CN110685655A - Natural gas hydrate exploitation method for heating stratum by electric pulse - Google Patents
Natural gas hydrate exploitation method for heating stratum by electric pulse Download PDFInfo
- Publication number
- CN110685655A CN110685655A CN201911095694.0A CN201911095694A CN110685655A CN 110685655 A CN110685655 A CN 110685655A CN 201911095694 A CN201911095694 A CN 201911095694A CN 110685655 A CN110685655 A CN 110685655A
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- Prior art keywords
- electrodes
- hydrate
- stratum
- hydrate reservoir
- natural gas
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Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000010438 heat treatment Methods 0.000 title claims abstract description 18
- 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 18
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 238000005065 mining Methods 0.000 claims abstract description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Natural products C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 9
- 239000003345 natural gas Substances 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- -1 natural gas hydrates Chemical class 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 239000013535 sea water Substances 0.000 claims description 2
- 238000000354 decomposition reaction Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 230000035939 shock Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000008398 formation water Substances 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010793 Steam injection (oil industry) Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 230000009466 transformation Effects 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
-
- 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
- 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
- E21B43/2405—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection in association with fracturing or crevice forming processes
-
- 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
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)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a natural gas hydrate exploitation method for heating a stratum by electric pulses, which mainly comprises the following steps: 1. laying electrodes in the mining well and connecting the electrodes to the ground surface; 2. electrodes are inserted into the hydrate reservoir at equal intervals among the production wells and are connected to the ground surface in a wired mode; 3. respectively connecting the two adjacent electrodes to the positive electrode and the negative electrode of the high-voltage pulse discharge equipment, and discharging and heating the hydrate reservoir; 4. through pulse discharge operation, the hydrate reservoir is suitable for exploitation. The invention can improve the energy efficiency of exploiting the natural gas hydrate.
Description
Technical Field
The invention belongs to the field of natural gas hydrate research, and particularly relates to a natural gas hydrate exploitation method for an electric pulse heating stratum, which is suitable for exploitation of natural gas hydrates in permafrost and ocean areas.
Background
The natural gas hydrate is regarded as a substitute energy source in the future and has received wide attention due to the advantages of huge reserves, high efficiency, cleanness and the like. How to realize economic, efficient and safe exploitation of natural gas hydrates in reservoirs becomes the main content of natural gas hydrate research. Because the natural gas hydrate can exist stably under certain temperature and pressure conditions, the hydrate in the reservoir can be exploited by increasing the temperature of the reservoir or reducing the pressure of the reservoir. Based on the principle, the existing natural gas hydrate exploitation methods are mainly divided into a depressurization method and a thermal shock method.
The depressurization method is an economic exploitation method by extracting reservoir fluid to depressurize the reservoir and breaking the phase balance of the natural gas hydrate to realize exploitation, and because the method does not need to inject other energy and substances except for consuming part of external energy for extracting the formation fluid. However, since the hydrate decomposition is an endothermic process, a large amount of reservoir heat is consumed during the hydrate decomposition and production process due to depressurization, resulting in a decrease in reservoir temperature, and the hydrate decomposition cannot be continuously maintained. Meanwhile, secondary hydrate is generated in the stratum, and when the temperature of the reservoir is reduced to be below 0 ℃, reservoir water is frozen to block a fluid channel, so that the natural gas hydrate cannot be continuously extracted by a depressurization method.
The heat shock method is considered to be an effective technical means for solving the problem that the formation energy in the depressurization method cannot maintain the continuous decomposition of the hydrate. At present, a thermal shock method mainly comprises the steps of inputting high-temperature steam into a reservoir, inputting high-temperature hot water into the reservoir, inputting high-temperature brine into the reservoir, oxidizing and heating in-situ methane, electrically heating in situ and the like, but because a pipeline for conveying heat from the ground to the reservoir is long in distance and the formation permeability and the heat conductivity coefficient are low, the existing thermal shock method has the defects of high heat loss, low effective heat utilization and low energy efficiency (energy efficiency for short, which means the ratio of the heat value of extracted natural gas to the injected heat). Therefore, there is a need for an efficient formation heating method that solves many of the problems of the current thermal stimulation methods.
In the present application, the natural gas hydrate is referred to as hydrate for short.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a natural gas hydrate exploitation method for heating a stratum by electric pulses, which can improve the energy efficiency of natural gas hydrate exploitation.
The technical problem to be solved by the invention is realized by the technical scheme, which comprises the following steps:
1. laying a production well on the hydrate reservoir according to a conventional mode;
2. arranging electrodes in a mining well, connecting the electrodes to the ground surface, and filling seawater below the top surface of a hydrate reservoir stratum in the mining well to realize the coupling of the electrodes and the hydrate reservoir stratum;
3. inserting electrodes and temperature probes into the hydrate reservoir stratum at equal intervals between two adjacent production wells in a pipe ramming mode, wherein the electrodes are arranged in a straight line and connected to the ground surface in parallel;
4. respectively connecting the two adjacent electrodes to the positive electrode and the negative electrode of the high-voltage pulse discharge equipment; after the high-voltage pulse discharging equipment is charged by adopting a ground power supply, a discharging switch is turned on, and the high-voltage pulse electric energy realizes discharging and heating on a hydrate reservoir through two adjacent electrodes;
5. determining the temperature rise of the single discharge stratum according to the stratum temperature change condition tested by the probe, calculating the heat required by the decomposition of the hydrate according to the saturation of the hydrate of the stratum, and determining the frequency of pulse discharge operation until the hydrate reservoir is suitable for mining;
the number of times of reservoir discharge = heat required for complete hydrate decomposition/heat generated by a single discharge formation under the condition of corresponding hydrate saturation, and the formation temperature rise can just maintain complete hydrate decomposition, namely the production requirement of the hydrate reservoir is met.
6. And (5) sequentially connecting the electrodes arranged between the two adjacent production wells with high-voltage pulse discharge equipment, and repeating the step (4) and the step (5) to uniformly heat the hydrate reservoir between the two adjacent production wells.
Preferably, the production wells are arranged at a pitch of 500m and the electrodes between the production wells are spaced at a pitch of 50 m.
The working principle of the invention is as follows:
according to the records of the literature "research and application of high-voltage electric pulse oil layer treatment technology", poplars et al.. oil drilling and production process, 1998,20(5), 64-67 and the literature "pulse discharge technology for dredging oil-water wells", korea et al.. well logging technology, 1998,22 (2), 123-: the high-voltage pulse discharge is widely applied to the yield-increasing transformation construction of oil and gas wells, and achieves remarkable effect. However, in the application of high-voltage electric pulse, the action of high-intensity pulse shock waves generated by high-voltage pulse discharge is mainly utilized, and the thermal effect generated by the high-voltage pulse discharge is not used. Because the hydrate reservoir, especially the marine hydrate reservoir, is generally filled with formation water with higher salt concentration, when high-voltage pulse is introduced into the formation through the electrode, the high-salt concentration formation water has good conductivity, so that long-distance high-voltage pulse discharge can be realized, and the instantaneous large current of the high-voltage pulse discharge can generate shock wave effect and thermal effect in the hydrate reservoir. The shock wave effect can enable the hydrate reservoir to generate micro cracks, improve the permeability of the hydrate reservoir and facilitate the decomposition of the hydrate to generate methane and discharge water; the heat effect can directly heat the hydrate reservoir at high speed to provide heat for the decomposition of the formation hydrate.
The invention has the technical effects that:
the electric pulse is used for heating the stratum to recover the natural gas hydrate, so that the high-efficiency and rapid heating of the hydrate reservoir can be realized, and the process that the heating method in the prior art needs to slowly transfer heat from the shaft to the stratum is overcome; the method of the invention does not need to inject extra substances into the stratum, thereby overcoming the defect that the prior heating method of steam injection and hot water injection is difficult to permeate into a hydrate reservoir because of low stratum permeability. Meanwhile, the method realizes heating and infiltration enhancement of the hydrate reservoir by directly electrifying the electrodes of the hydrate reservoir, and avoids the problems of heat loss and the like caused by overlong pipelines from the ground to the reservoir when steam or hot water is injected. In addition, in the invention, the electrodes are arranged between the mines without drilling, and the rammed pipes are directly inserted, so that the electrode arrangement cost is reduced, and the good coupling between the electrodes and the hydrate reservoir stratum can be ensured. The invention can effectively realize the high-efficiency heating and permeation enhancement of the hydrate reservoir, and improves the energy efficiency and the economy of the natural gas hydrate exploitation.
Claims (2)
1. A natural gas hydrate exploitation method for heating a stratum by electric pulses is characterized in that: the method comprises the following steps:
1) laying a production well on the hydrate reservoir stratum according to a conventional mode;
2) arranging electrodes in the mining well, connecting the electrodes to the ground surface, and filling seawater below the top surface of a hydrate reservoir stratum in the mining well to realize the coupling of the electrodes and the hydrate reservoir stratum;
3) inserting electrodes into the hydrate reservoir stratum at equal intervals between two adjacent production wells in a pipe ramming mode, wherein the electrodes are arranged in a straight line and connected to the ground surface in parallel;
4) respectively connecting the two adjacent electrodes to the positive electrode and the negative electrode of the high-voltage pulse discharge equipment; after the high-voltage pulse discharging equipment is charged by adopting a ground power supply, a discharging switch is turned on, and the high-voltage pulse electric energy realizes discharging and heating on a hydrate reservoir through two adjacent electrodes;
5) determining the pulse discharge operation times according to the stratum temperature change condition until the hydrate reservoir is suitable for exploitation;
6) and sequentially connecting the electrodes arranged between the two adjacent production wells with high-voltage pulse discharge equipment, and repeating the step 4) and the step 5) to uniformly heat the hydrate reservoir between the two adjacent production wells.
2. A method for producing natural gas hydrates from an electrical pulse heated formation according to claim 1, wherein: the spacing between the production wells is 500m, and the spacing between the ramming pipes between the production wells is 50 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911095694.0A CN110685655B (en) | 2019-11-11 | 2019-11-11 | Natural gas hydrate exploitation method for heating stratum by electric pulse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911095694.0A CN110685655B (en) | 2019-11-11 | 2019-11-11 | Natural gas hydrate exploitation method for heating stratum by electric pulse |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110685655A true CN110685655A (en) | 2020-01-14 |
| CN110685655B CN110685655B (en) | 2021-10-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911095694.0A Expired - Fee Related CN110685655B (en) | 2019-11-11 | 2019-11-11 | Natural gas hydrate exploitation method for heating stratum by electric pulse |
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| Country | Link |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1609409A (en) * | 2004-11-23 | 2005-04-27 | 中国科学院广州能源研究所 | Method and apparatus for producing natural gas hydras utilizing microwave heating |
| CN102536177A (en) * | 2012-03-21 | 2012-07-04 | 甘肃兰金民用爆炸高新技术公司 | Positive-pressure blasting device |
| US20150090455A1 (en) * | 2013-09-30 | 2015-04-02 | Chevron U.S.A. Inc. | Natural Gas Hydrate Reservoir Heating |
| CN107542440A (en) * | 2017-10-23 | 2018-01-05 | 大庆东油睿佳石油科技有限公司 | A kind of method of U-shaped well microwave heating exploitation of gas hydrate |
| CN109162708A (en) * | 2018-08-14 | 2019-01-08 | 山东科技大学 | Reservoir parameter multidimensional monitoring device in a kind of simulating hydrate recovery process |
-
2019
- 2019-11-11 CN CN201911095694.0A patent/CN110685655B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1609409A (en) * | 2004-11-23 | 2005-04-27 | 中国科学院广州能源研究所 | Method and apparatus for producing natural gas hydras utilizing microwave heating |
| CN102536177A (en) * | 2012-03-21 | 2012-07-04 | 甘肃兰金民用爆炸高新技术公司 | Positive-pressure blasting device |
| US20150090455A1 (en) * | 2013-09-30 | 2015-04-02 | Chevron U.S.A. Inc. | Natural Gas Hydrate Reservoir Heating |
| CN107542440A (en) * | 2017-10-23 | 2018-01-05 | 大庆东油睿佳石油科技有限公司 | A kind of method of U-shaped well microwave heating exploitation of gas hydrate |
| CN109162708A (en) * | 2018-08-14 | 2019-01-08 | 山东科技大学 | Reservoir parameter multidimensional monitoring device in a kind of simulating hydrate recovery process |
Non-Patent Citations (2)
| Title |
|---|
| 杨服民 等: "高压电脉冲处理油层技术研究与应用", 《石油钻采工艺》 * |
| 韩笑 等: "热激法开采天然气水合物研究进展", 《油气储运》 * |
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| CN110685655B (en) | 2021-10-08 |
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Granted publication date: 20211008 |