CN105201481B - Liquid CO2Phase transformation multiple spot fracturing anti-reflection method - Google Patents
Liquid CO2Phase transformation multiple spot fracturing anti-reflection method Download PDFInfo
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- CN105201481B CN105201481B CN201510668034.2A CN201510668034A CN105201481B CN 105201481 B CN105201481 B CN 105201481B CN 201510668034 A CN201510668034 A CN 201510668034A CN 105201481 B CN105201481 B CN 105201481B
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Abstract
The invention discloses a kind of liquid CO being used in coal seam2Technology that phase transformation multiple spot fracturing is anti-reflection, mainly solves that gas permeability of coal seam is poor, the difficult a series of problems of gas pumping.The present invention includes the fracturing test drilling being arranged in coal seam, and liquid CO is provided with fracturing test drilling2Fracturing pipe, more liquid CO2Fracturing pipe is cascaded, in liquid CO2Two hole packers are connected behind fracturing pipe, using push rod by liquid CO2Fracturing pipe and hole packer are pushed in test drilling.Liquid CO2Fracturing pipe is connected using conductive lead wire and is connected with the mining initiator being arranged on outside test drilling.After above-mentioned arrangement is completed, sealing of hole is carried out, with mining initiator to more with liquid CO2Fracturing pipe heats, and makes CO2Liquid is changed into the CO of high pressure within a short period of time2Gas, effect is carried out to coal body and produces crack, so as to improve the extraction efficiency of gas.Present invention additionally comprises to liquid CO2Fracturing drills and the arrangement distance of extraction borehole and the selection of time.
Description
Technical field
The present invention relates to coal seam fracturing anti-reflection method, specially a kind of liquid CO2Phase transformation multiple spot fracturing anti-reflection method.
Background technology
China's coal-mine is mostly high methane low-permeable mine, liquid CO2Phase transformation fracturing technology is the spy according to China's coal-mine
A kind of essential safe type and the reliable anti-reflection technology in New Coal Mine coal seam of point and demand exploitation.The technology is carried out in some mines
Part type approval test, original technology are liquid CO2, following defect be present in phase transformation single-point fracturing：
（1）Liquid CO2The energy deficiency of single-point fracturing release, the crack that the destruction to coal seam is formed is too small, and coal seam is breathed freely
Property increase unobvious；
（2）Liquid CO2Single-point fracturing is too small to the coverage in coal seam；
（3）Liquid CO2Single-point fracturing is due to the CO of release2Very little, for the drilling of drilling depth length, bore inner space
It is too big, good fracturing effect can not be played.
Therefore it is imperative to develop a kind of coal seam fracturing method that can effectively overcome above-mentioned technological deficiency.
The content of the invention
The present invention is the current liquid CO of solution2The energy deficiency of single-point fracturing release, the crack that the destruction to coal seam is formed
Too small, gas permeability of coal seam increases unconspicuous technical problem, there is provided a kind of liquid CO2Phase transformation multiple spot fracturing anti-reflection method.
The present invention is realized using following technical scheme：A kind of liquid CO2Phase transformation multiple spot fracturing anti-reflection method, in coal seam
Lining puts one group of fracturing test drilling, and a set of liquid CO is arranged in each fracturing test drilling2Fracturing device, coal seam is carried out
Liquid CO2Phase transformation multiple spot fracturing, increase the gas permeability in coal seam；Fracturing completes backed off after random liquid CO2Fracturing device and in each fracturing
Negative pressure extraction pipeline is connected in test drilling and carries out gas pumping, while two are arranged between two adjacent fracturing test drillings
Extraction borehole also carries out gas pumping, accelerates the extraction of coal gas.
Further, described liquid CO2Fracturing device includes be arranged in fracturing test drilling more and is connected in series
Liquid CO2Fracturing pipe, the more liquid CO2Fracturing pipe is connected with conductive lead wire, conductive lead wire one end and liquid CO2Cause
Split pipe to be mutually connected in fracturing test drilling, the other end is drawn out to outside fracturing test drilling and is connected with mining initiator；The cause
Split in test drilling and be sequentially arranged two hole packers for being used for sealing of hole close to the position of drilling outlet, two hole packers with most
Latter liquid CO2Fracturing pipe is connected, and hole packer connects a high-pressure water pipe, and it is outer with beating that high-pressure water pipe is connected to fracturing test drilling
Press pump connects；Above-mentioned connection equipment is pushed into the testing position in fracturing test drilling by push rod, the push rod other end is with boring
Machine is connected.
After above-mentioned arrangement is completed, sealing of hole is carried out, with mining initiator to more liquid CO2Fracturing pipe heats, and makes
CO2Liquid is changed into the CO of high pressure within a short period of time2Gas, effect is carried out to coal body and produces crack, so as to improve taking out for gas
Adopt efficiency.
Further, described sealing of hole is to make hole packer swollen toward water filling in hole packer by high-pressure water pipe using pressuring pump
It is swollen to be brought into close contact with fracturing test drilling wall, so as to play the effect of sealing of hole.
Further, the hole packer of arrangement is located in fracturing test drilling at 20 meters in the fracturing test drilling, according to
The distance of hole packer to fracturing test drilling borehole bottom location determines liquid CO2The quantity of fracturing pipe is 5~10.
Adjacent fracturing test drilling spacing is 20 meters, between two extraction boreholes between adjacent fracturing test drilling
Away from for 6 meters；The spacing of extraction borehole and adjacent fracturing test drilling is 7 meters.As shown in Figure 2.
The invention mainly comprises the content of two aspects, first, determining liquid CO according to fracturing test drilling length2Fracturing
The quantity of pipe, then pass through liquid CO2Phase transformation multiple spot fracturing technology is acted on coal seam, increases the gas permeability in coal seam, improves extraction effect
Rate；Second, by fracturing test drilling and the arrangement of extraction borehole, liquid CO is improved2To the action effect and model in coal seam
Enclose, make extraction borehole obtain maximizing extraction effect.The spacing of used fracturing test drilling and the spacing of extraction borehole
Extraction work can be completed to greatest extent, it is ensured that gas resources make full use of.
Brief description of the drawings
Fig. 1 fracturing test drillings fracturing arranges schematic diagram.
Fig. 2 extraction boreholes arrange schematic diagram.
1- fracturing test drillings, 2- extraction boreholes, 3- liquid CO2Fracturing pipe, 4- conductive lead wires, 5- is mining initiator, 6-
Hole packer, 7- high-pressure water pipes, 8- pressuring pumps, 9- push rods, 10- rigs.
Embodiment
Patent of the present invention is described further below in conjunction with accompanying drawing.
Liquid CO2Phase transformation multiple spot fracturing anti-reflection method, the arrangement of fracturing test drilling in drilling as shown in figure 1, be disposed with
More liquid CO2Fracturing pipe（Quantity is determined by drillable length）, and hole packer, liquid CO2Fracturing pipe is connected by conductive lead wire
Connect, the other end is connected with the initiator outside test drilling, and hole packer is connected using high-pressure water pipe with pressuring pump, is connected after the completion of connection
Connect push rod fracturing pipe and hole packer are pushed in fracturing test drilling, the push rod other end is connected with rig, then passes through
Pressuring pump is to hole packer water filling sealing of hole, then passes through the liquid CO in initiator detonation test drilling2Fracturing pipe, produce high-pressure gaseous
CO2Coal body is acted on, form crack, increase the gas permeability of coal body.The arrangement of drilling is as shown in Fig. 2 the first cloth in coal body
Fracturing test drilling is put, the spacing of adjacent fracturing test drilling is 20 meters, and liquid CO is carried out by above-mentioned arrangement2Phase transformation multiple spot causes
Split, fracturing backed off after random fracturing device simultaneously connects negative pressure extraction pipeline progress gas pumping.Cloth between two neighboring fracturing test drilling
Put two extractions to drill and connect the progress extraction of extraction pipeline, accelerate gas pumping speed.Mining initiator is used to control liquid
State CO2CO in fracturing pipe2Expand and produce high pressure, to realize coal seam fracturing.
The present invention mainly utilizes more liquid CO2Fracturing pipe to coal body carry out fracturing it is anti-reflection, reasonable Arrangement test drilling with
The distance of extraction borehole, the gas permeability and gas pumping efficiency in coal seam are improved, length is 80~150 meters of brill suitable for coal seam
Hole.The method disclosed in the present and used data can improve fracturing effect and gas pumping effect to greatest extent
Fruit, the recovery utilization rate of resource is improved, reduce job costs.
Claims (2)
- A kind of 1. liquid CO2Phase transformation multiple spot fracturing anti-reflection method, it is characterised in that：In coal seam, lining puts one group of fracturing test drilling （1）, in each fracturing test drilling（1）The middle a set of liquid CO of arrangement2Fracturing device, liquid CO is carried out to coal seam2Phase transformation multiple spot causes Split, increase the gas permeability in coal seam；Fracturing completes backed off after random liquid CO2Fracturing device and in each fracturing test drilling（1）Middle company Connect negative pressure extraction pipeline and carry out gas pumping, while in two adjacent fracturing test drillings（1）Between arrange two extraction boreholes （2）Also gas pumping is carried out, accelerates the extraction of coal gas；The drillable length is 80~150 meters；Described liquid CO2Fracturing device includes being arranged on fracturing test drilling（1）The liquid CO that interior more are connected in series2Cause Split pipe（3）, the more liquid CO2Fracturing pipe（3）With conductive lead wire（4）Series connection, conductive lead wire（4）One end and liquid CO2Cause Split pipe（3）Mutually it is connected in fracturing test drilling（1）Interior, the other end is drawn out to fracturing test drilling（1）It is outer and be connected with mining detonation Device（5）；The fracturing test drilling（1）The inherent position close to drilling outlet is sequentially arranged two hole packers for being used for sealing of hole （6）, two hole packers（6）With last root liquid CO2Fracturing pipe（3）Series connection, hole packer（6）Connect a high-pressure water pipe（7）, High-pressure water pipe（7）It is connected to fracturing test drilling（1）Outside and pressuring pump（8）Connection；Pass through push rod（9）Above-mentioned connection equipment is pushed Enter fracturing test drilling（1）Interior testing position, push rod（9）The other end and rig（10）It is connected；The hole packer of arrangement in the fracturing test drilling（6）Positioned at fracturing test drilling（1）At interior 20 meters, according to hole packer （6）To fracturing test drilling（1）The distance of borehole bottom location determines liquid CO2Fracturing pipe（3）Quantity be 5~10；Adjacent fracturing test drilling（1）Spacing is 20 meters, positioned at adjacent fracturing test drilling（1）Between two extraction boreholes （2）Spacing be 6 meters；Extraction borehole（2）With adjacent fracturing test drilling（1）Spacing be 7 meters.
- 2. liquid CO as claimed in claim 12Phase transformation multiple spot fracturing anti-reflection method, it is characterised in that：Described sealing of hole is to utilize Pressuring pump（8）Pass through high-pressure water pipe（7）Toward hole packer（6）In water filling, make hole packer（6）Expansion and fracturing test drilling（1）Wall It is brought into close contact, so as to play the effect of sealing of hole.
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| CN106194244B (en) * | 2016-08-04 | 2017-07-25 | 重庆大学 | Lower permeability seam liquid phase CO2Phase transformation fracturing is anti-reflection grid type gas pumping method |
| CN106285609B (en) * | 2016-08-04 | 2017-11-07 | 重庆大学 | A kind of hypotonic coal seam liquid carbon dioxide phase transformation fracturing coal uncovering method of high methane |
| CN106223919B (en) * | 2016-08-19 | 2020-06-12 | 中煤科工集团重庆研究院有限公司 | Carbon dioxide phase change perforation presplitting permeability increasing device |
| CN106321048A (en) * | 2016-09-21 | 2017-01-11 | 河南神华能源工程有限公司 | Gas phase fracturing technology-based device and method for eliminating gas burst |
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| CN111561848A (en) * | 2020-05-25 | 2020-08-21 | 广东中人岩土工程有限公司 | Deep hole liquid carbon dioxide cold explosion method |
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