LU101604B1 - Hydraulic Perforation Unmanned Gas Extraction Method - Google Patents
Hydraulic Perforation Unmanned Gas Extraction Method Download PDFInfo
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- LU101604B1 LU101604B1 LU101604A LU101604A LU101604B1 LU 101604 B1 LU101604 B1 LU 101604B1 LU 101604 A LU101604 A LU 101604A LU 101604 A LU101604 A LU 101604A LU 101604 B1 LU101604 B1 LU 101604B1
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- high pressure
- gas extraction
- perforation
- roadway
- gas
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- 238000000605 extraction Methods 0.000 title claims abstract description 114
- 239000003245 coal Substances 0.000 claims abstract description 124
- 230000005641 tunneling Effects 0.000 claims abstract description 54
- 238000002955 isolation Methods 0.000 claims abstract description 48
- 238000000034 method Methods 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 77
- 230000000903 blocking effect Effects 0.000 claims description 40
- 239000000463 material Substances 0.000 claims description 29
- 230000000977 initiatory effect Effects 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
- 239000006004 Quartz sand Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 230000015271 coagulation Effects 0.000 claims description 3
- 238000005345 coagulation Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 230000002459 sustained effect Effects 0.000 claims description 3
- 239000011435 rock Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 description 8
- 230000007423 decrease Effects 0.000 description 6
- 230000003247 decreasing effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005553 drilling Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/114—Perforators using direct fluid action on the wall to be perforated, e.g. abrasive jets
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/103—Dams, e.g. for ventilation
- E21F17/107—Dams, e.g. for ventilation inflatable
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Road Repair (AREA)
Abstract
Disclosed is a hydraulic perforation unmanned gas extraction method, comprising: firstly perforating at the central line of coal body in the forward direction of working face for tunneling in coal roadway using a high pressure hydraulic perforating gun to form high pressure hydraulic perforation, then performing fracture in the coal body around the high pressure hydraulic perforation using a high pressure hydraulic fracturing gun to obtain the high pressure hydraulic fracturing holes with cracks, high pressure hydraulic fracturing holes are used as the outflow channels of the gas in coal body, then arranging a gas safety isolation airbag and gas extraction pipe in the roadway at the rear of the coal body, the gas extraction pipe passes through the gas safety isolation airbag into the high pressure hydraulic fracturing holes, the gas is extracted via the gas extraction pipe. The gas extraction system of the present invention enhances the work efficiency in the processes of roadway tunneling and rock cross-cut coal uncovering, and is ensures the safety of the constructors. The gas can be extracted from the coal body in front of tunneling working face and in front of rock cross-cut coal uncovering safely, efficiently and fast.
Description
BL-5123 1 DESCRIPTION 10101608 Hydraulic Perforation Unmanned Gas Extraction Method
BACKGROUND Field of the Invention The present invention belongs to the technical field of coal mine gas management, relates to a method of gas extraction, and specifically relates to a method of unmanned gas extraction by hydraulic perforation. Background of the Invention At present, the mine shafts having the danger of coal and gas outburst occupy a larger proportion in key coal mines of our country, coal and gas outburst have the features of suddenness, violence, complex in dynamic action and the like, it specifically represents that coal and gas are throw out towards the working face or upper and lower crossheading in extremely short time along with coal recovery of working face and accompanying strongly noise, which severely threatens the secure production of coal mines.
In recent years, along with the improvement of the coal mines exploiting technical conditions, the methods of enhancing ventilation, ground pre-extraction, hydraulic fracturing and the like are mainly adopted aiming at the problems of gas outburst to reduce the threat of coal and gas outburst to the coal secure production; the above gas treatment technologies decrease the dangerousness caused by coal and gas outburst in certain degree, however, these treatment methods universally have certain limitation and dangerousness. For example, enhancing ventilation can merely ensure the concentration decrease of free gas in work surface or roadway, but cannot thoroughly eliminate the gas in coal layer; for the ground pre-extraction method, there are large volume of the work, low pertinence, and poor effect; for the common hydraulic fracturing mode artificial drilling is mainly adopted and then hydraulic fracturing is performed, and finally gas extraction is performed, this method mainly adopts water drilling to perform perforation, however, the hole depth and hole aperture for gas extraction are large, and
BL-5123 2 time-consuming is long, which increases the work amount of constructors, and the | viens security of constructors cannot be ensured effectively. Therefore, an improved technical scheme aiming at the above defects in the prior art need to be provided.
SUMMARY The purpose of the present invention is to overcome the limitations and dangers existing in some extent the phenomenon of larger amount of work, lower pertinence and inferior effect, and the problem that the constructors are easily exposed to the environment with gas and the security assurance for constructors is deficient when gas is extracted in the above prior art. In the present invention the methods of high pressure hydraulic perforation and high pressure hydraulic fracture are combined, and a certain outburst space is reserved for the gas in the coal body in the process of extraction, and then gas safety isolation airbag is arranged, to prevent the constructors from being exposed in environment with gas for a long time. In order to achieve the above purpose, following technical schemes are provided in the present invention. A method of unmanned gas extraction by hydraulic perforation, characterized in that the method of gas extraction comprises the following steps: step 1, high pressure hydraulic perforation comprising: perforating in the forward direction of the working face for tunneling in coal roadway via a high pressure hydraulic perforating gun to form a high pressure water perforation; step 2, crack initiation by high pressure hydraulic fracturing comprising: arranging a high pressure hydraulic fracturing gun in the high pressure water perforation formed in the step 1, fracturing the coal body around the high pressure water perforation to obtain multiple hydraulic fracturing cracks in the coal body via the high pressure hydraulic fracturing gun; and step 3, gas extraction: arranging a gas extraction pipe in the high pressure water perforation having the hydraulic fracturing cracks formed in the step 2,
BL-5123 3 multiple hydraulic fracturing cracks in step 2 being equal to the gas extraction” 9% channel, extracting the gas in the coal body of working face for tunneling in coal roadway via the gas extraction pipe arranged in gas extraction channel.
In the above-mentioned method of unmanned gas extraction by hydraulic perforation , preferably, the step 1 specifically comprises the following steps: step 1.1, primarily, adding water into fracturing abrasive on ground , mixing and agitating to obtain a mixed fracturing abrasive, subsequently, transporting the mixed fracturing abrasive into the roadway at which the working face for tunneling in coal roadway locates via a pipe by a high pressure pump; Step 1.2, connecting a feed pipe of the high pressure hydraulic perforating gun with the pipe for transporting the mixed fracturing abrasive, then fixing the high pressure hydraulic perforating gun onto the bottom plate of the roadway via a fixing device; primarily sealing and blocking the coal body on the central line of the roadway at which the working face for tunneling in coal roadway locates using a blocking material, subsequently aligning the muzzle of the high pressure hydraulic perforating gun with the central line of the roadway at which the working face for tunneling in coal roadway locates; then initiating the high pressure pump, aligning the fracturing mixed abrasive with the central line of the working face for tunneling in coal roadway via the high pressure hydraulic perforating gun and perforating under the sustained pressure of the high pressure pump to form the high pressure water perforation on the working face for tunneling in coal roadway; making the high pressure hydraulic perforating gun continuously follow up with the lengthening of the high pressure hydraulic perforation to form the high pressure hydraulic perforation with the length L; step 1.3, removing the high pressure hydraulic perforating gun from the working face for tunneling in coal roadway; the step 2 specifically comprises the following steps: step 2.1, connecting the high pressure hydraulic fracturing gun to the high pressure pump, and inserting the high pressure hydraulic fracturing gun into the deepest location of the high pressure water perforation in the step 1.2, and then
BL-5123 4 fixing the high pressure hydraulic fracturing gun onto the bottom plate of the 91694 roadway at which the working face for tunneling in coal roadway locates using the fixing device; step 2.2, performing hydraulic fracturing to the coal body in the high pressure water perforation by the high pressure water from the water outlet of the high pressure hydraulic fracturing gun to form the hydraulic fracturing cracks distributed radially along the high pressure water perforation; step 2.3, removing the hydraulic fracturing gun from the inner of the high pressure water perforation; the step 3 specifically comprises the following steps: step 3.1, inserting the gas extraction pipe into the bottom of the high pressure water perforation having the hydraulic fracturing cracks in the step 2.2; step 3.2, sealing and blocking the orifice of the high pressure water perforation again using the blocking material; step 3.3, arranging gas safety isolation airbag in the roadway at rear of working face for tunneling in coal roadway, making the gas extraction pipe pass through the gas safety isolation airbag, inflating air for the gas safety isolation airbag to make the gas safety isolation airbag cling to the side wall of the roadways; step 3.4, performing gas extraction via the gas extraction pipe using a gas extraction device at this point, the hydraulic fracturing fracture in the step 2 equals to the gas extraction channel, and the gas in working face for tunneling in coal roadway is extracted by gas extraction pipe along the gas extraction channel.
In the above-mentioned method of unmanned gas extraction by hydraulic perforation, preferably, the fracturing abrasive in the step 1.1 is quartz sand.
In the above-mentioned method of unmanned gas extraction by hydraulic perforation, preferably, the high pressure hydraulic perforating gun is of ®19, the high pressure hydraulic fracturing gun is of ®31.5mm.In the above-mentioned method of unmanned gas extraction by hydraulic perforation, preferably, the pressure of the high pressure hydraulic fracturing gun in the step 1.2 is 40-50MPa.
BL-5123 5 In the above-mentioned method of unmanned gas extraction by hydraulic: "91804 perforation, preferably, the length L in the step 1.2 is 75-85m.
The blocking material in both the step 1.2 and step 3.2 is a mixture of cement slurry and coagulation accelerator, and the length of the sealing and blocking in the step 3.2 is no less than 1/3 length of the high pressure water perforation.
In the above-mentioned method of unmanned gas extraction by hydraulic perforation, preferably, in the step 3.3, the distance between the gas safety isolation airbag and the working face for tunneling in coal roadway is 3-6m.
In the above-mentioned method of unmanned gas extraction by hydraulic perforation, preferably, a high pressure hydraulic perforation system adopted in the step 1 comprises: a high pressure pump, a high pressure water pipe, a fixing device, a high pressure hydraulic perforating gun, a blocking material and mixed fracturing abrasive, the high pressure pump is arranged onto the bottom plate of a roadway and is connected to the high pressure water pipe, the high pressure water pipe is full of the mixed fracturing abrasive and is connected to the high pressure hydraulic perforating gun, the high pressure hydraulic perforating gun is fixed onto the bottom plate of the roadway via the fixing device and aligns the coal body on the central line of the roadway at which the working face for tunneling in coal roadway locates, the junction between the high pressure hydraulic perforating gun and the coal body is blocked by the blocking material; a system of fracture initiation by high pressure hydraulic fracturing adopted in the step 2 comprises: a high pressure pump, a high pressure water pipe, a fixing device, a high pressure hydraulic fracturing gun and a blocking material, the high pressure pump is arranged on the bottom plate of the roadway, and is connected to the high pressure water pipe, the high pressure water pipe is connected to the high pressure hydraulic fracturing gun, the high pressure hydraulic fracturing gun is fixed onto the bottom plate of the roadway via the fixing device, the high pressure water from the water outlet of the high pressure hydraulic fracturing gun aligns the coal body in the high pressure water perforation, and the junction between the high pressure hydraulic fracturing gun
BL-5123 6 and the coal body is blocked synchronously by the blocking material; and HU107604 a gas extraction system adopted in the step 3 comprises: a gas extraction pipe, a gas safety isolation airbag and a blocking material, the gas safety isolation airbag is arranged in the roadway at the rear of the working face for tunneling in coal roadway and is against the side wall of roadway, the gas extraction pipe penetrates the gas safety isolation airbag and is inserted into the high pressure hydraulic perforation with hydraulic fracturing crack, the junction between the gas extraction pipe and the coal body is synchronously blocked by the blocking material.
In the above-mentioned method of unmanned gas extraction by hydraulic perforation, preferably, an elastic gas extraction pipe channel is arranged at the middle of the gas safety isolation airbag, the gas extraction pipe penetrates the gas safety isolation airbag via the gas extraction pipe channel.
Compared with the closest prior art, the technical schemes provided in the present invention have the following advantageous effects: In the present invention, hydraulic perforation and hydraulic fracture technologies are combined, and the way of high pressure hydraulic perforation and high pressure hydraulic fracture is adopted in the process of tunneling in coal roadway or rock cross-cut coal uncovering, releasing the gas in the working face coal body in advance, changing the mechanical environment of coal body, increasing the air permeability of coal body, decreasing the strength of coal body, and achieving the technical effect of pressure relief and outburst prevention. Meanwhile, the hydraulic perforating of the present invention is fast dramatically decreases the workload of drilling, hydraulic fracturing makes the air permeability of coal body increase, gas extraction effect is enhanced. The gas extraction system of the present invention enhances the work efficiency in the process of roadway tunneling and rock cross-cut coal uncovering, decreases the workload of constructors, and ensures the safety of the constructors. As compared with the prior technical schemes, the present invention has the characteristics of low cost,
BL-5123 7 construction safety, easy operation, small amount of work and the like, and the 91694 gas in the coal body which is in front of tunneling working face and in front of rock cross-cut coal uncovering can be extracted safely, efficiently and fast. Brief Description of the Drawings Figure 1 is the schematic diagram of the process of the high pressure hydraulic perforation in the examples of the present invention; Figure 2 is the schematic diagram of the process of the fracture initiation by high pressure hydraulic fracturing in the examples of the present invention; Figure 3 is the schematic diagram of the process of gas extraction in the examples of the present invention; Figure 4 is the structural schematic diagram of the gas safety isolation airbag of figure 3.
In the Figures: 1. high pressure pump; 2. roadway; 3. high pressure water pipe; 4. fixing device; 5. high pressure hydraulic perforating gun; 6. working face for tunneling in coal roadway; 7. high pressure water perforation; 8. high pressure hydraulic fracturing gun; 9. water outlet of hydraulic fracturing gun; 10. hydraulic fracturing crack; 11. gas extraction pipe; 1101. gas extraction pipe channel; 12. gas safety isolation airbag; 13. gas extraction channel; and 14. blocking material.
Detailed Description of the Embodiments The technical schemes in the examples of the present invention will be described clearly and entirely below, obviously, the described examples are merely a part of examples of the present invention, rather than all examples. All other embodiments obtained by a person skilled in the art on the basis of the examples in the present invention belong to the scope protected by the present invention.
The present invention will be described in details below with reference to drawings in combination with examples. What needs to be stated is that the examples as well as the features in the examples in the present application can be combined one another under the condition without conflict.
BL-5123 8 In the description of the present invention, the indicated direction or position 01604 relationships are shown on the basis of drawings, which are merely for the purpose of describing the present invention conveniently but not requiring that the present invention must be constructed and operated in the specific orientation and thus shall not be understood as the limitation to the present invention. The terms “joint” and “connection” used in the present invention shall be generally understood, for example, they may be either detachable connection or fixed connection; and may be either direct connection or indirect connection via intermediate component(s); as to a person skilled in the art, the concrete meaning of the above terms may be understood according to specific condition(s).
As shown in Figures 1-4, the present invention provides a method of unmanned gas extraction by hydraulic perforation, the method of gas extraction comprises the following steps: Step 1, high pressure hydraulic perforation: perforating on the working face for tunneling in coal roadway 6 via a high pressure hydraulic perforating gun 5 to form a high pressure water perforation 7, a high pressure hydraulic perforating gun 5 of ®19mm is adopted in this example.
Step 1 specifically comprises the following steps: Sep 1.1, primarily, adding water into fracturing abrasive on ground , mixing and agitating to obtain a mixed fracturing abrasive, subsequently, transporting the mixed fracturing abrasive into the roadway 2 at which the working face for tunneling in coal roadway 6 locates via a pipe by a high pressure pump 1, the fracturing abrasive is quartz sand in this example.
Step 1.2, connecting a feed pipe of the high pressure hydraulic perforating gun 5 with the pipe for transporting the mixed fracturing abrasive, then, fixing the high pressure hydraulic perforating gun 5 onto the bottom plate of the roadway 2 via a fixing device 4; primarily sealing and blocking the coal body on the central line of the roadway 2 at which the working face for tunneling in coal roadway 6 locates using a blocking material 14, and aligning the muzzle of the high pressure hydraulic perforating gun 5 with the central line of the roadway 2 at which the
BL-5123 9 working face for tunneling in coal roadway 6 locates; then initiating the high 0199 pressure pump 1, aligning fracturing mixed abrasive with the central line of the working face for tunneling in coal roadway 6 via the high pressure hydraulic perforating gun 5 and perforating under the sustained pressure of the high pressure pump 1; the pressure of the high pressure hydraulic perforating gun 5 is 40-50MPa; under the high frequency impact of the mixed abrasive carried by high speed fluid, the coal body on the working face for tunneling in coal roadway 6 is worn and cut, thereby a high pressure water perforation 7 is formed on the working face for tunneling in coal roadway 6; the high pressure hydraulic perforating gun 5 continuously follows up with the lengthening of the high pressure hydraulic perforation, and the high pressure hydraulic perforation with the length L being 75-85m is formed, the length L may be 75m, 76m, 77m, 78m, 79m, 80m, 81m, 82m, 83m, 84m, the length L is preferably 80m in this example. Step 1.3, removing the high pressure hydraulic perforating gun 5 from the working face for tunneling in coal roadway 6. A high pressure hydraulic perforation system adopted in the above steps comprises: a high pressure pump 1, a high pressure water pipe 3, a fixing device 4, a high pressure hydraulic perforating gun 5, a blocking material 14 and mixed fracturing abrasive, the high pressure pump 1 is arranged onto the bottom plate of a roadway 2 and is connected to the high pressure water pipe 3, the high pressure water pipe 3 is full of the mixed fracturing abrasive and is connected to the high pressure hydraulic perforating gun 5, the high pressure hydraulic perforating gun 5 is fixed onto the bottom plate of the roadway 2 via the fixing device 4 and aligns the coal body in the central line of the roadway 2 at which the working face for tunneling in coal roadway 6 locates, the junction of the high pressure hydraulic perforating gun 5 and the coal body is blocked by the blocking material
14. Step 2, fracture initiation by high pressure hydraulic fracturing: arranging a high pressure hydraulic fracturing gun 8 in the high pressure water perforation 7 formed in step 1, and arranging a plurality of water outlets of hydraulic fracturing
BL-5123 10 gun 9 on the high pressure hydraulic fracturing gun 8 along the length direction 0'994 thereof. Fracturing the coal body around the high pressure water perforation 7 to obtain a hydraulic fracturing crack 10.
Step 2 specifically comprises the following steps: Step 2.1, connecting the high pressure hydraulic fracturing gun 8 to the high pressure pump 1, and inserting the high pressure hydraulic fracturing gun 8 into the deepest location of the high pressure water perforation 7 in step 1.2, and then fixing the high pressure hydraulic fracturing gun 8 onto the bottom plate of the roadway 2 at which the working face for tunneling in coal roadway 6 locates using the fixing device 4, the high pressure hydraulic fracturing gun 8 of ®31.5mm is adopted in this example.
Step 2.2, performing hydraulic fracturing to the coal body in the high pressure water perforation 7 by the high pressure water from the water outlet of hydraulic fracturing gun 9 of the high pressure hydraulic fracturing gun 8 to form the hydraulic fracturing crack 10 distributed radially along the high pressure water perforation 7, the pressure of the high pressure hydraulic fracturing gun 8 is 40-50MPa.
A system of fracture initiation by high pressure hydraulic fracturing adopted in the above steps comprises: a high pressure pump 1, a high pressure water pipe 3, a fixing device 4, a high pressure hydraulic fracturing gun 8 and a blocking material 14, the high pressure pump 1 is arranged on the bottom plate of the roadway 2 and is connected to the high pressure water pipe 3, the high pressure water pipe 3 is connected to the high pressure hydraulic fracturing gun 8, the high pressure hydraulic fracturing gun 8 is fixed onto the bottom plate of the roadway 2 via the fixing device 4, the high pressure water from the water outlet of the high pressure hydraulic fracturing gun 8 aligns the coal body in the high pressure water perforation 7, and the junction of the high pressure hydraulic fracturing gun 8 and the coal body are blocked synchronously by the blocking material 14.
Step 2.3, removing the hydraulic fracturing gun from the inner of the high pressure water perforation 7.
BL-5123 11 Step 3, gas extraction: arranging the gas extraction pipe 11 in the high ©1604 pressure water perforation 7 having the hydraulic fracturing crack 10 formed in step 2, which equals to the gas extraction channel 13, extracting the gas in the coal body of working face for tunneling in coal roadway 6 using the gas extraction pipe 11 via the gas extraction channel 13.
Step 3 specifically comprises the following steps: Step 3.1, inserting the gas extraction pipe 11 into the bottom of the high pressure water perforation 7 having the hydraulic fracturing crack 10 in step 2.2, the gas extraction pipe 11 is a part of the gas extraction device, the gas extraction pipe 11 of type DN300 is adopted in this example.
Step 3.2, sealing and blocking the orifice of the high pressure water perforation 7 using the blocking material 14, the blocking material 14 used in this example is a mixture of cement slurry and coagulation accelerator, and the length of the sealing and blocking is no less than 1/3 length of the high pressure water perforation 7, the distance between the gas safety isolation airbag 12 and the working face for tunneling in coal roadway 6 is 3-6m, this distance can be 3m,
3.5m, 4m, 4.5m, 5m, 5.5m, 6m and is preferably 5m in this example; the gas safety isolation airbag 12 is mainly used for blocking gas of coal mining working face and there is corresponding application in large state-owned coal mines at present; The distance between gas safety isolation airbag 12 and coal body are 5m, in order to reserve a certain buffer space for the gas outburst from coal body, and weaken the impact force of the gas on the gas safety isolation airbag 12 when gas bursts out from coal body; and gas safety isolation airbag 12 in this example has top edge thereon, the top edge clings on the side wall of roadway 2, and the top edge extends towards the advance direction of the coal mine tunneling working face, making the air tightness of gas safety isolation airbag better and decreasing the leaking of the gas from the junction between gas safety isolation airbag 12 and | the side wall of the roadway 2. Step 3.3, arranging gas safety isolation airbag 12 in the roadway 2 at rear of working face for tunneling in coal roadway 6, making gas extraction pipe 11 pass
BL-5123 12 through the gas safety isolation airbag 12, inflating for the gas safety isolation 01°04 airbag 12 to make the gas safety isolation airbag 12 cling to the side wall of the roadway 2; arranging an elastic gas extraction pipe 11 channel at the middle of gas safety isolation airbag 12; gas extraction pipe 11 penetrates the gas safety isolation airbag 12 via gas extraction pipe 11 channel, the gas safety isolation airbag 12 is used to form a relatively confined space between the airbag and coal roadway working face, so that the gas in coal body of coal roadway working face can be completely extracted by gas extraction pipe 11, without leaking to the outside. In addition, arranging an elastic gas extraction pipe channel 1101 at the middle of the gas safety isolation airbag 12, the gas extraction pipe 11 pass through the gas safety isolation airbag 12 via the gas extraction pipe channel 1101, the sealing of the junction between the gas extraction pipe 11 and gas safety isolation airbag 12 is better after gas extraction pipe 11 pass through the gas safety isolation airbag 12, further decreasing the leakage of the gas.
Step 3.4, performing gas extraction via gas extraction pipe 11 using gas extraction device, at this point, the hydraulic fracturing crack 10 equals to the gas extraction channel 13, and the gas in working face for tunneling in coal roadway 6 is extracted by gas extraction pipe 11 along the gas extraction channel 13.
The gas extraction system adopted in the above steps comprises: a gas extraction pipe 11, a gas safety isolation airbag 12 and a blocking material 14, the gas safety isolation airbag 12 is arranged in the roadway 2 at the rear of the working face for tunneling in coal roadway 6 and clings on the side wall of roadway 2, the gas extraction pipe 11 penetrates the gas safety isolation airbag 12 and is inserted into the high pressure hydraulic perforation with hydraulic fracturing crack 10, the junction between the gas extraction pipe 11 and the coal body is synchronously blocked by the blocking material 14.
The same kind of the fixing device 4 is used for fixing the high pressure hydraulic perforating gun 5 and the high pressure hydraulic fracturing gun 8 in the above steps, the fixing device 4 comprises: a supporting leg, a fixed bracket, A holder;
BL-5123 13 the supporting leg is rod shape, the lower end of the supporting leg is fixed "01608 onto the bottom plate of the roadway 2and the upper end of the supporting leg is disposed with the fixed bracket; the fixed bracket is disposed on the upper end of the supporting leg and is disc shape with groove in the middle thereof, a high pressure hydraulic perforating gun 5 and a high pressure hydraulic fracturing gun 8 are placed in the groove of the fixed bracket, making the placement of the high pressure hydraulic perforating gun 5 and the high pressure hydraulic fracturing gun 8 more stable.
the upper end of the holder is articulated obliquely on the upper portion of the supporting leg, the holder is distributed evenly around the supporting leg, the lower end of the holder and the lower end of the supporting leg are located onto a same plane, the outrigger is used as the support rod of main support, the holder being articulated obliquely on the supporting leg and the supporting leg form one circular section in the cross section, supporting of which is more stable.
To sum up, the technical schemes of the present invention also have the following beneficial technical effects: In the present invention, combines hydraulic perforation and hydraulic fracture technologies are combined, and the way of high pressure hydraulic perforation and high pressure hydraulic fracture is adopted in the process of tunneling in coal roadway or rock cross-cut coal uncovering, releasing the gas in the working face coal body in advance, changing the mechanical environment of coal body, increasing the air permeability of coal body, decreasing the strength of coal body, and achieving the technical effect of pressure relief and outburst prevention. Meanwhile, the hydraulic perforating of the present invention is fast and dramatically decreases the workload of drilling, | hydraulic fracturing makes the air permeability of coal body increase, gas extraction effect is enhanced. When the present invention is specifically implemented, the constructors can leave the site after gas extraction pipe 11 and gas safety isolation airbag 12 are well arranged, avoiding the constructors from being exposed in gas environment, and thus protecting the safety of constructors.
Moreover, blocking material 14 is adopted to perform the blocking to perforation
BL-5123 14 in both the processes of hydraulic perforation and hydraulic fracture so as to avoid 01604 part of gas leaking out. The gas extraction system of the present invention enhances the work efficiency in the process of tunneling in roadway 2 and rock cross-cut coal uncovering, decreases the workload of constructors, and ensures the safety of the constructors. As compared with the prior technical schemes, the present invention has the characteristics of low cost, construction safety, easy operation, small amount of work and the like, and the gas in the coal body which is in front of extraction tunneling working face and in front of rock cross-cut coal uncovering can be extracted safely, efficiently and fast.
What mentioned above are merely preferable embodiment(s) of the present invention and are not used to limit the present invention. Any amendment(s), equivalent substitution(s), improvement(s) and the like made within the spirit and principle of the present invention shall fall in the protection scope of the claims to be examined and approved.
Claims (9)
1. A method of hydraulic perforation unmanned gas extraction, characterized in that the method comprises: step 1, high pressure hydraulic perforation comprising: performing a perforation in the forward direction of the working face for tunneling in coal roadway via a high pressure hydraulic perforating gun to form a high pressure water perforation; wherein the step 1 specifically comprises: step 1.1, primarily, adding water into fracturing abrasive on ground, mixing and agitating, to obtain a mixed fracturing abrasive, subsequently, transporting the mixed fracturing abrasive into the roadway at which the working face for tunneling in coal roadway locates via a pipe by a high pressure pump; step 1.2, connecting a feed pipe of the high pressure hydraulic perforating gun with the pipe for transporting the mixed fracturing abrasive, then fixing the high pressure hydraulic perforating gun onto the bottom plate of the roadway via a fixing device; sealing and blocking the coal body on the central line of the roadway at which the working face for tunneling in coal roadway locates using a blocking material, subsequently aligning the muzzle of the high pressure hydraulic perforating gun with the central line of the roadway at which the working face for tunneling in coal roadway locates; then initiating the high pressure pump, aligning fracturing mixed abrasive with the central line of the working face for tunneling in coal roadway via the high pressure hydraulic perforating gun and perforating under the sustained pressure of the high pressure pump to form the high pressure water perforation on the working face for tunneling in coal roadway; making the high pressure hydraulic perforating gun continuously follow up with the lengthening of the high pressure hydraulic perforation to form the high pressure hydraulic perforation with the length L; step 1.3, removing the high pressure hydraulic perforating gun from the working face for tunneling in coal roadway; step 2, crack initiation by high pressure hydraulic fracturing comprising:
BL-5123 16 arranging a high pressure hydraulic fracturing gun in the high pressure water oo perforation formed in the step 1, fracturing the coal body around the high pressure water perforation to obtain multiple hydraulic fracturing cracks in the coal body via the high pressure hydraulic fracturing gun; wherein the step 2 specifically comprises: step 2.1, connecting the high pressure hydraulic fracturing gun to the high pressure pump, and inserting the high pressure hydraulic fracturing gun into the deepest location of the high pressure water perforation in the step 1.2, and then fixing the high pressure hydraulic fracturing gun onto the bottom plate of the roadway at which the working face for tunneling in coal roadway locates using the fixing device; step 2.2, performing hydraulic fracturing to the coal body in the high pressure water perforation by the high pressure water from the water outlet of the high pressure hydraulic fracturing gun to form the hydraulic fracturing cracks distributed radially along the high pressure water perforation; step 2.3, removing the hydraulic fracturing gun from the inner of the high pressure water perforation; step 3, gas extraction comprising: arranging a gas extraction pipe in the high pressure water perforation having the hydraulic fracturing cracks formed in the step 2, wherein multiple hydraulic fracturing cracks in the step 2 equal to the gas extraction channels, extracting the gas in the coal body of working face for tunneling in coal roadway via the gas extraction pipe arranged in the gas extraction channels; wherein the step 3 specifically comprises: step 3.1, inserting the gas extraction pipe into the bottom of the high pressure water perforation having the hydraulic fracturing cracks in the step 2.2; step 3.2, sealing and blocking the orifice of the high pressure water perforation again using the blocking material, step 3.3, arranging gas safety isolation airbag in the roadway at rear of working face for tunneling in coal roadway, making the gas extraction pipe pass through the gas safety isolation airbag, inflating air for the gas safety isolation
| BL-5123 17 airbag to keep the gas safety isolation airbag close to the side wall of the roadway: | 07604 step 3.4, performing gas extraction via the gas extraction pipe using gas extraction device, at this point, the hydraulic fracturing cracks in the step 2 equals to the gas extraction channels, the gas in working face for tunneling in coal roadway is extracted by gas extraction pipe along the gas extraction channel.
2. The method of hydraulic perforation unmanned gas extraction according to claim 1, characterized in that the fracturing abrasive in the step 1.1 is quartz sand.
3. The method of hydraulic perforation unmanned gas extraction according to claim 1, characterized in that the high pressure hydraulic perforating gun is of ®19 mm, the high pressure hydraulic fracturing gun is of ®31.5mm.
4. The method of hydraulic perforation unmanned gas extraction according to claim 1, characterized in that the pressure of the high pressure hydraulic fracturing gun in the step 1.2 is 40-50MPa.
5. The method of hydraulic perforation unmanned gas extraction according to claim 1, characterized in that the length L in the step 1.2 is 75-85m.
6. The method of hydraulic perforation unmanned gas extraction according to claim 1, characterized in that the blocking material in both the step 1.2 and step
3.2 is a mixture of cement slurry and coagulation accelerator, and the length of the sealing and blocking in the step 3.2 is no less than 1/3 length of the high pressure water perforation .
7. The method of hydraulic perforation unmanned gas extraction according to claim 1, characterized in that, in the step 3.3, the distance between the gas safety isolation airbag and the working face for tunneling in coal roadway is 3-6m.
8. The method of hydraulic perforation unmanned gas extraction according to claim 1, characterized in that a high pressure hydraulic perforation system adopted in the step 1 comprises: a high pressure pump, a high pressure water pipe, a fixing device, a high pressure hydraulic perforating gun, a blocking material and mixed fracturing abrasive; wherein the high pressure pump is arranged onto the
BL-5123 18 bottom plate of a roadway and is connected to the high pressure water pipe, the high pressure water pipe is full of the mixed fracturing abrasive and is connected to the high pressure hydraulic perforating gun, the high pressure hydraulic perforating gun is fixed onto the bottom plate of the roadway via the fixing device, and is aligned with the coal body on the central line of the roadway at which the working face for tunneling in coal roadway locates, the Junction of the high pressure hydraulic perforating gun and the coal body is blocked by the blocking material; a system of crack initiation by high pressure hydraulic fracturing adopted in the step 2 comprises: a high pressure pump, a high pressure water pipe, a fixing device, a high pressure hydraulic fracturing gun and a blocking material, the high pressure pump is arranged on the bottom plate of the roadway and is connected to the high pressure water pipe, the high pressure water pipe is connected to the high pressure hydraulic fracturing gun, the high pressure hydraulic fracturing gun is fixed onto the bottom plate of the roadway via the fixing device, the high pressure water from the water outlet of the high pressure hydraulic fracturing gun is aligned with the coal body in the high pressure water perforation, and the junction of the high pressure hydraulic fracturing gun and the coal body is blocked synchronously by the blocking material; and a gas extraction system adopted in the step 3 comprises: a gas extraction pipe, a gas safety isolation airbag and a blocking material, the gas safety isolation airbag is arranged in the roadway at the rear of the working face for tunneling in coal roadway, the gas safety isolation airbag is against the side wall of roadway, the gas extraction pipe passes through the gas safety isolation airbag and is inserted into the high pressure hydraulic perforation with hydraulic fracturing cracks, the junction of the gas extraction pipe and the coal body is synchronously blocked by the blocking material.
9. The method of hydraulic perforation unmanned gas extraction according to claim 1, characterized in that an elastic gas extraction pipe channel is arranged at the middle of the gas safety isolation airbag, the gas extraction pipe passes
BL-5123 19 ee css Er 7222222 rer
. . . . . . LU101604 through the gas safety isolation airbag via the gas extraction pipe channel.
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| CN201810761383.2A CN108678804B (en) | 2018-07-03 | 2018-07-03 | Hydraulic perforation unmanned gas extraction method |
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| CN114109337B (en) * | 2021-11-26 | 2023-09-19 | 中煤科工集团重庆研究院有限公司 | Self-adaptive grooving method and system for coal mine underground gas extraction drilling hole sealing section |
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| CN2195620Y (en) * | 1994-02-26 | 1995-04-26 | 杜志刚 | Fast-filling air partition |
| RU2298650C1 (en) * | 2005-10-11 | 2007-05-10 | Государственное образовательное учреждение высшего профессионального образования "Московский государственный горный университет" (МГГУ) | Coal formation hydraulic processing method |
| US20090071640A1 (en) * | 2007-09-17 | 2009-03-19 | Anatoliy Nikolayevich Ivanov | Device for cutting a vertical slot-like unloading opening |
| CN101457640B (en) * | 2007-12-14 | 2012-03-14 | 中国石油大学(北京) | Abradant jet downhole perforation, and kerf multiple fracturing method |
| CN101403314B (en) * | 2008-11-18 | 2011-03-23 | 河南理工大学 | Coal mine down-hole drilling hydraulic fracturing anti-reflection mash gas extraction technique |
| CN102071920B (en) * | 2010-12-30 | 2013-01-23 | 河南理工大学 | Gas extraction equipment and method for low permeability coal bed gas |
| RU2012121635A (en) * | 2012-05-25 | 2013-11-27 | Общество с ограниченной ответственностью "Газпром добыча Кузнецк" | METHOD FOR EXTRACTION OF METHANE FROM COAL LAYER |
| CN103174453A (en) * | 2013-03-28 | 2013-06-26 | 重庆大学 | Layered hydraulic fracturing method of underground coal mine multiple coal seams |
| CN103195468A (en) * | 2013-04-02 | 2013-07-10 | 重庆市能源投资集团科技有限责任公司 | System process for conducting efficient strengthened extraction in surrounding rock |
| CN105971662A (en) * | 2016-07-05 | 2016-09-28 | 重庆大学 | Method for gas extraction by coal seam roof weakening through L-shaped drilling staged fracturing |
| CN106285601A (en) * | 2016-08-12 | 2017-01-04 | 中国石油集团渤海钻探工程有限公司 | Cave and fracturing integrated yield-increasing technique method are made in the injection of coal bed gas well abrasive perforating |
| CN108678804B (en) * | 2018-07-03 | 2020-06-16 | 安徽理工大学 | Hydraulic perforation unmanned gas extraction method |
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| CN108678804A (en) | 2018-10-19 |
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