CN108505976B - Method for decompression exploitation of marine natural gas hydrate by using coupling freezing wall - Google Patents
Method for decompression exploitation of marine natural gas hydrate by using coupling freezing wall Download PDFInfo
- Publication number
- CN108505976B CN108505976B CN201810226738.8A CN201810226738A CN108505976B CN 108505976 B CN108505976 B CN 108505976B CN 201810226738 A CN201810226738 A CN 201810226738A CN 108505976 B CN108505976 B CN 108505976B
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- Prior art keywords
- natural gas
- hydrate
- pipe network
- wall
- freezing
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 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 27
- 230000008014 freezing Effects 0.000 title claims abstract description 23
- 238000007710 freezing Methods 0.000 title claims abstract description 23
- 230000008878 coupling Effects 0.000 title claims abstract description 9
- 238000010168 coupling process Methods 0.000 title claims abstract description 9
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 9
- 230000006837 decompression Effects 0.000 title claims abstract description 6
- 238000005057 refrigeration Methods 0.000 claims abstract description 18
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000003345 natural gas Substances 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000013049 sediment Substances 0.000 claims abstract description 3
- 238000004519 manufacturing process Methods 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 2
- -1 natural gas hydrates Chemical class 0.000 claims 2
- 239000003507 refrigerant Substances 0.000 claims 2
- 150000004677 hydrates Chemical class 0.000 claims 1
- 239000004576 sand Substances 0.000 abstract description 6
- 239000007788 liquid Substances 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 238000003860 storage Methods 0.000 abstract description 3
- 230000001737 promoting effect Effects 0.000 abstract description 2
- 230000000903 blocking effect Effects 0.000 abstract 1
- 239000013535 sea water Substances 0.000 description 6
- 239000007787 solid Substances 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011549 displacement method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Images
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
- 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
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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
- E21B41/0099—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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C1/00—Producing ice
Abstract
The invention discloses a method for utilizing a coupling freezing wall to depressurize and exploit ocean natural gas hydrate, which comprises the following steps: (1) leading a refrigeration pipe network into a sediment layer above a marine hydrate reservoir with high abundance of natural gas hydrate and below the seabed; (2) circularly injecting refrigerating fluid into the refrigerating pipe network to convert free water in the settled layer into ice and form a freezing wall around the refrigerating pipe network; (3) after the freezing wall is formed, carrying out decompression exploitation on the hydrate reservoir at the lower part of the freezing wall; (4) the produced natural gas is stored and transported. The refrigeration pipe network is positioned in a sedimentary layer above the hydrate reservoir and below the seabed and is close to the target hydrate reservoir, and the refrigeration liquid circularly flows in the refrigeration pipe network. After the freeze wall is formed, the storage layer environment cannot be obviously influenced. The method can effectively prevent sand blocking in the process of exploiting the hydrate by the conventional depressurization method, and has important significance for promoting the realization of safe and effective exploitation of the natural gas hydrate reservoir.
Description
Technical Field
The invention relates to a method for producing natural gas hydrate by depressurization, in particular to a method for producing marine natural gas hydrate by utilizing coupling freezing walls.
Background
The natural gas hydrate is a non-stoichiometric solid compound formed by natural gas and water under high pressure and low temperature, and is widely distributed in land frozen soil environments and deep water stratum environments such as oceans and lakes. It is estimated that the area of seafloor natural gas hydrate distribution accounts for about 10% of the total global ocean area, the total accounting for more than 90% of global hydrate resource reserves. Therefore, how to effectively exploit the ocean natural gas hydrate has very important significance.
The existing reported natural gas hydrate exploitation methods include a depressurization method, a heating method, a displacement method, an inhibitor injection method, a solid fluidization exploitation method and the like. Among them, the pressure-reducing mining method is considered to be one of the most promising mining techniques due to its simple operation. In 2013, the ocean natural gas hydrate is tried to be exploited by adopting a depressurization method in the eastern sea area of Japan, and the exploitation of the hydrate is forced to be stopped due to serious sand production. The sand production reasons in the marine natural gas hydrate exploitation process mainly include the following: firstly, a hydrate reservoir is a non-diagenetic reservoir, and the strength of the reservoir is reduced along with the decomposition of the hydrate; secondly, liquid water is generated after the hydrate is decomposed, most importantly, after the solid hydrate is decomposed, a large amount of seawater permeates from a settled layer on the upper part of a hydrate reservoir stratum, the seawater and hydrate decomposed gas are generated together, the flowing of the seawater has a great carrying effect on settled fine particles, the production of the fine particles causes the blockage of a production well and a production pipeline, and the high-efficiency safe production of the marine natural gas hydrate is severely restricted.
In a word, how to prevent the seawater on the upper part of the hydrate deposit layer from permeating into the reservoir layer in the process of the sea natural gas hydrate depressurization exploitation and further inhibit the phenomena of sand production and sand blockage in the exploitation well and the exploitation pipeline has very important significance for the safe and effective implementation of the hydrate exploitation technology.
Disclosure of Invention
The invention aims to provide a method for exploiting ocean natural gas hydrate by using a coupling freezing wall depressurization method, which is characterized in that a refrigeration pipe network is introduced into an upper settled layer rich in natural gas hydrate storage, refrigeration liquid is injected into the refrigeration pipe network, so that a freezing wall is formed around the refrigeration pipe, the permeability of the settled layer is obviously reduced until seawater cannot permeate, and then the target hydrate reservoir at the lower part of the freezing wall is exploited for depressurization.
In order to achieve the technical purpose, the invention adopts the following technical scheme.
A method for exploiting marine natural gas hydrate by utilizing coupling freezing walls to reduce pressure sequentially comprises the following steps:
(1) leading a refrigeration pipe network into a sediment layer above a marine hydrate reservoir with high abundance of natural gas hydrate and below the seabed;
(2) circularly injecting refrigerating fluid into the refrigerating pipe network to convert free water in the settled layer into ice and form a freezing wall around the refrigerating pipe network;
(3) after the freezing wall is formed, carrying out decompression exploitation on the hydrate reservoir at the lower part of the freezing wall;
(4) the produced natural gas is stored and transported.
The refrigeration pipe network is positioned in a sedimentary layer above the hydrate reservoir and below the seabed and is close to the target hydrate reservoir, and the refrigeration liquid circularly flows in the refrigeration pipe network.
The refrigeration pipe network is arranged on the upper part of the hydrate reservoir and is adjacent to the hydrate reservoir, and after the freezing wall is formed, the storage environment is not obviously influenced.
Preferably, the above method also has the following features: the refrigerating fluid can be recycled.
Preferably, the above method also has the following features: the natural gas production well may pass through the freeze wall or may be opened alongside the freeze wall.
Compared with the prior art, the invention has the following beneficial effects:
the method combines the freeze wall technology with the depressurization method for exploiting the marine natural gas hydrate, can effectively prevent the phenomenon of sand blockage in an exploitation well caused by seawater infiltration due to the decomposition of the hydrate in the conventional depressurization method for exploiting the hydrate, ensures the safety and stability of the exploitation process, and has important significance for promoting the realization of safe and effective exploitation of the natural gas hydrate reservoir.
Drawings
FIG. 1 is a schematic flow chart of the method for producing marine natural gas hydrate by coupling freezing walls to reduce pressure.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
As shown in figure 1, the invention relates to a method for producing marine natural gas hydrate by depressurization through a coupling freezing wall, wherein a refrigeration pipe network is positioned in a sedimentary layer below the seabed and above a marine natural gas hydrate reservoir layer with high abundance of natural gas hydrate.
The method comprises the following steps:
(1) leading a refrigeration pipe network into a deposition layer above and below the seabed of a hydrate reservoir with rich hydrate reservoirs, wherein the refrigeration pipe network is adjacent to the hydrate reservoir;
(2) circularly injecting a refrigerating fluid into the refrigerating pipe to ensure that a freezing wall is formed around the pipe network;
(3) after the freezing wall is formed, carrying out decompression exploitation on the hydrate reservoir;
(4) the produced natural gas is stored and transported.
The present invention is not limited to the above-described embodiments, and various modifications are possible for those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A method for exploiting marine natural gas hydrate by utilizing coupling freezing walls to reduce pressure sequentially comprises the following steps:
(1) leading a refrigeration pipe network into a sediment layer above a marine hydrate reservoir with high abundance of natural gas hydrate and below the seabed;
(2) circularly injecting refrigerating fluid into the refrigerating pipe network to convert free water in the settled layer into ice and form a freezing wall around the refrigerating pipe network;
(3) after the freezing wall is formed, carrying out decompression exploitation on the hydrate reservoir at the lower part of the freezing wall;
(4) the produced natural gas is stored and transported.
2. The method for the depressurization production of natural gas hydrates from sea using a coupled freeze wall as claimed in claim 1 wherein the refrigeration piping network is located close to the target hydrate and a refrigerant fluid is circulated therethrough.
3. The method for the depressurization production of ocean gas hydrates using the coupled freeze wall of claim 1, wherein the refrigerant fluid is recycled.
4. The method for depressurization production of marine natural gas hydrates using a coupled freeze wall according to claim 1, wherein the natural gas production well may be passed through the freeze wall or may be opened from the side of the freeze wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810226738.8A CN108505976B (en) | 2018-03-19 | 2018-03-19 | Method for decompression exploitation of marine natural gas hydrate by using coupling freezing wall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810226738.8A CN108505976B (en) | 2018-03-19 | 2018-03-19 | Method for decompression exploitation of marine natural gas hydrate by using coupling freezing wall |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108505976A CN108505976A (en) | 2018-09-07 |
| CN108505976B true CN108505976B (en) | 2020-12-11 |
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| CN201810226738.8A Expired - Fee Related CN108505976B (en) | 2018-03-19 | 2018-03-19 | Method for decompression exploitation of marine natural gas hydrate by using coupling freezing wall |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113107433A (en) * | 2020-01-13 | 2021-07-13 | 中国石油大学(北京) | Exploitation method of natural gas hydrate |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008120767A1 (en) * | 2007-03-30 | 2008-10-09 | Mitsui Engineering & Shipbuilding Co., Ltd. | Process for producing mixed gas hydrate |
| CN101892846A (en) * | 2010-07-13 | 2010-11-24 | 中铁三局集团有限公司 | Shield burial method for receiving and plugging overexcavation gap in high-water-pressure stratum |
| CN102817596A (en) * | 2012-09-05 | 2012-12-12 | 韩中枢 | Ocean combustible ice mining device and method |
| CN103277072A (en) * | 2013-05-16 | 2013-09-04 | 李贤明 | Method and system for exploiting seabed natural gas hydrate |
| CN103498648A (en) * | 2013-10-17 | 2014-01-08 | 中国科学院广州能源研究所 | Method and device for exploiting aquo-complex through combination of pressure reducing technology and hydraulic fracturing technology |
| CN103867165A (en) * | 2014-03-14 | 2014-06-18 | 大连理工大学 | Device and method for safely and efficiently exploiting ocean natural gas hydrate through depressurizing decomposition |
| CN104061013A (en) * | 2014-06-23 | 2014-09-24 | 中国矿业大学 | Method and device for improving permeability of low-permeability coal bed by utilizing freezing process |
| CN105781499A (en) * | 2016-04-12 | 2016-07-20 | 青岛海洋地质研究所 | Method for multistage sand prevention of ocean natural gas hydrate depressurization production |
-
2018
- 2018-03-19 CN CN201810226738.8A patent/CN108505976B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008120767A1 (en) * | 2007-03-30 | 2008-10-09 | Mitsui Engineering & Shipbuilding Co., Ltd. | Process for producing mixed gas hydrate |
| CN101892846A (en) * | 2010-07-13 | 2010-11-24 | 中铁三局集团有限公司 | Shield burial method for receiving and plugging overexcavation gap in high-water-pressure stratum |
| CN102817596A (en) * | 2012-09-05 | 2012-12-12 | 韩中枢 | Ocean combustible ice mining device and method |
| CN103277072A (en) * | 2013-05-16 | 2013-09-04 | 李贤明 | Method and system for exploiting seabed natural gas hydrate |
| CN103498648A (en) * | 2013-10-17 | 2014-01-08 | 中国科学院广州能源研究所 | Method and device for exploiting aquo-complex through combination of pressure reducing technology and hydraulic fracturing technology |
| CN103867165A (en) * | 2014-03-14 | 2014-06-18 | 大连理工大学 | Device and method for safely and efficiently exploiting ocean natural gas hydrate through depressurizing decomposition |
| CN104061013A (en) * | 2014-06-23 | 2014-09-24 | 中国矿业大学 | Method and device for improving permeability of low-permeability coal bed by utilizing freezing process |
| CN105781499A (en) * | 2016-04-12 | 2016-07-20 | 青岛海洋地质研究所 | Method for multistage sand prevention of ocean natural gas hydrate depressurization production |
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| CN108505976A (en) | 2018-09-07 |
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