CN114370272B - Directional hydraulic roof cutting method and device thereof - Google Patents
Directional hydraulic roof cutting method and device thereof Download PDFInfo
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- CN114370272B CN114370272B CN202111655560.7A CN202111655560A CN114370272B CN 114370272 B CN114370272 B CN 114370272B CN 202111655560 A CN202111655560 A CN 202111655560A CN 114370272 B CN114370272 B CN 114370272B
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- 238000005520 cutting process Methods 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 134
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 56
- 238000005553 drilling Methods 0.000 claims abstract description 49
- 239000011435 rock Substances 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 239000002775 capsule Substances 0.000 claims description 26
- 238000010276 construction Methods 0.000 claims description 15
- 230000000694 effects Effects 0.000 claims description 14
- 238000003823 mortar mixing Methods 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 7
- 208000008918 voyeurism Diseases 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 3
- 239000003245 coal Substances 0.000 abstract description 5
- 238000009792 diffusion process Methods 0.000 abstract description 5
- 238000005065 mining Methods 0.000 abstract description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000005422 blasting Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000243 solution Substances 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
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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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
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
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- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Remote Sensing (AREA)
- Mechanical Engineering (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Earth Drilling (AREA)
Abstract
The invention belongs to the technical field of coal mining, and discloses a directional hydraulic roof cutting method, which comprises the following specific operation steps: s1, detecting production geological conditions of a working face, and analyzing and judging positions of key rock layers of a top plate; s2, designing parameters such as hydraulic topping direction, range and the like according to the result of geological condition detection of the working face production; s3, roof cutting and drilling are constructed according to roof cutting parameters; and then carrying out directional hydraulic topping work according to the designed parameters. The invention adopts a complete set of directional hydraulic roof cutting device, including a slotting and fracturing integrated device, a high-pressure double-layer drill rod, a high-pressure mortar water jet device and the like, adopts a directional hydraulic roof cutting method, and makes high-pressure water split and diffuse rock strata along two slot directions by prefabricating slot on the inner wall of a roof cutting drill hole, thereby effectively solving the problem of uncertain hydraulic roof cutting diffusion range, achieving the purpose of directional hydraulic roof cutting, and having great significance for controlling the mining pressure influence of a working face.
Description
Technical Field
The invention belongs to the technical field of coal mining, and particularly relates to a directional hydraulic roof cutting method and a device thereof.
Background
In the coal mining process, the coal seam roof often presents hard rock strata which have large hardness and large layering thickness, and the rock strata are extremely difficult to fall off after the working face is mined, so that a suspended roof is easy to form; when the suspended roof is too large, the gas at the corners of the working face is extremely easy to overrun; if the large-area suspended roof suddenly collapses, disasters such as hurricanes and the like are easy to cause; the suspended roof can apply additional stress to the roadway and the roadway protection coal pillars, so that the roadway support system is affected, the roadway is deformed, and the normal production of the working face is seriously affected.
The existing roof cutting and pressure relief methods are generally deep hole presplitting blasting technology and hydraulic fracturing technology, and the deep hole presplitting blasting needs a professional blasting device and is inconvenient to operate; however, in practical application, the hydraulic fracturing technology is affected by the ground stress and the state of the roof strata, the hydraulic fracturing direction and the diffusion range are uncertain, and the hydraulic fracturing roof cutting effect is affected.
At present, regarding a hydraulic roof cutting method, high-pressure water is diffused near a fracturing point during fracturing, so that annular structural weaknesses are formed along the periphery of the fracturing point, roof strata are weakened, and the aim of roof cutting and pressure relief is fulfilled; however, in the fracturing process, the diffusion direction of high-pressure water cannot be controlled, and the hydraulic roof cutting effect is often not ideal.
Therefore, a method for ensuring the diffusion of the hydraulic topping according to the design direction needs to be studied.
Disclosure of Invention
The invention aims to solve the problems, and provides a method and a device for directional hydraulic topping, which are used for solving the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: a method for directional hydraulic topping specifically comprises the following operation steps:
S1, detecting production geological conditions of a working face, and analyzing and judging positions of key rock layers of a top plate;
S2, designing parameters such as a topping direction, a range and the like according to the result of geological condition detection of the working face production;
s3, roof cutting and drilling are constructed according to roof cutting parameters;
S4, feeding the slotting and fracturing integrated device into a first slotting point in the designed drilling hole, and slotting the inner wall of the drilling hole at the slotting point by using high-pressure mortar water jet;
s5, carrying out fracturing construction on the slit point where the slit is completed, and completing directional hydraulic roof cutting operation of the first slit point;
S6, moving the slotting and fracturing integrated device to a second slotting point of the drilling hole, and performing directional hydraulic topping operation;
s7, repeating the steps of S4-S5, and performing directional hydraulic roof cutting construction of the third slotting point and the nth slotting point of the fourth slotting point … until the directional hydraulic roof cutting construction of the drilling hole is completed;
S8, checking a directional hydraulic roof cutting effect by adopting a drilling peeping method, and if the designed roof cutting effect is achieved, continuing to perform directional hydraulic roof cutting by adopting the parameter until all the construction is completed; if the designed topping effect is not achieved, re-analyzing and selecting topping parameters and the like until the designed topping effect is achieved.
The geological conditions of the roof cutting area are determined in advance, the basic conditions of the roof cutting area are determined, the safety and feasibility of subsequent work are guaranteed, the directional hydraulic roof cutting parameters including roof cutting direction, range and drilling parameters are analyzed and designed through combination of the determined parameters and the actual conditions, the subsequent fracturing parameters are determined, then roof cutting drilling is constructed according to the pre-designed parameters, a slot is formed in the inner wall of the drilling hole at a slot point, high-pressure water is used for fracturing the slot point, continuously injected high-pressure water acts on the inner wall of the drilling hole, stress concentration is formed near the slot due to the fact that the inner wall of the drilling hole at the slot is damaged, and when the pressure of the high-pressure water is larger than the sum of the tensile strength of the rock stratum and the maximum principal stress and the minimum principal stress difference value, the high-pressure water is split and spread along the two slot directions, so that the purpose of directional hydraulic roof cutting is achieved.
As a preferred embodiment of the present invention, the detecting geological conditions of the working surface in step S1 includes, but is not limited to: testing physical and mechanical properties of the roof strata, analyzing the structure of the roof strata, testing ground stress and the like;
The physical and mechanical property test of the roof strata adopts roof drilling coring, and tests a coring sample to analyze the strength of the roof strata and the position of the hard strata; the roof stratum structure is mainly obtained by peeping a roof drilling hole, and the state of the roof stratum and the crack development condition are analyzed; comprehensively obtaining the positions of the top plate key layers with high strength and large layering thickness; the ground stress test can obtain the direction and the magnitude of the maximum main stress and the minimum main stress.
The invention also provides a directional hydraulic roof cutting device, which comprises a slotting and fracturing integrated device, wherein the slotting and fracturing integrated device comprises two expansion capsules and a cutting device, the outer ends of the cutting devices are respectively provided with the expansion capsules, one ends of the cutting devices are in threaded connection, and the other ends of the cutting devices are in sealing ring connection; the cutting device is an inner-outer double-layer pipeline, metal shells are fixedly arranged at the head end and the tail end of the two expansion capsules, an inner-layer high-pressure mortar water jet pipeline is arranged at the inner side of the two expansion capsules, a rubber expansion body is arranged at the outer side of the two expansion capsules, a high-pressure mortar water jet nozzle connected with the high-pressure mortar water jet pipeline is arranged in the middle of the cutting device, and a fracturing high-pressure water outlet channel is arranged at the outer edge of the nozzle; the bottom thread of the metal shell is connected with a double-layer drill rod at the tail end of the expansion capsule, the double-layer drill rod is divided into an inner layer and an outer layer, the inner layer and the outer layer of the double-layer drill rod respectively correspond to an inner layer high-pressure mortar water jet pipeline and an outer layer pipeline, and an inner pipe high-pressure mortar water jet connector and an outer pipe wind-water connector are arranged at the tail end of the double-layer drill rod connected with an outer cone power connector of the drilling machine.
As a preferable technical scheme of the invention, the air-water joint and the outer layer pipeline are an air pipe joint and an outer layer compressed air pipeline in the process of slotting, and a high-pressure water joint and an outer layer high-pressure water pipeline in the process of fracturing.
As a preferable technical scheme of the invention, the fracturing injection integrated device has the same structure along the longitudinal middle axial surface of the cutting device, namely, the two ends of the longitudinal middle axial surface of the high-pressure mortar water jet nozzle area.
As a preferable technical scheme of the invention, the high-pressure mortar water jet is formed by mixing a high-pressure mortar water jet device, the high-pressure mortar water jet device comprises a high-pressure water pump, a high-pressure mortar mixing device and a high-pressure water pipe, the high-pressure water enters the high-pressure mortar mixing device to form the high-pressure mortar water jet, and the high-pressure mortar water jet is ejected from a high-pressure mortar water jet nozzle through an inner pipe of a double-layer drill pipe to slit the inner wall of a drill hole to form a slit groove.
Aiming at the step S4, the slotting and fracturing integrated device is sent into a first slotting point in a drill hole, and the high-pressure mortar water jet is used for slotting the inner wall of the drill hole at the slotting point: the process flow comprises the following steps: the tail part of the slotting and fracturing integrated device is connected with a double-layer drill rod, the integrated device is fed into a slotting point in a drilling hole one by a drilling machine, and the drill rod at the bottommost part is the drill rod connected with an outer cone power joint of the drilling machine; connecting a high-pressure water pump with a water inlet of a high-pressure mortar mixing device, connecting a water outlet with a high-pressure mortar water jet connector at the tail part of a drill rod connected with an outer cone power connector by adopting a straight-through connection, opening the high-pressure mortar mixing device, jetting a high-pressure mortar water jet through a two-way high-pressure mortar water jet nozzle arranged on a cutting device, acting on the inner wall of a drill hole, cutting the inner wall of the drill hole, and controlling the up-and-down movement of an integrated device by using a drilling machine to form a slit groove; at the moment, the air-water joint is connected with the air pressing pipe through a straight way, so that the slotting efficiency can be improved when the high-pressure mortar water jet slots the inner wall of the drill hole; the length of the cutting slot is smaller than that of the cutting device.
Aiming at the hydraulic fracturing construction of the fracturing point with the cut in the step S5, the directional hydraulic fracturing of the first fracturing point is completed, and the process flow is as follows: after slotting is completed, the high-pressure mortar mixing device and the air pipe are closed, the integral device is moved to enable the slotting groove to be located at the middle position of the integral device, then a double-layer drill rod in a roadway is fixed, the high-pressure water pipe is connected with an air-water joint at the moment, a high-pressure water pump is opened, high-pressure water enters the integral device through an outer layer pipe of the double-layer drill rod, an expansion capsule is expanded to become an expansion capsule after high-pressure water injection, the integral device is fixed in a drilling hole, a temporary airtight space is formed between the two expansion capsules after high-pressure water injection, high-pressure water is continuously injected, the high-pressure water enters the drilling hole through a high-pressure water outlet channel at the outer edge of a nozzle of the cutting device, the high-pressure water continuously acts on the inner wall of the drilling hole, stress concentration is formed near the slotting groove, and when the pressure of the high-pressure water is larger than the sum of the tensile strength of a rock stratum, the maximum main stress and the minimum main stress difference value, the high-pressure water is split along two slotting directions, and the purpose of directional water fracturing is achieved.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts a complete set of directional hydraulic roof cutting device, including a slotting and fracturing integrated device, a high-pressure double-layer drill rod, a high-pressure mortar water jet device and the like, adopts a directional hydraulic roof cutting method, and makes high-pressure water split and diffuse rock strata along two slot directions by prefabricating slot on the inner wall of a roof cutting drill hole, thereby effectively solving the problem of uncertain hydraulic roof cutting diffusion range, achieving the purpose of directional hydraulic roof cutting, and having great significance for controlling the mining pressure influence of a working face.
Drawings
FIG. 1 is a schematic diagram of a structure of the invention when high-pressure mortar water jet is adopted for slotting;
FIG. 2 is a schematic view of the structure of the invention in the process of directional hydraulic roof cutting construction;
FIG. 3 is a schematic diagram of a fracturing and jetting integrated device of the present invention;
FIG. 4 is a schematic view of a cutting device according to the present invention;
FIG. 5 is a schematic view of a drill pipe of the present invention connected to an outer cone power sub of a drilling rig.
In the figure: 1. a slotting and fracturing integrated device; 11. expanding the capsule; 111. a metal housing; 112. a rubber expansion body; 12. a cutting device; 121. a high pressure mortar water jet nozzle; 122. fracturing a high-pressure water outlet channel; 13. an expansion capsule injected with high-pressure water;
2. Double-layer drill rod; 21. the drill rod is connected with the outer cone power joint of the drilling machine; 211. a high pressure mortar water jet connector; 212. a wind-water joint;
3. A high-pressure mortar water jet device; 31. a high pressure water pump; 32. a high-pressure mortar mixing device; 33. a high pressure water pipe;
4. an inner layer high-pressure mortar water jet pipeline; 5. an outer layer pipeline; 51. an outer layer compressed air pipeline; 52. an outer high pressure water line; 6. cutting a slit groove; 7. and (5) an air pipe.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 5, the invention provides a method for directional hydraulic topping, which comprises the following specific operation steps:
S1, detecting production geological conditions of a working face, and analyzing and judging positions of key rock layers of a top plate;
S2, designing parameters such as a topping direction, a range and the like according to the result of geological condition detection of the working face production;
s3, roof cutting and drilling are constructed according to roof cutting parameters;
S4, feeding the slotting and fracturing integrated device into a first slotting point in the designed drilling hole, and slotting the inner wall of the drilling hole at the slotting point by using high-pressure mortar water jet;
s5, carrying out fracturing construction on the slit point where the slit is completed, and completing directional hydraulic roof cutting operation of the first slit point;
S6, moving the slotting and fracturing integrated device to a second slotting point of the drilling hole, and performing directional hydraulic topping operation;
s7, repeating the steps of S4-S5, and performing directional hydraulic roof cutting construction of the third slotting point and the nth slotting point of the fourth slotting point … until the directional hydraulic roof cutting construction of the drilling hole is completed;
S8, checking a directional hydraulic roof cutting effect by adopting a drilling peeping method, and if the designed roof cutting effect is achieved, continuing to perform directional hydraulic roof cutting by adopting the parameter until all the construction is completed; if the designed topping effect is not achieved, re-analyzing and selecting topping parameters and the like until the designed topping effect is achieved.
The geological conditions of the roof cutting area are determined in advance, the basic conditions of the roof cutting area are determined, the safety and feasibility of subsequent work are guaranteed, and the directional hydraulic roof cutting parameters including the roof cutting direction, the range and the drilling parameters are analyzed and designed through combination of the determined parameters and the actual conditions, so that the subsequent fracturing parameters are determined; then, roof cutting and drilling are constructed according to the pre-designed parameters, a slot is formed in the inner wall of the drill hole at the slot point, high-pressure water is used for fracturing at the slot point, the continuously injected high-pressure water acts on the inner wall of the drill hole, stress concentration is formed near the slot because the inner wall of the drill hole at the slot point is damaged, and when the pressure of the high-pressure water is larger than the sum of the tensile strength of the rock stratum, the maximum principal stress and the minimum principal stress difference value, the rock stratum is split and diffused along the directions of the two slots, so that the aim of directional roof cutting by hydraulic fracturing is achieved.
Wherein, in the step S1, the geological conditions of the production of the working surface are detected, including but not limited to: testing physical and mechanical properties of the roof strata, analyzing the structure of the roof strata, testing ground stress and the like;
The physical and mechanical property test of the roof strata adopts roof drilling coring, and tests a coring sample to analyze the strength of the roof strata and the position of the hard strata; the roof stratum structure is mainly obtained by peeping a roof drilling hole, and the state of the roof stratum and the crack development condition are analyzed; comprehensively obtaining the positions of the top plate key layers with high strength and large layering thickness; the ground stress test can obtain the direction and the magnitude of the maximum main stress and the minimum main stress.
The invention also provides a directional hydraulic roof cutting device, which comprises a slotting and fracturing integrated device 1, wherein the slotting and fracturing integrated device 1 comprises two expansion capsules 11 and a cutting device 12, the outer ends of the cutting device 12 are respectively provided with the expansion capsules 11, one ends are in threaded connection, and the other ends are in sealing ring connection; the cutting device 12 is an inner-outer double-layer pipeline, the metal shells 111 are fixedly arranged at the head end and the tail end of the two expansion capsules 11, the inner side of the two expansion capsules 11 is provided with an inner-layer high-pressure mortar water jet pipeline 4, the outer side of the two expansion capsules 11 is provided with a rubber expansion body 112, the middle of the cutting device 12 is provided with a high-pressure mortar water jet nozzle 121 connected with the high-pressure mortar water jet pipeline 4, and the outer edge of the nozzle 121 is provided with a fracturing high-pressure water outlet channel 122; the bottom of the metal shell 111 at the tail end of the expansion capsule 11 is connected with a double-layer drill rod 2 in a threaded manner, the double-layer drill rod 2 is divided into an inner layer and an outer layer, the inner layer and the outer layer respectively correspond to the inner layer high-pressure mortar water jet pipeline 4 and the outer layer pipeline 5, and an inner pipe high-pressure mortar water jet connector 211 and an outer pipe wind-water connector 212 are arranged at the tail part of the double-layer drill rod 21 connected with the outer cone power connector of the drilling machine.
Wherein, the inside of the expansion capsule 11 is formed into an expansion capsule 13 after injecting high-pressure water by injecting high-pressure water; the structure of the fracturing and jetting integrated device 1 is completely consistent along the longitudinal middle axial surface of the cutting device 12, namely the two ends of the longitudinal middle axial surface of the high-pressure mortar water jet nozzle 121 area.
Aiming at the step S4, the slotting and fracturing integrated device is sent into a first slotting point in a drill hole, and the high-pressure mortar water jet is used for slotting the inner wall of the drill hole at the slotting point: the process flow comprises the following steps: the tail of the slotting and fracturing integrated device 1 is connected with a double-layer drill rod 2, the integrated devices are fed into slotting points inside drilling holes one by a drilling machine, and the drill rod 21 connected with an outer cone power joint of the drilling machine is arranged at the bottommost part; connecting a high-pressure water pump 31 with a water inlet of a high-pressure mortar mixing device 32, connecting a water outlet with a high-pressure mortar water jet connector 211 at the tail part of a drill rod 21 connected with an outer cone power connector by adopting a through connection, opening the high-pressure mortar mixing device 32, jetting high-pressure mortar water jet through a bidirectional high-pressure mortar water jet nozzle 121 arranged on a cutting device 12, acting on the inner wall of a drill hole, cutting the inner wall of the drill hole, and controlling the up-and-down movement of an integrated device by using a drilling machine to form a slit groove 6; at the moment, the air-water joint 212 is connected with the air pressing pipe 7 through a straight way, so that the slotting efficiency can be improved when the high-pressure mortar water jet slots the inner wall of the drill hole; the length of the slit 6 is smaller than the length of the cutting device 12.
The inner layer of the double-layer drill rod is an inner layer high-pressure mortar water jet pipeline 4, the outer layer pipeline 5 is an outer layer compressed air pipeline 51 during slotting, the outer layer high-pressure water pipeline 52 during fracturing, the bottom-most one of the double-layer drill rod 2 is a drill rod 21 connected with a power joint of a drilling machine, the tail part of the drill rod 21 is provided with a high-pressure mortar water jet joint 211 and an air-water joint 212, the air-water joint 212 of the double-layer drill rod is an air pipe joint 213 during slotting, and the air-water joint 214 during fracturing.
The high-pressure mortar water jet is formed after being mixed by the high-pressure mortar water jet device 3, the high-pressure mortar water jet device 3 comprises a high-pressure water pump 31, a high-pressure mortar mixing device 32 and a high-pressure water pipe 33, the high-pressure water enters the high-pressure mortar mixing device 32 to form a high-pressure mortar water jet, and the high-pressure mortar water jet is ejected from the high-pressure mortar water jet nozzle 121 through the inner pipe 4 of the double-layer drill pipe 2 to slit the inner wall of the drill hole to form a slit groove 6.
Aiming at the hydraulic fracturing construction of the fracturing point with the cut in the step S5, the directional hydraulic fracturing of the first fracturing point is completed, and the process flow is as follows: after the slotting is completed, the high-pressure mortar mixing device 32 and the air pipe 7 are closed, the integrated device 1 is moved to enable the slotting groove 6 to be located at the middle position of the integrated device 1, then a double-layer drill pipe in a roadway is fixed, the high-pressure water pipe 32 at the moment is connected with the air-water joint 212, the high-pressure water pump 31 is opened, high-pressure water enters the integrated device 1 through the outer layer pipeline 5 of the double-layer drill pipe 2, the expansion capsule 11 is expanded to become an expansion capsule 13 after high-pressure water injection, the integrated device 1 is fixed in a drilling hole at the moment, a temporary closed space is formed between the two expansion capsules 13 after high-pressure water injection, high-pressure water continues to be injected, the high-pressure water continuously acts on the inner wall of the drilling hole through the high-pressure water outlet channel 122 of the outer edge of the cutting device nozzle 121, stress concentration is formed near the slotting groove 6, and when the high-pressure water pressure is larger than the sum of the tensile strength and the maximum main stress and the minimum main stress difference value of the rock stratum, the high-pressure water is split along the directions of the two slotting grooves 6, and the purpose of directional hydraulic fracturing is achieved.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A method for directional hydraulic topping, which is characterized in that: adopt directional water conservancy to cut device on top, including slotting fracturing integrator (1) and high-pressure mortar water jet device (3), slotting fracturing integrator (1) is including two inflation capsules (11), cutting device (12), its characterized in that: the cutting device is characterized in that the outer ends of the cutting device (12) are provided with expansion capsules (11), the upper end and the lower end of the cutting device (12) are respectively in sealing ring connection and threaded connection, the cutting device (12) is an inner layer pipeline and an outer layer pipeline, two metal shells (111) are fixedly arranged at the front end and the rear end of the expansion capsules (11), an inner layer high-pressure mortar water jet pipeline (4) and an outer rubber expansion body (112) are arranged on the inner side of the expansion capsules (11), a high-pressure mortar water jet nozzle (121) connected with the high-pressure mortar water jet pipeline (4) is arranged in the middle of the cutting device (12), the outer edge of the nozzle (121) is a fracturing high-pressure water outlet channel (122), the bottom threaded connection of the metal shells (111) is provided with a double-layer drill rod (2), the double-layer drill rod (2) is divided into an inner layer high-pressure mortar water jet pipeline (4) and an outer layer pipeline (5), one of the bottommost part of the double-layer drill rod (2) is a double-layer conical power joint (21) connected with a drilling machine, and the outer layer high-pressure mortar water jet pipeline (212) is connected with the outer layer pipeline (212), and the outer layer pipeline (212) is provided with an outer layer water jet pipeline (212), and the outer layer water jet pipeline (212) is connected with the outer pipe (212) in a water joint (212) The fracturing is performed by a high-pressure water joint (214) and an outer high-pressure water pipeline (52);
The specific operation steps are as follows:
S1, detecting production geological conditions of a working face, and analyzing and judging positions of key rock layers of a top plate;
s2, designing a topping direction and a range parameter according to the result of geological condition detection of the working face;
s3, roof cutting and drilling are constructed according to roof cutting parameters;
S4, feeding the slotting and fracturing integrated device into a first slotting point in the designed drilling hole, and slotting the inner wall of the drilling hole at the slotting point by using high-pressure mortar water jet;
s5, carrying out fracturing construction on the slit point where the slit is completed, and completing directional hydraulic roof cutting operation of the first slit point;
S6, moving the slotting and fracturing integrated device to a second slotting point of the drilling hole, and performing directional hydraulic topping operation;
s7, repeating the steps of S4-S5, and performing directional hydraulic roof cutting construction of the third slotting point and the nth slotting point of the fourth slotting point … until the directional hydraulic roof cutting construction of the drilling hole is completed;
s8, checking a directional hydraulic roof cutting effect by adopting a drilling peeping method, and if the designed roof cutting effect is achieved, continuing to perform directional hydraulic roof cutting by adopting the parameter until all the construction is completed; if the designed topping effect is not achieved, re-analyzing and selecting topping parameters until the designed topping effect is achieved.
2. A method of directional hydraulic topping according to claim 1, wherein: the detection of the production geological conditions of the working surface in step S1 includes, but is not limited to: testing physical and mechanical properties of the roof strata, analyzing the structure of the roof strata and testing the ground stress.
3. A method of directional hydraulic topping according to claim 1, wherein: the two ends of the longitudinal middle axial surface of the cutting device (12), namely the longitudinal middle axial surface of the high-pressure mortar water jet nozzle (121) area, are completely consistent in structure.
4. A method of directional hydraulic topping according to claim 1, wherein: the high-pressure mortar water jet device (3) comprises a high-pressure water pump (31), a high-pressure mortar mixing device (32) and a high-pressure water pipe (33), high-pressure mortar water jet is formed by entering high-pressure water in the high-pressure mortar mixing device (32), and is ejected from a high-pressure mortar water jet nozzle (121) through an inner pipe of the double-layer drill pipe (2) to slit the inner wall of a drill hole to form a slit groove (6).
Priority Applications (1)
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