Coal mine high-salt mine water reinjection device and treatment method

Abstract

The present invention relates to a high-salt mine water reinjection device for a coal mine, comprising an injection wellbore; a cement fixed well, which is arranged in the injection wellbore; an open casing, which is fixedly arranged in the cement fixed well; an injection pipe, which is inserted in the open casing; a packer, which is provided with a sealing sliding at the lower end of the annulus cavity; an annulus liquid filling device; and a high-pressure water inlet device. A method for treating high-salt mine water in a coal mine, using the above-mentioned reinjection device, comprises the following steps: a high-pressure water inlet device transports high-salt mine water from the coal mine to the bare hole section, and the high-salt mine water from the coal mine is injected into the injection layer through the small holes in the hole wall under the action of pressure and continuously migrates to the depth; the annulus liquid filling device transmits the water pressure in the annulus cavity through the packer, and automatically controls the plunger pump to add water according to the pressure change to prevent the intrusion of mine water due to leakage. The high-salt mine water is blocked by multiple isolation layers and stored in the ground injection layer.

Description

Technical Field

[0001] The invention relates to a coal mine high-salt mine water reinjection device and a treatment method thereof. Background Art

[0002] Coal mine water is one of the five major disasters in coal production. With the continuous expansion of mine mining scope and the gradual extension of production levels, mine water poses a greater threat to coal mine safety production and causes certain pollution to the environment. At the same time, it also greatly increases the production costs of enterprises. If coal mine water is discharged directly without treatment, it will cause certain harm to the ecological environment. In the past, evaporation and crystallization were generally used for coal mine water, but the cost was high. Later, high-salt coal mine water recharge technology was adopted.

[0003] High-salinity mine water recharge refers to the pollutant disposal technology of injecting high-salinity waste liquid from coal mines into the pores of underground porous rocks (irrigation layers) 500-3500 meters below the surface. It is a safe geological environmental technology method to place mine water outside of humans and the biosphere, so that the waste liquid does not participate in the material cycle of humans and organisms.

[0004] However, the current problems with mine water reinjection technology are: high-salt mine water is prone to corrosion and leakage pollution. This is mainly because high-salt mine water is transported to the irrigation layer under high pressure. When the high-salt mine water does not have time to penetrate into the irrigation layer, the water pressure in the irrigation layer will increase, causing the high-salt mine water to infiltrate the remaining isolation layers and aquifers, ultimately leading to groundwater pollution. Summary of the invention

[0005] The technical problem to be solved by the present invention is: to overcome the shortcomings of the prior art, to provide a coal mine high-salt mine water reinjection device and a treatment method thereof, to solve the problem that the current coal mine high-salt mine water reinjection leaks and penetrates into the isolation layer and aquifer, ultimately causing groundwater pollution.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] First aspect:

[0008] A high-salt mine water recharging device is provided, comprising:

[0009] The injection wellbore is excavated in the surface layer, and its lower end passes through multiple isolation layers and aquifers to the injection layer, and is connected to the bare hole section in the injection layer;

[0010] Cement fixed well, set in the wellbore;

[0011] The casing is opened and fixedly set in the cement fixed well, and its lower end is connected with the bare hole section of the injection layer;

[0012] A perfusion pipe is inserted into the open casing, the lower end of which is connected to the bare hole section, and the upper end of which is connected to the first liquid inlet hole of the casing joint. An annular cavity is formed between the outer wall of the perfusion pipe and the inner wall of the open casing, and the upper end of the annular cavity is connected to the second liquid inlet hole in the casing joint;

[0013] The packer is provided with a sealing slide at the lower end of the annulus cavity to separate the annulus cavity from the open hole section;

[0014] An annular space liquid injection device, whose water outlet end is connected to the second liquid inlet hole of the casing joint, and the annular space liquid injection device injects the annular space liquid into the annular space cavity under pressure to balance the pressure difference between the annular space cavity and the bare hole section in the injection well;

[0015] A high-pressure water inlet device, whose water outlet is connected to the first water inlet hole of the casing joint, injects high-salt mine water from the coal mine into the bare hole section of the injection layer through the first liquid inlet hole and the injection pipe at high pressure.

[0016] Furthermore, the annular space liquid filling device comprises

[0017] An annular liquid pool, whose outlet pipe is connected to the second liquid inlet hole through a second liquid inlet pipe;

[0018] A plunger pump is arranged on the second liquid inlet pipe;

[0019] A solenoid valve is arranged on the second liquid inlet pipe;

[0020] The first pressure transmitter is arranged on the second liquid inlet pipe and is suitable for detecting the water pressure in the second liquid inlet pipe and transmitting the water pressure signal to the controller, and the controller controls the opening and closing of the plunger pump and the solenoid valve.

[0021] Furthermore, a gate valve is provided on the second liquid inlet pipe.

[0022] Furthermore, the high-pressure water inlet device comprises

[0023] A check valve is arranged on the sleeve joint, and its water outlet end is connected to the first water inlet hole, and its water inlet end is connected to the three-way pipe;

[0024] The three-way pipe has a water inlet end connected to the first liquid inlet pipe, a first water outlet end connected to the check valve, and a second water outlet end connected to the pressure relief valve.

[0025] Furthermore, the cement fixing well includes

[0026] An upper fixed well and a lower fixed well, wherein the diameter of the upper fixed well is larger than that of the lower fixed well, and an outer casing is arranged in the upper fixed well.

[0027] Furthermore, a second pressure transmitter and a temperature sensor are provided on the first liquid inlet pipe.

[0028] Second aspect:

[0029] A method for treating high-salt mine water in a coal mine is provided, which adopts the above-mentioned reinjection device and comprises the following steps:

[0030] The high-pressure water inlet device transports high-salt mine water from the coal mine to the open hole section. Under the action of pressure, the high-salt mine water from the coal mine is injected into the injection layer through the small holes in the hole wall and continuously moves to the depth, so that the high-salt mine water is blocked by multiple isolation layers and stored in the underground injection layer;

[0031] The annular fluid filling device transmits the water pressure in the annular cavity through the packer, realizes the water pressure monitoring in the open hole section, and automatically controls the plunger pump to add water according to the pressure change to prevent the influx of mine water due to leakage.

[0032] The beneficial effects of the present invention are:

[0033] Under pressure, high-salt mine water is injected into the injection layer through the small holes in the wall of the bare hole section and continuously migrates to the depth, so that the high-salt mine water is blocked by multiple isolation layers and stored in the underground injection layer.

[0034] The annular fluid filling device automatically controls the plunger pump to add fluid according to the pressure changes in the open hole section to prevent the influx of mine water due to leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention is further described below in conjunction with the accompanying drawings.

[0036] Figure 1 and Figure 2 It is a schematic diagram of a high-salt mine water recharging device for a coal mine according to the present invention;

[0037] Among them, 1. injection wellbore, 2. cement fixed well, 21. upper fixed well, 22. lower fixed well, 3. open casing, 4. injection pipe, 5. outer casing;

[0038] 6. annular space liquid filling device, 61. annular space liquid tank, 62. plunger pump, 63. solenoid valve, 64. first pressure transmitter, 65. packer, 66. gate valve, 67. annular space cavity;

[0039] 7. High-pressure water inlet device, 71. Casing joint, 72. Check valve, 73. Tee pipe, 74. Pressure relief valve, 75. First liquid inlet pipe, 76. Second pressure transmitter, 77. Temperature sensor;

[0040] 81. Drinkable lower aquifer, 82. Isolation layer, 83. Aquifer, 84. Irrigation layer, 841. Bare hole section. DETAILED DESCRIPTION

[0041] The present invention will now be further described in conjunction with specific embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0042] Embodiment 1

[0043] like Figure 1 As shown, a high-salt mine water reinjection device for a coal mine comprises

[0044] The injection wellbore 1 is excavated in the surface layer, and its lower end passes through multiple isolation layers 82 and aquifers 83 to the injection layer 84, and is connected with the bare hole section 841 in the injection layer 84;

[0045] A cement fixing well 2 is arranged in the injection well hole 1;

[0046] The casing 3 is opened and fixedly installed in the cement fixing well 2, and its lower end is connected with the bare hole section 841 of the injection layer 84;

[0047] The perfusion pipe 4 is inserted into the open casing 3, the lower end of which is connected to the bare hole section 841, and the upper end of which is connected to the first liquid inlet hole of the casing joint 71. An annular cavity 67 is formed between the outer wall of the perfusion pipe 4 and the inner wall of the open casing 3, and the upper end of the annular cavity 67 is connected to the second liquid inlet hole in the casing joint 71;

[0048] The packer 65 is provided at the lower end of the annulus cavity 67 to seal and slide to separate the annulus cavity 67 from the open hole section 841;

[0049] An annular space liquid injection device 6, whose water outlet end is connected to the second liquid inlet hole of the casing joint 71, and the annular space liquid injection device 6 injects the annular space liquid into the annular space cavity 67 under pressure to balance the pressure difference between the annular space cavity 67 and the open hole section 841 in the injection well;

[0050] The high-pressure water inlet device 7 has a water outlet connected to the first water inlet hole of the casing joint 71 , and the water inlet device injects high-salt mine water from the coal mine into the bare hole section 841 of the injection layer 84 through the first liquid inlet hole and the injection pipe 4 at high pressure.

[0051] In this embodiment, for the surface layer, Figure 1 From top to bottom, there are potable lower aquifer 81, multiple isolation layers 82 alternating with aquifer 83, perfusion layer 84, etc.;

[0052] As for the cement fixing well 2, its lower end extends to the grouting layer 84, and the entire cement fixing well 2 is used to ensure the strength of the grouting well hole 1 to prevent collapse.

[0053] In this embodiment, the packer 65 is an existing product, and details thereof can be found in Baidu Encyclopedia.

[0054] Specifically, as an optional implementation in this embodiment, Figure 1 As shown, the annular space liquid filling device 6 includes

[0055] The annular liquid pool 61 has a water outlet pipe connected to the second liquid inlet hole through a second liquid inlet pipe;

[0056] A plunger pump 62, arranged on the second liquid inlet pipe;

[0057] A solenoid valve 63 is provided on the second liquid inlet pipe;

[0058] The first pressure transmitter 64 is disposed on the second liquid inlet pipe and is suitable for detecting the water pressure in the second liquid inlet pipe and transmitting the water pressure signal to the controller, and the controller controls the opening and closing of the plunger pump 62 and the solenoid valve 63.

[0059] In this embodiment, the annular liquid contained in the annular liquid pool 61 is reclaimed water that meets the surface Class III discharge standard.

[0060] In this embodiment, the solenoid valve 63 is a direct-acting solenoid valve 63 .

[0061] Specifically, as an optional implementation in this embodiment, Figure 1 As shown, a gate valve 66 is provided on the second liquid inlet pipe.

[0062] The gate valve 66 is in a normally open state, and is closed when the annular space liquid filling device 6 needs to be maintained.

[0063] Specifically, as an optional implementation in this embodiment, Figure 1 As shown, the high-pressure water inlet device 7 includes

[0064] The check valve 72 is arranged on the sleeve joint 71, and its water outlet end is connected to the first water inlet hole, and its water inlet end is connected to the three-way pipe 73;

[0065] The three-way pipe 73 has its water inlet end connected to the first liquid inlet pipe 75 , its first water outlet end connected to the check valve 72 , and its second water outlet end connected to the pressure relief valve 74 .

[0066] Specifically, as an optional implementation in this embodiment, a second pressure transmitter 76 and a temperature sensor are provided on the first liquid inlet pipe 75 .

[0067] In this embodiment, the second pressure transmitter 76 is used to monitor the water pressure in the injection pipe, and the temperature sensor monitors the water temperature of the high-salt mine water entering the injection pipe.

[0068] Specifically, as an optional implementation in this embodiment, Figure 1 As shown, the cement fixing well 2 includes

[0069] An upper fixed well 21 and a lower fixed well 22, wherein the diameter of the upper fixed well 21 is larger than that of the lower fixed well 22, and an outer casing 5 is arranged in the upper fixed well 21.

[0070] The casing joint 71 is fixedly arranged in the upper fixing well 21 , and the lower end of the upper fixing well 21 extends to the isolation layer 82 . The upper fixing well 21 ensures the supporting strength of the entire cement fixing well 2 .

[0071] The working principle of the high-salt mine water recharging device of the present invention is as follows:

[0072] The high-salt mine water is input into the check valve 72, the first water inlet hole of the casing joint 71, and the injection pipe 4 in sequence from the first liquid inlet pipe 75 and pumped into the bare hole section 841 of the injection layer 84. The high-salt mine water penetrates the pores of the porous rock, is injected into the injection layer 84 and continuously migrates to the depth, so that the high-salt mine water is blocked by multiple isolation layers 82 and stored in the ground injection layer 84.

[0073] During the injection process of high-salt mine water, if the water pressure is too high, the pressure will be transmitted to the packer 65. The bottom of the packer 65 is pressurized and moves upward to squeeze the annular fluid in the annular cavity 67. The first pressure transmitter 64 on the second liquid inlet pipe monitors the pressure and automatically controls the plunger pump 62 to add water according to the pressure change to prevent the influx of mine water due to leakage, balance the formation pressure to protect the well body, and prevent corrosion and leakage pollution caused by high-salt mine water.

[0074] Embodiment 2

[0075] A method for treating high-salt mine water in a coal mine is provided, which adopts the above-mentioned reinjection device and comprises the following steps:

[0076] The high-pressure water inlet device 7 transports the high-salt mine water of the coal mine into the open hole section 841. Under the action of pressure, the high-salt mine water of the coal mine is injected into the perfusion layer 84 through the small holes in the hole wall and continuously moves to the depth, so that the high-salt mine water is blocked by multiple isolation layers 82 and stored in the ground perfusion layer 84;

[0077] The annular fluid filling device 6 transmits the water pressure in the annular cavity 67 through the packer 65, realizes the water pressure monitoring in the open hole section 841, and automatically controls the plunger pump 62 to add water according to the pressure change to prevent the intrusion of mine water due to leakage.

[0078] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A high-salt mine water recharging device for a coal mine, characterized in that: include The injection wellbore is excavated in the surface layer, and its lower end passes through multiple isolation layers and aquifers to the injection layer, and is connected to the bare hole section in the injection layer; Cement fixed well, set in the wellbore; The casing is opened and fixedly set in the cement fixed well, and its lower end is connected with the bare hole section of the injection layer; A perfusion pipe is inserted into the open casing, the lower end of which is connected to the bare hole section, and the upper end of which is connected to the first liquid inlet hole of the casing joint. An annular cavity is formed between the outer wall of the perfusion pipe and the inner wall of the open casing, and the upper end of the annular cavity is connected to the second liquid inlet hole in the casing joint; The packer is provided with a sealing slide at the lower end of the annulus cavity to separate the annulus cavity from the open hole section; An annular space liquid injection device, whose water outlet end is connected to the second liquid inlet hole of the casing joint, and the annular space liquid injection device injects the annular space liquid into the annular space cavity under pressure to balance the pressure difference between the annular space cavity and the bare hole section in the injection well; A high-pressure water inlet device, whose water outlet is connected to the first water inlet hole of the casing joint, and the water inlet device injects high-salt mine water from the coal mine into the bare hole section of the perfusion layer through the first liquid inlet hole and the perfusion pipe at high pressure; The annular space liquid filling device comprises An annular liquid pool, whose outlet pipe is connected to the second liquid inlet hole through a second liquid inlet pipe; A plunger pump is arranged on the second liquid inlet pipe; A solenoid valve is arranged on the second liquid inlet pipe; The first pressure transmitter is arranged on the second liquid inlet pipe and is suitable for detecting the water pressure in the second liquid inlet pipe and transmitting the water pressure signal to the controller, and the controller controls the opening and closing of the plunger pump and the solenoid valve.

2. The high-salt mine water recharging device for coal mines according to claim 1 is characterized in that: A gate valve is arranged on the second liquid inlet pipe.

3. The high-salt mine water recharging device for coal mines according to claim 1 is characterized in that: The high-pressure water inlet device comprises A check valve is arranged on the sleeve joint, and its water outlet end is connected to the first water inlet hole, and its water inlet end is connected to the three-way pipe; The three-way pipe has a water inlet end connected to the first liquid inlet pipe, a first water outlet end connected to the check valve, and a second water outlet end connected to the pressure relief valve.

4. The high-salt mine water recharging device for coal mines according to claim 1 is characterized in that: The cement fixed well comprises An upper fixed well and a lower fixed well, wherein the diameter of the upper fixed well is larger than that of the lower fixed well, and an outer casing is arranged in the upper fixed well.

5. The high-salt mine water recharging device for coal mines according to claim 3 is characterized in that: A second pressure transmitter and a temperature sensor are arranged on the first liquid inlet pipe.

6. A method for treating high-salt mine water in a coal mine, characterized in that: The reinjection device according to any one of claims 1 to 5 comprises the following steps: The high-pressure water inlet device transports high-salt mine water from the coal mine to the open hole section. Under the action of pressure, the high-salt mine water from the coal mine is injected into the injection layer through the small holes in the hole wall and continuously moves to the depth, so that the high-salt mine water is blocked by multiple isolation layers and stored in the underground injection layer; The annular fluid filling device transmits the water pressure in the annular cavity through the packer, realizes the water pressure monitoring in the open hole section, and automatically controls the plunger pump to add water according to the pressure change to prevent the influx of mine water due to leakage.

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