CN103742115A - Underground coal mine fracture sealing device and method - Google Patents
Underground coal mine fracture sealing device and method Download PDFInfo
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- CN103742115A CN103742115A CN201310700190.3A CN201310700190A CN103742115A CN 103742115 A CN103742115 A CN 103742115A CN 201310700190 A CN201310700190 A CN 201310700190A CN 103742115 A CN103742115 A CN 103742115A
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Abstract
The invention provides an underground coal mine fracture sealing device and method. The underground coal mine fracture sealing device comprises a water injection pipe, a thick liquid return pipe, a front polyurethane hole sealing section, a back polyurethane hole sealing section, a safety valve, an umbrella type supporting device assembly and a thick liquid injection pipe. The umbrella type supporting device assembly is composed of an umbrella supporting frame, a supporting pipe, a sliding hoop, a piston rod and a piston, and a guide rail groove and the safety valve are arranged on the supporting pipe. When being fed into a drill hole, the umbrella type sealing device shrinks, and then the device is conveniently fed into the drill hole. When high-pressure water of which the initial injection pressure is 5MPa is injected, the umbrella type supporting device is opened, the piston is pushed forwards, the umbrella type supporting frame is unfolded and penetrates into coal, the high-pressure water continuously squeezes the hole sealing sections, and then the umbrella type supporting frame penetrates into the coal deeper and deeper. When the water injection pressure is increased to be larger than or equal to 15MPa, pressure water breaks through the safety valve to carry out fracturing operation on the drill hole, and therefore pressure loading capacity of the hole sealing sections is greatly improved, water injection pressure is increased, and the fracturing effect is improved. The underground coal mine fracture sealing device is simple in structure, easy to operate, high in pressure loading capacity, and good in sealing effect.
Description
Technical field
The present invention relates to a kind of borehole sealing device and method, especially a kind of sealing device and method that is applicable to coal mine underground fracturing.
Background technology
China Mine Geological complicated condition, high gas layer accounts for 50～70%, and high gassy and low permeability coal seam accounts for 70% left and right wherein.A large amount of Gas are often followed in the exploitation of high gassy and low permeability coal seam, particularly along with the high-efficiency intensifying of coal production and the increase of mining depth, gas emission is increasing, the threat of gas explosion and Gas Outburst danger is also increasing, and Gas Disaster has become the greatest factor of the intensive production technique development of restriction colleges and universities and safety in production.Therefore, how to solve the Gas problem in high gas layer recovery process, Safety of Coal Mine Production tool is of great significance.
In order to carry out mine gas prevention and control, a difficult problem for the gas permeability that how to improve low air permeability coal seam that first will solve.For this reason, it is anti-reflection that colliery often adopts the technology such as the fracturing of underground coal floor height, deep space loosening blasting to carry out pressure release to coal body, these technology all need to be holed in coal seam, by the energy that injects water under high pressure or explosive charge generation, make coal body produce crack, improve gas permeability of coal seam.One of them technical barrier high pressure sealing problem of holing exactly, as coal seam implemented to high fracturing, in order to form effective Fracture Networks in coal body inside, for the coal seam of buried depth 1000m, the sealability of boring need to be born hydraulic pressure more than 30MPa, otherwise boring occurs leaking and affects fracturing effect.In order to guarantee quality and the pressure break success rate of fracturing, exploitation high pressure borehole sealing equipment becomes the task of top priority.
Summary of the invention
Technical problem: the object of the invention is to overcome the weak point in prior art, provide a kind of simple in structure, bearing capacity is high, the coal mine underground fracturing sealing device of good sealing effect.
Technical scheme: coal mine underground fracturing sealing device of the present invention, comprise through polyurethane sealing of hole section and be fixed on the water injection pipe in boring, return pipe and Grouting Pipe, wherein, water injection pipe is through front and back polyurethane sealing of hole section, return pipe and Grouting Pipe enter in the space being formed by front and back polyurethane sealing of hole section shutoff and boring, the return pipe that enters shutoff space is longer than the Grouting Pipe that enters shutoff space, the tube wall of described water injection pipe front portion is interval with multiple safety valves around, the front end sleeve of water injection pipe is equipped with umbrella formula bracing or strutting arrangement, described umbrella formula bracing or strutting arrangement comprises umbrella-type support frame, stay pipe, hoop slides, piston rod, piston, wherein, the outer strut front portion of umbrella-type support frame is hinged on stay pipe, the internal overarm support of umbrella-type support frame is hinged on and slides on hoop, the hoop that slides connects the piston that can move forward in stay pipe inside through piston rod, the symmetrical guide-track groove that can make slip hoop move forward that has on the pipeline section that described slip hoop matches with stay pipe.
Described slip hoop comprises the outer tube being sleeved on stay pipe, is provided with the inner sleeve of fixed piston rod in outer tube, and inner sleeve and overcoat both sides are connected with the contiguous block that can move in stay pipe guide-track groove; Described piston rod two ends are threaded with the inner sleeve of piston and stay pipe respectively; The pipeline section front portion that described slip hoop matches with stay pipe is provided with the resiliency supported card that stops that the hoop that slides retreats; The pressure setting of described safety valve is 6MPa.
The coal mine underground fracturing encapsulating method that uses the above device, comprises the steps:
(a) drill, according to the bore direction of Construction Scheme, drill, to the boring of rib set depth;
(b) device assembling, at the front end suit umbrella formula bracing or strutting arrangement of water injection pipe, the umbrella-type support frame of umbrella formula bracing or strutting arrangement is connected on stay pipe, by piston rod, slip hoop and piston thread are linked together, again slip hoop is sleeved on stay pipe by guide-track groove, now, umbrella-type support frame is in contraction state;
(c) send pipe, the upper colligation polyurethane sealing pore area of the water injection pipe of safety valve is housed in front portion, afterwards water injection pipe is sent in boring, until desired location, again Grouting Pipe and return pipe are sent in boring, at water injection pipe, Grouting Pipe and return pipe, enter boring section colligation polyurethane sealing pore area simultaneously, drilling orifice is blocked;
(d) slip casting, before and after cement grout being injected by grouting pump, in the boring of polyurethane sealing of hole section shutoff, wait upon when return pipe is interior flows out slurries, close the valve on return pipe, continue to close grouting pump after slip casting 1～2min the shutoff before and after completing in polyurethane sealing of hole section shutoff boring;
(e) water filling, setting initial pressure water is 5MPa, the water under high pressure that is 5MPa by pressure by water injecting pump is by water injection pipe injection hole, and under the effect of 5MPa water under high pressure, the piston in stay pipe is passed forward, the slip hoop that drive is connected with piston rod moves forward, be hinged on the umbrella-type support frame sliding on hoop and strut, be punctured in coal body, along with water under high pressure constantly injects, polyurethane sealing of hole section before and after the pressure of water under high pressure constantly pushes, thus it is darker to make umbrella-type support frame thrust coal body;
(f) pressure break, improves the pressure of water filling, until last water injection pressure >=15MPa, when water injection pressure exceedes the 6MPa pressure of safety valve setting, safety valve is rushed to open, and water under high pressure enters boring from the entrance ejection of safety valve, and boring is implemented to fracturing work.
Beneficial effect: sealing device provided by the invention, plays a kind of effect of mechanical seal.When umbrella formula sealing device is sent into boring, it is contraction-like that device is, and is convenient to device and sends into boring.In device opening stage, hydraulic pressure deficiency, so that safety valve is opened, and can push away piston left, thereby the hoop that slides is moved to the left, and device is opened under the impetus of hoop of sliding.On stay pipe, there is stop-return slot, can avoid water under high pressure that pipe collar is pushed open, and then avoid the contraction of umbrella-type support frame.In the time of water under high pressure injection hole, water under high pressure will push sealing of hole section, thereby can make umbrella-type support frame thrust the just darker of coal body, has improved sealing of hole section bearing capacity, and then can improve the pressure of water filling, improves fracturing effect.
Advantage: pressure break sealing device structure provided by the invention is simple, utilize mechanical sealing to improve the bearing capacity of sealing of hole section, from having improved in essence the safety of device, and without the length that increases sealing of hole section, thereby the use amount that has reduced material, has reduced cost.
Accompanying drawing explanation
Fig. 1 is structure chart of the present invention.
Fig. 2 is the structure chart of stay pipe.
In figure: 1, water injection pipe; 2, coal body; 3, return pipe; 4, front and back polyurethane sealing of hole section; 5, safety valve; 6, umbrella formula bracing or strutting arrangement assembly; 6-1, umbrella-type support frame; 6-2, stay pipe; 6-3, slip hoop; 6-4, piston rod; 6-5, piston; 7, boring; 8, Grouting Pipe.
The specific embodiment
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
As shown in Figure 1, coal mine underground fracturing sealing device of the present invention, mainly consists of water injection pipe 1, return pipe 3, front and back polyurethane sealing of hole section 4, safety valve 5, umbrella formula bracing or strutting arrangement 6, Grouting Pipe 8.Water injection pipe 1, return pipe 3 and Grouting Pipe 8 are in polyurethane sealing of hole section is fixed on boring 7, wherein, water injection pipe 1 is through front and back polyurethane sealing of hole section 4, return pipe 3 and Grouting Pipe 8 enter in the space being formed by front and back polyurethane sealing of hole section 4 shutoff and boring, the return pipe 3 that enters shutoff space is long, the Grouting Pipe 8 that enters shutoff space is short, the tube wall of described water injection pipe 1 front portion is interval with multiple safety valves 5 around, the front end sleeve of water injection pipe 1 is equipped with umbrella formula bracing or strutting arrangement 6, described umbrella formula bracing or strutting arrangement 6 comprises umbrella-type support frame 6-1, stay pipe 6-2, hoop 6-3 slides, piston rod 6-4, piston 6-5, wherein, the outer strut front portion of umbrella-type support frame 6-1 is hinged on stay pipe 6-2, the internal overarm support of umbrella-type support frame 6-1 is hinged on and slides on hoop 6-3, the hoop 6-3 that slides connects the piston 6-5 that can move forward in stay pipe 6-2 inside through piston rod 6-4, the symmetrical guide-track groove that can make slip hoop 6-3 move forward that has on the pipeline section that described slip hoop 6-3 matches with stay pipe 6-2.Described piston rod 6-4 two ends are threaded with the inner sleeve of piston 6-5 and stay pipe 6-2 respectively; The pipeline section front portion that described slip hoop 6-3 matches with stay pipe 6-2 is provided with the resiliency supported card that stops that the hoop 6-3 that slides retreats, resiliency supported card and umbrella support card are similar, by spring and the fixture block being embedded in stay pipe 6-2 tube wall, formed, when the hoop 6-3 that slides moves forward to resiliency supported card front, resiliency supported card ejects, and blocks the hoop 6-3 that slides.The pressure setting of described safety valve 5 is 6MPa.
As shown in Figure 2, described slip hoop 6-3 comprises the outer tube being sleeved on stay pipe 6-2, is provided with the inner sleeve of fixed piston rod 6-4 in outer tube, and inner sleeve and overcoat both sides are connected with the contiguous block that can move in stay pipe 6-2 guide-track groove.
Coal mine underground fracturing encapsulating method of the present invention, concrete steps are as follows:
(a) drill, according to the bore direction of Construction Scheme, drill, take parallel hole as example, perpendicular to rib, play the boring of a designated depth;
(b) device assembling, at the front end suit umbrella formula bracing or strutting arrangement 6 of water injection pipe 1, the umbrella-type support frame 6-1 of umbrella formula bracing or strutting arrangement 6 is connected on stay pipe 6-2, by piston rod 6-4, slip hoop 6-3 and piston 6-5 are threaded togather, again slip hoop 6-3 is sleeved on stay pipe 6-2 by guide-track groove, now, umbrella-type support frame 6-1 is in contraction state;
(c) send pipe, the upper colligation polyurethane sealing pore area of the water injection pipe 1 of safety valve 5 is housed in front portion, afterwards water injection pipe 1 is sent in boring 7, until desired location, again Grouting Pipe 8 and return pipe 3 are sent in boring, at water injection pipe 1, Grouting Pipe 8 and return pipe 3, enter boring section colligation polyurethane sealing pore area simultaneously, drilling orifice is blocked; Described return pipe 3 is positioned at the top of water injection pipe 1, and Grouting Pipe 8 is positioned at the below of water injection pipe 1, and at the bottom of return pipe 3 entrances go deep into the hole of shutoff boring, Grouting Pipe 8 entrances enter shutoff boring, and return pipe 3 is long with respect to Grouting Pipe 8, and return pipe 3 is short with respect to Grouting Pipe 8;
(d) slip casting, before and after cement grout being injected by grouting pump, in the boring of polyurethane sealing of hole section 4 shutoff, while waiing upon the interior outflow slurries of return pipe 3, close the valve on return pipe 3, continue to close grouting pump after slip casting 1～2min the shutoff before and after completing in the 4 shutoff borings of polyurethane sealing of hole section;
(e) water filling, setting initial pressure water is 5MPa, the water under high pressure that is 5MPa by pressure by water injecting pump is by water injection pipe 1 injection hole, the 6MPa pressure of setting lower than safety valve 5 due to press water now, safety valve 5 can not be opened, under the effect of 5MPa water under high pressure, piston 6-5 in stay pipe 6-2 is passed forward, the slip hoop 6-3 that drive is connected with piston rod 6-4 moves forward, being hinged on the umbrella-type support frame 6-1 sliding on hoop 6-3 struts, be punctured in coal body, along with water under high pressure constantly injects, polyurethane sealing of hole section 4 before and after the pressure of water under high pressure constantly pushes, thereby it is darker to make umbrella-type support frame 6-1 thrust coal body, the anterior resiliency supported card arranging of pipeline section that the hoop 6-3 that slides matches with stay pipe 6-2 ejects, stop retreating of the hoop 6-3 that slides, improved sealing of hole section bearing capacity, and then can improve the pressure of water filling, improve fracturing effect,
(f) boring is carried out to fracturing, improve the pressure of water filling, until last water injection pressure >=15MPa, when water injection pressure exceedes the 6MPa pressure that safety valve 5 sets, safety valve 5 is opened, and water under high pressure enters boring from the entrance ejection of safety valve 5, and boring is implemented to fracturing work.
Claims (6)
1. a coal mine underground fracturing sealing device, comprise through polyurethane sealing of hole section and be fixed on the water injection pipe (1) in boring, return pipe (3) and Grouting Pipe (8), wherein, water injection pipe (1) is through front and back polyurethane sealing of hole sections (4), return pipe (3) and Grouting Pipe (8) enter in the space being formed by front and back polyurethane sealing of hole sections (4) shutoff and boring, the return pipe (3) that enters shutoff space is long, the Grouting Pipe (8) that enters shutoff space is short, it is characterized in that: the anterior tube wall of described water injection pipe (1) is interval with multiple safety valves (5) around, the front end sleeve of water injection pipe (1) is equipped with umbrella formula bracing or strutting arrangement (6), described umbrella formula bracing or strutting arrangement (6) comprises umbrella-type support frame (6-1), stay pipe (6-2), hoop (6-3) slides, piston rod (6-4), piston (6-5), wherein, the outer strut front portion of umbrella-type support frame (6-1) is hinged on stay pipe (6-2), the internal overarm support of umbrella-type support frame (6-1) is hinged on and slides on hoop (6-3), the hoop (6-3) that slides connects the piston (6-5) that can move forward in stay pipe (6-2) inside through piston rod (6-4), on the pipeline section that described slip hoop (6-3) matches with stay pipe (6-2), symmetry has the guide-track groove that can make slip hoop (6-3) move forward.
2. a kind of coal mine underground fracturing sealing device according to claim 1, it is characterized in that: described slip hoop (6-3) comprises the outer tube being sleeved on stay pipe (6-2), in outer tube, be provided with the inner sleeve of fixed piston rod (6-4), inner sleeve and overcoat both sides are connected with the contiguous block that can move in stay pipe (6-2) guide-track groove.
3. a kind of coal mine underground fracturing sealing device according to claim 1, is characterized in that: described piston rod (6-4) two ends are threaded with the inner sleeve of piston (6-5) and stay pipe (6-2) respectively.
4. a kind of coal mine underground fracturing sealing device according to claim 1, is characterized in that: the pipeline section front portion that described slip hoop (6-3) matches with stay pipe (6-2) is provided with the resiliency supported card that stops that the hoop (6-3) that slides retreats.
5. a kind of coal mine underground fracturing sealing device according to claim 1, is characterized in that: the pressure setting of described safety valve (5) is 6MPa.
6. right to use requires the coal mine underground fracturing encapsulating method of device described in 1, it is characterized in that, comprises the steps:
(a) drill, according to the bore direction of Construction Scheme, drill, to the boring of rib set depth;
(b) device assembling, at the front end suit umbrella formula bracing or strutting arrangement (6) of water injection pipe (1), the umbrella-type support frame (6-1) of umbrella formula bracing or strutting arrangement (6) is connected on stay pipe (6-2), by will slide hoop (6-3) and piston (6-5) of piston rod (6-4), be threaded togather, the hoop (6-3) that will slide is again sleeved on stay pipe (6-2) by guide-track groove, now, umbrella-type support frame (6-1) is in contraction state;
(c) send pipe, the upper colligation polyurethane sealing pore area of the water injection pipe (1) of safety valve (5) is housed in front portion, afterwards water injection pipe (1) is sent in boring (7), until desired location, again Grouting Pipe (8) and return pipe (3) are sent in boring, at water injection pipe (1), Grouting Pipe (8) and return pipe (3), enter boring section colligation polyurethane sealing pore area simultaneously, drilling orifice is blocked;
(d) slip casting, by grouting pump, cement grout is injected in the boring of front and back polyurethane sealing of hole section (4) shutoff, wait upon when return pipe (3) is interior flows out slurries, close the valve on return pipe (3), continue to close grouting pump after slip casting 1～2min the shutoff before and after completing in polyurethane sealing of hole section (4) shutoff boring;
(e) water filling, setting initial pressure water is 5MPa, the water under high pressure that is 5MPa by pressure by water injecting pump is by water injection pipe (1) injection hole, under the effect of 5MPa water under high pressure, piston (6-5) in stay pipe (6-2) is passed forward, drive the slip hoop (6-3) being connected with piston rod (6-4) to move forward, being hinged on the umbrella-type support frame (6-1) sliding on hoop (6-3) struts, be punctured in coal body, along with water under high pressure constantly injects, polyurethane sealing of hole section (4) before and after the pressure of water under high pressure constantly pushes, thereby it is darker to make umbrella-type support frame (6-1) thrust coal body,
(f) pressure break, improves the pressure of water filling, until last water injection pressure >=15MPa, when water injection pressure exceedes the 6MPa pressure of safety valve (5) setting, safety valve (5) is rushed to open, and water under high pressure enters boring from the entrance ejection of safety valve (5), and boring is implemented to fracturing work.
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| CN113431517A (en) * | 2021-06-23 | 2021-09-24 | 华能灵台邵寨煤业有限责任公司 | Quick plugging device suitable for multi-aperture cyclic multiplexing orifice |
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