CN104712302A - Cyclic freezing-melting anti-reflection method for low-permeability coal-bed gas reservoir - Google Patents
Cyclic freezing-melting anti-reflection method for low-permeability coal-bed gas reservoir Download PDFInfo
- Publication number
- CN104712302A CN104712302A CN201510173050.4A CN201510173050A CN104712302A CN 104712302 A CN104712302 A CN 104712302A CN 201510173050 A CN201510173050 A CN 201510173050A CN 104712302 A CN104712302 A CN 104712302A
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- coal
- freezing
- bed gas
- gas reservoir
- well
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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
- E21B36/00—Heating, cooling, insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/001—Cooling arrangements
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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
- E21B36/00—Heating, cooling, insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/04—Heating, cooling, insulating arrangements for boreholes or wells, e.g. for use in permafrost zones using electrical heaters
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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
- E21B43/16—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
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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
- E21B43/16—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 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Abstract
The invention discloses a cyclic freezing-melting anti-reflection method for a low-permeability coal-bed gas reservoir. The method comprises the following steps: injecting liquid water into a coal-bed gas reservoir through a hydraulic fracturing manner; injecting a refrigerating fluid into a refrigerating well which is punched in the coal-bed gas reservoir in advance, and refrigerating the liquid water in the coal-bed gas reservoir; and unfreezing the frozen liquid water by a radio frequency heating method, wherein the liquid water in the freezing-melting process expands with heat and contracts with cold, so that a new crack is generated by a surrounding rock medium in the coal-bed gas reservoir; the processes are repeated until the rock body in the coal-bed gas reservoir is loosened and broken by repeated freezing-melting action; a plurality of artificial cracks are generated; and a coal-bed gas adsorbed in the coal-bed gas reservoir is repelled, so that the target of increasing the air permeability is realized. The method is simple to operate and high in geological condition adaptability; the technological difficulty existing in the prior art are overcome; and safe and efficient extraction of the low-permeability coal-bed gas reservoir can be realized.
Description
Technical field
The invention belongs to coal bed gas extraction technical field, particularly utilize the method for circulating freezing resistance to improve the gas permeability original position anti-reflection method of low permeability coal seam gas reservoir.
Background technology
Coal bed gas (also known as gas) just progressively highlights as the strategic position of a kind of unconventional clean energy resource in Chinese primary energy consumption.Actively push forward the Safety production questions that coal bed gas extraction technology not only can solve coal industry, also can alleviate the energy resource structure crisis of growing tension to a great extent.Along with the extension of the pit mining degree of depth, geostatic stress strengthens thereupon, and the gas permeability in coal seam reduces, and extraction difficulty increases thereupon.Domestic and international experts and scholars launch to study widely for coal bed gas extraction technology, and external conventional coal bed gas extraction technology comprises drainage gas recovery, reservoir excitement yield-increasing technology, reservoir simulation technology and surface drilling hydraulic fracturing technology.The peupendicular hole pressure break of domestic autonomous Design and multi-branched horizontal well technique, and liquid nitrogen pressure break, carbon dioxide injection, Cavity Completion Well Methods have also entered the industrial experiment stage.Restrict by China's Occurrence of Coalbed Methane condition and reservoiring mechanism, the efficient extraction of the solution low permeability coal seam gas that existing technology still can not be fully effective.
Chinese patent 200810079794.X discloses a kind of method of pumping coalbed gas by heating coal bed, by multiple vertical drilling, gas production producing well is carried out to the mist of drainage and step-down extraction coal bed gas and steam, obtain the coal bed gas of gaseous state and liquid distilled water after subsequently the mist of coal bed gas and steam being cooled, realize mist and be separated extraction coal bed gas then.The comparatively large and coal bed gas that adsorptivity is strong for buried depth, can not effectively effectively be expelled coal bed gas from coal seam reservoirs by heating.
Chinese patent ZL200520018054.7 discloses a kind of Well bore enclosed type coal bed air extraction well exploiting coal bed gas in coalfield, be connected the coal road of pit shaft by connecting in the pit shaft of ground with coal seam, coal seam and form from many coal holes that coal road is constructed, in pit shaft, laying the tracheae connecting coal road and ground aspiration pump.There is closed well lid to be closed by coal road in pit shaft, the coal bed gas in coal seam enters coal inlet, coal road, tracheae be evacuated to ground by ground aspiration pump.For low permeability coal seam gas, need the coal number of perforations of construction significantly to increase, engineering quantity is large, and the extraction cycle is long.
For this reason, the present invention proposes a kind of method utilizing rock destruction mechanism of frost-thawing to increase low permeability coal seam gas permeability, in coalbed methane reservoir, inject aqueous water by the method for hydrofracturing, then in the freezing well set in advance in coalbed methane reservoir, inject freezing liquid and the aqueous water of coalbed methane reservoir is carried out freezing.Thawed by aqueous water after freezing by the method for radio frequency heating subsequently, in frozen-thaw process, aqueous water expands with heat and contract with cold, thus makes surrounding rocks in coalbed methane reservoir produce newborn crack.Repeat said process, until multigelation makes the rock mass loose crushing in coalbed methane reservoir, thus produce a large amount of people for crack, the coal bed gas be adsorbed in coalbed methane reservoir is expelled, thus realizes the object increasing gas permeability.
Summary of the invention
The object of this invention is to provide a kind of simple to operate, geological conditions adaptable low permeability coal seam gas reservoir anti-reflection method, overcome the technological difficulties that prior art exists, realize the safe and efficient extraction of low permeability coal seam gas.
Low permeability coal seam gas reservoir circulating freezing resistance anti-reflection method of the present invention is: first set freezing well from ground to pre-extraction region, in freezing well, arrange radio heater, and the radio frequency heating pipe network be communicated with radio heater of constructing.Subsequently in the boring of pre-extraction region construction hydrofracturing, by hydrofracturing equipment, aqueous water is pressed in initial fissure tiny in coalbed methane reservoir, produces newborn crack under pressure.The freezing liquid injecting freezing well is adopted to carry out freezing to the aqueous water being flowing in initial fissure and newborn crack.After all aqueous waters are consolidated into ice, by the radio heater be arranged in freezing well, pre-extraction region is heated, solid water is dissolved, in melting process, the effect of expanding with heat and contract with cold of aqueous water can make the surrounding rocks in pre-extraction region produce how newborn crack, and aqueous water moves freely in through crack.Circulate this process repeatedly, and the surrounding rocks in coalbed methane reservoir can be made to produce more newborn crack, and the coal bed gas be originally adsorbed in coalbed methane reservoir starts to expel, thus realizes the object increasing gas permeability.
Low permeability coal seam gas reservoir circulating freezing resistance anti-reflection method of the present invention, is characterized in that.
(1) after pre-extraction region is drawn a circle to approve on ground, to the freezing well of coalbed methane reservoir vertical construction.Freezing well spacing is between 20-25 rice.
(2) freezing liquid by injecting-50 DEG C, freezing well carries out freezing to the newborn crack produced after hydrofracturing boring aqueous water pressure break surrounding rocks.
(3) being furnished with the radio heater be communicated with radio frequency heating pipe network in freezing well, providing power by the ground transformer station being arranged in ground, thawing for carrying out heating to the aqueous water after freezing.
(4) from the boring of ground construction hydrofracturing, the spacing of wells is between 20-25 rice, and the increase part of horizontal boring that hydrofracturing boring is suitable while the boring of construction vertical direction, fracturing is carried out in segmentation.
Accompanying drawing explanation
The present invention is further illustrated below in conjunction with accompanying drawing.
Fig. 1 is the freezing well of the present invention and sealed tube network arrangements schematic diagram.
Fig. 2 is along the sectional drawing of A-A in Fig. 1.
Fig. 3 is that sectional drawing is arranged in hydrofracturing of the present invention boring.
Fig. 4 is the effect generalized section after iterative cycles freeze thawing of the present invention.
In figure: 1-ground; The pre-extraction region of 2-; 3-ground transformer station; 4-hydrofracturing equipment; The freezing well of 5-; 6-coalbed methane reservoir top board; 7-coalbed methane reservoir base plate; 8-radio heater; 9-freezing liquid; 10-radio frequency heating pipe network; 11-hydrofracturing is holed; 12-coal bed gas extraction borehole; 13-aqueous water; 14-preexisting crack; The newborn crack of 15-.
Detailed description of the invention
Fig. 1, Fig. 2 give freezing well and sealed tube network arrangements schematic diagram and sectional drawing.As shown in the figure, after ground (1) determines pre-extraction region (2), by array pitch construction between 25 meters perpendicular to the freezing well (5) of ground (1), stop construction when freezing well (5) arrives coalbed methane reservoir base plate (7).The freezing liquid (9) of-50 DEG C injects freezing well (5), the aqueous water (13) that the hydrofracturing equipment (4) being arranged in ground (1) injects pre-extraction region (2) by hydrofracturing boring (11) is freezed, the radio heater (8) be arranged in freezing well (5) being supplied power by ground transformer station (3) is heated the aqueous water (13) freezed between coalbed methane reservoir top board (3) and coalbed methane reservoir base plate (4) by radio frequency heating pipe network (10), move in circles, realize the freeze-thaw damage of the interior rock of pre-extraction region (2).
Fig. 3 gives hydrofracturing drilling construction schematic diagram.As shown in Figure 3, pre-extraction region (2) construction hydrofracturing boring (11), when arriving between coalbed methane reservoir top board (6) and coalbed methane reservoir base plate (7), hydrofracturing boring (11) in construction level direction, aqueous water (13) is injected pre-extraction region (2) by the hydrofracturing equipment (4) that employing is arranged in ground (1), the basis of preexisting crack (14) produces newborn crack (15), aqueous water (13) can flow freely in preexisting crack (14) and newborn crack (15), coal bed gas extracts ground (1) out by the coal bed gas extraction borehole (12) on through ground.
Fig. 4 gives the effect generalized section after iterative cycles freeze thawing of the present invention.Carry out freezing rear use radio heater (8) by freezing liquid (9) to the surrounding rocks in pre-extraction region (2) to thaw, surrounding rocks between coalbed methane reservoir top board (6) and coalbed methane reservoir base plate (7) is expanded with heat and contract with cold, last fragmentation, newborn crack (15) and preexisting crack (14) through, be adsorbed on coal bed gas gas permeability between coalbed methane reservoir top board (6) and coalbed methane reservoir base plate (7) and effectively strengthened.
Claims (1)
1. a low permeability coal seam gas reservoir circulating freezing resistance anti-reflection method, is characterized in that:
A (), after pre-extraction region is drawn a circle to approve on ground, to the freezing well of coalbed methane reservoir vertical construction, freezing well spacing is between 20-25 rice;
B () carries out freezing by the freezing liquid injecting-50 DEG C, freezing well to the newborn crack produced after hydrofracturing boring aqueous water pressure break surrounding rocks;
Being furnished with the radio heater be communicated with radio frequency heating pipe network in (c) freezing well, providing power by the ground transformer station being arranged in ground, thawing for carrying out heating to the aqueous water after freezing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510173050.4A CN104712302A (en) | 2015-04-14 | 2015-04-14 | Cyclic freezing-melting anti-reflection method for low-permeability coal-bed gas reservoir |
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|---|---|---|---|
| CN201510173050.4A CN104712302A (en) | 2015-04-14 | 2015-04-14 | Cyclic freezing-melting anti-reflection method for low-permeability coal-bed gas reservoir |
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| CN104712302A true CN104712302A (en) | 2015-06-17 |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104963660A (en) * | 2015-07-17 | 2015-10-07 | 煤炭科学技术研究院有限公司 | Liquid nitrogen freeze-thawing cracking coal-bed permeability-increasing coal-bed gas mining method |
| CN105136837A (en) * | 2015-07-24 | 2015-12-09 | 中国矿业大学 | Test system and test method of liquid nitrogen circulation freeze-thawing permeability-increasing simulation of coal rock sample |
| CN105606482A (en) * | 2016-01-11 | 2016-05-25 | 辽宁工程技术大学 | Method for testing accumulated damage effects of liquid nitrogen on fracture structures of water-containing coal samples |
| CN106014408A (en) * | 2016-07-07 | 2016-10-12 | 华北科技学院 | Goaf overlaying hard rock mass fracturing device and method |
| WO2017020516A1 (en) * | 2015-08-03 | 2017-02-09 | 中国矿业大学 | Gas extraction method based on liquid nitrogen cyclic freeze-thaw anti-reflection by drill holes in horizontal orientation |
| CN106907140A (en) * | 2017-04-28 | 2017-06-30 | 新疆大学 | Hydrodynamic closure type coal bed gas high productivity layer position based on well-log information determines method |
| CN107091798A (en) * | 2017-04-21 | 2017-08-25 | 中国矿业大学 | Anxious formula cold and heat succeed each other coalbed methane reservoir transformation analogue means |
| CN109252847A (en) * | 2018-11-16 | 2019-01-22 | 中国石油大学(北京) | The method and device of water and cryogen alternating fracturing control coal seam fracture extension |
| CN109317257A (en) * | 2018-10-17 | 2019-02-12 | 金彬 | A kind of building materials material sorting process |
| CN109577939A (en) * | 2018-12-25 | 2019-04-05 | 徐州工程学院 | A kind of method that big temperature difference Frozen-thawed cycled strengthens shale gas exploitation |
| CN112832715A (en) * | 2021-01-07 | 2021-05-25 | 安徽理工大学 | Intelligent multiphase fracturing coupling carbon dioxide flooding coal bed gas extraction system |
| CN117231186A (en) * | 2023-11-14 | 2023-12-15 | 西安洛科电子科技股份有限公司 | Layered pressure driving device for pressure driving water injection and pressure driving system thereof |
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2015
- 2015-04-14 CN CN201510173050.4A patent/CN104712302A/en active Pending
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104963660B (en) * | 2015-07-17 | 2017-10-24 | 煤炭科学技术研究院有限公司 | The coal bed methane exploring method that a kind of frozen-thawed cracking coal seam is anti-reflection |
| CN104963660A (en) * | 2015-07-17 | 2015-10-07 | 煤炭科学技术研究院有限公司 | Liquid nitrogen freeze-thawing cracking coal-bed permeability-increasing coal-bed gas mining method |
| CN105136837A (en) * | 2015-07-24 | 2015-12-09 | 中国矿业大学 | Test system and test method of liquid nitrogen circulation freeze-thawing permeability-increasing simulation of coal rock sample |
| US10577891B2 (en) | 2015-08-03 | 2020-03-03 | Science Academy Of China University Of Mining And Technology | Using horizontal directional drilling and liquid nitrogen cyclic freeze-thaw process to improve permeability in gas drainage |
| WO2017020516A1 (en) * | 2015-08-03 | 2017-02-09 | 中国矿业大学 | Gas extraction method based on liquid nitrogen cyclic freeze-thaw anti-reflection by drill holes in horizontal orientation |
| CN105606482A (en) * | 2016-01-11 | 2016-05-25 | 辽宁工程技术大学 | Method for testing accumulated damage effects of liquid nitrogen on fracture structures of water-containing coal samples |
| CN106014408B (en) * | 2016-07-07 | 2018-07-06 | 华北科技学院 | A kind of apparatus and method of goaf overlying solid rock fracturing |
| CN106014408A (en) * | 2016-07-07 | 2016-10-12 | 华北科技学院 | Goaf overlaying hard rock mass fracturing device and method |
| CN107091798A (en) * | 2017-04-21 | 2017-08-25 | 中国矿业大学 | Anxious formula cold and heat succeed each other coalbed methane reservoir transformation analogue means |
| CN107091798B (en) * | 2017-04-21 | 2019-07-09 | 中国矿业大学 | Simulator is transformed in anxious formula hot and cold alternation coalbed methane reservoir |
| CN106907140A (en) * | 2017-04-28 | 2017-06-30 | 新疆大学 | Hydrodynamic closure type coal bed gas high productivity layer position based on well-log information determines method |
| CN109317257A (en) * | 2018-10-17 | 2019-02-12 | 金彬 | A kind of building materials material sorting process |
| CN109317257B (en) * | 2018-10-17 | 2020-08-18 | 湖北晶標建筑工程有限公司 | Building material sorting process |
| CN109252847A (en) * | 2018-11-16 | 2019-01-22 | 中国石油大学(北京) | The method and device of water and cryogen alternating fracturing control coal seam fracture extension |
| CN109577939A (en) * | 2018-12-25 | 2019-04-05 | 徐州工程学院 | A kind of method that big temperature difference Frozen-thawed cycled strengthens shale gas exploitation |
| CN109577939B (en) * | 2018-12-25 | 2020-09-01 | 徐州工程学院 | Method for strengthening shale gas exploitation through large-temperature-difference freeze-thaw cycle |
| CN112832715A (en) * | 2021-01-07 | 2021-05-25 | 安徽理工大学 | Intelligent multiphase fracturing coupling carbon dioxide flooding coal bed gas extraction system |
| CN117231186A (en) * | 2023-11-14 | 2023-12-15 | 西安洛科电子科技股份有限公司 | Layered pressure driving device for pressure driving water injection and pressure driving system thereof |
| CN117231186B (en) * | 2023-11-14 | 2024-02-02 | 西安洛科电子科技股份有限公司 | Layered pressure driving device for pressure driving water injection and pressure driving system thereof |
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Application publication date: 20150617 |