CN103541711B - Xuan Ding small-bore, coal-face termination hydraulic fracture control method - Google Patents

Xuan Ding small-bore, coal-face termination hydraulic fracture control method Download PDF

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Publication number
CN103541711B
CN103541711B CN201310494838.6A CN201310494838A CN103541711B CN 103541711 B CN103541711 B CN 103541711B CN 201310494838 A CN201310494838 A CN 201310494838A CN 103541711 B CN103541711 B CN 103541711B
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bore
small
coal
boring
hydraulic fracture
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CN201310494838.6A
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CN103541711A (en
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黄炳香
王友壮
马剑
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中国矿业大学
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Abstract

A kind of Xuan Ding small-bore, coal-face termination hydraulic fracture control method, holes along lane side anchor cable rig to top board construction small-bore fracturing in coal-face stope drift active workings termination.Should fill up the principle in goaf according to inbreak top board, broken swollen coefficient gets the coal-face mining height that empirical value determination drilling depth is 2 ~ 4 times; It is the fracture propagation distance of 1 ~ 2 times according to fracture propagation distance and in conjunction with the roadway support form determination spacing of wells.Then by small-bore high pressure sealing mounting pipe, small-bore hole packer is delivered to assigned address sealing of hole, use high-pressure pump to carry out high-pressure hydraulic fracturing to top board, transformation top board structure also weakens strength of roof.The uniformity of deep hole falling-back type fracturing technology ensuring fracture propagation can be adopted more than the fracturing hole of 4m for hole depth.The present invention is by anchor cable rig construction drill, and method is simple and convenient, workload is little, achieves the timely inbreak that coal-face termination hangs top, ensure that the safety in production of work plane.

Description

Xuan Ding small-bore, coal-face termination hydraulic fracture control method

Technical field

The present invention relates to a kind of hydraulic fracture method, especially a kind of hydraulic fracture method of hanging top for underground coal mine control coal-face termination.

Background technology

Coal-body Structure transformation is the core general character problem in science that the technical barrier such as tight roof, impulsion pressure, hypotonicity coal bed gas extraction, coal and gas prominent, top hard coal reduction in solution colliery relates to.By hydraulic fracture transformation roof rock mass structure, reach the timely inbreak controlling face roof, become one of key technology solving coal mining CONTROL OF STRATA MOVEMENT.

Because top board is hard in process of coal mining, although the most of top board in the middle part of goaf can be caving in time, in coal-face termination, due to the support of lane, stope drift active workings coal column side side, easily there is termination Xuan Ding.Termination hangs at most for hanging top form along the narrow major plate of tunnel trend, and area of suspension roof is generally greater than tens square metres.Hang top from pressure-controlled angle termination, ore deposit and generally can not impact destruction to work plane, but the toxic and harmful in goaf can be extruded suddenly goaf, clamp-oned coal-face when outstanding rostellum is so caving, cause work plane safety problem; Especially for highly gassy mine, the gas in goaf is clamp-oned coal-face suddenly, causes face gas to transfinite, and affects work plane safety, High-efficient Production.Meanwhile, termination hangs that rostellum is so disrumpent feelings to be caving, and the collision between inbreak sillar may produce spark, there is the potential safety hazard of induction goaf inner accumulated gas explosion.The goaf pernicious gas of coal-face mostly is CO and CH 4, explosive blasting control the outstanding top of termination easily cause secondary disaster and construct, complex management.Hydraulic fracture controls one of coal-face termination Xuan Ding technology becoming safe and feasible.

Summary of the invention

Technical problem: the present invention seeks to the application problem for existing in hydraulic fracture technology, provides a kind of small-bore hydraulic fracture method that simple, safe, efficient control coal-face termination hangs top.

Technical scheme: Xuan Ding small-bore, coal-face termination of the present invention hydraulic fracture method, comprises the following steps:

A. by coal-face mining height and the broken swollen coefficient determination drilling depth H of top board, a degree of depth of then constructing in coal-face termination is the boring of H, carries out hydraulic fracture, obtains fracture propagation distance, in conjunction with roadway support power, determines the spacing L that fracturing is holed;

B. anchor cable rig is used, according to the small-bore boring that drilling depth H, spacing of wells L are φ 28 ~ φ 40mm to a row or multi-row aperture of top board construction in stope drift active workings, first row boring aperture position distance lane, the stope drift active workings coal column side side 0 ~ 500mm in a row hole drilling of construction or many row hole drillings;

C. from the boring that distance coal-face is nearest, the set depth adopting high pressure sealing mounting pipe in small-bore small-bore hole packer to be delivered to small-bore boring carries out sealing of hole, then connect the fracturing device be made up of fracturing pipeline, pressure meter, stop valve and high-pressure pump at small-bore high pressure sealing mounting pipe exposed junction, successively hydraulic fracture is carried out to small-bore boring;

D. unlatching high-pressure pump and stop valve carry out hydraulic fracture to small-bore boring successively, and when pressure meter display water pressure is less than 1MPa, hydraulic fracture is complete, closes high-pressure pump and stop valve.

Described spacing of wells L is the fracture propagation distance of 1 ~ 2 times.

Described many row small-bore boring is 1-3 row, and the distance between array pitch is the fracture propagation distance of 0.5 ~ 1.5 times.

The drilling depth H of described small-bore boring is the coal-face mining height of 2 ~ 4 times.

Consistent or the depth length of the drilling depth H of the small-bore boring of described a row or multi-row boring is alternately arranged.

Beneficial effect: the present invention is according to the support system of coal-face termination top board and resistance to overturning feature, in conjunction with the fracture propagation rule of hydraulic fracture, determine to adopt the control thinking mainly cutting off the overall mechanical property of termination top board+reduction termination roof bolting body along tunnel side, form the method for designing that hydraulic fracture boring is arranged.Development and design is based on a complete set of equipment, particularly small-bore high pressure sealing mounting pipe of the small-bore boring hydraulic fracture of anchor cable rig and small-bore hole packer.The uniformity of deep hole falling-back type fracturing technology ensuring fracture propagation can be adopted more than the fracturing hole of 4m for hole depth.Should also can construct in roof of head face between work plane frame based on the small-bore hydraulic fracture method of anchor cable rig, for controlling the outstanding top in goaf in the middle part of work plane.The present invention adopt in coal-face stope drift active workings anchor cable rig construct a row or multi-row small-bore boring, by determining rational bore position, drilling depth and corresponding hydraulic fracture parameter, by anchor cable rig construction drill, with high-pressure pump, high-pressure hydraulic fracturing is carried out to top board, transformation top board structure also weakens strength of roof, control the timely inbreak of coal-face termination top board, ensure that the safety in production of coal-face.Its method is simple and convenient, workload is little.

Accompanying drawing explanation

Fig. 1 is embodiments of the invention one structural representations;

Fig. 2 a is embodiments of the invention two structural representations;

Fig. 2 b is the A-A view of Fig. 2 a;

Fig. 3 is the small-bore hole packer structural representation in the present invention;

Fig. 4 is the small-bore high pressure sealing mounting pipe structural representation in the present invention.

In figure: 1-stope drift active workings, 2-top board, hole in 3-small-bore, 4-small-bore hole packer, 5-small-bore high pressure sealing mounting pipe, 6-pressure meter, 7-stop valve, 8-fracturing pipeline, 9-high-pressure pump, 10-coal-face, 4-1-hole packer external screw joint, 4-2-one way valve, 5-1-external screw joint, 5-2-internal thread interface.

Detailed description of the invention

Below in conjunction with accompanying drawing, embodiments of the invention are further described:

Xuan Ding small-bore, coal-face termination of the present invention hydraulic fracture control method, first by coal-face mining height and the broken swollen coefficient determination drilling depth of top board; Obtain fracture propagation distance by pre-stage test, in conjunction with roadway support form, determine spacing of wells L, array pitch; Use anchor cable rig to construct on request the small-bore boring 3 that a row or multi-row aperture is φ 28 ~ φ 40mm to top board 2 in stope drift active workings 1, construct a row or multi-row in first row small-bore boring aperture position distance lane, stope drift active workings coal column side side 0 ~ 500mm; Described spacing of wells L is the fracture propagation distance of 1 ~ 2 times; Described many row small-bore boring 3 is 1-3 row, and the distance between array pitch is the fracture propagation distance of 0.5 ~ 1.5 times; The drilling depth H of described small-bore boring 3 is the coal-face mining height of 2 ~ 4 times.Consistent or the depth length of the drilling depth H of the small-bore boring 3 of a row or multi-row boring is alternately arranged, constructs to designated depth; By small-bore high pressure sealing mounting pipe 5, small-bore hole packer 4 is delivered to designated depth sealing of hole, the small-bore hole packer 4 that small-bore high pressure sealing mounting pipe 5 is connected is the hole packer of high pressure resistant 70MPa, aperture φ 28 ~ φ 40mm, is threaded connection and is connected with high pressure sealing mounting pipe.Small-bore high pressure sealing mounting pipe 5 is connected with fracturing pipeline 8, and fracturing pipeline 8 is connected with high-pressure pump 9, and pressure meter 6 and stop valve 7 are equipped with in aperture place; Unlatching high-pressure pump 9 and stop valve 7 are to boring hydraulic fracture, and when pressure meter 6 pressure is less than 1MPa, close high-pressure pump 9 and stop valve 7, this boring fracturing is complete; If drilling depth can be considered to use retrusive hydraulic fracture more than 8m.By small-bore high pressure sealing mounting pipe 5, small-bore hole packer 4 is installed to other boring one by one, to other hydraulic fracture one by one of holing, to all boring fracturings, whole work plane hydraulic fracture is complete.Can the larger distance of first advance first construct small-bore boring, but to small-bore boring hydraulic fracture must in lame advanced supporting section.Described small-bore boring 3 can construct beyond lame advanced supporting section, but to small-bore hole 3 carry out hydraulic fracture time should in the advanced strengthening supporting section in tunnel.

Embodiment one: as shown in Figure 1, certain coal mine work area coal seam average thickness 2.5m, seam inclination 0 ~ 5 o, immediate roof is Sandy Silt, average thickness 5.44m, and old top is siltstone, average thickness 12.54m.The head goaf, one or both ends at return aircourse place hangs top width and is about 6m, is about 20m, adopts the timely inbreak of hydraulic fracture control end crown plate.Small-bore boring 3 is arranged apart from the 200mm place construction one of lane, coal column side side in stope drift active workings, bore diameter 32mm, be 8m according to mining thickness determination drilling depth H, according to the fracture propagation distance that pre-stage test obtains, be 6m in conjunction with alley way anchor rete cord support form determination spacing of wells L, drilling construction, from advance support section, is constructed 20.By small-bore high pressure sealing mounting pipe 5, small-bore hole packer 4 is delivered to designated depth sealing of hole, small-bore high pressure sealing mounting pipe 5 is connected with fracturing pipeline 8, and fracturing pipeline 8 is connected with high-pressure pump 9, and pressure meter 6 and stop valve 7 are equipped with in aperture place.Unlatching high-pressure pump 9 and stop valve 7 are to a boring hydraulic fracture, and when pressure meter 6 pressure is less than 1MPa, close high-pressure pump 9 and stop valve 7, this boring fracturing is complete.Small-bore hole packer 4 is installed to other boring one by one, to other hydraulic fracture one by one of holing, until after all boring fracturings, hydraulic fracture is complete by small-bore high pressure sealing mounting pipe 5.

Embodiment two: as shown in Fig. 2 a, Fig. 2 b, certain coal mine work area coal seam average thickness 2.9m, seam inclination average 6 o, immediate roof is medium sandstone, average thickness 1.8m, and old top is Sandy Silt, average thickness 30m.The head goaf, one or both ends at return aircourse place hangs top width and is about 5m, is about 15m, adopts the timely inbreak of hydraulic fracture control end crown plate.In stope drift active workings, be respectively 200mm, 4200mm place construction two apart from lane, coal column side side arrange small-bore boring 3, according to mining thickness determination drilling depth H, drilling depth H is respectively 11m and the 6m depth and alternately arranges, according to the fracture propagation distance that pre-stage test obtains, be 5m in conjunction with alley way anchor rete cord support form determination spacing of wells L, drilling construction, from advance support section, is constructed 40.By small-bore high pressure sealing mounting pipe 5, small-bore hole packer 4 is delivered to designated depth sealing of hole, small-bore high pressure sealing mounting pipe 5 is connected with fracturing pipeline 8, and fracturing pipeline 8 is connected with high-pressure pump 9, and pressure meter 6 and stop valve 7 are equipped with in aperture place.Unlatching high-pressure pump 9 and stop valve 7 are to a boring hydraulic fracture, and when pressure meter 6 pressure is less than 1MPa, close high-pressure pump 9 and stop valve 7, this boring fracturing is complete.By small-bore high pressure sealing mounting pipe 5, small-bore hole packer 4 is installed to other boring one by one, to other hydraulic fracture one by one of holing, to all boring fracturings, hydraulic fracture is complete.

Claims (5)

1. a coal-face termination Xuan Ding small-bore hydraulic fracture method, is characterized in that comprising the following steps:
A. by coal-face mining height and the broken swollen coefficient determination drilling depth H of top board, then a degree of depth of constructing in coal-face termination is the boring of H, carries out hydraulic fracture, obtains fracture propagation distance, in conjunction with roadway support power, determine spacing L, array pitch that fracturing is holed;
B. anchor cable rig is used, be small-bore boring (3) of φ 28 ~ φ 40mm to top board (2) a row or multi-row aperture of constructing according to drilling depth H, spacing of wells L in stope drift active workings (1), first row boring aperture position distance lane, stope drift active workings (1) the coal column side side 0 ~ 500mm in a row hole drilling of construction or many row hole drillings;
C. from the boring that distance coal-face is nearest, the set depth adopting small-bore high pressure sealing mounting pipe (5) small-bore hole packer (4) to be delivered to small-bore boring (3) carries out sealing of hole, the hole packer that the small-bore hole packer (4) that small-bore high pressure sealing mounting pipe (5) is connected is high pressure resistant 70MPa, aperture is φ 28 ~ φ 40mm, is threaded connection and is connected with high pressure sealing mounting pipe; Then connect the fracturing device be made up of fracturing pipeline (8), pressure meter (6), stop valve (7) and high-pressure pump (9) at small-bore high pressure sealing mounting pipe (5) exposed junction, successively hydraulic fracture is carried out to small-bore boring;
D. open high-pressure pump (9) and stop valve (7) and carry out hydraulic fracture to small-bore boring (3) successively, when pressure meter (6) display water pressure is less than 1MPa, hydraulic fracture is complete, and close high-pressure pump (9) and stop valve (7), this boring fracturing is complete; By small-bore high pressure sealing mounting pipe (5), small-bore hole packer (4) is installed to other boring one by one, carries out hydraulic fracture one by one to other boring, to all boring fracturings, whole work plane hydraulic fracture is complete; If drilling depth is more than 8m, then consider to use retrusive hydraulic fracture.
2. Xuan Ding small-bore, coal-face termination according to claim 1 hydraulic fracture method, is characterized in that: described spacing of wells L is the fracture propagation distance of 1 ~ 2 times.
3. Xuan Ding small-bore, coal-face termination according to claim 1 hydraulic fracture method, is characterized in that: described many rows small-bore boring (3) are 2-3 row, and the distance between array pitch is the fracture propagation distance of 0.5 ~ 1.5 times.
4. Xuan Ding small-bore, coal-face termination according to claim 1 hydraulic fracture method, is characterized in that: the drilling depth H of described small-bore boring (3) is the coal-face mining height of 2 ~ 4 times.
5. Xuan Ding small-bore, the coal-face termination hydraulic fracture method according to claim 1 or 4, is characterized in that: the consistent or depth length of the drilling depth H of the small-bore of described a row or multi-row boring boring (3) is alternately arranged.
CN201310494838.6A 2013-10-21 2013-10-21 Xuan Ding small-bore, coal-face termination hydraulic fracture control method CN103541711B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101509395A (en) * 2009-03-16 2009-08-19 太原理工大学 The roof caving and tunnel protecting method
CN102182499A (en) * 2011-04-21 2011-09-14 中国矿业大学 Hydrofracturing-based method and equipment for diminishing dust and eliminating outburst of coal bed
CN102654049A (en) * 2012-05-28 2012-09-05 中国矿业大学 Porous linear control hydraulic fracturing method
RU2460875C1 (en) * 2011-05-31 2012-09-10 Открытое акционерное общество "Татнефть" имени В.Д. Шашина Carbonate formation hydraulic fracturing method
CN102797448A (en) * 2012-08-31 2012-11-28 中国矿业大学 Retreating sectional type hydraulic cracking method
CN103061732A (en) * 2012-12-20 2013-04-24 大同煤矿集团有限责任公司 Hydraulic fracturing method of 2-3 meter hard medium sandstone stratum of roof of coal seam

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101509395A (en) * 2009-03-16 2009-08-19 太原理工大学 The roof caving and tunnel protecting method
CN102182499A (en) * 2011-04-21 2011-09-14 中国矿业大学 Hydrofracturing-based method and equipment for diminishing dust and eliminating outburst of coal bed
RU2460875C1 (en) * 2011-05-31 2012-09-10 Открытое акционерное общество "Татнефть" имени В.Д. Шашина Carbonate formation hydraulic fracturing method
CN102654049A (en) * 2012-05-28 2012-09-05 中国矿业大学 Porous linear control hydraulic fracturing method
CN102797448A (en) * 2012-08-31 2012-11-28 中国矿业大学 Retreating sectional type hydraulic cracking method
CN103061732A (en) * 2012-12-20 2013-04-24 大同煤矿集团有限责任公司 Hydraulic fracturing method of 2-3 meter hard medium sandstone stratum of roof of coal seam

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