CN105201481B - Liquid CO2Phase transformation multiple spot fracturing anti-reflection method - Google Patents

Liquid CO2Phase transformation multiple spot fracturing anti-reflection method Download PDF

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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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China
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fracturing
liquid
test drilling
drilling
pipe
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CN201510668034.2A
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Chinese (zh)
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CN105201481A (en
Inventor
张国亮
申晋伟
尚玮炜
罗华贵
赵学良
陈备
王宁
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山西晋煤集团技术研究院有限责任公司
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Priority to CN201510668034.2A priority Critical patent/CN105201481B/en
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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

Liquid CO2Phase transformation multiple spot fracturing anti-reflection method
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)

  1. 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. 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.
CN201510668034.2A 2015-10-17 2015-10-17 Liquid CO2Phase transformation multiple spot fracturing anti-reflection method CN105201481B (en)

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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
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
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
CN106382108B (en) * 2016-10-21 2019-07-16 河南神华能源工程有限公司 Well fracturing and removal and stimulation method based on CO2 gas phase fracturing technique
US20200018144A1 (en) * 2017-04-06 2020-01-16 Bobby L. Haney Charge based stimulation of adjacent wells to form interconnected fracture network and hydrocarbon production therefrom
CN107035366B (en) * 2017-04-27 2020-02-21 中国平煤神马能源化工集团有限责任公司 Method for measuring permeability increasing range of coal bed liquid carbon dioxide phase transition fracturing
CN107327291B (en) * 2017-06-29 2019-05-14 重庆大学 A kind of method of the best pattern of determining carbon dioxide phase transformation fracturing coal seam anatonosis
CN107327297B (en) * 2017-06-29 2019-05-21 重庆大学 Anatonosis validity check drilling method for arranging for carbon dioxide phase transformation fracturing coal seam
CN109931060A (en) * 2017-12-15 2019-06-25 中国矿业大学 A kind of gas-liquid combination orientation fracturing device and method
CN109611057B (en) * 2018-12-28 2020-11-03 吕梁学院 Carbon dioxide fracturing and permeability increasing device for coal bed gas extraction
CN110017124A (en) * 2019-03-05 2019-07-16 重庆大学 Coal-bed gas enhanced gas extraction method and extraction system based on phase-change heat-storage material
CN109723488A (en) * 2019-03-05 2019-05-07 重庆大学 Utilize the gas pumping method and extraction system of phase-change material auxiliary liquid nitrogen fracturing
CN109958421B (en) * 2019-03-19 2020-07-03 中国矿业大学(北京) Pre-crack hydraulic fracturing roof cutting pressure relief construction method and drilling machine
CN110905504A (en) * 2019-11-25 2020-03-24 绍兴文理学院 Directional cracking device based on carbon dioxide phase change expansion and use method

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