Separate layer fracturing grouting water control device and method for extremely thick aquifer of coal mine

Abstract

The invention belongs to the technical field of reinforcement of soft strata under extremely thick aquifers, and particularly relates to a separate layer fracturing grouting water control device and method for an extremely thick aquifer of a coal mine, the device is formed by combining a plurality of adjustable nozzle hole packers, and each adjustable nozzle hole packer comprises a shell; a main water injection pipe; the auxiliary water injection pipes are circumferentially arranged on the outer side of the main water injection pipe; the auxiliary water injection pipe is communicated with the main water injection pipe; the fracturing assemblies are arranged around the shell, one ends of the fracturing assemblies communicate with the main water injection pipe, and the other ends of the fracturing assemblies face the rock stratum; the crack induction parts are arranged around the shell, and the angles of the crack induction parts are adjustable; the clamping and fixing part is fixed to the outer side of the shell and used for being fixed to the inner wall of the drill hole; the upper splicing part is fixed to the top of the shell and communicates with the main water injection pipe; and the lower splicing part is fixed to the bottom of the shell and communicates with the main water injection pipe, and the upper splicing part is matched with the lower splicing part. The invention further discloses a separate layer fracturing grouting water control implementation method.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of soft rock layer reinforcement under thick aquifer, and particularly relates to a coal mine thick aquifer layered fracturing grouting water control device and method. BACKGROUND

[0002] The reinforcement engineering of soft rock layer under thick aquifer in coal mine underground has long faced technical difficulties. In the implementation process of the traditional hydraulic fracturing process, due to the lack of effective crack guiding mechanism, the cracks formed by high-pressure water flow expand in a disorderly radial manner, which easily penetrates the adjacent aquifer to cause water inrush accidents. When the distance between the soft rock layer and the aquifer is small, random cracks can cause water inrush danger. At the same time, the conventional grouting process and the fracturing link are mutually cut off, that is, the fracturing is first implemented through an independent borehole, and then a separate grouting hole is drilled for reinforcement, which causes the crack network formed by fracturing not to be effectively utilized, the diffusion range of the slurry in the rock mass without flow guide channel is small, a large number of unreinforced blind areas are formed, and the engineering is forced to repeat drilling and grouting.

[0003] The existing improved layered fracturing device attempts to perform segmented operations, but the fixed-angle nozzle can only generate one-way cracks, and cannot build a three-dimensional interwoven crack network, which is low in construction efficiency. Therefore, a coal mine thick aquifer layered fracturing grouting water control device and method are urgently needed to solve the problem. SUMMARY

[0004] The purpose of the present application is to provide a coal mine thick aquifer layered fracturing grouting water control device and method to solve the above problems.

[0005] To achieve the above purpose, the present application provides the following scheme:

[0006] A coal mine thick aquifer layered fracturing grouting water control device is composed of a plurality of adjustable nozzle sealers, the adjustable nozzle sealer comprises:

[0007] a shell;

[0008] a main water injection pipe fixedly arranged in the shell;

[0009] a plurality of auxiliary water injection pipes arranged circumferentially outside the main water injection pipe, the auxiliary water injection pipes being fixed with the shell; the auxiliary water injection pipes being in communication with the main water injection pipe;

[0010] a plurality of fracturing assemblies arranged around the shell, one end of the fracturing assembly being in communication with the main water injection pipe, and the other end of the fracturing assembly being arranged towards the rock layer;

[0011] a plurality of crack inducing parts arranged around the shell, the crack inducing part being adjustable in angle, one end of the crack inducing part being in communication with the corresponding auxiliary water injection pipe, and the other end of the crack inducing part being arranged towards the rock layer;

[0012] A clamping portion is fixed outside the shell and used for fixing with the inner wall of the borehole;

[0013] An upper splicing portion is fixed at the top of the shell and communicates with the main water injection pipe;

[0014] A lower splicing portion is fixed at the bottom of the shell and communicates with the main water injection pipe, and the upper splicing portion matches with the lower splicing portion.

[0015] Optionally, the main water injection pipe and the auxiliary water injection pipe communicate through a shunt pipe, and an auxiliary water injection pipe valve is arranged in the middle of the shunt pipe and used for controlling the water flow from the main water injection pipe to the auxiliary water injection pipe.

[0016] The main water injection pipe and the auxiliary water injection pipe are fixed in the shell through a main / auxiliary water pipe fixing device.

[0017] Optionally, the fracturing assembly comprises:

[0018] A fracturing water outlet is arranged in the middle of the shell and communicates with the main water injection pipe through a fracturing communication pipe.

[0019] Optionally, the fracture induction portion comprises:

[0020] An adjustable nozzle is fixed in the middle of the shell, one end of the adjustable nozzle communicates with the auxiliary water injection pipe through a communication pipe, and the other end of the adjustable nozzle is arranged towards the rock stratum.

[0021] Optionally, the clamping portion comprises:

[0022] An expansion capsule is coaxially fixed outside the shell;

[0023] A hole sealing iron sheet is coaxially fixed outside the expansion capsule;

[0024] The expansion capsules are arranged in pairs and symmetrically distributed on both sides of the adjustable nozzle.

[0025] Optionally, the upper splicing portion comprises:

[0026] An external thread screw joint is fixed at the center of the top of the shell, the external thread screw joint is hollow, and the bottom end of the external thread screw joint communicates with the top of the main water injection pipe through a main water injection pipe valve.

[0027] Optionally, the lower splicing portion comprises:

[0028] An inner thread screw groove is arranged at the bottom of the shell, the inner thread screw groove is matched with the outer thread screw joint, the inner thread screw groove is hollow, and the inner thread screw groove is communicated with the bottom of the main water injection pipe.

[0029] Optionally, when the inner thread screw groove needs to be blocked, a blocking steel plug is matched with the inner thread screw groove in a threaded manner.

[0030] Optionally, the lower splicing part of the front adjustable nozzle packer is detachably connected with the upper splicing part of the rear adjustable nozzle packer, the shells of the adjacent two adjustable nozzle packers are fixed through a plurality of connection fixing devices, and the upper splicing part of the front adjustable nozzle packer is communicated with the liquid outlet end of the fracturing high-pressure pump station.

[0031] The implementation method of the layered fracturing grouting water control device comprises the following steps:

[0032] Determining the position of the soft rock layer;

[0033] Drilling a hole;

[0034] Adjusting the angle of the crack induction part of each layered fracturing grouting water control device as needed;

[0035] Pushing the layered fracturing grouting water control device to the soft rock layer;

[0036] Injecting high-pressure water into the soft rock layer through the layered fracturing grouting water control device, forming an induced crack in the soft rock layer through the crack induction part, and forming a crack network along the induced crack;

[0037] Grouting into the crack network to form a grouting area.

[0038] Compared with the prior art, the layered fracturing grouting water control device has the following advantages and technical effects:

[0039] The layered fracturing grouting water control device can precisely control the crack expansion direction of the soft rock layer through the multi-angle adjustable crack induction part, significantly reduces the risk of misentry of the crack into the aquifer, adopts a double-water-pipe staged operation mode of a main water injection pipe and an auxiliary water injection pipe, first induces a crack through the auxiliary water injection pipe, and then forms a three-dimensional interwoven crack network through high-pressure fracturing of the main water injection pipe, thereby improving the crack forming efficiency; and relies on the directional crack formed by fracturing as a natural grouting channel, so that the grout diffusion radius is expanded, the drilling amount is reduced, and the construction efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed in the embodiments will be briefly introduced as follows. Obviously, the accompanying drawings in the following description only represent some embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative effort based on these drawings belong to the protection scope of the present application.

[0041] Figure 1 The figure is a schematic diagram of the layered fracturing hole sealing device of the present application.

[0042] Figure 2 The figure is a schematic diagram of the multi-section hole sealing device installation of the present application.

[0043] Figure 3 The figure is a schematic diagram of the layered fracturing of soft rock stratum of the present application.

[0044] Figure 4 The figure is a schematic diagram of the grouting process of soft rock stratum of the present application.

[0045] Figure 5 The figure is a schematic diagram of the structure of the multi-section connection fixing device of the present application.

[0046] Among them, 1, main water injection pipe; 2, auxiliary water injection pipe; 3, fracturing water outlet; 4, fracturing communication pipe; 5, adjustable nozzle; 6, communication pipe; 7, expansion capsule; 8, hole sealing iron sheet; 9, main and auxiliary water pipe fixing device; 10, auxiliary water injection pipe valve; 11, main water injection pipe valve; 12, plugging steel plug; 13, internal thread screw groove; 14, external thread screw joint; 15, shell; 16, shunt pipeline; 17, upper nozzle; 18, middle nozzle; 19, lower nozzle; 20, multi-section connection fixing device; 21, induced fracture; 22, fracture network; 23, fracturing high-pressure pump station; 24, thick aquifer; 25, soft rock stratum; 26, grouting area; 27, grouting station. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0048] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] Reference Figures 1 to 5 The present application discloses a coal mine thick aquifer layered fracturing grouting water control device, which is composed of a plurality of adjustable nozzle hole sealing devices. The adjustable nozzle hole sealing device comprises:

[0050] The shell 15;

[0051] The main water injection pipe 1 is fixedly arranged in the shell 15;

[0052] The plurality of auxiliary water injection pipes 2 are arranged outside the main water injection pipe 1 in a circumferential direction, and the auxiliary water injection pipes 2 are fixed to the shell 15; the auxiliary water injection pipes 2 are in communication with the main water injection pipe 1;

[0053] The plurality of fracturing assemblies are arranged around the shell 15, one end of each fracturing assembly is in communication with the main water injection pipe 1, and the other end of each fracturing assembly is arranged towards the rock stratum;

[0054] The plurality of crack inducing portions are arranged around the shell 15, the crack inducing portions are adjustable in angle, one end of each crack inducing portion is in communication with a corresponding auxiliary water injection pipe 2, and the other end of each crack inducing portion is arranged towards the rock stratum;

[0055] The clamping portion is fixed to the outside of the shell 15 and is used for being fixed to the inner wall of the borehole;

[0056] The upper splicing portion is fixed to the top of the shell 15, and the upper splicing portion is in communication with the main water injection pipe 1;

[0057] The lower splicing portion is fixed to the bottom of the shell 15, and the lower splicing portion is in communication with the main water injection pipe 1; the upper splicing portion is matched with the lower splicing portion.

[0058] In use, high-pressure water is injected into the main water injection pipe 1, the high-pressure water is divided into the plurality of auxiliary water injection pipes 2 from the main water injection pipe 1, the direction of the crack inducing portion is adjusted, the water in the auxiliary water injection pipe 2 is caused to flow out of the crack inducing portion to form a guide crack in the rock stratum, the high-pressure water in the main water injection pipe 1 is caused to spray into the rock stratum through the fracturing assembly, a crack region is formed around the guide crack, compared with a conventional fixed-angle nozzle which can only generate a unidirectional crack, the crack inducing portion of the present application is adjustable in angle, so that the guide crack in different directions is conveniently formed, and a three-dimensional interwoven crack network is formed through the guide crack.

[0059] The present application precisely controls the crack expansion direction of the soft rock stratum 25 through the multi-angle adjustable crack inducing portion, significantly reduces the risk of misentry of the crack into the aquifer, adopts a two-stage operation mode of the main water injection pipe 1 and the auxiliary water injection pipe 2, first induces the crack in a direction through the auxiliary water injection pipe 2, and then forms a three-dimensional interwoven crack network through high-pressure fracturing of the main water injection pipe 1, thereby improving the crack forming efficiency; the directional crack formed through fracturing is used as a natural slurry channel, so that the slurry diffusion radius is expanded, the amount of drilling is reduced, and the construction efficiency is improved.

[0060] As an optional implementation, the main water injection pipe 1 and the auxiliary water injection pipe 2 are in communication through a shunt pipeline 16, the auxiliary water injection pipe valve 10 is arranged in the middle of the shunt pipeline 16 in a communication mode, and the auxiliary water injection pipe valve 10 is used for controlling the water amount flowing from the main water injection pipe 1 to the auxiliary water injection pipe 2;

[0061] The main water injection pipe 1 and the auxiliary water injection pipe 2 are fixed in the casing 15 by the main and auxiliary water pipe fixing device 9.

[0062] The main and auxiliary water pipe fixing device 9 is a fixed plate, which is fixed to the outer wall of the main water injection pipe 1 and the auxiliary water injection pipe 2, and is fixed to the inner wall of the casing 15.

[0063] As an optional embodiment, the fracturing assembly comprises:

[0064] The fracturing outlet 3 is arranged in the middle of the casing 15, and the fracturing outlet 3 is communicated with the main water injection pipe 1 through the fracturing communication pipe 4.

[0065] As an optional embodiment, the fracture inducing part comprises:

[0066] The adjustable nozzle 5 is fixed in the middle of the casing 15, one end of the adjustable nozzle 5 is communicated with the auxiliary water injection pipe 2 through the communication pipe 6, and the other end of the adjustable nozzle 5 is arranged towards the rock stratum.

[0067] As an optional embodiment, the clamping part comprises:

[0068] The expansion capsule 7 is coaxially fixed outside the casing 15;

[0069] The sealing iron sheet 8 is coaxially fixed outside the expansion capsule 7;

[0070] The expansion capsules 7 are arranged in pairs and symmetrically distributed on both sides of the adjustable nozzle 5.

[0071] As an optional embodiment, the upper splicing part comprises:

[0072] The external thread screw joint 14 is fixed at the top center of the casing 15, the external thread screw joint 14 is hollow, and the bottom end of the external thread screw joint 14 is communicated with the top of the main water injection pipe 1 through the main water injection pipe valve 11.

[0073] As an optional embodiment, the lower splicing part comprises:

[0074] The internal thread screw groove 13 is arranged in the bottom of the casing 15, the internal thread screw groove 13 is matched with the external thread screw joint 14, the internal thread screw groove 13 is hollow, and the internal thread screw groove 13 is communicated with the bottom of the main water injection pipe 1.

[0075] As an optional embodiment, when the internal thread screw groove 13 needs to be sealed, the internal thread screw groove 13 is matched with the sealing steel plug 12 in the internal thread screw groove 13.

[0076] The adjustable nozzle sealing device comprises the main water injection pipe 1, the upper end of the main water injection pipe 1 is communicated with the external thread screw joint 14, the lower end of the main water injection pipe 1 is communicated with the internal thread screw groove 13, and the main water injection pipe 1 is an integral structure with the external thread screw joint 14 and the internal thread screw groove 13.

[0077] The external thread screw joint 14 is used to connect with the water injection pipe of the fracturing high-pressure pump station 23, and the external thread screw joint 14 can be connected with the internal thread screw groove 13, and the internal thread screw groove 13 can be connected with the blocking steel plug 12 to achieve the effect of blocking the high-pressure water flow. The external thread screw joint 14 and the middle end of the main water injection pipe 1 are provided with the main water injection pipe valve 11 and the shunt pipe 16. The main water injection pipe valve 11 controls whether the high-pressure water flow can flow into the main water injection pipe 1. The shunt pipe 16 connects the auxiliary water injection pipe 2 with the main water injection pipe 1, and can guide the high-pressure water flow into the auxiliary water injection pipe 2. The shunt pipe 16 is provided with the auxiliary water injection pipe valve 10 to control whether the high-pressure water flow can flow into the auxiliary water injection pipe 2. The main water injection pipe 1 and the auxiliary water injection pipe 2 are connected and fixed with the shell 15 through the main and auxiliary water pipe fixing device 9. Four to six auxiliary water injection pipes 2 can be fixed and installed around the outside of the main water injection pipe 1.

[0078] The shell 15 is provided with the expansion capsule 7 on the outside, and the expansion capsule 7 is provided with the hole sealing iron sheet 8 on the outside. The expansion capsule 7 and the hole sealing iron sheet 8 realize the hole sealing function.

[0079] The shell 15 is also provided with the adjustable nozzle 5 and the fracturing water outlet 3. The adjustable nozzle 5 is used for crack induction, and the fracturing water outlet 3 is used for hydraulic fracturing. The adjustable nozzle 5 is provided with the communication pipe 6 inside. The communication pipe 6 is communicated with the auxiliary water injection pipe 2, guides the high-pressure water flow into the adjustable nozzle 5, and realizes directional crack induction by shooting out through the nozzle with the adjusted direction. The fracturing communication pipe 4 is also provided inside the fracturing water outlet 3 and communicated with the main water injection pipe 1, to guide the high-pressure water flow to realize the hydraulic fracturing process.

[0080] As an optional embodiment, the lower splicing part of the front adjustable nozzle hole sealer is detachably connected with the upper splicing part of the rear adjustable nozzle hole sealer. The shells 15 of the adjacent two adjustable nozzle hole sealers are fixed through the multi-section connection fixing device 20. The upper splicing part of the adjustable nozzle hole sealer at the front end is communicated with the liquid outlet end of the fracturing high-pressure pump station 23.

[0081] Further, the multi-section connection fixing device 20 is composed of two semicircular iron rings with the same size. The two semicircular iron rings are clamped on the two sides of the splicing joint of the hole sealers, and the two semicircular iron rings are fixed by bolts, so that the two semicircular iron rings clamp and fix the two hole sealers.

[0082] The single hole sealer can be combined to form a layered fracturing grouting water control device through the external thread joint 14, the threaded connection of the external thread joint 14, and the multi-section connection fixing device 20. The first section of the sealing steel plug 12 is removed, the external thread joint 14 of the second section is connected into the internal thread screw groove 13 of the first section of the hole sealer, and the multi-section connection fixing device 20 is arranged outside this section to further ensure the stability of the connection. The subsequent hole sealers are connected in sequence according to the above steps, and the sealing steel plug 12 is arranged at the bottom end of the last section of the hole sealer to prevent high-pressure water jet from leaking out.

[0083] The implementation method of layered fracturing grouting water control uses the layered fracturing grouting water control device described above, which includes:

[0084] Determine the position of the soft rock layer 25;

[0085] Drilling;

[0086] Adjust the angle of the crack induction part of each layered fracturing grouting water control device as needed;

[0087] Push the layered fracturing grouting water control device to the soft rock layer 25;

[0088] Inject high-pressure water into the soft rock layer 25 through the layered fracturing grouting water control device, form induced cracks 21 in the soft rock layer 25 through the crack induction part, and form a crack network 22 along the induced cracks 21;

[0089] Grouting and reinforcement in the crack network 22 to form a grouting area 26.

[0090] Specifically includes the following steps:

[0091] Drill a hole to the soft rock layer 25 under the thick aquifer 24: collect geological data parameters of the mining area, obtain the columnar graph of the mine drilling, determine the relative position of the thick aquifer 24 and the soft rock layer 25, reasonably arrange the fracturing drilling position according to the geological data, and drill a hole from the ground to the soft rock layer 25 under the thick aquifer 24 according to the arrangement method, and arrange the hydraulic fracturing device in the drilling.

[0092] Hole sealer device assembly and nozzle adjustment: according to the obtained geological data of the soft rock layer 25, the hole sealer is assembled in multiple sections to ensure reasonable installation of the hole sealer, and the nozzle direction is set according to the data parameters of the thick aquifer 24 and the soft rock to reasonably induce the crack generation direction.

[0093] Induced cracks and hydraulic fracturing: the assembled and set hole sealer is pushed into the equipment through the hydraulic fracturing hole sealer, reaches the soft rock layer 25 through the drilling, first induces cracks in the soft rock layer 25 using the auxiliary water injection pipe and the nozzle with the adjusted direction, and then performs hydraulic fracturing on the soft rock layer 25 using the main water injection pipe and the fracturing outlet to form a crack network.

[0094] Crack network monitoring and drilling grouting borehole: after hydraulic fracturing is completed, the position and distribution of the crack network are monitored, and a grouting borehole is drilled to the position where the crack network is distributed.

[0095] Grouting reinforcement: a grouting pipeline is arranged in the grouting borehole, a grouting pump station on the ground is used to carry out grouting reinforcement and anti-seepage process in the specified area, and the slurry will diffuse along the crack network to achieve the expected grouting effect.

[0096] As one of the application examples, the application example obtains geological data parameters and mine drilling columnar chart of the mining area through geological exploration means, determines the specific positions of the thick aquifer 24 and the soft rock layer 25 according to the obtained data, and clearly defines the relative positions of the thick aquifer 24 and the soft rock layer 25, and positions the soft rock layer 25 under the thick aquifer 24.

[0097] According to the geological data, the hydraulic fracturing borehole arrangement scheme is determined on the ground to ensure that the arrangement scheme can meet the fracturing requirements, and the hydraulic fracturing borehole is drilled from the ground to the soft rock layer 25 under the thick aquifer 24, and the borehole is used to arrange a high-pressure water injection pipe and a packer. The packer described in the foregoing invention example is assembled according to the above requirements, the number of segments of the packer is clearly defined according to the geological parameters of the soft rock layer 25, the length of the assembled multi-segment packer meets the prepared fracturing scheme, and the direction of the nozzle is adjusted according to the fracturing scheme to ensure that the induced cracks develop according to the expected scheme.

[0098] In the implementation method of the application example, three packers are assembled, the direction of the nozzle 17 at the uppermost end of the packer is 30° downward, the direction of the nozzle 18 in the middle segment of the packer is 0° horizontal, and the direction of the nozzle 19 at the lowermost end of the packer is 30° upward, so as to meet the requirements of the fracturing scheme.

[0099] The assembled packer is pushed into the soft rock layer 25 where hydraulic fracturing is required by using the hydraulic fracturing packer pushing device through the borehole, after being pushed to the specified position, the auxiliary water injection pipe valve 10 is opened, the main water injection pipe valve 11 is opened, and the fracturing water outlet 3 is closed, so that the high-pressure water flow flows into the auxiliary water injection pipe 2 through the shunt pipe 16, and the soft rock layer 25 is subjected to crack induction through the adjustable nozzle 5 with the adjusted direction. The fracturing high-pressure pump station 23 is opened, the high-pressure water flow is pushed in, the desired cracks are subjected to fracturing through the nozzle, the induced cracks 21 in the specified direction are formed, after the induced crack process is completed, the auxiliary water injection pipe valve 10 is closed, the main water injection pipe valve 11 is opened, and the fracturing water outlet 3 is opened, the high-pressure water flow is introduced into the main water injection pipe 1, and the hydraulic fracturing process is completed through the fracturing water outlet 3, and the crack network 22 formed in the soft rock layer 25 by the hydraulic fracturing process will develop according to the induced cracks 21.

[0100] After the hydraulic fracturing process is completed, the position and distribution of the fracture network 22 are determined by geological exploration means, a grouting borehole layout scheme is designed according to the distribution position of the detected fracture network 22, the scheme requires that the grouting borehole can be drilled to the distribution area of the fracture network 22, and the drilling scheme is constructed on the ground according to the design. After the drilling layout is completed, the grouting pipeline is arranged in the grouting borehole, after the pipeline layout is completed, the ground grouting station 27 is used to carry out grouting reinforcement and anti-seepage process in the designated area, the diffusion direction of the slurry will follow the directional fracture network 22 fractured by hydraulic fracturing to diffuse, forming a grouting area 26, so as to achieve the expected grouting effect.

[0101] The present application precisely controls the crack propagation direction of the soft rock layer 25 through the multi-angle adjustable nozzle, significantly reduces the risk of misentry of the crack into the aquifer, adopts a main and auxiliary double grouting pipe staged operation mode, first induces the crack by the auxiliary pipe, and then forms a three-dimensional interwoven fracture network through the main pipe high pressure fracturing, improves the crack efficiency, relies on the directional fracture formed by fracturing as a natural grouting channel, expands the slurry diffusion radius, and reduces the drilling amount; the modularized hole sealing device design cooperates with the double-stage sealing structure, realizes full coverage and high-pressure working condition zero leakage of the soft rock layer 25 of different thicknesses, and solves the problems of aquifer leakage and insufficient reinforcement of the soft rock layer 25.

[0102] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.

[0103] The above-described embodiments are only preferred modes of the present application, and do not limit the scope of the present application, and various modifications and improvements to the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A water control device for layered fracturing and grouting in thick aquifers in coal mines, characterized in that: It is composed of several adjustable nozzle sealers, which include: Housing (15); A main water injection pipe (1) is fixedly arranged in the housing (15); A plurality of auxiliary water injection pipes (2) are circumferentially arranged outside the main water injection pipe (1), the auxiliary water injection pipes (2) being fixed to the shell (15); the auxiliary water injection pipes (2) are in communication with the main water injection pipe (1); A plurality of fracturing components are arranged around the shell (15), one end of each fracturing component is connected to the main water injection pipe (1), and the other end of each fracturing component is arranged toward the rock formation; A plurality of fracture inducing parts are arranged around the shell (15), the angle of the fracture inducing parts is adjustable, one end of the fracture inducing part is connected to the corresponding auxiliary water injection pipe (2), and the other end of the fracture inducing part is arranged toward the rock formation; A fixing portion, fixed on the outside of the housing (15) and used to be fixed to the inner wall of the drill hole; An upper splicing portion, fixed to the top of the shell (15) and connected to the main water injection pipe (1); The lower splicing part is fixed to the bottom of the shell (15) and is in communication with the main water injection pipe (1), and the upper splicing part matches the lower splicing part.

2. The device for grouting and controlling water in thick coal mine aquifers according to claim 1, characterized in that: The main water injection pipe (1) and the auxiliary water injection pipe (2) are connected via a shunt pipe (16); a shunt pipe valve (10) is provided in the middle of the shunt pipe (16); the shunt pipe valve (10) is used to control the amount of water flowing from the main water injection pipe (1) to the auxiliary water injection pipe (2); The main water injection pipe (1) and the auxiliary water injection pipe (2) are both fixed in the housing (15) via a main and auxiliary water pipe fixing device (9).

3. The device for grouting and controlling water in thick coal mine aquifers according to claim 1, characterized in that: The fracturing assembly comprises: A fracturing water outlet (3) is provided in the middle of the housing (15), and the fracturing water outlet (3) is connected to the main water injection pipe (1) through a fracturing connecting pipe (4).

4. The device for grouting and controlling water in thick coal mine aquifers according to claim 1, characterized in that: The crack inducing portion includes: An adjustable nozzle (5) is fixed in the middle of the shell (15), one end of the adjustable nozzle (5) is connected to the auxiliary water injection pipe (2) through a connecting pipe (6), and the other end of the adjustable nozzle (5) is arranged toward the rock formation.

5. The device for grouting and controlling water in thick coal mine aquifers according to claim 4, characterized in that: The fixing portion includes: an expansion capsule (7) coaxially fixed to the outside of the housing (15); A sealing iron sheet (8) is coaxially fixed on the outside of the expansion capsule (7); The expansion capsules (7) are arranged in pairs and symmetrically distributed on both sides of the adjustable nozzle (5).

6. The device for grouting and controlling water in thick coal mine aquifers according to claim 1, characterized in that: The upper splicing portion comprises: An external screw joint (14) is fixed at the top center of the housing (15). The external screw joint (14) is hollow, and the bottom end of the external screw joint (14) is connected to the top of the main water injection pipe (1) through the main water injection pipe valve (11).

7. The device for grouting and controlling water in thick coal mine aquifers according to claim 6, characterized in that: The lower splicing portion comprises: An internal screw groove (13) is provided at the bottom of the housing (15), the internal screw groove (13) matches the external screw joint (14), the internal screw groove (13) is hollow, and the internal screw groove (13) is communicated with the bottom of the main water injection pipe (1).

8. The device for grouting and controlling water in a thick coal mine aquifer according to claim 7, characterized in that: When the internal screw groove (13) needs to be sealed, the internal thread of the internal screw groove (13) is matched with a sealing steel plug (12).

9. The device for grouting and controlling water in thick coal mine aquifers according to claim 1, characterized in that: The lower splicing portion of the first adjustable nozzle sealer is detachably connected to the upper splicing portion of the second adjustable nozzle sealer, the housings (15) of the two adjacent adjustable nozzle sealers are fixed by a multi-section connecting and fixing device (20), and the upper splicing portion of the adjustable nozzle sealer at the front end is connected to the liquid outlet end of the fracturing high-pressure pump station (23).

10. A method for implementing water control by stratified fracturing grouting, using a stratified fracturing grouting water control device for thick aquifers in coal mines according to any one of claims 1 to 9, characterized in that: include: Determine the location of the soft rock layer (25); drilling; Adjust the angle of the crack inducing portion of each of the layered fracturing grouting and water control devices as needed; Pushing the layered fracturing grouting water control device to the soft rock layer (25); Injecting high-pressure water into the soft rock layer (25) through the layered fracturing grouting water control device, forming induced cracks (21) in the soft rock layer (25) through the crack inducing part, and forming a crack network (22) along the induced cracks (21); Grouting is injected into the crack network (22) to form a grouting area (26).

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