CN106285681A - A kind of hard coal seam top board fracturing device and method - Google Patents

A kind of hard coal seam top board fracturing device and method Download PDF

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Publication number
CN106285681A
CN106285681A CN201610997771.1A CN201610997771A CN106285681A CN 106285681 A CN106285681 A CN 106285681A CN 201610997771 A CN201610997771 A CN 201610997771A CN 106285681 A CN106285681 A CN 106285681A
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fracturing
boring
water
water injection
injection pipe
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CN106285681B (en
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翟成
徐吉钊
秦雷
于国卿
孙勇
董若蔚
武尚俭
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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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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C41/00Methods of underground or surface mining; Layouts therefor
    • E21C41/16Methods of underground mining; Layouts therefor
    • E21C41/18Methods of underground mining; Layouts therefor for brown or hard coal

Abstract

A kind of hard coal seam top board fracturing device and method, be primarily adapted for use in that hardness is big, intensity is high and the goaf tight roof fracturing of compact structure.First holing to set depth to tight roof construction fracturing boring and monitoring, the fracturing boring using super pressure hole packer to seal at the water injection pipe feeding two ends of external fixed point fracturing device is interior.Press water that frequency the is 6Hz outlet in fixed point fracturing device is uniformly mixed into serosity with static breaking agent, if device for detecting temperature monitors temperature when rising, stops water filling;When being down to initial temperature at a temperature of when, carry out pulsed hydraulic fracturing operation, rely on " water attack " and " water wedge " effect of different frequency press water, make the zone of action, rock stratum produce the damage of accumulation alternation.Dynamically in fracturing process, the monitoring fracturing boring manometric numerical fluctuations of external connected electronic in real time, if pressure value there are flowing out in being greatly reduced and monitor boring, stop fracturing work.The method low cost, simple to operate, top board fracturing efficiency can be effectively improved.

Description

A kind of hard coal seam top board fracturing device and method
Technical field
The present invention relates to a kind of hard coal seam top board fracturing device and method, especially one are applicable to that hardness is big, intensity Height and the goaf tight roof fracturing of compact structure.
Background technology
Along with work surface is constantly pushed ahead, top board length is left in goaf and area of suspension roof continues to increase, the most easily Cause gas local accumulation, and can be by overlying rock and the impulsion pressure of remote formation, it is easy to induction top board collapses and emits thing Therefore, it is therefore desirable to goaf top plate is carried out fracturing in advance so that it is purposively be caving and be deposited in goaf, subtract Few methane accumulation and the generation of roof accident.Usually, directly top intensity relies on rock stratum deadweight to be caving time relatively low, works as top board When rock strength is bigger, generally use the mode such as high-pressure hydraulic pressure break or deep hole blasting overhead caving.
But, tradition caving mode also exists certain defective, and such as, high-pressure hydraulic pressure break is required to provide big stream The water injection equipment of amount water under high pressure, usual this kind of equipment volume is huge, is difficult to carry out the work in goaf, it addition, to boring Sealing requirements the highest, it is difficult to ensure that the seriality of bore inner water under high pressure, the most simple high-pressure hydraulic fracturing process is not Can the propagation direction in keyhole crack;Deep hole blasting then needs to fill substantial amounts of high explosives, easily in bore inner shape Become stronger shock wave, bigger stress disturbance is caused in internal rock stratum, there is the potential safety hazard of induction dynamic disaster, and the most right The destructiveness of boring country rock around is relatively big, is difficult to realize orientation fracturing.If additionally, tight roof mining height is bigger and top board is pre- Time in the range of fracturing without lamination, tradition overhead caving mode fracturing direction controllability is poor.Therefore, for above-mentioned existence Problem, needs top board fracturing device and the method for a kind of new type of safe badly, high efficiency can not only weaken tight roof rock strength, And ensure that increase crushing rock formation degree, the appearance of preventing and treating bump.
Summary of the invention
Technical problem: it is an object of the invention to the weak point overcome existing for prior art, it is provided that a kind of easy and simple to handle, Low cost, effect preferable hard coal seam top board fracturing device and method.
Technical scheme: the hard coal seam top board fracturing device of the present invention, including the water injection pipe stretched in fracturing boring, water filling It is interval with multiple fixed point fracturing device on pipe, is respectively equipped with super pressure hole packer inside and outside water injection pipe, outside fracturing boring Portion is provided with dynamically pulsation fracturing device and device for detecting temperature;
Described dynamically pulsation fracturing device includes electronic pressure gage, water filling flexible pipe, overflow valve, sebific duct, converter, pulsation Water injecting pump and water storage tank, electronic pressure gage is installed in the port position that water injection pipe is connected, outside water filling flexible pipe one end is with water injection pipe Dew end is connected, and sebific duct is coupled together by the other end by overflow valve, and sebific duct is respectively communicated to water storage tank and pulsed infusion pump, pulsation Water injecting pump is connected with converter by cable;
Described device for detecting temperature includes wire, signal integrator and temperature collection control station, one end of wire and cause The wire splitting boring interior thermocouple extraction is connected, and the other end is connected with signal integrator, and signal integrator controls with temperature collection Platform is connected.
Described water filling flexible pipe is provided with one-way cock.
Described fixed point fracturing device includes the floral tube with slot, pipe collar floral tube and water injection pipe being connected as a single entity, flower The centre of pipe is provided with the gauze bag of static breaking agent powder, and the outside of gauze bag is provided with the chuck of thermocouple.
Use the hard coal seam top board fracturing method of said apparatus, comprise the steps:
A. in tight roof, construction fracturing is holed and monitoring boring is to set depth respectively to utilize rig;
B. conveying fixed point fracturing device in fracturing is holed, first passes super pressure hole packer by the water injection pipe that one end is closed, Then on water injection pipe, the multiple fixed point fracturing devices of spacing distance connection are sent in fracturing boring in the lump, multiple fixed points are caused respectively The thermocouple wire split on device causes outside boring along water injection pipe, in distance fracturing boring 3m position, utilizes super resistance to press seal Fracturing boring is sealed by hole device;
C. the aperture in fracturing boring arranges dynamically pulsation fracturing device and device for detecting temperature, record fixed point fracturing device The hole wall temperature of middle card disk area is T0
D. start pulsed infusion pump, regulation converter by press water that frequency is 6Hz through overflow valve → water filling flexible pipe → mono- To valve → water injection pipe → fixed point fracturing device, it flow in fracturing device equipped with in the gauze bag of static breaking agent, in pulsation Under the reciprocating impact effect of press water, water is sufficiently mixed into serosity with the static breaking agent in gauze bag, and serosity seepage flow is to chuck And the region between fracturing borehole wall;
E. louver wall temperature T of card disk area in temperature collection control station record slurry reaction exothermic process is utilized, if T >T0And when persistently rising, close pulsed infusion pump;
F. persistently reduce and level off to T as T0Time, start pulsed infusion pump, the pressure of lasting pulsed infusion to electronic pressure gage After force value rises, regulating converter, water injection frequency is alternate between 6Hz~20Hz;Continue to be filled to electronic pressure gage number Being greatly lowered occurs in value, and closes converter, keeps pressure to carry out water filling, when the water with white crystal grain is flowed out in monitoring boring Time, coupling fracturing terminates.
The boring of described fracturing and monitoring boring are at a distance of 5-10m.
Described fracturing device is added with in the static breaking agent powder in gauze bag the inertia white sand grains of insoluble in water, grain Footpath scope is 40~60 mesh, and compressive resistance is 50~60MPa.
The thermocouple model selected in described chuck is K-type, and sensitivity is 0.5 DEG C, and temperature detection range is 10~150 DEG C, can bear maximum pressure is 5MPa.
Beneficial effect: owing to have employed technique scheme, the present invention is by by the crack high density of stable state fracturing and arteries and veins The advantages such as the tired fracturing of dynamic fracturing combine, and then solve the serial difficult problem that tradition overhead caving mode exists.The One step relies on static breaking agent reaction, is elongated the explosion time of tradition crack explosive moment so that rock stratum produces fatigue damage, Farthest reduce ABNORMAL STRESS disturbance.Rely on the strong expansive force squeezing action of static breaking agent simultaneously, make rock near boring Layer is effectively formed fixed point fracture area, substantially reduces the shock wave effect to rock stratum around.Fluctuation pressure water is filled by second step Completely pinpoint the crack of fracture area, according to certain frequency, rock stratum is carried out reversed fatigue loading, make internal generation of roof strata accumulate Fatigue damage, finally make crack further expand the formation plane of disruption, efficiently solve roof strata fixed point segmentation weaken, Increase roof strata fracture controllability and degree of fragmentation.Achieve stable state fracturing technology and pulsed hydraulic fracturing technology couples cause Split, thus improve roof flaking ratio, it is to avoid top board large area is across falling to causing hurricane accident.Its simple in construction, method is easy, uses Effective, there is wide applicability in the art.
Accompanying drawing explanation
Fig. 1 is hard coal seam top board fracturing device and the embodiment schematic diagram of method of the present invention;
Fig. 2 is fixed point fracturing device schematic diagram in Fig. 1;
Fig. 3 is dynamically pulse in Fig. 1 fracturing device and device for detecting temperature schematic diagram.
In figure: 1-fracturing is holed, and 2-monitors boring, the super pressure hole packer of 3-, and 4-pinpoints fracturing device, 4-1-pipe collar, 4- 2-chuck, 4-3-gauze bag, 4-4-slot, 4-5-floral tube, 5-water injection pipe, 6-one-way cock, 7-electronic pressure gage, 8-notes Water tube hose, 9-overflow valve, 10-sebific duct, 11-converter, 12-pulsed infusion pump, 13-water storage tank, 14-wire, 15-signal is integrated Device, 16-temperature collection control station, 17-tight roof, A-dynamically pulses fracturing device, B-device for detecting temperature.
Detailed description of the invention
Below in conjunction with the accompanying drawings one embodiment of the present of invention is further described:
As it is shown in figure 1, the hard coal seam top board fracturing device of the present invention, including the water injection pipe 5 stretched in fracturing boring 1, It is interval with multiple fixed point fracturing device 4 on water injection pipe 5, inside and outside water injection pipe 5, is respectively equipped with super pressure hole packer 3, cause Split boring 1 outside and be provided with dynamically pulsation fracturing device A and device for detecting temperature B;Described fixed point fracturing device 4 includes carrying seamed The floral tube 4-5 of groove 4-4, the pipe collar 4-1 being connected as a single entity with water injection pipe 5 by floral tube 4-5, the centre of floral tube 4-5 are provided with static broken The gauze bag 4-3 of broken dose of powder, the outside of gauze bag 4-3 is provided with the chuck 4-2 of thermocouple.Described fracturing device of dynamically pulsing A includes electronic pressure gage 7, water filling flexible pipe 8, overflow valve 9, sebific duct 10, converter 11, pulsed infusion pump 12 and water storage tank 13, electricity Sub-Pressure gauge 7 is installed in the port position that water injection pipe 5 is connected, and described water filling flexible pipe 8 is provided with one-way cock 6;Water filling is soft Pipe 8 one end is connected with water injection pipe 5 exposed junction, and sebific duct 10 is coupled together by the other end by overflow valve 9, and sebific duct 10 is respectively communicated to Water storage tank 13 and pulsed infusion pump 12, pulsed infusion pump 12 is connected with converter 11 by cable;Described device for detecting temperature B Including wire 14, signal integrator 15 and temperature collection control station 16, one end of wire 14 is drawn with thermocouple in fracturing boring 1 Wire be connected, the other end is connected with signal integrator 15, and signal integrator 15 is connected with temperature collection control station 16.
The hard coal seam top board fracturing method of the present invention, specifically comprises the following steps that
A. utilize rig to construct fracturing boring 1 in tight roof 17 respectively and monitor boring 2 to set depth;Described cause Split boring 1 and monitoring boring 2 at a distance of 5-10m;
B. conveying fixed point fracturing device 4 in fracturing boring 1, the water injection pipe 5 first closed one end is through super pressure sealing of hole Device 3, is coupled together water injection pipe long for specific joint by pipe collar 4-1, fixes fixed point fracturing device 4 at a certain distance and has The chuck 4-2 of thermocouple, makes spacing distance on water injection pipe 5 connect multiple fixed point fracturing devices 4 and sends in fracturing boring 1 in the lump, Respectively the thermocouple wire 14 on multiple fixed point fracturing devices 4 is caused outside boring along water injection pipe 5, in distance fracturing boring 1 3m position, utilize super pressure hole packer 3 that fracturing boring 1 is sealed;
C., after, dynamically pulsation fracturing device A and device for detecting temperature B is connected respectively in the aperture of fracturing boring 1, dynamically Pulsation fracturing device A connection mainly shows themselves in that electronic pressure gage 7 is installed in the port position that water injection pipe 5 is connected, water filling flexible pipe 8 one end are connected with water injection pipe 5 exposed junction, and sebific duct 10 is coupled together by the other end by overflow valve 9, and sebific duct 10 is respectively communicated to storage Water tank 13 and pulsed infusion pump 12, pulsed infusion pump 12 is connected with converter 11 by cable;Device for detecting temperature B connects main Showing themselves in that the wire 14 that one end of wire is drawn with thermocouple in fracturing boring is connected, the other end is connected with signal integrator 15, Signal integrator 15 is connected with temperature collection control station 16, and in record fixed point fracturing device 4, the hole wall temperature in chuck 4-2 region is T0
D. start pulsed infusion pump 12, regulation converter 11 by press water that frequency is 6Hz through overflow valve 9 → water filling flexible pipe 8 → one-way cock, 6 → water injection pipe, 5 → fixed point fracturing device 4, flow to the gauze bag equipped with static breaking agent in fracturing device 4 In 4-3, under the reciprocating impact effect of fluctuation pressure water, water is sufficiently mixed into serosity with the static breaking agent in gauze bag 4-3, Serosity seepage flow is to the region between chuck 4-2 and fracturing borehole wall;In described fracturing device 4, the static state in gauze bag 4-3 is broken Being added with the inertia white sand grains of insoluble in water in broken dose of powder, particle size range is 40~60 mesh, and compressive resistance is 50~60MPa; The thermocouple model selected in described chuck 4-2 is K-type, and sensitivity is 0.5 DEG C, and temperature detection range is 10~150 DEG C, can Bearing maximum pressure is 5MPa;
E. temperature collection control station 16 is utilized to record the louver wall temperature in chuck 4-2 region in slurry reaction exothermic process T, if T > T0And when persistently rising, close pulsed infusion pump 12;
F. persistently reduce and level off to T as T0Time, start pulsed infusion pump 12, continue pulsed infusion to electronic pressure gage 7 Force value rise after, regulate converter 11, water injection frequency is alternate between 6Hz~20Hz;Sustained water injection is to electronics pressure Being greatly lowered occurs in power table 7 numerical value, and closes converter 11, keeps pressure to carry out water filling, when monitoring boring 2 outflow is with white During the water of crystal grain, coupling fracturing terminates.

Claims (7)

1. a hard coal seam top board fracturing device, it is characterised in that: it includes stretching into the water injection pipe (5) in fracturing boring (1), It is interval with multiple fixed point fracturing device (4) on water injection pipe (5), inside and outside water injection pipe (5), is respectively equipped with super pressure sealing of hole Device (3), fracturing boring (1) is outside is provided with fracturing device of dynamically pulsing (A) and device for detecting temperature (B);
Described fracturing device of dynamically pulsing (A) includes electronic pressure gage (7), water filling flexible pipe (8), overflow valve (9), sebific duct (10), converter (11), pulsed infusion pump (12) and water storage tank (13), electronic pressure gage (7) is installed in water injection pipe (5) and is connected Port position, water filling flexible pipe (8) one end is connected with water injection pipe (5) exposed junction, the other end by overflow valve (9) by sebific duct (10) Coupling together, sebific duct (10) is respectively communicated to water storage tank (13) and pulsed infusion pump (12), and pulsed infusion pump (12) passes through cable It is connected with converter (11);
Described device for detecting temperature (B) includes wire (14), signal integrator (15) and temperature collection control station (16), wire (14) wire that one end is drawn with fracturing boring (1) interior thermocouple is connected, and the other end is connected with signal integrator (15), signal Integrator (15) is connected with temperature collection control station (16).
A kind of hard coal seam top board fracturing device the most according to claim 1, it is characterised in that: described water filling flexible pipe (8) one-way cock (6) it is provided with.
A kind of hard coal seam top board fracturing device the most according to claim 1, it is characterised in that: described fixed point fracturing dress Put (4) include the floral tube (4-5) with slot (4-4), the pipe collar (4-1) that floral tube (4-5) and water injection pipe (5) are connected as a single entity, The centre of floral tube (4-5) is provided with the gauze bag (4-3) of static breaking agent powder, and the outside of gauze bag (4-3) is provided with thermocouple Chuck (4-2).
4. the hard coal seam top board fracturing method using device described in claim 1,2 or 3, it is characterised in that: include as Lower step:
A. in tight roof (17), construction fracturing is holed (1) and monitoring boring (2) is to set depth respectively to utilize rig;
B. conveying fixed point fracturing device (4) in fracturing boring (1), the water injection pipe (5) first closed one end is through super resistance to press seal Hole device (3), then connects multiple fixed point fracturing devices (4) at the upper spacing distance of water injection pipe (5) and sends into fracturing boring (1) in the lump In, respectively the thermocouple wire (14) on multiple fixed point fracturing devices (4) is caused outside boring, in distance along water injection pipe (5) Fracturing boring (1) 3m position, utilizes super pressure hole packer (3) to seal fracturing boring (1);
C. the aperture in fracturing boring (1) arranges fracturing device of dynamically pulsing (A) and device for detecting temperature (B), and record fixed point causes Splitting the hole wall temperature in chuck (4-2) region in device (4) is T0
D. starting pulsed infusion pump (12), regulation converter (11) is by soft through overflow valve (9) → water filling for the press water that frequency is 6Hz Pipe (8) → one-way cock (6) → water injection pipe (5) → fixed point fracturing device (4), flow in fracturing device (4) break equipped with static state In the gauze bag (4-3) of broken dose, under the reciprocating impact effect of fluctuation pressure water, water and the static crushing in gauze bag (4-3) Agent is sufficiently mixed into serosity, the region between serosity seepage flow to chuck (4-2) and fracturing borehole wall;
E. the louver wall temperature in chuck (4-2) region in temperature collection control station (16) record slurry reaction exothermic process is utilized T, if T > T0And when persistently rising, close pulsed infusion pump (12);
F. persistently reduce and level off to T as T0Time, start pulsed infusion pump (12), continue pulsed infusion to electronic pressure gage (7) After force value rises, regulation converter (11), water injection frequency is alternate between 6Hz~20Hz;Continue to be filled to electronics pressure Being greatly lowered occurs in power table (7) numerical value, and closes converter (11), keeps pressure to carry out water filling, when monitoring boring (2) elution band When having the water of white crystal grain, coupling fracturing terminates.
A kind of hard coal seam top board fracturing method the most according to claim 4, it is characterised in that: described fracturing boring (1) With monitoring boring (2) at a distance of 5-10m.
A kind of hard coal seam top board fracturing method the most according to claim 4, it is characterised in that: described fracturing device (4) Being added with the inertia white sand grains of insoluble in water in static breaking agent powder in middle gauze bag (4-3), particle size range is 40~60 Mesh, compressive resistance is 50~60MPa.
A kind of hard coal seam top board fracturing method the most according to claim 4, it is characterised in that: described chuck (4-2) The thermocouple model of interior selection is K-type, and sensitivity is 0.5 DEG C, and temperature detection range is 10~150 DEG C, can bear maximum pressure For 5MPa.
CN201610997771.1A 2016-11-11 2016-11-11 A kind of hard coal seam top plate fracturing device and method Active CN106285681B (en)

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Cited By (8)

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CN108756883A (en) * 2018-06-11 2018-11-06 陕西煤业化工技术研究院有限责任公司 A kind of coal mine tight roof slip casting fracturing process and system
CN109372510A (en) * 2018-11-26 2019-02-22 武汉工程大学 A kind of method of carbon dioxide and water fluid-mixing pressure break limestone roof
CN109441421A (en) * 2018-11-16 2019-03-08 中国海洋石油集团有限公司 A method of strengthening waterpower percussive pressure and splits fracturing effect
CN109538209A (en) * 2018-09-11 2019-03-29 中国矿业大学 A kind of reduction coal seam tight roof method based on electroporation
CN110173247A (en) * 2019-05-19 2019-08-27 中铁十九局集团矿业投资有限公司 A kind of Roof Control fracturing process of soft broken top plate ore body back production
CN110208087A (en) * 2019-06-05 2019-09-06 东北石油大学 Rock strength calculation method under pressure break cyclic loading of pulsing
CN111236907A (en) * 2019-12-20 2020-06-05 中国矿业大学 Liquid nitrogen circulating cold shock permeability increasing method based on multi-parameter monitoring
CN111255454A (en) * 2020-01-17 2020-06-09 天地科技股份有限公司 Method for directional roof cutting and pressure relief of hard roof of coal mine

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CN105971660A (en) * 2016-05-05 2016-09-28 中国矿业大学 Ultrasonic cavitation and hydrofracture combined stimulation coalbed methane extraction method

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CN105134284A (en) * 2015-08-03 2015-12-09 中国矿业大学 Gas extraction method based on horizontal orientation boring liquid nitrogen cycle freeze-thaw anti-reflection
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CN108756883A (en) * 2018-06-11 2018-11-06 陕西煤业化工技术研究院有限责任公司 A kind of coal mine tight roof slip casting fracturing process and system
CN109538209A (en) * 2018-09-11 2019-03-29 中国矿业大学 A kind of reduction coal seam tight roof method based on electroporation
CN109441421A (en) * 2018-11-16 2019-03-08 中国海洋石油集团有限公司 A method of strengthening waterpower percussive pressure and splits fracturing effect
CN109441421B (en) * 2018-11-16 2021-05-14 中国海洋石油集团有限公司 Method for enhancing hydraulic impact fracturing effect
CN109372510A (en) * 2018-11-26 2019-02-22 武汉工程大学 A kind of method of carbon dioxide and water fluid-mixing pressure break limestone roof
CN110173247A (en) * 2019-05-19 2019-08-27 中铁十九局集团矿业投资有限公司 A kind of Roof Control fracturing process of soft broken top plate ore body back production
CN110208087A (en) * 2019-06-05 2019-09-06 东北石油大学 Rock strength calculation method under pressure break cyclic loading of pulsing
CN110208087B (en) * 2019-06-05 2020-01-07 东北石油大学 Rock strength calculation method under pulsating fracturing cyclic load
CN111236907A (en) * 2019-12-20 2020-06-05 中国矿业大学 Liquid nitrogen circulating cold shock permeability increasing method based on multi-parameter monitoring
CN111236907B (en) * 2019-12-20 2021-04-30 中国矿业大学 Liquid nitrogen circulating cold shock permeability increasing method based on multi-parameter monitoring
CN111255454A (en) * 2020-01-17 2020-06-09 天地科技股份有限公司 Method for directional roof cutting and pressure relief of hard roof of coal mine

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