WO2019205355A1

WO2019205355A1 - Multi-stage coal seam water injection borehole packing system and water injection borehole packing method

Info

Publication number: WO2019205355A1
Application number: PCT/CN2018/100392
Authority: WO
Inventors: 于岩斌; 程卫民; 柳茹林; 吕同; 吴立荣; 许庆峰; 姜爱伟
Original assignee: 山东科技大学
Priority date: 2018-04-25
Filing date: 2018-08-14
Publication date: 2019-10-31
Also published as: CN108661693A; CN108661693B

Abstract

Disclosed are a multi-stage coal seam water injection borehole packing system and a multi-stage coal seam water injection borehole packing method, with the use of a corresponding multi-stage coal seam water injection borehole packing apparatus, thus realizing effective packing of the same water injection borehole (10) in different mining-influenced areas. The multi-stage coal seam water injection borehole packing apparatus mainly comprises an outflow device, a hydraulic expansion hole packing device, a fastening device and an automatic cutoff device which are sequentially connected in series from front to back. Dynamically differential hole packing in the different mining influenced areas is realized by means of adjusting the number of stages of the multi-stage coal seam water injection borehole packing apparatus.

Description

Multi-stage coal seam water injection drilling sealing system and water injection drilling sealing method

Technical field

The invention relates to the field of coal mine coal mining face disaster prevention and control, in particular to a multi-stage coal seam water injection drilling sealing system and a multi-stage coal seam water injection drilling sealing method.

Background technique

As a secondary production of coal mine underground production, dust has been plagued by coal mine safety production. The presence of dust not only accelerates equipment loss, but also easily causes gas and coal dust explosion accidents, causing huge economic losses and seriously threatening the safe and efficient production of coal mining enterprises. In addition, long-term high-concentration dust workplaces, workers are prone to occupational pneumoconiosis, and damage the health of workers. At present, many studies and practices have shown that the traditional coal seam water-injection pre-wet coal body is one of the most basic and effective dust-proof measures for the mining face. It is pre-injected into the coal seam by drilling several holes before the operation. High-pressure water, high-pressure water injected into the coal body penetrates along the coal fissures and is stored in the fissures and pores, thereby increasing the moisture of the coal body, moistening the original coal dust in the coal body, causing it to lose its flying capacity and reduce The ability to produce floating dust during coal mining. In addition to being affected by the objective conditions of the coal seam itself, the quality of the sealing hole of the water injection hole is directly related to the key problem of the dust-proof effect of the coal seam water injection.

During the mining process of the coal mining face, the mining stress experienced by the water injection drilling hole changes continuously, so that the degree of coal wall fracture around the drilling hole also dynamically changes, so that the effective sealing length of the water injection drilling hole is not fixed. The sealing method is to seal the hole with cement mortar. The method takes a long time, the material waste is serious, the operation is inconvenient, the pressure bearing capacity is small, and the sealing hole length is fixed, which cannot meet the dynamic development requirement of the sealing hole length during the mining process. At present, the simple sealing method adopted by domestic coal mines is the sealing of the sealing device, but the traditional sealing device is mainly composed of hydraulic expansion, compressed air expansion and mechanical expansion, mainly used for short hole injection of coal wall, and for long drilling. Coal seam water injection, especially under high pressure water injection conditions, is limited by the length of sealing hole and structural design. It often has sealing quality problems such as water leakage and water immersion, and the sealing device is easy to be smashed under the action of high pressure water. Out, especially the traditional hydraulic expansion sealer during the stop or intermittent water injection, the water pressure in the sealer is reduced, the expansion rubber stopper shrinks, and the sealer is thrown at a high speed under the action of the pressure difference between the inside and the outside of the borehole, resulting in The leakage of water in the borehole causes the underground working environment to deteriorate and seriously endangers the life safety of the underground workers. It can be seen that the existing conventional coal seam water sealing method and related sealing device need further improvement and development.

Summary of the invention

In view of the above deficiencies of the prior art, the object of the present invention is to provide a multi-stage coal seam water injection drilling sealing system and a multi-stage coal seam water injection drilling sealing method, which can effectively solve the coal seam water injection drill in the long injection period. Hole sealing is not strict, water leakage, smashing and other issues to improve the effect of water injection and disaster reduction.

In order to solve the above technical problem, the solution of the present invention includes:

A multi-stage coal seam water injection drilling sealing system, comprising a water supply mechanism and a multi-stage coal seam water injection drilling sealing mechanism, wherein the multi-stage coal seam water injection drilling sealing mechanism comprises a Class I complete seepage period unit, II Grade micro-cracking steady flow unit and class III crushing torrent unit, each unit includes at least one multi-stage coal seam water injection hole sealer, and water injection drilling seal for multi-stage coal seam according to the degree of coal wall fracture in the corresponding unit The requirement of the length of the hole device increases or decreases the number of series stages of the multi-stage coal seam water injection drilling and sealing device, and dynamically seals the coal seam water injection hole.

The multi-stage coal seam water injection drilling and sealing system, wherein the multi-stage coal seam water injection drilling hole sealing device comprises an outflow device, a hydraulic expansion sealing device and a fastening device arranged in series from front to back. And the automatic cut-off device, the four are connected in series by thread, and the automatic cut-off device is connected with the water injection pipe of the underground coal seam of the water supply mechanism.

The multi-stage coal seam water injection drilling and sealing system, wherein the hydraulic expansion sealing device comprises a plurality of expanded steel hoses connected by a joint thread, and both ends of the expanded steel hose pass the internal thread joint or the external thread joint The string is followed by an outflow device and a fastening device, the fastening device has a fastening inner tube, the inner tube is alternately sleeved with an expansion rubber plug and a support sleeve, and the end end of the fastening inner tube is sleeved with a fastening nut, The fastening device is followed by an automatic shut-off device. The expanded steel hose in the hydraulic expansion sealing device can be increased or decreased according to the required length of the sealing hole to provide a sealing length according to the actual situation. The fastening device forms a threaded assembly by fastening the end of the inner tube to the joint of the hydraulic expansion plugging device. Two sets of expansion rubber plugs and support sleeves are alternately arranged in the outer part of the fastening inner tube, and a fastening nut is arranged outside the end support sleeve, and the fastening nut is screwed through the thread of the end of the inner tube, thereby tightening The mechanical pressing action of the solid nut causes the expansion rubber plug to expand and deform, so the degree of rotation of the fastening nut controls the expansion degree of the expansion rubber plug to meet the mechanical sealing requirements of the drill holes of different diameters.

The multi-stage coal seam water injection drilling and sealing system, wherein the outflow device comprises a pressure regulating joint, the pressure regulating joint is inserted into the pressure regulating spring, and the end of the pressure regulating spring is provided with a shutoff valve, and one end of the shutoff valve The cylindrical positioning end penetrates the above-mentioned pressure regulating spring, and the other end of the shutoff valve is a conical valve core, the cone top of the conical valve core abuts against the stepped end of the internal thread joint, and the expanded steel hose end The joint of the head forms a threaded fit with the pressure regulating joint. The pressure regulating joint is screwed with the joint of the hydraulic expansion sealing device, and the elastic potential energy of the pressure regulating spring is controlled by adjusting the length of the screwing screw, thereby adjusting the pressure of the water outlet, and achieving different expansion degrees of the hydraulic expansion sealing device, satisfying Sealing requirements for drilling holes of different diameters. The multi-stage hydraulic expansion sealing device comprises a plurality of expanded steel hoses connected by a joint thread, and the threaded assembly ends of the joints are respectively connected by internal threads and external threads to realize the combined use of the multi-section sealing device. The fastening device has an inner tube, and the inner tube is alternately sleeved with an expansion rubber plug and a support sleeve, and the end end of the inner tube is also sleeved with a fastening nut, and the fastening device is followed by an automatic cut-off device.

The multi-stage coal seam water injection drilling and sealing system, wherein the automatic cut-off device comprises a shut-off valve body, the inner end of the shut-off valve body forms a threaded assembly with the fastening device, and the outer end of the shut-off valve body is provided with a quick joint. The cut-off valve body is provided with a cut-off spring and a cut-off valve core, one end of the cut-off valve core penetrates the cut-off spring, and the other end is elastically abutted on the inlet of the flow-through chamber of the multi-stage coal seam water injection hole sealer. The cut-off valve core is designed in a spherical shape, and the projected area thereof is larger than the end area of the cut-off spring and the cross-sectional area of the passage. The shut-off valve body is further provided with a drain port, and the drain port is provided with a drain switch. The drain port and the drain switch are used to realize the pressure relief cycle of the plug sealer.

The multi-stage coal seam water injection drilling and sealing system, wherein the above-mentioned shut-off valve body is further provided with a discharge port, and a discharge switch is arranged on the discharge port.

The multi-stage coal seam water injection drilling and sealing system, the water supply mechanism comprises a downhole water pipe, and the underground water pipe is connected with the water storage tank through a connecting pipe, and the water storage tank is connected with the water injection pump through a corresponding pipeline, and the water injection pump passes through the three-way pipe. The water injection pipeline is connected and connected, and a flow meter and a pressure gauge are arranged on the corresponding pipeline, and the three-way component is connected with a one-way shut-off valve through a corresponding pipeline, and the one-way shutoff valve is connected with the water storage tank.

A multi-stage coal seam water injection drilling sealing method with the above multi-stage coal seam water injection drilling sealing system comprises the following steps:

A. The 1-3 grade coal seam water injection drilling and sealing device is used to seal the I-stage complete seepage period unit, and the corresponding multi-stage coal seam water injection drilling and sealing device is arranged to make the expansion steel hose have sufficient water pressure. To meet the expansion diameter requirement, the multi-stage coal seam water injection drilling and sealing device connected in series is placed in the coal seam water injection hole to expand the expansion rubber plug, and the multi-stage coal seam water injection drilling and sealing device is fastened to the water injection hole. Internal; close the drain switch, connect the downhole water injection pipeline with the quick joint, perform hydraulic expansion and sealing, and coal seam water injection;

B. With the advancement of the working face, the distance between the water injection borehole and the working face in the I-stage complete seepage period unit is shortened, and the water injection borehole enters the class II micro-cracking steady flow period unit, and the 4-6 grade coal seam water injection hole is used. The sealing device seals the II-stage micro-cracking steady flow unit, and separates the water injection pipeline and the quick joint in the I-stage complete seepage period unit, and the water injection hole in the I-stage complete seepage period unit is fully wetted by the water injection hole. After the coal body stops or stops the coal seam water injection work, open the drain switch to discharge the remaining pressure water in the borehole, and then return the expansion rubber plug to the original state, and take out the 1-3 grade coal seam water injection hole sealing hole in the I-stage complete seepage period unit. And lengthened to the 4-6 coal seam water injection drilling and sealing device, the 4-6 coal seam water injection drilling and sealing device is placed in the water injection hole of the second-stage micro-cracking steady flow unit, and tightened with a wrench. The fastening nut of the device causes the expansion rubber plug to expand, so that the sealing device is fastened inside the water injection hole; the expansion rubber plug is expanded, and the multi-stage coal seam water injection drilling and sealing device is fastened inside the water injection hole; Drain switch, the underground water injection pipeline and fast The joints are connected, hydraulic expansion and sealing, and coal seam water injection work.

C. With the advancement of the working face, the distance between the water injection borehole and the working face in the Class II micro-cracking steady flow unit is further shortened, and the Class III crushing torrent unit is used by using the 7-0 coal seam water injection drilling sealer. Sealing, take out the 4-6 coal seam water injection drilling sealer of the II grade micro-cracking steady flow unit and lengthen it to the 7-10 coal seam water injection drilling sealer, repeat the multi-stage coal seam water injection drilling in step B The sealing device is disassembled, the number of series of hydraulic expansion and sealing devices is increased, the assembly process steps are closed, the discharge switch is closed, the underground water injection pipe is connected with the quick joint, and the hydraulic expansion sealing and the coal seam water injection work are performed;

This operation is repeated until the coal seam is completed.

The invention provides a multi-stage coal seam water injection drilling sealing system and a multi-stage coal seam water injection drilling sealing method. The flexible combined multi-stage hydraulic expansion sealing structure of the invention can effectively solve different water injection periods of long drilling holes. The sealing problem, combined with the fastening device and the automatic cutting device, further ensures the safety and high efficiency of the coal seam water injection process, especially the sealing compactness, safety and reliability of the sealing device during high pressure water injection, and has the advantages of simple structure and convenient operation. The utility model has the advantages of low cost, strong sealing flexibility, and the like, and can effectively solve the problems of insufficient sealing, water leakage and squeezing of the coal injection hole in the excessively long water injection period, so as to improve the effect of water injection and disaster reduction.

DRAWINGS

1 is a schematic view of a multi-stage coal seam water injection drilling and sealing system according to the present invention;

2 is a schematic view of a multi-stage coal seam water injection drilling hole sealer according to the present invention;

Among them, 1, underground water pipe; 2, water storage tank; 3, connecting pipe; 4, water injection pump; 5, flow meter; 6, pressure gauge; 7, one-way stop valve; 8, three-way parts; 10, water injection drilling; 11, the sealing section of the I-stage complete seepage period unit; the sealing section of the 12-stage and II-stage micro-cracking steady-flow period unit; and the sealing section of the 13-stage crushing torrent unit; Pressure regulating joint; 15, pressure regulating spring; 16, shut-off valve; 17, internal thread joint; 18, expanded steel hose; 19, external thread joint; 20, fastening inner tube; 21, expansion rubber plug; Tube; 23, fastening nut; 24, shut-off valve body; 25, cut-off spring; 26, cut-off spool; 27, discharge port; 28, drain switch; 29, quick connector.

detailed description

The invention provides a multi-stage coal seam water injection drilling sealing system and a multi-stage coal seam water injection drilling sealing method. In order to make the object, technical solution and effect of the present invention more clear and clear, the present invention is further described in detail below. . It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The invention provides a multi-stage coal seam water injection drilling and sealing system, as shown in Fig. 1 and Fig. 2, the drilling water injection period is divided into a Class I complete seepage period and a Class II micro as the work faces forward. The fission steady flow period and the third-stage fracture torrent period are further divided into a Class I complete seepage period unit, a Class II microcracking steady flow unit, and a Class III broken torrent unit. For example, it can be divided according to distance, such as 100 meters from the working surface. - The area of 200 meters is the class III crushing torrent, and so on, of course, it can also be adapted according to the site construction conditions. That is to say, with the work facing forward, the water injection drilling distance from the working surface from the far side and the near side through the I-class complete seepage period unit, the second-stage micro-cracking steady flow unit, the third-stage broken torrent period unit, the same water injection hole The dynamic difference sealing of coal seam water injection drilling holes is realized by increasing or decreasing the series number of multi-stage coal seam water injection drilling and sealing devices in different water injection periods. That is to say, with the gradual advancement of the working surface, as shown in Figure 1, according to the distance, there will be a Class I complete seepage period unit, a Class II micro-cracking steady flow unit, and a Class III broken torrent unit at the same time, but With the continuous advancement of the working face, the original Class III broken torrent unit will be mined, and the original Class I complete seepage unit will gradually transform into a Class II microcracking steady flow unit, and finally into a Class III broken torrent. The unit is finally finished.

The multi-stage coal seam water injection drilling hole sealer of the invention comprises an outflow device, a hydraulic expansion sealing device, a fastening device and an automatic cut-off device which are sequentially connected in series from front to back. As shown in Fig. 2, the four-part device is connected in series by threads, and the automatic shut-off device is connected with the water injection pipe 9 in the underground. The water injection pipe 9 supplies water to the multi-stage coal seam water injection drilling and sealing device, and the water supply mechanism includes underground The water pipe 1, the downhole water pipe 1 is connected to the water storage tank 2 through the connecting pipe 3, and the water storage tank 2 is connected to the water injection pump 4 through a corresponding pipeline, and the water injection pump 4 is connected to the water injection pipeline 9 through the three-way member 8, and the corresponding pipeline The flow meter 5 and the pressure gauge 6 are disposed, and the three-way member 8 is connected to a one-way shut-off valve 7 through a corresponding pipeline, and the one-way shutoff valve 7 communicates with the water storage tank 2, and the water pressure in the water injection pipeline 9 When it is too large, it flows back into the water storage tank 2 through the one-way shutoff valve 7. Through the underground water pipe 1, the water storage tank 2, the connecting pipe 3, the water injection pump 4, the flow meter 5, the pressure gauge 6, the one-way stop valve 7 and the three-way member 8, the high-pressure water injection of the coal seam and the monitoring of the water injection parameters are realized.

The outflow device of the multi-stage coal seam water injection drilling and sealing device of the invention comprises a pressure regulating joint 14, and the pressure regulating joint 14 is inserted into the pressure regulating spring 15, and the end of the pressure regulating spring 15 is provided with a shut-off valve 16, a pressure regulating spring The diameter of one end of 15 is larger than the diameter of the outlet of the pressure regulating joint 14, and the other end is matched with the shutoff valve 16. The pressure regulating joint 14 is connected in series with the hydraulic expansion sealing device. One end of the shutoff valve 16 is a cylindrical positioning end, the cylindrical positioning end penetrates the pressure regulating spring 15, and the other end of the shutoff valve 16 is a conical valve core. The cone top of the spool abuts against the stepped end of the female threaded joint 17.

The pressure regulating joint 14 is screwed with the female threaded joint 17 of the hydraulic expansion sealing device, and the elastic potential energy of the pressure regulating spring 15 is controlled by adjusting the length of the screwing screw, thereby adjusting the pressure of the water outlet to realize the hydraulic expansion sealing device. Different degrees of expansion to meet the sealing requirements of different diameter drill holes.

The hydraulic expansion sealing device comprises a plurality of expanded steel hoses 18 connected in series by the female threaded joints 17, and the hydraulic expansion sealing device realizes the multi-section sealing device by the joint connection manner of the female threaded joints 17 and the externally threaded joints 19 The series use of the expanded steel hose 18 at both ends is also connected in series to other devices through the female joint 17 and the male joint 19. The female threaded joint 17 of the front end of the expanded steel hose hose 18 is threadedly assembled with the pressure regulating joint 14, and the male threaded joint 19 of the rear end of the expanded steel hose hose 18 is threadedly assembled with the fastening inner tube 20 of the fastening device. Two sets of expansion rubber plugs 21 and support sleeves 22 are alternately arranged in the outer periphery of the fastening inner tube 20, and a fastening nut 23 is arranged outside the end support sleeve 22, and the fastening nut 23 passes through the thread of the end of the inner tube 20. The screwing operation is performed, whereby the expansion rubber plug 21 is expanded and deformed by the mechanical pressing action of the fastening nut 23, and the degree of rotation of the fastening nut 23 controls the degree of expansion of the expansion rubber plug 21 to meet the mechanical drilling of different diameters. Sealing requirements.

The automatic shutoff device includes a shutoff valve body 24, the front end of the shutoff valve body 24 is threadedly fitted with the rear end of the fastening inner tube 20, and the outer end of the shutoff valve body 24 is provided with a quick joint 29. A cut-off spring 25 and a shut-off valve core 26 are disposed in the shut-off valve body 24, specifically, the flow-closing chamber is provided in the shut-off valve body 24, the cut-off spring 25 is disposed in the flow-through chamber, and one end of the shut-off valve core 26 penetrates the cut-off spring 25, and One end is resiliently abutted against the inlet of the throughflow chamber. The cut-off spool 26 is designed in a spherical shape, and its projected area is larger than the end area of the cut-off spring 25 and the cross-sectional area of the passage. A drain port 27 is also formed in the shutoff valve body 24. A drain switch 28 is disposed on the drain port 27, and the pressure relief port of the plug sealer is realized through the drain port 27 and the drain switch 28.

The assembly process and the use method of the multi-stage coal seam water injection drilling and sealing system of the present invention are as follows: the cylindrical positioning end of the shut-off valve 16 is placed in the pressure regulating spring 15, and then the whole is placed in the pressure regulating joint 14 to make the cutoff The conical spool of the valve 16 is upwardly connected to the internally threaded joint 17 of the hydraulic expansion sealing device by screw fitting, and sequentially passed through the externally threaded joint 19 to the fastening inner tube 20 of the fastening device. The two sets of expansion rubber plugs 21 and the support sleeve 22 are alternately arranged in the outer periphery of the fastening inner tube 20, and the outer side of the support sleeve 22 is provided with a fastening nut 23 outside, and the rear end of the inner tube 20 is fixed at a certain distance. Thread, the fastening nut 23 can adjust the screwing position on the external thread of the section, the end of the fastening inner tube 20 is threadedly connected with the shut-off valve body 24 of the automatic cut-off device, and the cut-off spring 25 and the cut-off spool 26 are sequentially located at the shut-off valve In the body 24, the quick joint 29 of the automatic shut-off device is connected to the downhole water injection pipe 9 to complete the assembly of the first-stage coal seam water injection drilling sealer. The two-stage hydraulic expansion sealing device is connected in series by the internal threaded joint 17 and the externally threaded joint 19, and the assembly steps of the above-mentioned outflow device, hydraulic expansion sealing device, fastening device and automatic cut-off device are repeated to complete the second-order coal seam Water injection drilling sealer assembly. Similarly, the multi-section hydraulic expansion sealing device is connected through the cooperation of the female threaded joint 17 and the male threaded joint 19, and the above assembly steps are repeated to complete the multi-stage coal seam water injection drilling and sealing device assembly.

In order to describe in more detail the multi-stage coal seam water injection drilling and sealing method of the present invention, taking three water injection drilling holes as an example, as shown in FIG. 1 , the following describes its working process in detail:

(1) When the water injection hole 10 is far away from the working surface and is not affected by the mining surface stress, the coal wall around the borehole is relatively complete and is in the Class I complete seepage period, which is the Class I complete seepage period unit. The length of the sealing hole is short, and the sealing hole of the 1-3 grade coal seam water injection drilling and sealing device is used as the sealing section 11 of the I-stage complete seepage period unit for sealing work. Take 1-3 grade coal seam water injection drilling sealer, screw into a certain degree of pressure regulating joint 14, so that the expanded steel hose 18 has sufficient water pressure to meet the expansion diameter demand, and the serially sealed sealer is placed in the coal seam. In the corresponding water injection hole 10, the fastening nut 23 of the fastening device is screwed by a wrench to promote the expansion of the expansion rubber plug 21, so that the multi-stage coal seam water injection hole sealing device is fastened inside the water injection hole; The switch 28 connects the downhole water injection pipe 9 with the quick joint 29 to perform hydraulic expansion sealing and coal seam water injection work.

(2) With the advancement of the working face, the distance between the water injection hole 10 and the working surface is shortened, the drilling hole enters the influence range of the mining stress, and the surrounding coal wall begins to damage and rupture, and the water injection hole also enters the class II micro-cracking. The flow period, that is, the I-stage complete seepage period unit is transformed into the second-stage micro-cracking steady-flow period unit. The required sealing length is increased correspondingly during this period, and the series number of the coal seam water-filled hole sealer should be increased to reach 4 Level -6, the sealing section 12 is used as the sealing section 12 of the class II microcracking steady flow period unit. First, the water injection pipe 9 is separated from the quick joint 29, and the automatic shut-off device prevents the reverse pressure of the water in the borehole, and the fastening device prevents the sealer from being thrown out by the internal pressure water of the borehole, thereby realizing the safety of the water injection work. After the drilling hole is filled with water to fully wet the coal body or stop the coal layer water injection work, the drain switch 28 is opened, the remaining pressure water in the corresponding water injection hole 10 is discharged, and then the tightening nut 23 is rotated to restore the expansion rubber plug 21 to the original state, and taken out. The hole sealer is separated from the fastening device and the hydraulic expansion sealing device, and the threaded fitting of the female threaded joint 17 and the male threaded joint 19 is used to appropriately increase the series number of the multi-stage coal seam water injection drilling and sealing device, To meet the requirements of the length of the sealing hole, the fastening device and the hydraulic expansion sealing device are normally assembled, and the multi-stage coal seam water injection drilling and sealing device is placed in the corresponding water injection hole 10, and the fastening device is screwed into the fastening device. The nut 23 causes the expansion rubber plug 21 to expand, so that the multi-stage coal seam water injection hole sealer is fastened inside the corresponding water injection hole 10; the drain switch 28 is closed, and the underground water injection pipe 9 is connected with the quick joint 29 for performing Hydraulic expansion sealing and coal seam water injection work.

(3) With the further advancement of the working face, the distance between the water injection hole 10 and the working surface is further shortened, and the drilling hole enters the mining stress action zone, and the surrounding coal wall is under pressure and rupture conduction, and the water injection drilling hole also enters. The third-stage crushing torrent period, that is, the class II micro-cracking steady-flow period unit is transformed into the class III-breaking torrent unit, and the length of the sealing hole required for this period is long, and the series of series of sealing units for water injection for long-hole coal seams should be continued. It is made to reach the 7-10 level, and the sealing section 13 as the class III crushing torrent unit performs the sealing operation. Repeat (2) multi-stage coal seam water injection drilling hole sealer disassembly, increase hydraulic expansion and sealing device series series, assembly process steps, water injection work of III grade crushing torrent during water injection drilling 10, until water injection drilling 10 After the water injection work is completed, the drain switch 28 is opened, the remaining pressure water in the borehole is discharged, and then the tightening nut 23 is rotated to restore the expansion rubber plug 21 to its original shape, and the sealer is taken out for recycling.

The above description is of course only a preferred embodiment of the present invention, and the present invention is not limited to the above-described embodiments, and all equivalent substitutes made by those skilled in the art under the teachings of the present specification should be explained. The obvious deformation forms are all within the scope of the present specification and are supposed to be protected by the present invention.

Claims

Multi-stage coal seam water injection drilling sealing system, comprising water supply mechanism and multi-stage coal seam water injection drilling sealing mechanism, characterized in that multi-stage coal seam water injection drilling sealing mechanism comprises a class I complete seepage period unit , Class II micro-cracking steady flow unit, and class III crushing torrent unit, each unit includes at least one multi-stage coal seam water injection drilling sealer, and water injection drill for multi-stage coal seam according to the degree of coal wall fracture in the corresponding unit The requirement of the length of the hole sealer increases or decreases the number of series stages of the multi-stage coal seam water injection drilling sealer, and dynamically seals the coal seam water injection hole.
The multi-stage coal seam water injection drilling and sealing system according to claim 1, wherein the multi-stage coal seam water injection drilling hole seal comprises an outflow device and a hydraulic expansion seal which are sequentially connected in series from front to back. The hole device, the fastening device and the automatic cut-off device are connected in series by threads in series, and the automatic cut-off device is connected with the water injection pipe of the underground coal seam of the water supply mechanism.
The multi-stage coal seam water injection drilling sealing system according to claim 2, wherein the hydraulic expansion sealing device comprises a plurality of expanded steel hoses connected in series by a joint thread, and both ends of the expanded steel hose pass through The threaded joint or the externally threaded joint is followed by an outflow device and a fastening device, the fastening device having a fastening inner tube, the inner tube is alternately sleeved with the expansion rubber plug and the support sleeve, and the end of the inner tube is fastened Socket the fastening nut, and the fastening device is followed by an automatic shut-off device.
The multi-stage coal seam water injection drilling and sealing system according to claim 3, wherein the outflow device comprises a pressure regulating joint, and the pressure regulating joint penetrates into the pressure regulating spring, and the end of the pressure regulating spring is set to be cut off. a valve, one end of the shut-off valve is a cylindrical positioning end, the cylindrical positioning end penetrates the above-mentioned pressure regulating spring, and the other end of the shut-off valve is a conical valve core, and the cone top of the conical valve core abuts against the stepped end of the internal threaded joint And the joint of the expanded steel hose end and the pressure regulating joint form a threaded assembly.
The multi-stage coal seam water injection drilling and sealing system according to claim 4, wherein the automatic shut-off device comprises a shut-off valve body, and the inner end of the shut-off valve body forms a screw assembly with the fastening device, and the valve body is closed. The outer end is provided with a quick joint, the cut-off valve body is provided with a cut-off spring and a cut-off valve core, one end of the cut-off valve core is inserted into the cut-off spring, and the other end is elastically abutted against the inlet of the flow-through chamber of the multi-stage coal seam water injection drilling and sealing device. on.
The multi-stage coal seam water injection drilling and sealing system according to claim 5, wherein the shut-off valve body is further provided with a drain port, and the drain port is provided with a drain switch.
The multi-stage coal seam water injection drilling and sealing system according to claim 1, wherein the water supply mechanism comprises a downhole water pipe, and the underground water pipe is connected to the water storage tank through a connecting pipe, and the water storage tank is connected with the water injection pump through the corresponding pipeline, the water injection pump The three-way piece is connected with the water injection pipeline, and the flow meter and the pressure gauge are arranged on the corresponding pipeline, and the three-way component is connected with a one-way stop valve through the corresponding pipeline, and the one-way shutoff valve is connected with the water storage tank.
A multi-stage coal seam water injection drilling and sealing method with a multi-stage coal seam water injection drilling and sealing system according to claim 1, comprising the following steps:

A. The 1-3 grade coal seam water injection drilling and sealing device is used to seal the I-stage complete seepage period unit, and the corresponding multi-stage coal seam water injection drilling and sealing device is arranged to make the expansion steel hose have sufficient water pressure. To meet the expansion diameter requirement, the multi-stage coal seam water injection drilling and sealing device connected in series is placed in the coal seam water injection hole to expand the expansion rubber plug, and the multi-stage coal seam water injection drilling and sealing device is fastened to the water injection hole. Internal; close the drain switch, connect the downhole water injection pipeline with the quick joint, perform hydraulic expansion and sealing, and coal seam water injection;

B. With the advancement of the working face, the distance between the water injection borehole and the working face in the I-stage complete seepage period unit is shortened, and the water injection borehole enters the class II micro-cracking steady flow period unit, and the 4-6 grade coal seam water injection hole is used. The sealing device seals the II-stage micro-cracking steady flow unit, and separates the water injection pipeline and the quick joint in the I-stage complete seepage period unit, and the water injection hole in the I-stage complete seepage period unit is fully wetted by the water injection hole. After the coal body stops or stops the coal seam water injection work, open the drain switch to discharge the remaining pressure water in the borehole, and then return the expansion rubber plug to the original state, and take out the 1-3 grade coal seam water injection hole sealing hole in the I-stage complete seepage period unit. And lengthened to the 4-6 coal seam water injection drilling and sealing device, the 4-6 coal seam water injection drilling and sealing device is placed in the water injection hole of the second-stage micro-cracking steady flow unit, and tightened with a wrench. The fastening nut of the device causes the expansion rubber plug to expand, so that the sealing device is fastened inside the water injection hole; the expansion rubber plug is expanded, and the multi-stage coal seam water injection drilling and sealing device is fastened inside the water injection hole; Drain switch, the underground water injection pipeline and fast The joints are connected, hydraulic expansion and sealing, and coal seam water injection work.

C. With the advancement of the working face, the distance between the water injection borehole and the working face in the Class II micro-cracking steady flow unit is further shortened, and the Class III crushing torrent unit is used by using the 7-0 coal seam water injection drilling sealer. Sealing, take out the 4-6 coal seam water injection drilling sealer of the II grade micro-cracking steady flow unit and lengthen it to the 7-10 coal seam water injection drilling sealer, repeat the multi-stage coal seam water injection drilling in step B The sealing device is disassembled, the number of series of hydraulic expansion and sealing devices is increased, the assembly process steps are closed, the discharge switch is closed, the underground water injection pipe is connected with the quick joint, and the hydraulic expansion sealing and the coal seam water injection work are performed;

This operation is repeated until the coal seam is completed.