CN105909223A - Method for electric heating assisted depressurizing production of natural gas hydrate reservoir through dual horizontal shafts - Google Patents
Method for electric heating assisted depressurizing production of natural gas hydrate reservoir through dual horizontal shafts Download PDFInfo
- Publication number
- CN105909223A CN105909223A CN201610286797.5A CN201610286797A CN105909223A CN 105909223 A CN105909223 A CN 105909223A CN 201610286797 A CN201610286797 A CN 201610286797A CN 105909223 A CN105909223 A CN 105909223A
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- Prior art keywords
- exploitation
- horizontal well
- gas
- gas hydrate
- electrical heating
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Links
- 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 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 230000009977 dual effect Effects 0.000 title claims abstract description 17
- 238000005485 electric heating Methods 0.000 title abstract 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000005065 mining Methods 0.000 claims abstract 4
- 239000007789 gas Substances 0.000 claims description 52
- 238000010438 heat treatment Methods 0.000 claims description 31
- 150000004677 hydrates Chemical class 0.000 claims description 30
- 230000036772 blood pressure Effects 0.000 claims description 26
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 4
- 239000003345 natural gas Substances 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000010494 dissociation reaction Methods 0.000 claims description 3
- 230000005593 dissociations Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims description 3
- 230000036571 hydration Effects 0.000 claims description 2
- 238000006703 hydration reaction Methods 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims 1
- 238000000354 decomposition reaction Methods 0.000 abstract 1
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 210000003296 saliva Anatomy 0.000 description 1
- 238000003786 synthesis reaction 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2401—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection by means of electricity
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
- Media Introduction/Drainage Providing Device (AREA)
Abstract
The invention discloses a method for electric heating assisted depressurizing production of a natural gas hydrate reservoir through dual horizontal shafts. Electrodes are installed on the upper horizontal shaft and the lower horizontal shaft correspondingly, the natural gas hydrate reservoir serves as a resistor, electric energy is directly converted into heat energy for mining natural gas hydrate, and electric heating mining is carried out on the natural gas hydrate reservoir accordingly. Specifically, the method includes the steps that the electrodes are installed at the horizontal section of the upper horizontal shaft and the horizontal section of the lower horizontal shaft correspondingly, and the electrodes are connected with a ground control cabinet through cables; the upper horizontal shaft and the lower horizontal shaft form a current loop through water obtained through decomposition of the natural gas hydrate in the depressurizing production stage, the natural gas hydrate reservoir serves as the resistor, electric energy is converted into heat energy, and accordingly electric heating mining of the natural gas hydrate reservoir is achieved. The method is simple in structure, capable of saving energy, environmentally friendly and easy to control, and provides an effective measure for development of the natural gas hydrate reservoir.
Description
Technical field:
A kind of method that the present invention relates to gas hydrates development field, particularly a kind of dual horizontal well electrical heating secondary buck taps natural gas hydration
The method that thing is hidden.
Background technology:
Gas hydrates are to compose the one combustible ice-like crystalline material being stored in seabed and stratum, land permafrost area, little by water and methane etc.
Molecular gas is formed under the conditions of cryogenic high pressure, and its distribution is wide, and energy density is high, is the following potential high-efficiency cleaning energy.
The most conventional blood pressure lowering extraction system, inhibitor injection method and heat injection method exploitation of gas hydrate.Wherein voltage drop method development rate is slow, development effectiveness
Difference, the scope of application is narrower；Inhibitor injection method mainly injects the chemical agent such as methanol and synthesis polyamine group in stratum, and the method cost is high and easily causes
Stratum and the destruction of environment, application is more limited to；Heat injection method needs to utilize special equipment to inject steam or hot water in stratum, and development cost is high,
And easily cause reservoir destruction.Utilize dual horizontal well electrical heating exploitation of gas hydrate, the heat of exploitation gas hydrates can be converted electrical energy into
Can, its development rate is fast, and capacity usage ratio is high, receives more and more attention, but does not still have a kind of dual horizontal well electrical heating secondary buck to open at present
The method adopting gas hydrates, seriously constrains the progress of gas hydrates exploitation.
Summary of the invention:
Present invention is primarily targeted at a kind of method providing dual horizontal well electrical heating secondary buck exploitation of gas hydrate to hide, the method can be big
Width improves the recovery ratio of gas hydrates.
The purpose of the present invention is mainly realized by the following method: the horizontal segment at upper and lower horizontal well installs electrode, and electrode is respectively by cable and control
Cabinet is connected, and using the gas hydrates of blood pressure lowering exploitation decomposed as resistance, directly converts electrical energy into the heat energy that heating hydrate is hidden, it is achieved that
Dual horizontal well electrical heating secondary buck exploitation of gas hydrate is hidden, and comprises the steps:
(1) it is more than the gas hydrates of 20m according to the geologic information of gas hydrates, preferably average effective caliper, drills through upper and lower
Two mouthfuls of water horizontal wells, horizontal section length is 300～500m, uses insulated sleeve completion；For suggestions for improvement, improve development efficiency, upper and lower
Two mouthfuls of water horizontal wells all connect gas hydrates by well-case perforating；Horizontal well inner oil tube is insulation oil pipe, and the oil jacket annular space of peupendicular hole section is at heel
All utilizing packer to insulate, oil pipe is connected with gas-liquid separator, and water that gas hydrate dissociation produces is gentle to be carried out point by gas-liquid separator
From process；
(2) installing ground control cabinet, ground control cabinet is made up of power supply, electric adjustment equipment and electric brake, and wherein power supply is used for providing gas water
Compound hides the electric energy needed for exploitation, and the supply voltage used is 480V, and current frequency range is 50～60Hz, and electric adjustment equipment is used for controlling
Electrical output power is 100～120kW, installs electric brake and carry out connecting control between power supply with electric adjustment equipment；
(3) horizontal segment of horizontal well and lower horizontal well uniformly installs 10～20 electrodes up, for strengthening electrical heating effect, upper horizontal well
The electrode of electrode and described lower horizontal well use staggered mode, electrode is connected with described ground control cabinet by cable；
(4) according to the geological conditions of gas hydrates, the pressure parameter that horizontal well blood pressure lowering exploitation of gas hydrate is hidden and electrical heating exploitation
The critical parameters of gas hydrates are designed, and when exploiting including blood pressure lowering, Horizontal Well bottom pressure is 1.5～4.5MPa, critical day during blood pressure lowering exploitation
Gas production is 1000m3/ d～2000m3/ d, the critical day gas production of electrical heating exploitation is 2500m3/ d～3500m3/d；
(5) pressure parameter hidden according to described horizontal well blood pressure lowering exploitation of gas hydrate, uses described two mouthfuls of water horizontal wells to gas hydrates
Tibetan carries out blood pressure lowering exploitation, when two mouthfuls water horizontal well day gas production be below blood pressure lowering exploitation critical day gas production time, blood pressure lowering exploitation terminate；
(6) electric brake in described ground control cabinet is closed, proceed by electrical heating exploitation of gas hydrate and hide, when two mouthfuls of water horizontal well day gas production
When amount is below the critical day gas production of electrical heating exploitation, described electric brake is disconnected, stop exploitation.
First the present invention carries out blood pressure lowering exploitation to gas hydrates, makes gas hydrates decomposed, is reduced to critical daily output in daily output tolerance
After tolerance, gas hydrates being electrically heated auxiliary exploitation, capacity usage ratio is high, simple in construction, it is easy to control, and is hydrated for natural gas
The exploitation that thing is hidden provides effective ways.
Accompanying drawing illustrates:
Fig. 1 is the schematic diagram that dual horizontal well electrical heating secondary buck exploitation of gas hydrate is hidden.
Wherein, 1, ground control cabinet；2, cable；3, cable；4, gas-liquid separator；5, insulated sleeve；6, packer；7, electrode；8、
Perforation；9, natural gas pool；10, insulation oil pipe；11, electric adjustment equipment；12, power supply；13, electric brake；14, threeway；15 electrodes.
Detailed description of the invention:
Describe the present invention in detail below in conjunction with accompanying drawing, but do not limit the practical range of the present invention.
(1) it is the gas hydrates of 40m according to the geologic information of gas hydrates, preferably average effective caliper, drills through upper and lower two
Saliva horizontal well, horizontal section length is 500m, uses insulated sleeve 5 completion；For suggestions for improvement, improve development efficiency, upper and lower two mouthfuls
Horizontal well all passes through well-case perforating 8 and connects gas hydrates；Horizontal well inner oil tube is insulation oil pipe 10, and the oil jacket annular space of peupendicular hole section all utilizes
Packer 6 insulates, and oil pipe 10 is connected with gas-liquid separator 4, and the water of gas hydrate dissociation generation is gentle to be entered by gas-liquid separator 4
Row separating treatment；
(2) installing ground control cabinet 1, ground control cabinet 1 is made up of power supply 12, electric adjustment equipment 11 and electric brake 13, and wherein power supply 12 is used
Thering is provided the electric energy needed for gas hydrates exploitation, the supply voltage used is 480V, and current frequency range is 60Hz, utilizes electric power to adjust
It is 100kW that joint equipment 11 controls electrical output power, installs electric brake 13 and carry out connecting control between power supply with electric adjustment equipment；
(3) net horizontal section of horizontal well uniformly installs 10 electrodes 7 up, and the net horizontal section of lower horizontal well uniformly installs 10 electrodes 15,
For strengthening electrical heating effect, the electrode 7 of upper horizontal well uses staggered mode, electrode 7 and electricity with the electrode 15 of described lower horizontal well
Pole 15 is connected with described ground control cabinet 1 with cable 2 by cable 3 respectively；
(4) according to the geological conditions of gas hydrates, the pressure parameter that horizontal well blood pressure lowering exploitation of gas hydrate is hidden and electrical heating exploitation
The critical parameters of gas hydrates are designed, and when exploiting including blood pressure lowering, Horizontal Well bottom pressure is 4MPa, critical day gas production during blood pressure lowering exploitation
Amount is 1000m3/ d, the critical day gas production of electrical heating exploitation is 3000m3/d；
(5) pressure parameter hidden according to described horizontal well blood pressure lowering exploitation of gas hydrate, uses described two mouthfuls of water horizontal wells to gas hydrates
Tibetan carries out blood pressure lowering exploitation, when two mouthfuls water horizontal well day gas production be below 1000m3During/d, blood pressure lowering exploitation terminates；
(6) electric brake 13 in described ground control cabinet 1 is closed, proceed by electrical heating exploitation of gas hydrate and hide, when two mouthfuls of water horizontal well days
Gas production is below 3000m3During/d, described electric brake is disconnected, stop exploitation.
Claims (8)
1. the method that a dual horizontal well electrical heating secondary buck exploitation of gas hydrate is hidden, it is characterised in that horizontal well and lower horizontal well up
Horizontal segment be respectively mounted electrode, electrode is connected with ground control cabinet by cable respectively, and upper and lower horizontal well is by blood pressure lowering mining phase gas water
Compound decomposes the water obtained and forms current loop, using gas hydrates as resistance, converts electrical energy into heat energy, thus realizes natural gas hydration
The electrical heating exploitation that thing is hidden, comprises the steps:
(1) it is more than the gas hydrates of 20m according to the geologic information of gas hydrates, preferably average effective caliper, drills through upper and lower
Two mouthfuls of water horizontal wells, two mouthfuls of water horizontal wells use cased hole completion, and connect gas hydrates by well-case perforating；
(2) installing ground control cabinet, ground control cabinet is made up of power supply, electric adjustment equipment and electric brake, and wherein power supply is used for providing gas water
Compound hides the electric energy needed for exploitation, and electric adjustment equipment is used for controlling electrical output power, installs electric brake and carry out between power supply and electric adjustment equipment
Connection controls；
(3) net horizontal section of horizontal well and lower horizontal well the most uniformly installs 10～20 electrodes up, and electrode is by cable and described ground
Switch board is connected；
(4) according to the geological conditions of gas hydrates, the pressure parameter that horizontal well blood pressure lowering exploitation of gas hydrate is hidden and electrical heating exploitation
The critical parameters of gas hydrates are designed, Horizontal Well bottom pressure when exploiting including blood pressure lowering, blood pressure lowering exploitation time critical day gas production with
And critical day gas production during electrical heating exploitation；
(5) pressure parameter hidden according to described horizontal well blood pressure lowering exploitation of gas hydrate, uses described two mouthfuls of water horizontal wells to gas hydrates
Tibetan carries out blood pressure lowering exploitation, when two mouthfuls water horizontal well day gas production be below blood pressure lowering exploitation critical day gas production time, blood pressure lowering exploitation terminate；
(6) electric brake in described ground control cabinet is closed, proceed by electrical heating exploitation of gas hydrate and hide, when two mouthfuls of water horizontal well day gas production
When amount is below the critical day gas production of electrical heating exploitation, described electric brake is disconnected, stop exploitation.
The method that a kind of dual horizontal well electrical heating secondary buck exploitation of gas hydrate the most according to claim 1 is hidden, it is characterised in that institute
Stating horizontal well design between 300m～500m, sleeve pipe is insulated sleeve, and horizontal well inner oil tube is insulation oil pipe.
The method that a kind of dual horizontal well electrical heating secondary buck exploitation of gas hydrate the most according to claim 1 is hidden, it is characterised in that for
Suggestions for improvement, improves production efficiency, and the horizontal segment of upper and lower two mouthfuls of water horizontal wells all carries out perforation completion.
The method that a kind of dual horizontal well electrical heating secondary buck exploitation of gas hydrate the most according to claim 1 is hidden, it is characterised in that institute
Stating horizontal well inner oil tube to be connected with gas-liquid separator, the water of gas hydrate dissociation generation is gentle carries out separating treatment by gas-liquid separator.
The method that a kind of dual horizontal well electrical heating secondary buck exploitation of gas hydrate the most according to claim 1 is hidden, it is characterised in that for
Strengthening electrically heated effect, the electrode of described upper horizontal well uses staggered mode with the electrode of described lower horizontal well.
The method that a kind of dual horizontal well electrical heating secondary buck exploitation of gas hydrate the most according to claim 1 is hidden, it is characterised in that institute
The heel stating upper horizontal well and lower horizontal well peupendicular hole section all utilizes packer packing oil removal to overlap annular space.
The method that a kind of dual horizontal well electrical heating secondary buck exploitation of gas hydrate the most according to claim 1 is hidden, it is characterised in that institute
The supply voltage used is 480V, and current frequency range is 50～60Hz, and output power range is 100～120kW.
The method that a kind of dual horizontal well electrical heating secondary buck exploitation of gas hydrate the most according to claim 1 is hidden, it is characterised in that institute
Horizontal Well bottom pressure scope when stating blood pressure lowering exploitation is 1.5～4.5MPa, and critical day gas production during described blood pressure lowering exploitation is 1000m3/ d～2000
m3/ d, critical day gas production during described electrical heating exploitation is 2500m3/ d～3500m3/d。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610286797.5A CN105909223A (en) | 2016-05-03 | 2016-05-03 | Method for electric heating assisted depressurizing production of natural gas hydrate reservoir through dual horizontal shafts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610286797.5A CN105909223A (en) | 2016-05-03 | 2016-05-03 | Method for electric heating assisted depressurizing production of natural gas hydrate reservoir through dual horizontal shafts |
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| CN105909223A true CN105909223A (en) | 2016-08-31 |
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|---|---|---|---|
| CN201610286797.5A Pending CN105909223A (en) | 2016-05-03 | 2016-05-03 | Method for electric heating assisted depressurizing production of natural gas hydrate reservoir through dual horizontal shafts |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106337675A (en) * | 2016-11-21 | 2017-01-18 | 重庆科技学院 | Formation electric eddy current heating thick oil recovery system and the mining method |
| CN106640005A (en) * | 2016-12-20 | 2017-05-10 | 中国石油天然气股份有限公司 | Downhole electric heating horizontal well pipe column structure and oil layer heating method thereof |
| CN107083943A (en) * | 2017-06-01 | 2017-08-22 | 中国石油大学(华东) | A kind of hot CO of segment level well2The method that the heterogeneous hydrate of exploitation of handling up is hidden |
| CN107143313A (en) * | 2017-07-14 | 2017-09-08 | 中国石油大学(华东) | A kind of water filling exploitation of geothermal energy and hydrate are hidden simultaneously well construction design and method |
| CN107676060A (en) * | 2017-10-23 | 2018-02-09 | 大庆东油睿佳石油科技有限公司 | A kind of method of the U-shaped well microwave heating exploitation of gas hydrates |
| CN108005626A (en) * | 2017-11-27 | 2018-05-08 | 华南理工大学 | A kind of gas hydrate exploitation device and method based on hot pipe technique |
| CN110273663A (en) * | 2019-06-18 | 2019-09-24 | 李宏丽 | Well head bridge-type reheating technique |
| CN110344801A (en) * | 2018-04-03 | 2019-10-18 | 齐鲁工业大学 | Fracturing work method, recovery method and mining system for combustible ice exploitation |
| CN110821448A (en) * | 2019-11-14 | 2020-02-21 | 中国科学院广州能源研究所 | Exploitation method and exploitation device for marine natural gas hydrate |
| CN111720100A (en) * | 2020-06-29 | 2020-09-29 | 陕西工业职业技术学院 | Unconventional natural gas combined mining method for frozen soil area |
| CN111734358A (en) * | 2020-06-29 | 2020-10-02 | 陕西工业职业技术学院 | Comprehensive exploitation method for combustible ice in frozen soil area |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106337675A (en) * | 2016-11-21 | 2017-01-18 | 重庆科技学院 | Formation electric eddy current heating thick oil recovery system and the mining method |
| CN106640005B (en) * | 2016-12-20 | 2019-07-09 | 中国石油天然气股份有限公司 | Downhole electric heating horizontal well pipe column structure and oil layer heating method thereof |
| CN106640005A (en) * | 2016-12-20 | 2017-05-10 | 中国石油天然气股份有限公司 | Downhole electric heating horizontal well pipe column structure and oil layer heating method thereof |
| CN107083943A (en) * | 2017-06-01 | 2017-08-22 | 中国石油大学(华东) | A kind of hot CO of segment level well2The method that the heterogeneous hydrate of exploitation of handling up is hidden |
| CN107083943B (en) * | 2017-06-01 | 2019-10-18 | 中国石油大学(华东) | A kind of hot CO of segment level well2It handles up and exploits the method that heterogeneous hydrate is hidden |
| CN107143313A (en) * | 2017-07-14 | 2017-09-08 | 中国石油大学(华东) | A kind of water filling exploitation of geothermal energy and hydrate are hidden simultaneously well construction design and method |
| CN107143313B (en) * | 2017-07-14 | 2018-11-16 | 中国石油大学(华东) | A kind of water filling exploitation of geothermal energy and hydrate are hidden simultaneously well construction design and method |
| CN107676060A (en) * | 2017-10-23 | 2018-02-09 | 大庆东油睿佳石油科技有限公司 | A kind of method of the U-shaped well microwave heating exploitation of gas hydrates |
| CN108005626A (en) * | 2017-11-27 | 2018-05-08 | 华南理工大学 | A kind of gas hydrate exploitation device and method based on hot pipe technique |
| CN110344801A (en) * | 2018-04-03 | 2019-10-18 | 齐鲁工业大学 | Fracturing work method, recovery method and mining system for combustible ice exploitation |
| CN110273663A (en) * | 2019-06-18 | 2019-09-24 | 李宏丽 | Well head bridge-type reheating technique |
| CN110821448A (en) * | 2019-11-14 | 2020-02-21 | 中国科学院广州能源研究所 | Exploitation method and exploitation device for marine natural gas hydrate |
| CN110821448B (en) * | 2019-11-14 | 2022-02-18 | 中国科学院广州能源研究所 | Exploitation method and exploitation device for marine natural gas hydrate |
| CN111720100A (en) * | 2020-06-29 | 2020-09-29 | 陕西工业职业技术学院 | Unconventional natural gas combined mining method for frozen soil area |
| CN111734358A (en) * | 2020-06-29 | 2020-10-02 | 陕西工业职业技术学院 | Comprehensive exploitation method for combustible ice in frozen soil area |
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Inventor after: Hou Jian Inventor after: Wang Yuanyin Inventor after: Liu Yongge Inventor after: Yu Bo Inventor after: Du Qingjun Inventor after: Wang Yudou Inventor after: Lu Nu Inventor after: Xia Zhizeng Inventor after: Liu Jingyao Inventor before: Hou Jian Inventor before: Liu Yongge Inventor before: Yu Bo Inventor before: Wang Yuanyin Inventor before: Du Qingjun Inventor before: Wang Yudou Inventor before: Lu Nu Inventor before: Xia Zhizeng Inventor before: Liu Jingyao |
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Application publication date: 20160831 |