CN107130944B - A method of employing geothermal energy exploitation of gas hydrate hiding in the way of fluid circulation - Google Patents
A method of employing geothermal energy exploitation of gas hydrate hiding in the way of fluid circulation Download PDFInfo
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- CN107130944B CN107130944B CN201710573395.8A CN201710573395A CN107130944B CN 107130944 B CN107130944 B CN 107130944B CN 201710573395 A CN201710573395 A CN 201710573395A CN 107130944 B CN107130944 B CN 107130944B
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- hydrate
- layer
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- geothermal
- fluid
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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 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
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
Abstract
The method that the invention discloses a kind of to employ geothermal energy exploitation of gas hydrate hiding in the way of fluid circulation, a bite heating power well is mainly beaten through sea bottom hydrate layer and its underpart geothermal layer, injection fluid returns to hydrate Tibetan area domain after heat exchange, promote decomposition of hydrate using geothermal energy, the natural gas decomposited is produced by the horizontal perforated interval of top producing well under the effect of gravity.Its specific practice are as follows: beat the concentric cast heating power well of a bite through hydrate layer and its underpart geothermal layer on sea, cold fluid is injected in well mouth oil pipe, fluid is heated after the sleeve pipe of shaft bottom by geothermal layer, heating fluid returns to hydrate layer and provides energy for decomposition of hydrate, to assist producing well to carry out decompression exploitation.The method that the present invention is combined using decompression and heating, equipment are simple and convenient to operate, and economy is strong, provide guidance for large scale mining hydrate hiding.
Description
Technical field
The present invention relates to a kind of methods for exploiting sea bed gas hydrate, espespecially establish a bite heating power well and are followed using fluid
The method that ring mode employs geothermal energy exploitation of gas hydrate hiding.
Background technique
With the development of economic technology, demand of the whole world to the energy is growing day by day, especially to oil and gas
Demand persistently increases, however conventional gas and oil resource belongs to non-renewable resources, with the continuous reduction of conventional gas and oil resource, very
Rule petroleum resources start by extensive concern all over the world.Gas hydrates are called combustible ice, are that one kind is distributed in seabed
In deposit or land-based area permafrost, by natural gas and the molecular class ice-like solid crystalline solid of moisture.Gas hydrates
Burning only generates carbon dioxide and water, does not pollute the environment, is a kind of new green energy.
The recovery method that ocean gas hydrate is imagined at present mainly has thermal excitation extraction system, decompression extraction system, chemistry
Extraction system and solids production method are injected in agent.But the above various production techniques have the limitation of its own, as thermal excitation is exploited
Method heat loss is big, efficiency of heating- utilization is low；Extraction system is depressured only when gas hydrates are located near temperature and pressure equilibrium boundary,
Just there is economic feasibility；It is slow to the effect of gas hydrates layer and costly that chemical agent injects extraction system.
Research shows that China South Sea sea bed gas hydrate and geothermal energy resources all very abundants, as can effective use underground heat
Resource can avoid causing environmental pollution, meet the requirement of sustainable development, however not propose still a kind of to utilize geothermal energy at present
The method of exploitation of gas hydrate hiding, largely constrains the Efficient Development of gas hydrates.The present invention proposes
A bite heating power well development geothermal energy is established, and transfers thermal energy to hydrate layer, promotes decomposition of hydrate, realizes and utilizes geothermal energy
The purpose of gas hydrates is developed, equipment is simple and convenient to operate, and economy is strong, can be hidden for large scale mining hydrate
Guidance is provided.
Summary of the invention
The method that the present invention relates to a kind of to employ geothermal energy exploitation of gas hydrate hiding in the way of fluid circulation, mainly
The following steps are included:
(1) according to block geological tectonic environment, selecting seabed to contain hydrate hiding and hydrate layer lower part, there are geothermal layers
Block as measure region, geothermal layer temperature is at 120 DEG C or more；
(2) two mouthfuls of well constructions, one heating power well and producing well well group are made a call to, wherein heating power well is made of four parts, including two
Vertical well section, two net horizontal sections, different well sections obtain higher heat exchange efficiency using the heat insulation layer of different location, specific to bore
Well step are as follows: bore vertical well section (1) to hydrate layer apart from topAt position, it is 500~1500m's that deflecting, which generates length,
Net horizontal section (2) then bores in the middle part of vertical well section (3) to geothermal layer at the top of distanceAt position, deflecting generates length and exists
Fluid communication is not present with stratum, wherein the horizontal perforation of producing well in 1000m level above well section (4), the heating power well not perforation
Section is located at hydrate layer top apart from topIt is at position and parallel with heating power well net horizontal section (2) and be positioned above；
(3) producing well carries out decompression exploitation, and the fluid injection rate for controlling the heating power well is 50~150m3/ d,
The development scheme produced using oil pipe sprue bushing, injects cold fluid in its well mouth oil pipe, and fluid enters oil after reaching shaft bottom
Simultaneously with geothermal layer heat exchange occurs for annular space between managing casing, by carrying when heating fluid returns to hydrate layer through casing
Energy transmission is thermally decomposed to hydrate, hydrate, and under gravity, the natural gas for decomposing generation is produced through the top
The extraction of well water flat fire hole section；
(4) the production gas velocity degree for continuing to monitor producing well is lower than 1000~2000m when producing gas velocity degree3Heating power well stops when/d
Injection, producing well stop exploitation.
The beneficial effects of the present invention are:
It utilizes the geothermal energy exploitation of gas hydrate of earth formation deep, can greatly reduce the heat injection in recovery process
Cost greatly improves recovery ratio.Present device is simple and convenient to operate, and can open up a new approach for hydrate.
Detailed description of the invention
Fig. 1 is heating power well and producing well well group exploitation hydrate hiding schematic diagram.
Fig. 2 is the vertical well section of heating power well (1) casing programme schematic diagram.
Fig. 3 is heating power well net horizontal section (2) casing programme schematic diagram.
Fig. 4 is the vertical well section of heating power well (3) casing programme schematic diagram.
Fig. 5 is heating power well net horizontal section (4) casing programme schematic diagram.
In figure: 1, the vertical well section of heating power well (1)；2, heating power well net horizontal section (2)；3, the vertical well section of heating power well (3)；4, hot
Power well net horizontal section (4)；5, gas hydrates；6, geothermal layer；7, heating power well；8, producing well；9, heat insulation layer；10, it seals
Shaft bottom.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings, but does not limit practical range of the invention.
According to block geological tectonic environment, selecting seabed to contain hydrate hiding and hydrate layer lower part, there are the areas of geothermal layer
For block as measure region, geothermal layer temperature is 150 DEG C；
As shown in Figure 1, make a call to two mouthfuls of well constructions, one heating power well 7 and 8 well group of producing well in measure region, wherein heating power well 7
It is made of four parts, including two vertical well sections, two net horizontal sections, different well sections are using the thermal insulation layer 9 of different location to obtain
To higher heat exchange efficiency, specific drilling phase are as follows: bore vertical well section (1) to hydrate layer 5 apart from topAt position, deflecting
The net horizontal section (2) that length is 1000m is generated, is then bored at the top of vertical well section (3) to 6 middle part distance of geothermal layerAt position, make
The net horizontal section (4) that length is 1000m is tiltedly generated, fluid communication is not present with stratum, wherein producing well 8 in the not perforation of heating power well 6
Horizontal perforated interval is located at 5 top of hydrate layer apart from topIt is at position and parallel with heating power well 7 net horizontal section (2)；
As shown in Figure 1, producing well 8 carries out decompression exploitation, the fluid injection rate of control heating power well 7 is 70m3/ d is used
The development scheme of oil pipe sprue bushing extraction, injects cold fluid in its well mouth oil pipe, fluid reach enter behind shaft bottom oil pipe with
Simultaneously with geothermal layer 6 heat exchange occurs for annular space between casing, by the energy of carrying when heating fluid returns to hydrate layer 5 through casing
Amount passes to hydrate, and hydrate is thermally decomposed, and under gravity, decomposes the natural gas of generation through 8 water of top producing well
The extraction of flat fire hole section；
The production gas velocity degree for continuing to monitor producing well 8 is lower than 1000m when producing gas velocity degree3Heating power well stops injection, production when/d
Well stops exploitation.
The part that do not address in detail above is the common knowledge of those of ordinary skill in the art, and the present invention is not limited to
Preferred forms are stated, it is all to have with of the invention anyone should learn that the structure change made under the inspiration of the present invention
Same or similar technical solution, falls within the scope of the present invention.
Claims (9)
1. a kind of method for employing geothermal energy exploitation of gas hydrate hiding in the way of fluid circulation, it is same to beat a bite on sea
Heart cast heating power well runs through hydrate layer and its underpart geothermal layer, and cold fluid is injected in well mouth oil pipe, and fluid enters in shaft bottom
Heated after casing by geothermal layer, heating fluid returns to hydrate layer and for decomposition of hydrate provides energy, to assist producing well into
Row decompression exploitation, to greatly improve recovery ratio, it is characterised in that comprise the following steps that:
Step (1): according to block geological tectonic environment, selecting seabed to contain hydrate hiding and hydrate layer lower part, there are geothermal layers
Block as measure region；
Step (2): making a call to two mouthfuls of well constructions, one heating power well and producing well well group, wherein the horizontal perforated interval of the producing well is located at water
Nitride layer is closed apart from topAt position, wherein the heating power well is drilled into hydrate layer apart from topAt position, deflecting is raw
At the net horizontal section for having certain length, lower part geothermal layer is then drilled into apart from topAt position, deflecting generation has a fixed length
The net horizontal section of degree, the heating power well not perforation, therefore fluid communication is not present with stratum；
Step (3): the producing well carries out decompression exploitation, injects cold fluid in the well mouth oil pipe of the heating power well, fluid arrives
Heat exchange occurs into the annular space between oil pipe and casing after up to shaft bottom and with geothermal layer, heating fluid is returned through casing and is hydrated
By the energy transmission of carrying to hydrate when nitride layer, hydrate is thermally decomposed, and under gravity, decomposes the natural gas of generation
Through the horizontal perforated interval extraction of producing well described in top；
Step (4): continuing to monitor the production gas velocity degree of producing well, is lower than 1000~2000m when producing gas velocity degree3Heating power well stops when/d
Injection, producing well stop exploitation.
2. a kind of side for employing geothermal energy exploitation of gas hydrate hiding in the way of fluid circulation as described in claim 1
Method, which is characterized in that it is heating secondary buck exploitation that hydrate, which hides mining method, and energy needed for decomposition of hydrate is by geothermal layer
It provides.
3. a kind of side for employing geothermal energy exploitation of gas hydrate hiding in the way of fluid circulation as described in claim 1
Method, which is characterized in that the heating power well is made of four parts, including two vertical well sections, two net horizontal sections, is specifically connected to
Sea well section (1) vertical with hydrate layer, positioned at hydrate layer lower part net horizontal section (2), be connected to hydrate layer and underground heat
The vertical well section (3) of layer and the net horizontal section (4) in the middle part of geothermal layer.
4. a kind of side for employing geothermal energy exploitation of gas hydrate hiding in the way of fluid circulation as described in claim 1
Method, which is characterized in that the geothermal layer temperature is at 120 DEG C or more.
5. a kind of side for employing geothermal energy exploitation of gas hydrate hiding in the way of fluid circulation as claimed in claim 3
Method, which is characterized in that the length of the net horizontal section (2) positioned at hydrate layer lower part is 500~1500m, described to be located at ground
The length of net horizontal section (4) in the middle part of thermosphere is in 1000m or more.
6. a kind of side for employing geothermal energy exploitation of gas hydrate hiding in the way of fluid circulation as claimed in claim 3
Method, which is characterized in that the net horizontal section (4) positioned at the net horizontal section (2) of hydrate layer lower part and in the middle part of geothermal layer
Oil pipe outside plus one layer of heat insulation layer with reduce oily tube fluid and cover tube fluid heat exchange；Oil in vertical well section (3)
Pipe is outer and casing adds one layer of heat insulation layer outside to reduce the loss of heat in the heating power well conveying heating flow liquid process.
7. a kind of side for employing geothermal energy exploitation of gas hydrate hiding in the way of fluid circulation as claimed in claim 6
Method, which is characterized in that the material of the heat insulation layer is polyethylene.
8. a kind of side for employing geothermal energy exploitation of gas hydrate hiding in the way of fluid circulation as claimed in claim 3
Method, which is characterized in that the horizontal perforated interval of producing well should with it is described be located at net horizontal section (2) of hydrate layer lower part it is parallel simultaneously
It is positioned above.
9. a kind of side for employing geothermal energy exploitation of gas hydrate hiding in the way of fluid circulation as described in claim 1
Method, which is characterized in that the fluid injection rate of the heating power well is 50~150m3/d。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710573395.8A CN107130944B (en) | 2017-07-14 | 2017-07-14 | A method of employing geothermal energy exploitation of gas hydrate hiding in the way of fluid circulation |
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| CN201710573395.8A CN107130944B (en) | 2017-07-14 | 2017-07-14 | A method of employing geothermal energy exploitation of gas hydrate hiding in the way of fluid circulation |
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| CN107130944A CN107130944A (en) | 2017-09-05 |
| CN107130944B true CN107130944B (en) | 2019-11-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108590594A (en) * | 2018-04-02 | 2018-09-28 | 齐鲁工业大学 | A kind of method and apparatus system to be tapped natural gas using sea surface warm water |
| CN109736754A (en) * | 2019-03-06 | 2019-05-10 | 大连理工大学 | A kind of device and method using hot dry rock exploitation of gas hydrate |
| CN109882133A (en) * | 2019-03-06 | 2019-06-14 | 大连理工大学 | A kind of device and method using discarded high temperature and pressure gas reservoir exploitation gas hydrates |
| CN112392445B (en) * | 2020-11-09 | 2022-05-17 | 中国海洋石油集团有限公司 | Combined exploitation system and method for hydrate reservoir and conventional oil and gas reservoir |
| CN112483052B (en) * | 2020-12-21 | 2023-11-10 | 吉林大学 | Device and method for inhibiting generation of shaft hydrate by circulating seawater |
| CN116411887B (en) * | 2023-06-05 | 2023-08-18 | 太原理工大学 | Device and method for exploiting coal bed gas by utilizing geothermal energy |
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