CN103541679A - Method for sealing underground hydraulic fracture drilled hole of coal mine in combined manner - Google Patents

Method for sealing underground hydraulic fracture drilled hole of coal mine in combined manner Download PDF

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Publication number
CN103541679A
CN103541679A CN201310483101.4A CN201310483101A CN103541679A CN 103541679 A CN103541679 A CN 103541679A CN 201310483101 A CN201310483101 A CN 201310483101A CN 103541679 A CN103541679 A CN 103541679A
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pvc pipe
pipe
fracturing
pvc
sealing
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CN103541679B (en
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翟成
林柏泉
李全贵
倪冠华
彭深
余旭
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China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
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Abstract

The invention discloses a method for sealing an underground hydraulic fracture drilled hole of a coal mine in a combined manner. The method includes constructing the hydraulic fracture drilled hole, then sequentially connecting a second pvc (polyvinyl chloride) pipe, a spindle-shaped pvc pipe and a first pvc pipe with one another, feeding the second pvc pipe, the spindle-shaped pvc pipe and the first pvc pipe into the drilled hole until the distance from an exposed end of the first pvc pipe to an orifice is 0.1m, and respectively plugging certain positions by polyurethane; injecting slurry into space between the plugged positions by the aid of an injection pipe; feeding a high-pressure capsule to a position separated from the inner side of the spindle-shaped pvc pipe by 1m by the aid of a fracture pipe after the slurry is solidified; enabling the high-pressure capsule to expand and performing hydraulic fracture by the aid of the fracture pipe; releasing the pressure of the high-pressure capsule after hydraulic fracture is completed, and then taking out the high-pressure capsule; connecting the pvc pipes with an underground gas pipe network and draining gas. The inner diameter of the spindle-shaped pvc pipe is uniformly gradually reduced from two ends to the middle of the spindle-shaped pvc pipe, the distance from one certain position to the front end of the second pvc pipe is 2m, and the distance from the other certain position to the orifice is 1m. The method for sealing the underground hydraulic fracture drilled hole has the advantages that the requirement on high-pressure resistance of the hydraulic fracture drilled hole and the requirement on the sealing performance of a gas drainage drilled hole can be met, the high-pressure capsule can be reused, a process is simple, potential safety hazards are prevented, and the hydraulic fracture efficiency can be obviously improved.

Description

Fracturing boring combined type method for sealing under coal mine
Technical field
The present invention relates to fracturing boring combined type method for sealing under a kind of coal mine, belong to fracturing correlative technology field under coal mine, be particularly useful for the sealing of hole problem of this coal seam hydraulic fracture boring under coal mine.
Background technology
Current, the essence method of control coal mine gas disaster is to carry out gas pumping, due to effect of natural environment, it is generally higher that content is deposited in China's coal-bed gas tax, high gas, low air permeability coal seam account for 70% left and right, extraction difficulty before exploitation is large, makes Gas Disaster become the principal element of restriction Safety of Coal Mine Production.The coal mine gas measure that effects a permanent cure is mainly to carry out gas pumping by boring.But, conventional gas pumping exist drilling hole amount many (each exploitation work plane needs hundreds of to thousands of borings) that the effective influence basin of boring little (spacing of wells 2 m left and right), region gas pumping need, drilling construction engineering quantity greatly, low (≤20 % of mash gas extraction concentration, even≤10 %), the problem such as extracting result is poor and the extraction time is long, can not adapt to the needs of safety in production.Along with coal-bed gas is administered carrying out in a deep going way of research work, hydraulic fracturing technology following that release is anti-reflection, firedamp drainage and change coal body physico-mechanical properties etc. under the prerequisite of principle, well solved that little, the drilling construction amount of boring influence basin is large, the poor problem of coal body gas permeability, improved gas pumping effect, at home a plurality of mine application obtained good effect.But in application process, also occurred a lot of problems, wherein, the sealing of hole of fracturing boring is exactly one of modal problem wherein.
The method for sealing that fracturing drilling and sealing is conventional has two kinds: metal tube adds cement mortar sealing of hole, capsule hole sealing of hole.It is mainly to adopt metal tube as hydraulic fracturing pipe that metal tube adds cement mortar sealing of hole, and hydraulic fracturing pipe is injected water cement mortar around, utilizes the cement mortar shutoff boring of solidifying.The method has the advantages such as raw material are easy to get, cheap, easy to operate, speed is fast, and cement mortar has certain plugging action to the crack of boring surrounding rock body, and compressive resistance is large, can meet the requirement of fracturing high sealability, high strength sealing of hole.The method is particularly useful for big-elevation or large angle of depression fracturing drilling and sealing.But metal tube adds the weak point of cement mortar sealing of hole to be: while using in coal seam, a large amount of metal tubes is left in coal body, for later stage back production hides some dangers for; And the general internal diameter of metal tube adopting is less, affects gas extraction flow.
Capsule hole sealing of hole is mainly by the cushion rubber on compression hole packer, causes that the expanded radially of cushion rubber realizes the object of borehole sealing, and capsule hole sealing of hole is generally applicable to rock stratum and grows fine and close boring.It is easy to operate, and generally capsule can reclaim.But because the method is for meeting sealing of hole effect, capsule diameter is generally larger, more difficultly when rib is rough send into boring, drilling quality is had relatively high expectations; While using capsule in coal seam, after fracturing, may can not get; In fracturing process, when capsule contacts out-of-flatness with drill hole wall, easily leak, cause pressure break failure; After fracturing finishes, take out after capsule, need to again to boring, carry out sealing of hole, so that mash gas extraction.
Summary of the invention
Technical problem: the object of the invention is to overcome the weak point existing in prior art, provide a kind of method simple, can realize that high pressure capsule recycling, sealing of hole are effective, fracturing boring combined type method for sealing under the coal mine that improves fracturing efficiency.
Technical scheme: fracturing boring combined type method for sealing under coal mine of the present invention, be included in the fracturing boring of constructing in coal seam, further comprising the steps of:
A. in the boring of the fracturing after construction completes, first send into pvc pipe two until desired location, then at pvc, manage caliber of two outer ends connections and manage two identical fusiformis pvc pipes with pvc, in fusiformis pvc pipe outer end, connect the pvc pipe one that caliber is identical with it again, afterwards, fusiformis pvc pipe and pvc pipe one are sent in fracturing boring, until pvc manages an exposed junction apart from 0.1m position, aperture;
B. in pvc pipe one and the space between fracturing boring wall, place Grouting Pipe, to managing two front end 2m and pvc apart from pvc in holing, manage one and with polyurethane, carry out shutoff respectively apart from 1m place, aperture;
C. by Grouting Pipe, to the space between pvc pipe one, fusiformis pvc pipe, pvc pipe two and fracturing boring wall, carry out conventional slip casting;
D. after slurries solidify completely, the high pressure capsule that is connected with high-pressure rubber pipe is set on pressure break pipe, by pressure break pipe, high pressure capsule is delivered to apart from 1m place, fusiformis pvc pipe inner side;
E. utilize force (forcing) pump and high-pressure rubber pipe that high pressure capsule is forced into valve-off after 8MPa, pressure break pipe is connected to fracturing equipment, carry out fracturing;
F., after fracturing finishes, open valve and make the complete release of high pressure capsule, and take out high pressure capsule;
G. after fracturing Drilling Water drains, pvc pipe one is connected with fire damp pipe network, carries out gas pumping.
The length of described fusiformis pvc pipe is 0.5-1m, and its external diameter is 75mm, and internal diameter is for being 52mm to middle part by the even gradual change of 60mm at two ends.
The length of described pvc pipe one is 2-4m.
Described pvc pipe one and the external diameter of pvc pipe two are 75mm, and internal diameter is 60mm.
Beneficial effect: owing to having adopted technique scheme, the present invention can avoid metal tube to stay in coal body, has increased later stage gas pumping pipe diameter, strengthened borehole sealing, having avoided leaking causes pressure break failure, and has simplified fracturing technique, the timely gas pumping of energy after fracturing; Borehole sealing is strong, and technique is simple, and without potential safety hazard, high pressure capsule can reuse, and reduces sealing of hole cost.In application, can significantly improve at the scene success rate and the gas pumping effect of fracturing.The rate of recovery of high pressure capsule is 100%, and sealing of hole cost adds cement mortar method for sealing compared with metal tube and reduces by 50%, compared with conventional capsule hole packer method for sealing cost 30%.Make gas extraction concentration improve 30% ~ 100%, gas flow improves 20% ~ 80%.There is in the art practicality widely.
Accompanying drawing explanation
Fig. 1 is fracturing boring combined type method for sealing schematic diagram under coal mine of the present invention;
Fig. 2 is fusiformis pvc tubular structure schematic diagram.
In figure: 1-1-pvc pipe one, 1-2-fusiformis pvc pipe, 1-3-pvc manages two, 2-high pressure capsule, 3-polyurethane, 4-Grouting Pipe, 5-high-pressure rubber pipe, 6-pressure break pipe, 7-force (forcing) pump, 8-valve, 9-fracturing boring, 10-pipe collar.
the specific embodiment:
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
Fracturing boring combined type method for sealing under coal mine of the present invention, concrete steps are as follows:
A. in coal seam, construct first according to a conventional method boring that an aperture is 113mm as fracturing boring 9, fracturing after construction the completes 9 interior external diameters of first sending into of holing are 75mm, internal diameter is that the pvc of 60mm manages two 1-3 until desired location, then in pvc pipe 1-3 outer end, connect a caliber and manage the identical fusiformis pvc pipe of two 1-3 1-2 with pvc, as shown in Figure 2, in fusiformis pvc pipe 1-2 outer end, connect the caliber pvc identical with it again and manage a 1-1, afterwards, fusiformis pvc pipe 1-2 and pvc are managed to a 1-1 to be sent in fracturing boring 9, until pvc manages a 1-1 exposed junction apart from 0.1m position, aperture, the length that pvc manages a 1-1 is 2-4m, the length of fusiformis pvc pipe 1-2 is 0.5-1m, its external diameter is 75mm, internal diameter is for being 52mm to middle part by the even gradual change of 60mm at two ends, the two ends of fusiformis pvc pipe 1-2 are managed a 1-1 and pvc through pipe collar 10 and pvc respectively and are managed two 1-3 and link together,
B. at pvc, manage the space that a 1-1 and fracturing hole between 9 walls and place Grouting Pipe 4, to managing two 1-3 front end 2m and pvc apart from pvc in holing, manage a 1-1 and with polyurethane 3, carry out shutoff respectively apart from 1m place, aperture;
C. by Grouting Pipe 4, to pvc, managing a 1-1, fusiformis pvc pipe 1-2, pvc manages the space that two 1-3 and fracturing hole between 9 walls and carries out conventional slip casting;
D. after slurries solidify completely, the high pressure capsule 2 that is connected with high-pressure rubber pipe 5 is set on pressure break pipe 6, by pressure break pipe 6, high pressure capsule 2 is delivered to apart from 1m place inside fusiformis pvc pipe 1-2, the external diameter of high pressure capsule 2 should be less than fusiformis pvc pipe 1-2 middle part minimum diameter;
E. utilize force (forcing) pump 7 and high-pressure rubber pipe 5 that high pressure capsule 2 is forced into valve-off 8 after 8MPa, now high pressure capsule 2 expands under the effect of press water, with pvc pipe close contact, seal the outlet of pvc pipe, by pressure break pipe 6 and fracturing equipment connection, carry out fracturing, when high pressure capsule 2 be subject to from boring in pressure time, fusiformis section to fusiformis pvc pipe 1-2 moves, and firmly seals the outlet of pvc pipe, guarantees fracturing safety, efficient;
F. after fracturing finishes, open valve 8 and make after the complete release of high pressure capsule 2, take out high pressure capsule 2;
G. when fracturing, hole after 9 water drain, pvc is managed to a 1-1 and be connected with fire damp pipe network, carry out gas pumping.

Claims (4)

1. a fracturing boring combined type method for sealing under coal mine, is included in the fracturing boring (9) of constructing in coal seam, it is characterized in that, further comprising the steps of:
A. in the boring of the fracturing after construction completes (9), first send into pvc pipe two (1-3) until desired location, then in pvc pipe two (1-3) outer end, connect the fusiformis pvc pipe (1-2) that a caliber is identical with pvc pipe two (1-3), in fusiformis pvc pipe (1-2) outer end, connect again pvc pipe one (1-1) that caliber is identical with it, afterwards, fusiformis pvc pipe (1-2) and pvc pipe one (1-1) are sent in fracturing boring (9), until pvc pipe one (1-1) exposed junction is apart from 0.1m position, aperture;
B. Grouting Pipe (4) is placed in the space between pvc pipe one (1-1) and fracturing boring (9) wall, to using respectively polyurethane (3) to carry out shutoff apart from pvc pipe two (1-3) front end 2m and pvc pipe one (1-1) apart from 1m place, aperture in holing;
C. by Grouting Pipe (4), to the space between pvc pipe one (1-1), fusiformis pvc pipe (1-2), pvc pipe two (1-3) and fracturing boring (9) wall, carry out conventional slip casting;
D. after slurries solidify completely, the high pressure capsule (2) that is connected with high-pressure rubber pipe (5) is set on to pressure break pipe (6) upper, by pressure break pipe (6), high pressure capsule (2) is delivered to apart from 1m place, fusiformis pvc pipe (1-2) inner side;
E. utilize force (forcing) pump (7) and high-pressure rubber pipe (5) that high pressure capsule (2) is forced into valve-off (8) after 8MPa, pressure break pipe (6) is connected to fracturing equipment, carry out fracturing;
F., after fracturing finishes, open valve (8) and make high pressure capsule (2) release completely, and take out high pressure capsule (2);
G. after fracturing boring (9) water drains, pvc pipe one (1-1) is connected with fire damp pipe network, carries out gas pumping.
2. under the coal mine requiring according to right 1, fracturing boring combined type method for sealing, is characterized in that: the length of described fusiformis pvc pipe (1-2) is 0.5-1m, and its external diameter is 75mm, internal diameter for the even gradual change of 60mm by two ends to middle part, be 52mm.
3. under the coal mine requiring according to right 1, fracturing boring combined type method for sealing, is characterized in that: the length of described pvc pipe one (1-1) is 2-4m.
4. fracturing boring combined type method for sealing under the coal mine requiring according to right 1, is characterized in that: described pvc pipe one (1-1) and the external diameter of pvc pipe two (1-3) are 75mm, and internal diameter is 60mm.
CN201310483101.4A 2013-10-16 2013-10-16 Method for sealing underground hydraulic fracture drilled hole of coal mine in combined manner Active CN103541679B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104594849A (en) * 2014-12-05 2015-05-06 新汶矿业集团有限责任公司华丰煤矿 Method for eliminating high ground stress
CN107191172A (en) * 2017-07-10 2017-09-22 河南理工大学 Sealing of hole, hydraulic fracturing and gas pumping integrative construction device and its construction method
CN110439497A (en) * 2019-07-31 2019-11-12 中国矿业大学 Drill multistage closure, fracturing, slip casting, water filling integration apparatus and application method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4300633A (en) * 1979-12-03 1981-11-17 Shell Oil Company Method of cementing wells with foam-containing cement
CN101581229A (en) * 2009-06-25 2009-11-18 抚顺矿业集团有限责任公司 Method for drilling and sealing holes through high-pressure water injection under coal mine
CN102287163A (en) * 2011-09-08 2011-12-21 重庆市能源投资集团科技有限责任公司 Drilling-sealing method and sealing device of coal mine underground ultrahigh pressure fracturing hole
CN102561989A (en) * 2012-02-21 2012-07-11 重庆市能源投资集团科技有限责任公司 Coal mine underground hydraulic fracturing hole sealing method
CN202544903U (en) * 2011-12-30 2012-11-21 杨春 Hole packer
CN202970767U (en) * 2012-12-26 2013-06-05 王爱国 Air bag plugging device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4300633A (en) * 1979-12-03 1981-11-17 Shell Oil Company Method of cementing wells with foam-containing cement
CN101581229A (en) * 2009-06-25 2009-11-18 抚顺矿业集团有限责任公司 Method for drilling and sealing holes through high-pressure water injection under coal mine
CN102287163A (en) * 2011-09-08 2011-12-21 重庆市能源投资集团科技有限责任公司 Drilling-sealing method and sealing device of coal mine underground ultrahigh pressure fracturing hole
CN202544903U (en) * 2011-12-30 2012-11-21 杨春 Hole packer
CN102561989A (en) * 2012-02-21 2012-07-11 重庆市能源投资集团科技有限责任公司 Coal mine underground hydraulic fracturing hole sealing method
CN202970767U (en) * 2012-12-26 2013-06-05 王爱国 Air bag plugging device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104594849A (en) * 2014-12-05 2015-05-06 新汶矿业集团有限责任公司华丰煤矿 Method for eliminating high ground stress
CN107191172A (en) * 2017-07-10 2017-09-22 河南理工大学 Sealing of hole, hydraulic fracturing and gas pumping integrative construction device and its construction method
CN110439497A (en) * 2019-07-31 2019-11-12 中国矿业大学 Drill multistage closure, fracturing, slip casting, water filling integration apparatus and application method

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Address after: 221116 No. 1 University Road, copper mountain, Jiangsu, Xuzhou

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