a kind of method using F type well group exploitation of gas hydrate,
It not only can guarantee the stabilization of entire well group pit shaft in this way, but also longer net horizontal section can be crept into, and increased the contact surface of pit shaft and reservoir
Product ensures the long-term high-efficiency mining of gas hydrates.
To achieve the above object, the present invention provides a kind of method using F type well group exploitation of gas hydrate, the party
The step of method, is as follows：
Step 1：A bite inclined shaft is bored, is tilted by the upper surface of unstable stratum and is drilled into gas hydrates reservoir and underlies in good ground
A target spots, then setting of casing, cementing completion；
Step 2：A bite horizontal well is bored, horizontal well has vertical well section, angle buildup interval, upwarps well section and net horizontal section, Vertical Well
Section is located at inclined shaft shaft bottom inclined direction side, and when horizontal well drilling, vertically gas hydrates are drilled by the upper surface of unstable stratum
The reservoir B target spots in good ground that underlie are vertical well section, and it is deflecting to be drilled into the C target spots in good ground by B target spot deflectings
Well section, upwarped by C target spots be drilled into be connected to inclined shaft after to be further continued for being drilled into D target spots in good ground be to upwarp well section, by D target spots
It is net horizontal section that level, which is drilled into the E target spots in good ground, then setting of casing, cementing completion；
Step 3：Fracturing sand control construction is carried out to net horizontal section, it is desirable that pressure-break extends into reservoir, is injected to crack and reservoir
Chemical sand control agent；
Step 4：Inclined shaft is closed using well head, horizontal well is opened, using CO2Displacement or heat injection or decompression or mixing method exploitation are natural
Gas hydrate.
Among the above, the hole angle in inclined shaft shaft bottom is between 5 °~25 °；Inclined shaft A target spots away from reservoir air line distance 20m~
150m。
Among the above, well section and connection of the inclined shaft at the above 10m ~ 130m of A target spots are upwarped.
Among the above, net horizontal section and gas hydrates reservoir air line distance are between 5m~130m.
In the present invention, which is mainly used to store water, sandstone, draining, sand washing, and note CO2, hot water etc., to protect
Demonstrate,prove the long-term high-efficiency mining of gas hydrates.
In the present invention, which is mainly used to ensure the stability of entire well group well bore, while the well is used for increasing
The contact area of pit shaft and reservoir.
In the present invention, exploit situation according to practical, when excessive water flooding or sandstone are collected in inclined shaft shaft bottom, in inclined shaft into
Row draining or sand washing operation.After operation, continue exploitation of gas hydrate.
In the present invention, common pressure break or staged fracturing are carried out to horizontal well horizontal segment, it is desirable that pressure-break extends into storage
Layer, chemical sand control agent is injected to crack and reservoir again after fracturing fluid recovery (backflow), in order to form artificial well around reservoir and pit shaft
Wall prevents the wellbore stability that shakes out and keep.
In the present invention, when exploitation of gas hydrate, inclined shaft is closed, horizontal wells natural gas is utilized.In inclined shaft
Note CO2, heat injection, and close horizontal well.
The beneficial effects of the present invention are：
Be made of a bite inclined shaft and a bite horizontal well, the target spot of inclined shaft, connectivity points, horizontal well inclination section, upwarp section and be respectively positioned on
In the good ground that underlies of non-diagenesis gas hydrates reservoir, the stabilization of entire well group pit shaft not only can guarantee in this way, but also can bore
Into longer net horizontal section, increase the contact area of pit shaft and reservoir, ensures the long-term high-efficiency mining of gas hydrates.
Horizontal well is in stable state with inclined shaft, can successfully manage borehole well instability caused by gas hydrates and ask
Topic, the generation of prevention and control accident complexity and disaster.
The contact area of pit shaft and reservoir is largely increased after fractured horizontal well sand control and prevents from shaking out, then is coordinated
The methods of heat injection, decompression, can effectively improve exploitation of gas hydrates efficiency.
Each performs its own functions for deviated well and horizontal well, and horizontal well is used for gas production, and inclined shaft is used for implementing the works such as heat injection, draining and sand washing
Skill simplifies operational procedure, is conducive to the long-term high-efficiency mining of gas hydrates.
Description of the drawings
Fig. 1 is the structural schematic diagram of the present invention.
Fig. 2 is the L portion enlarged drawing of Fig. 1.
Specific implementation mode
The present invention is clearly described with attached drawing with reference to embodiment.
Embodiment one
As shown in Figure 1 and Figure 2, the present embodiment is that 5 sections of pressure breaks of F types well group+chemistry artificial borehole wall+voltage drop method exploitation is non-at lithotype day
Right gas hydrate.The F type well groups include horizontal well 10 and inclined shaft 9, and entire well group is cased hole completion.
Subdrilling a bite inclined shaft 9 is drilled into gas hydrates reservoir 7 by the inclination of the upper surface of unstable stratum 6 and underlies steadily
A target spots in layer 8, then setting of casing, cementing completion；Wherein, the hole angle in 9 shaft bottom of inclined shaft is 10 °, the A target spots of inclined shaft 9 away from
7 air line distance 50m of gas hydrates reservoir；
A bite horizontal well 10 is bored again, and horizontal well 10 has vertical well section 1, angle buildup interval 2, upwarps well section 3 and net horizontal section 4, erects
Straight well section 1 is located at 1 shaft bottom inclined direction side of inclined shaft, when horizontal well drilling 10, is vertically drilled by the upper surface of unstable stratum 6 natural
The B target spots in good ground 8 that underlie of gas hydrate reservoir 7 are vertical well section 1, are drilled into good ground 8 by B target spot deflectings
C target spots be angle buildup interval 2, upwarped by C target spots be drilled into be connected to inclined shaft 9 after be further continued for the D target spots being drilled into good ground 8 be it is upper
Well section 3 is stuck up, it is net horizontal section 4 to be drilled into the E target spots in good ground 8 by D target spot levels, then setting of casing, cementing completion；Its
In, upwarp well section 2 and connection of the inclined shaft 9 at the above 130m of A target spots, net horizontal section 5 and 7 straight line of gas hydrates reservoir away from
From for 5m；
Fracturing sand control construction is carried out to net horizontal section, to net horizontal section perforation and extrudes 5 cracks, it is desirable that pressure-break extends into
Then reservoir injects chemical sand control agent into crack and reservoir, form artificial borehole wall and anti-layer of sand 5, so as to sand control and keeps well
Wall is stablized；
Inclined shaft 9 is closed using well head, horizontal well 10 is opened, using voltage drop method exploitation of gas hydrate.
After producing a period of time, inclined shaft 9 will collect a large amount of water floodings and formation sand.When water flooding and formation sand influence naturally
When gas yield, horizontal well 10 is closed, opens inclined shaft 9, foaming water discharge measure or sand washing operation are used in inclined shaft 9.Draining or punching
After sand operation, horizontal well 10 is opened, closes inclined shaft 9, continues gas production operation.Embodiment two
As shown in Figure 1 and Figure 2, the present embodiment is 11 sections of fracturing sand controls of F types well group+decompression+CO2Displacement method exploitation is non-at lithotype day
Right gas hydrate.The F type well groups include horizontal well 10 and inclined shaft 9, and entire well group is cased hole completion.
Subdrilling a bite inclined shaft 9 is drilled into gas hydrates reservoir 7 by the inclination of the upper surface of unstable stratum 6 and underlies steadily
A target spots in layer 8, then setting of casing, cementing completion；Wherein, the hole angle in 9 shaft bottom of inclined shaft is 15 °, the A target spots of inclined shaft 9 away from
7 air line distance 80m of gas hydrates reservoir；
A bite horizontal well 10 is bored again, and horizontal well 10 has vertical well section 1, angle buildup interval 2, upwarps well section 3 and net horizontal section 4, erects
Straight well section 1 is located at 1 shaft bottom inclined direction side of inclined shaft, when horizontal well drilling 10, is vertically drilled by the upper surface of unstable stratum 6 natural
The B target spots in good ground 8 that underlie of gas hydrate reservoir 7 are vertical well section 1, are drilled into good ground 8 by B target spot deflectings
C target spots be angle buildup interval 2, upwarped by C target spots be drilled into be connected to inclined shaft 9 after be further continued for the D target spots being drilled into good ground 8 be it is upper
Well section 3 is stuck up, it is net horizontal section 4 to be drilled into the E target spots in good ground 8 by D target spot levels, then setting of casing, cementing completion；Its
In, upwarp well section 2 and connection of the inclined shaft 9 at the above 20m of A target spots, net horizontal section 5 and 7 straight line of gas hydrates reservoir away from
From for 10m；
Fracturing sand control construction is carried out to net horizontal section, to net horizontal section perforation and extrudes 11 cracks, it is desirable that pressure-break extends into
Enter reservoir, chemical sand control agent is then injected into crack and reservoir, artificial borehole wall and anti-layer of sand 5 is formed, so as to sand control and holding
Wellbore stability；
Inclined shaft 9 is closed using well head, horizontal well 10 is opened, using voltage drop method exploitation of gas hydrate.
After producing a period of time, there is deficit in reservoir, and gas hydrate dissociation slows.At this point, closing horizontal well
10, inclined shaft 9 is opened, CO is injected in inclined shaft2.After a period of time, inclined shaft 9 is turned off, horizontal well 10 is opened, continues with decompression
Method taps natural gas.So cycle.Later, inclined shaft 9 will collect a large amount of water floodings and formation sand.When water flooding and formation sand influence
When gas production, horizontal well 10 is closed, opens inclined shaft 9, foaming water discharge measure or sand washing operation are used in inclined shaft 9.Draining
Or after sand washing operation, horizontal well 10 is opened, closes inclined shaft 9, continues gas production operation.
Claims (4)
1. a kind of exploiting the non-method at lithotype gas hydrates using F type well groups, which is characterized in that the step of this method such as
Under：
Step 1：A bite inclined shaft is bored, is tilted by the upper surface of unstable stratum and is drilled into gas hydrates reservoir and underlies in good ground
A target spots, then setting of casing, cementing completion；
Step 2：A bite horizontal well is bored, horizontal well has vertical well section, angle buildup interval, upwarps well section and net horizontal section, Vertical Well
Section is located at inclined shaft shaft bottom inclined direction side, and when horizontal well drilling, vertically gas hydrates are drilled by the upper surface of unstable stratum
The reservoir B target spots in good ground that underlie are vertical well section, and it is deflecting to be drilled into the C target spots in good ground by B target spot deflectings
Well section, upwarped by C target spots be drilled into be connected to inclined shaft after to be further continued for being drilled into D target spots in good ground be to upwarp well section, by D target spots
It is net horizontal section that level, which is drilled into the E target spots in good ground, then setting of casing, cementing completion；
Step 3：Fracturing sand control construction is carried out to net horizontal section, it is desirable that pressure-break extends into reservoir, is injected to crack and reservoir
Chemical sand control agent；
Step 4：Inclined shaft is closed using well head, horizontal well is opened, using CO2Displacement or heat injection or decompression or mixing method exploitation are natural
Gas hydrate.
2. a kind of as described in claim 1 exploit the non-method at lithotype gas hydrates using F type well groups, feature exists
In the hole angle in inclined shaft shaft bottom is between 5 °~25 °；Inclined shaft A target spots are away from reservoir air line distance 20m~150m.
3. a kind of as described in claim 1 exploit the non-method at lithotype gas hydrates using F type well groups, feature exists
In upwarping well section and connection of the inclined shaft at the above 10m ~ 130m of A target spots.
4. a kind of as claimed in claim 2 exploit the non-method at lithotype gas hydrates using F type well groups, feature exists
In net horizontal section and gas hydrates reservoir air line distance are between 5m~130m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810313659.0A CN108590595B (en) | 2018-04-10 | 2018-04-10 | Method for exploiting non-diagenetic natural gas hydrate by utilizing F-shaped well group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810313659.0A CN108590595B (en) | 2018-04-10 | 2018-04-10 | Method for exploiting non-diagenetic natural gas hydrate by utilizing F-shaped well group |
Publications (2)
| Publication Number | Publication Date |
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| CN108590595A true CN108590595A (en) | 2018-09-28 |
| CN108590595B CN108590595B (en) | 2020-04-21 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109653713A (en) * | 2018-12-20 | 2019-04-19 | 成都理工大学 | A kind of gas hydrates song well drilling device |
| CN111173480A (en) * | 2018-11-12 | 2020-05-19 | 中国石油化工股份有限公司 | Natural gas hydrate exploitation method |
| CN111550222A (en) * | 2019-02-11 | 2020-08-18 | 中国石油天然气股份有限公司 | Method for exploiting natural gas hydrate by injecting steam |
| CN112761570A (en) * | 2019-11-04 | 2021-05-07 | 中国石油化工股份有限公司 | Natural gas upwarping horizontal well completion method |
| CN114382444A (en) * | 2021-12-17 | 2022-04-22 | 中国石油大学(华东) | Combined CO2Gas-buried natural gas hydrate exploitation system and method |
| CN115217445A (en) * | 2021-04-16 | 2022-10-21 | 中国石油化工股份有限公司 | Device and method for exploiting natural gas hydrate in U-shaped well |
| CN115306366A (en) * | 2022-09-13 | 2022-11-08 | 中国石油大学(华东) | Efficient yield-increasing exploitation method for natural gas hydrate |
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| CN111550222A (en) * | 2019-02-11 | 2020-08-18 | 中国石油天然气股份有限公司 | Method for exploiting natural gas hydrate by injecting steam |
| CN111550222B (en) * | 2019-02-11 | 2022-07-05 | 中国石油天然气股份有限公司 | Method for exploiting natural gas hydrate by injecting steam |
| CN112761570A (en) * | 2019-11-04 | 2021-05-07 | 中国石油化工股份有限公司 | Natural gas upwarping horizontal well completion method |
| CN115217445A (en) * | 2021-04-16 | 2022-10-21 | 中国石油化工股份有限公司 | Device and method for exploiting natural gas hydrate in U-shaped well |
| CN115217445B (en) * | 2021-04-16 | 2024-05-14 | 中国石油化工股份有限公司 | Device and method for exploiting natural gas hydrate by U-shaped well |
| CN114382444A (en) * | 2021-12-17 | 2022-04-22 | 中国石油大学(华东) | Combined CO2Gas-buried natural gas hydrate exploitation system and method |
| CN114382444B (en) * | 2021-12-17 | 2023-10-13 | 中国石油大学(华东) | Combined CO 2 Gas buried natural gas hydrate exploitation system and method |
| CN115306366A (en) * | 2022-09-13 | 2022-11-08 | 中国石油大学(华东) | Efficient yield-increasing exploitation method for natural gas hydrate |
| US11952869B1 (en) | 2022-09-13 | 2024-04-09 | China University Of Petroleum (East China) | High-efficiency yield-increasing exploitation method for natural gas hydrates |
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