CN104806218A - Method and system for improving recovery efficiency of shale gas well - Google Patents

Method and system for improving recovery efficiency of shale gas well Download PDF

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Publication number
CN104806218A
CN104806218A CN201510168036.5A CN201510168036A CN104806218A CN 104806218 A CN104806218 A CN 104806218A CN 201510168036 A CN201510168036 A CN 201510168036A CN 104806218 A CN104806218 A CN 104806218A
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China
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line
liquid
rammell
shale gas
pipeline
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CN201510168036.5A
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CN104806218B (en
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赵瑜
陈宇超
何力
何鹏飞
陈海林
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Chongqing University
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Chongqing University
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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
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures
    • 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
    • E21B28/00—Vibration generating arrangements for boreholes or wells, e.g. for stimulating production
    • 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

Abstract

The invention relates to a method and a system for improving recovery efficiency of a shale gas well. The method includes that paving pipelines; filling high-pressure CO2 into the pipeline in a horizontal well, enabling the high-pressure air to knock to form a series of high-pressure air pulse vibration to puncture the hollow pipe wall and horizontal well wall, and forming a primary seam in a shale layer; pressing liquid CO2 to the primary seam position of the shale layer through the pipeline, heating the rock at the primary seam position of the shale layer, and enabling the liquid CO2 to change phase to vaporize quickly to generate a series of high-pressure air pulse vibration to crack the primary seam in the shale layer again; dividing the pipeline in the horizontal well into several segments through a plurality of dividers, and using said method to produce seams segment by segment for the shale layer segments corresponding to the pipeline segments. According to the method for improving the recovery efficiency of the shale gas well, by means of the CO2 phase change mode, the crack degree of the shale layer is effectively improved, and the recovery efficiency of the shale gas well is improved.

Description

A kind of method and system improving shale gas well recovery
Technical field
The present invention relates to shale gas acquisition technique field, specifically refer to a kind of method and system improving shale gas well recovery.
Background technology
Shale gas refers to that tax is stored in rich organic mud stone and interlayer thereof, and to adsorb or free state is the Unconventional forage of main existing way, composition is based on methane.In recent years, U.S.'s shale gas exploration and development technological break-through, output increased fast, realized its " natural gas revolution ", produces significant impact, rewritten world energy sources general layout greatly to international market for natural gas and world energy sources general layout.
The many Basin Developings of China have many cover coal measures and dark-coloured mud, shale formation, there is the advantage of root gas/shale gas growth in the tight sand of the large cover of alternating layers distribution, the natural gas of different scales finds, but in large area region, not yet realizes the further breakthrough of natural gas exploration at present.Data shows, and Marine Sedimentary Rock in South China shale formation may be the main enrichment area of shale gas.In addition, pine the Liao Dynasty, Erdos, the shale formation of telling the continental sedimentary basins such as Kazakhstan, Zhunger Basin also have basis and the condition of shale gas enrichment.Qijiang County, Chongqing City, Wan Sheng, Nanchuan, WuLong, Peng River, the tenth of the twelve Earthly Branches sun, the best metallogenic belt of district city shale gas resource such as the Xiushan Mountain and Wuxi, be therefore confirmed as surveying survey target area with implementing in the first batch.
Shale rock has the characteristics such as compact structure, hard, ultralow permeability, and thus shale gas exploitation is very difficult.The technical scheme of current U.S. exploitation shale gas well maturation is staged fracturing of horizontal well.Staged fracturing of horizontal well exploitation shale gas is adopted also to there is following deficiency:
1, water consumption is huge, and more than 10,000 side's water generally wanted by pressure break a bite well, thus it is limited to make it apply, and such as many mountain regions, south China area, hills, supply water very difficult, then can not apply the method.
2, fracturing fluid is comparatively serious to groundwater pollution, and does not meet current environmental requirement.
3, staged fracturing of horizontal well is when hydraulic pressure splits, and every section only produces a few crack, and the efficiency of aerogenesis is lower.
Summary of the invention
For the problems referred to above that prior art exists, it is few that first object of the present invention is to provide a kind of power consumption, pollutes little, and effectively can improve the method for shale gas well recovery.
Second object of the present invention is to provide a kind of system realizing aforementioned raising shale gas well recovery method.
For realizing above-mentioned first object, the present invention adopts following technical scheme: a kind of method improving shale gas well recovery, comprises the steps:
S1: main pipe line is laid, horizontal well of fetching water in rammell, then arranges pipeline in horizontal well and the vertical shaft that formed for horizontal well of fetching water;
S2: by high pressure CO 2pass in main pipe line the pipeline being arranged in horizontal well, pressure-air pinking, form a series of pressure-air pulsation vibrations, puncture hollow tube wall and the horizontal borehole wall, in rammell, form runstitching; Then by liquid CO 2by the runstitching position of pipeline press-in rammell, then the rock of runstitching position, rammell is heated, make liquid CO 2phase transformation rapid vaporization, produces the vibrations of a series of high pressure air pulse, again ftractures to the runstitching in rammell;
S3: the pipeline being positioned at horizontal well in main pipe line is divided into multistage by multiple dispenser, the shale interval that each depot siding is corresponding adopts the method segmentation in step S2 to make seam.
As optimization, squeeze into multiple heated well from earth's surface, and heated well divides with described rammell cracking unit relative, heated well is used for the rock of rammell and the liquid CO passing into runstitching position, rammell 2heat, make liquid CO 2rapid vaporization.
For realizing above-mentioned second object, the present invention adopts following technical scheme: a kind of system realizing above-mentioned raising shale gas well recovery method, comprises and make seam system and heating system;
Described seam system of making comprises the air compressor be positioned on earth's surface, high-pressure gas cartridge, storing liquid high pressure CO 2storage tank, a CO 2detector and make seam control unit, also comprises and is positioned at high pressure air rifle under earth's surface and Crack Monitoring device;
The liquid high pressure CO of shown storage tank 2delivery outlet and liquid CO 2feed-line is communicated with, shown liquid CO 2feed-line is provided with near the part of storage tank the electronic valve controlling storage tank and export;
The Compressed Gas outlet of described air compressor is communicated with the gas access of high-pressure gas cartridge, gases at high pressure outlet and the gaseous state CO of high-pressure gas cartridge 2feed-line connects; Liquid CO 2feed-line and gaseous state CO 2the one end be positioned on earth's surface is communicated with feed-line with main pipe line respectively, and described high pressure air rifle is communicated with the pipeline one end being positioned at horizontal well in main pipe line; The test side of described Crack Monitoring device is arranged on rammell, the data output end of Crack Monitoring device with make the crack signal receiving end stitching control unit and be connected, a CO 2the vaporization signal output part of detector with make the vaporization signal input part stitching control unit and be connected, described in make the gaseous state CO of seam control unit 2control signal output is connected with the control signal input of air compressor, makes the liquid CO of seam control unit 2control signal output and control signal input with control the electronic valve that storage tank exports and be connected;
Described heating system comprises heated well, CO 2gas cylinder, temperature control unit, admission line, pipeline of giving vent to anger, air preheat machine, temperature detector, heating rod and the 2nd CO 2detector;
Be provided with sleeve pipe in described heated well, described admission line and pipeline of giving vent to anger are arranged in sleeve pipe, one end of admission line and CO 2the gas outlet of gas cylinder is communicated with, and the bottom of pipeline of giving vent to anger is communicated with rammell;
Described heating rod is arranged in admission line, and heating rod is connected with air preheat machine;
Described 2nd CO 2the test side of detector is arranged in the pipeline in horizontal well, the 2nd CO 2the vaporization signal output part of detector is connected with the vaporization signal input part of temperature control unit, the test side of temperature detector is arranged in admission line, the temperature signal output of temperature detector is connected with the temperature signal input of temperature control unit, and the first temperature signal output of temperature control unit is connected with the temperature signal input of air preheat machine.
As optimization, described storing liquid high pressure CO 2storage tank be provided with normal pressure protective device and normal temperature protective device.
As optimization, described admission line is positioned in the part outside sleeve pipe and is also provided with gas preheater, and the second temperature signal output of temperature control unit is connected with the temperature signal input of gas preheater.
As optimization, described system also comprises booster pump and the first cooler, and described booster pump and the first cooler are successively set on main pipe line from top to bottom and are positioned at part on earth's surface.
As optimization, describedly also comprise shale gas recovery line, one end and the main pipe line of described shale gas recovery line are positioned at upper end, earth's surface and are communicated with.
As optimization, describedly also comprise the second coolant pump and Liquid segregation device, described second coolant pump and Liquid segregation device are successively set in shale gas recovery line from bottom to top.
As optimization, described shale gas recovery line, liquid CO 2feed-line and gaseous state CO 2feed-line is positioned at upper end, earth's surface respectively by cross valve and is communicated with main pipe line.
Relative to prior art, tool of the present invention has the following advantages:
1, the method for raising shale gas well recovery provided by the invention adopts CO 2air detonation tentatively makes seam to horizontal well, then by liquid CO 2the runstitching position of press-in rammell, finally again to the rock heat of runstitching position, rammell, makes the liquid CO in runstitching position, rammell 2reach CO 2critical-temperature, thus rapid vaporization produces the vibrations of a series of high pressure air pulse, act on the rock of rammell, impulse shock in shale superposition at rock interior, produce pressure to rise condition, rock interior runstitching end is continued to rammell in-house development, thus improves shale gas well recovery.
2, in addition, the heated well squeezed into from earth's surface, by after rock heat, can not only reduce the adsorption rate of shale gas at rock, can also improve the cracking ability of rock, thus improves shale gas well recovery further.
3, the method for raising shale gas well recovery provided by the invention mainly passes through CO 2in a disguised form carry out making seam, compare and existingly make seam by water under high pressure, not only little to the pollution of underground water, more environmental protection, and application does not limit by water source, application more extensively, be the more important thing is, the method seam better effects if is made to rammell.
4, system provided by the invention has following beneficial effect and is: the system of this invention forms autonomous system by two covers and forms, overcome the complicated and diversified factor of topography and geomorphology, can simple and reliable under any environment, efficiently, the enforcement rammell of high extraction rate gathers, the particularly rammell of hyposmosis, and Dynamic System is simple, facilitates operated by personnel and maintenance; The core of present system is to liquid CO 2being heated to critical-temperature causes its phase transformation for splitting rammell, it solves the problem of environmental pollution that current hydrofracturing method is extensively disputed at present, and simultaneously common hydrofracturing method is easy blocking pipeline when injection water medium, but supercritical CO 2have gas concurrently and there is low viscosity and the easily high density of diffusion, liquid and diffluent characteristic, can effectively solve pipeline blockage problem.In addition rammell distribution is at present mainly in southwest, southwest lack of water, therefore selects fracturing cost higher when exploiting shale gas.Therefore, to sum up, present system has manageability, energy-conservation and higher economic worth, has higher comprehensive social benefit again.
Accompanying drawing explanation
Fig. 1 is the structural representation realizing the system improving shale gas well recovery method.
Fig. 2 is for making seam systematic schematic diagram.
Fig. 3 is heating system schematic diagram.
Label in figure represents, 10-makes seam system, 11-air compressor, 12-high-pressure gas cartridge, and 13-makes seam control unit, 14-high pressure air rifle, 15-Crack Monitoring device, 16-dispenser; 20-heating system, 21-gas cylinder, 22-admission line, 23-heating rod, 24-air preheat machine, 25-temperature detector, 26-CO 2detector, 27-temperature control unit, 28-gas preheater, 29-heated well; 30-rammell.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail.
In describing the invention, it will be appreciated that, term " on ", D score, " vertically ", " level ", " interior ", the orientation of the instruction such as " outward " or position relationship be for based on the orientation shown in accompanying drawing 1 or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise one or more these features.In describing the invention, the implication of " multiple " is two or more, unless otherwise expressly limited specifically.
embodiment 1:improve a method for shale gas well recovery, comprise the steps:
S1: pipe installation, horizontal well of fetching water in rammell, then arranges pipeline in horizontal well and the vertical shaft that formed for horizontal well of fetching water;
S2: by high pressure CO 2pass in main pipe line the pipeline being arranged in horizontal well, pressure-air pinking, form a series of pressure-air pulsation vibrations, puncture hollow tube wall and the horizontal borehole wall, in rammell, form runstitching;
Then the principle of fracturing is adopted, by liquid CO 2by the runstitching position of pipeline press-in rammell, then the rock of runstitching position, rammell is heated, make liquid CO 2phase transformation rapid vaporization, produces the vibrations of a series of high pressure air pulse, again ftractures to the runstitching in rammell.
Liquid CO 2reach CO 2critical-temperature rapid vaporization, produce a series of high pressure air pulse shock effect on the rock of rammell, impulse shock superposition in shale produces pressure at rock interior and to rise condition, rock interior runstitching end is continued to rammell in-house development, thus improves the cracking degree of the runstitching in rammell.
S3: the pipeline being positioned at horizontal well in main pipe line is divided into multistage by multiple dispenser, the shale interval that each depot siding is corresponding adopts the method segmentation in step S2 to make seam.
As optimization, squeeze into multiple heated well from earth's surface, and heated well divides with described rammell cracking unit relative, when specifically implementing, at least corresponding heated well of the shale interval that in horizontal well, every depot siding is corresponding, heated well is vertically arranged.Heated well is used for the rock of rammell and the liquid CO passing into runstitching position, rammell 2heat, make liquid CO 2rapid vaporization, ftractures again to the runstitching in rammell.The heated well squeezed into from earth's surface, by after rock heat, can not only reduce the adsorption rate of shale gas at rock, can also improve the cracking ability of rock, thus improves shale gas well recovery further.
This raising shale gas well recovery side ratio juris is as follows:
The operation threshold characteristic research of ROCK MECHANICS RESEARCH particularly rock proves, in down-hole to a series of pulsatile impact of rock, can be that rock porosity and permeability increase, if controlled pulsatile impact, then effectively can avoid the compaction to rock.Rock material is under Impact Load, and rock volume diminishes, after load sheds, there is remaining volume compression distortion, due to the inhomogeneities of load, rock is under the effect of three-dimensional differential pressure, volume does not only reduce to increase on the contrary, " pressure rise phenomenon " of Here it is rock.
1. CO 2the general principle that phase transformation improves shale gas well recovery is rock " pressure rise phenomenon " and CO 2critical-temperature.CO temperature less than 31 DEG C 2exist with liquid state, when temperature is more than 31 DEG C, no matter pressure is much, liquid CO 2to gasify in 40 milliseconds; The liquid CO of 1.0kg 2absorb the heat of 60.0KJ could gasify. studies have found that, when the minimum compression of rock and the ratio of maximum crushing stress are between 0.15 ~ 0.30, will occur " pressure rise phenomenon ".Because the minimum principal stress on stratum and the ratio of major principal stress be not within the scope of this, so " pressure rise phenomenon " can not be there is in natural conditions.Due to very high at crack tip stress value, to rise phenomenon so more easily produce pressure at crack Jian Chu.
CO 2the method of phase transformation first applies CO 2air detonation tentatively makes seam to horizontal well, then adopts the method for fracturing, by liquid CO 2split into runstitching position, form advance rock stratum, finally again by squeezing into the rock heat of heated well to runstitching position, rammell from earth's surface, make liquid CO 2reach CO 2critical-temperature, allow split into liquid CO 2rapid vaporization produces a series of high pressure air pulse shock effect on the rock of rammell, impulse shock superposition in shale produces pressure at rock interior and to rise condition, rock interior runstitching end is continued to rammell in-house development, improve the cracking degree of rammell internal fissure, the heated well simultaneously squeezed into is by after rock heat, the adsorption rate of shale gas at rock can not only be reduced, the cracking ability of rock can also be improved, improve shale gas well recovery further.
embodiment 2:realize the system of the method improving shale gas well recovery in enforcement 1, it comprises makes seam system and heating system.
Make seam system 10 and comprise the air compressor 11 be positioned on earth's surface, high-pressure gas cartridge 12, storing liquid high pressure CO 2storage tank 17, a CO 2detector 16 and make seam control unit 13, also comprises and is positioned at high pressure air rifle 14 under earth's surface and Crack Monitoring device 15.
The liquid high pressure CO of storage tank 17 2delivery outlet and liquid CO 2feed-line is communicated with, shown liquid CO 2feed-line is provided with near the part of storage tank 17 the electronic valve 17a controlling storage tank 17 and export.Storing liquid high pressure CO 2storage tank 17 be provided with normal pressure protective device and normal temperature protective device.
The Compressed Gas outlet of air compressor 11 is communicated with the gas access of high-pressure gas cartridge 12, gases at high pressure outlet and the gaseous state CO of high-pressure gas cartridge 12 2feed-line connects; Conveniently reclaim on shale gas earth's surface and also there is shale gas recovery line; Liquid CO 2feed-line, gaseous state CO 2feed-line is positioned at upper end, earth's surface respectively with the end of shale gas recovery line and is communicated with main pipe line.Conveniently, liquid CO 2feed-line, gaseous state CO 2feed-line is positioned at upper end, earth's surface with shale gas recovery line respectively by cross valve and is communicated with main pipe line, cross valve is preferably electronic valve, is convenient to control.
Due in the gas that main pipe line reclaims, except having shale gas, also CO may be had 2other gaseous states of gas and underground, therefore, shale gas recovery line is provided with the second coolant pump and Liquid segregation device from bottom to top successively, and the second coolant pump can effectively be separated with other gases to shale gas with arranging of Liquid segregation device, thus improves the rate of recovery of shale gas.
Main pipe line is positioned at the part on earth's surface, is provided with booster pump and the first cooler from top to bottom successively.Owing to inputting liquid and gaseous state CO 2pipeline long, liquid and gaseous state CO in course of conveying 2capital produces the pressure loss, and arranging of booster pump better can make up liquid and gaseous state CO 2crushing in course of conveying, is conducive to cracking.High pressure air rifle 14 is communicated with the pipeline one end being positioned at horizontal well in main pipe line.
The test side of Crack Monitoring device 15 is arranged on rammell, the data output end of Crack Monitoring device 15 with make the crack signal receiving end stitching control unit 13 and be connected, a CO 2the vaporization signal output part of detector 16 with make the vaporization signal input part stitching control unit 13 and be connected, described in make the gaseous state CO of seam control unit 13 2control signal output is connected with the control signal input of air compressor 11, makes the liquid CO of seam control unit 13 2control signal output and control signal input with control the electronic valve 17a that storage tank 17 exports and be connected; Gaseous state CO 2or gaseous state CO 2by respective feed-line, and then arrive horizontal well by main pipe line, spray finally by high pressure air rifle.
One CO 2the test side of detector 16 is arranged in the pipeline in horizontal well, for detecting liquid CO 2vaporization degree, make seam control unit 13 according to a CO 2liquid CO in the rammell of detector feedback 2the opening degree of vaporization extent control electronic valve 17a, thus control storing liquid high pressure CO 2storage tank 17 to delivering liquid CO in well 2amount.
The operating pressure position 5000psi of high pressure air rifle 14, the shuttle valve two sections of high pressure air rifle has detonate air chamber and a main gas tank respectively, from high-pressure gas cartridge 12 CO out 2gases at high pressure, enter the exhaust opening of high pressure air rifle main gas tank after control panel pressure regulation shunting.When after electromagnetic valve igniting, first discharge the gas opening gas explosion indoor, now shuttle valve disequilibrium, sliding to opening shot room direction, opening the exhaust opening of main gas tank simultaneously, making high pressure CO 2gas discharges rapidly, produces pulse.Pressure in high-pressure gas cartridge controls by controlling air compressor.
At CO 2phase transformation is ftractureed after rock again, by being arranged on the wave detector Real-Time Monitoring high pressure CO in horizontal well 2demolition effect, and pass to ground in time make seam control unit.Make demolition effect that seam control unit feed back according to wave detector and the crack effect that Crack Monitoring device feeds back regulates air compressor to be supplied to CO in high-pressure gas cartridge in time 2pressure.Make whole horizontal well tentatively make seam process and form closed-loop control, effectively control the size of runstitching, reach while increase recovery ratio, avoid the waste of energy, obtain larger business efficiency.
Heating system 20 comprises heated well, CO 2gas cylinder 21, temperature control unit 27, admission line 22, pipeline of giving vent to anger, air preheat machine 24, temperature detector 25, heating rod 23 and the 2nd CO 2detector 26.
Be provided with sleeve pipe in heated well, admission line 22 and pipeline of giving vent to anger are arranged in sleeve pipe, one end of admission line 22 and CO 2the gas outlet of gas cylinder is communicated with, and the bottom of pipeline of giving vent to anger is communicated with rammell, and pipeline of giving vent to anger is in order to discharge the associated hot hydrolysis products of rammell.
Heating rod 23 is arranged in admission line 22, and heating rod 23 is connected with air preheat machine 24, for the CO in admission line 22 2heat.During enforcement, admission line 22 is positioned in the part outside sleeve pipe and is also provided with gas preheater 28, and the second temperature signal output of temperature control unit 27 is connected with the temperature signal input of gas preheater 28.In order to further to the CO in admission line 22 2gas heats in advance, strengthens the heating effect to rammell rock.
2nd CO 2the test side of detector 26 is arranged in the pipeline in horizontal well, for detecting liquid CO 2vaporization degree, the 2nd CO 2the vaporization signal output part of detector 26 is connected with the vaporization signal input part of temperature control unit 27; The test side of temperature detector 27 is arranged in admission line 22, for detecting CO in admission line 22 2the temperature of gas, the temperature signal output of temperature detector 25 is connected with the temperature signal input of temperature control unit 27, and the first temperature signal output of temperature control unit 27 is connected with the temperature signal input of air preheat machine 24.
CO in the admission line that temperature control unit feeds back according to temperature detector 2the temperature of gas and the 2nd CO 2liquid CO in the rammell of detector feedback 2vaporization extent control air preheat machine and the work of gas preheater, thus make whole horizontal well tentatively make the formation of the dehiscence process again closed-loop control on seam basis, effective control is ftractureed the size in gap again, reach while increase recovery ratio, avoid the waste of energy, obtain larger business efficiency.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.

Claims (9)

1. improve a method for shale gas well recovery, it is characterized in that: comprise the steps:
S1: main pipe line is laid, horizontal well of fetching water in rammell, then arranges pipeline in horizontal well and the vertical shaft that formed for horizontal well of fetching water;
S2: by high pressure CO 2pass in main pipe line the pipeline being arranged in horizontal well, pressure-air pinking, form a series of pressure-air pulsation vibrations, puncture hollow tube wall and the horizontal borehole wall, in rammell, form runstitching; Then by liquid CO 2by the runstitching position of pipeline press-in rammell, then the rock of runstitching position, rammell is heated, make liquid CO 2phase transformation rapid vaporization, produces the vibrations of a series of high pressure air pulse, again ftractures to the runstitching in rammell;
S3: the pipeline being positioned at horizontal well in main pipe line is divided into multistage by multiple dispenser, the shale interval that each depot siding is corresponding adopts the method segmentation in step S2 to make seam.
2. improve the method for shale gas well recovery as claimed in claim 1, it is characterized in that: squeeze into multiple heated well from earth's surface, and heated well divides relative with described rammell cracking unit, heated well is used for the rock of rammell and the liquid CO passing into runstitching position, rammell 2heat, make liquid CO 2rapid vaporization.
3. realize the system improving shale gas well recovery method described in claim 2, it is characterized in that: comprise and make seam system and heating system;
Described seam system (10) of making comprises the air compressor (11) be positioned on earth's surface, high-pressure gas cartridge (12), storing liquid high pressure CO 2storage tank (17), a CO 2detector (16) and make seam control unit (13), also comprises and is positioned at high pressure air rifle (14) under earth's surface and Crack Monitoring device (15);
The liquid high pressure CO of shown storage tank (17) 2delivery outlet and liquid CO 2feed-line is communicated with, shown liquid CO 2feed-line is provided with near the part of storage tank (17) electronic valve (17a) controlling storage tank (17) and export;
The Compressed Gas outlet of described air compressor (11) is communicated with the gas access of high-pressure gas cartridge (12), gases at high pressure outlet and the gaseous state CO of high-pressure gas cartridge (12) 2feed-line connects; Liquid CO 2feed-line and gaseous state CO 2the one end be positioned on earth's surface is communicated with feed-line with main pipe line respectively, and described high pressure air rifle (14) is communicated with the pipeline one end being positioned at horizontal well in main pipe line; The test side of described Crack Monitoring device (15) is arranged on rammell, the data output end of Crack Monitoring device (15) with make the crack signal receiving end stitching control unit (13) and be connected, a CO 2the vaporization signal output part of detector (16) with make the vaporization signal input part stitching control unit (13) and be connected, described in make the gaseous state CO of seam control unit (13) 2control signal output is connected with the control signal input of air compressor (11), makes the liquid CO of seam control unit (13) 2control signal output and control signal input with control the electronic valve (17a) that storage tank (17) exports and be connected;
Described heating system (20) comprises heated well, CO 2gas cylinder (21), temperature control unit (27), admission line (22), pipeline of giving vent to anger, air preheat machine (24), temperature detector (25), heating rod (23) and the 2nd CO 2detector (26);
Be provided with sleeve pipe in described heated well, described admission line (22) and pipeline of giving vent to anger are arranged in sleeve pipe, one end of admission line (22) and CO 2the gas outlet of gas cylinder (21) is communicated with, and the bottom of pipeline of giving vent to anger is communicated with rammell;
Described heating rod (23) is arranged in admission line (22), and heating rod (23) is connected with air preheat machine (24);
Described 2nd CO 2the test side of detector (26) is arranged in the pipeline in horizontal well, the 2nd CO 2the vaporization signal output part of detector (26) is connected with the vaporization signal input part of temperature control unit (27), the test side of temperature detector (27) is arranged in admission line (22), the temperature signal output of temperature detector (25) is connected with the temperature signal input of temperature control unit (27), and the first temperature signal output of temperature control unit (27) is connected with the temperature signal input of air preheat machine (24).
4. improve the system of shale gas well recovery method as claimed in claim 3, it is characterized in that: described storing liquid high pressure CO 2storage tank (17) be provided with normal pressure protective device and normal temperature protective device.
5. improve the system of shale gas well recovery method as claimed in claim 3, it is characterized in that: described admission line (22) is positioned in the part outside sleeve pipe and is also provided with gas preheater (28), and the second temperature signal output of temperature control unit (27) is connected with the temperature signal input of gas preheater (28).
6. improve the system of shale gas well recovery method as claimed in claim 3, it is characterized in that: also comprise booster pump and the first cooler, described booster pump and the first cooler are successively set on main pipe line from top to bottom and are positioned at part on earth's surface.
7. improve the system of shale gas well recovery method as claimed in claim 3, it is characterized in that: also comprise shale gas recovery line, one end and the main pipe line of described shale gas recovery line are positioned at upper end, earth's surface and are communicated with.
8. improve the system of shale gas well recovery method as claimed in claim 7, it is characterized in that: also comprise the second coolant pump and Liquid segregation device, described second coolant pump and Liquid segregation device are successively set in shale gas recovery line from bottom to top.
9. as described in claim 7 or 8, improve the system of shale gas well recovery method, it is characterized in that: described shale gas recovery line, liquid CO 2feed-line and gaseous state CO 2feed-line is positioned at upper end, earth's surface respectively by cross valve and is communicated with main pipe line.
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