Underground coal bed gas exploitation and desanding device

Abstract

The utility model relates to the technical field of coal gas mining equipment, and discloses an underground coal bed gas mining and desanding device, a top gas pipeline is arranged at the top of a bottom gas pipeline, a desanding and water filtering assembly is arranged between the bottom gas pipeline and the top gas pipeline, and a desanding and water filtering assembly is arranged between the bottom gas pipeline and the top gas pipeline. The desanding and water filtering assembly is arranged between the bottom gas conveying pipeline and the top gas conveying pipeline, the desanding net barrel in the desanding and water filtering assembly can filter large-particle sand contained in conveyed coal gas, and the dust filtering net can filter fine dust again. After activated aluminum oxide powder is filled in the aluminum oxide storage net cylinder, water molecules contained in the coal gas passing through the aluminum oxide storage net cylinder can be adsorbed and removed, so that water and gravel particles contained in the coal gas discharged outwards can be effectively removed and purified; water is prevented from being mixed with dust particles to adhere to the inner wall of the pipeline, and it is guaranteed that coal gas conveying is safer and more reliable.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal gas mining equipment technical field, concretely is a kind of underground coalbed gas mining and sand removing device. BACKGROUND

[0002] In the process of underground coalbed gas mining, gas needs to be pumped to the ground by pump, but coalbed gas is often accompanied by many impurities such as coal dust and slag, which can cause gas extraction equipment or pipeline blockage during coalbed gas mining, affecting normal coalbed gas mining.

[0003] Chinese patent publication No. CN 217028876 U discloses a kind of underground coalbed gas mining and sand removing device, relating to coal gas mining equipment technical field.The utility model includes cyclone separator and annular jet pump, cyclone separator includes cylinder portion and cone portion, there is an air inlet in one side of cyclone separator cylinder portion, there is an air outlet in the top end of cyclone separator cylinder portion, a guide vane is installed inside the air outlet, cyclone separator cone portion is located below the cylinder portion, there is a sand guide plate in the inner wall of cyclone separator cone portion, a movable module is installed at the outlet of cyclone separator cone portion, and a sand storage tank is provided at the bottom of cyclone separator cone portion.The annular jet pump is installed on the upper part of the cyclone separator, the internal main nozzle is connected with the air outlet of the cyclone separator, and the annular jet pump adopts a multi-nozzle form.The utility model adopts the form of combination of cyclone separator and annular jet pump, and the overall structure is simple, which can achieve the purpose of gas extraction and sand removal.

[0004] The mining device in the above-mentioned patent still has certain deficiencies, and the existing underground coalbed gas mining extraction equipment, when conveying the mined coal gas, contains a large amount of impurities and sand, and a filter screen is provided at the gas extraction end to filter out the large particles of sand and stone in the coal gas, but the common filter screen is simple in structure and can only remove the large particles of sand and stone in the coal gas, and the water molecules contained in the coalbed gas are difficult to remove effectively, so that the water molecules are easily mixed with dust particles and adhere to the inner wall of the gas extraction pipeline, and long-term accumulation can easily cause pipeline blockage, affecting normal mining efficiency. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of underground coal bed gas exploitation and sand removing device, solve the existing underground coal bed gas exploitation with extraction equipment, when conveying the coal gas of exploitation, since the impurity sand in initial coal gas can contain more, and then it is set with filter screen at its gas end portion and is filtered, but the filter screen of commonality is mostly simple structure, only can remove the large particle sand in coal gas, and for the water molecule contained in coal bed gas, it is difficult to effectively remove, and then make water molecule very easily mix with dust particle and adhere in gas extraction pipeline inner wall, long-time accumulation is very easy to cause the blockage problem of pipeline, affect normal exploitation efficiency problem.

[0006] The utility model provides the following technical scheme: a kind of underground coal bed gas exploitation and sand removing device, including bottom gas pipeline, the top of the bottom gas pipeline is provided with top gas pipeline, sand filter water subassembly is set between the bottom gas pipeline and the top gas pipeline;

[0007] The sand filter water subassembly includes the coal gas filter cylinder being set in the top of the bottom gas pipeline, the middle part of the bottom end of the coal gas filter cylinder is equipped with bottom air inlet hole, the top of the bottom gas pipeline is equipped with first connecting flange, the first connecting flange is connected with the coal gas filter cylinder by the first fixed bolt of being set, the top of the bottom air inlet hole is equipped with air inlet pipe, the outer side of the air inlet pipe is equipped with sand removing net cylinder, the bottom end of the sand removing net cylinder is connected with the coal gas filter cylinder, the top of the sand removing net cylinder is equipped with top closure cover, the top closure cover is connected with the sand removing net cylinder by the second fixed bolt of being set, the top of the coal gas filter cylinder is symmetrically equipped with two support blocks, the top of the coal gas filter cylinder is equipped with dust filter screen, the top of the dust filter screen is equipped with aluminium oxide storage net cylinder, the top of the coal gas filter cylinder is equipped with filter cylinder closure cover.

[0008] Preferred technical scheme one: the filter cylinder closure cover is connected with the coal gas filter cylinder by the third fixed bolt of being set uniformly, the middle part of the filter cylinder closure cover is equipped with top air outlet hole.

[0009] Preferred technical scheme two: the bottom end of the top gas pipeline is equipped with second connecting flange, the second connecting flange is connected with the filter cylinder closure cover by the fourth fixed bolt of being set.

[0010] Preferred technical scheme three: the top of the coal gas filter cylinder is open.

[0011] The present scheme can make the impurities filtered after sand removing net cylinder and dust filter screen more convenient to discharge.

[0012] Preferably, the bottom gas conveying pipe and the bottom gas inlet hole are connected through the first connecting flange.

[0013] The sand removal net cylinder, the dust filter net and the activated alumina powder filled in the activated alumina storage net cylinder can better remove water.

[0014] Preferably, the bottom end of the top gas conveying pipe is connected with the top gas outlet hole through the second connecting flange.

[0015] The coal gas with impurities sucked into the bottom gas conveying pipe can be better filtered in the sand removal net cylinder.

[0016] Compared with the prior art, the underground coal bed gas exploitation and sand removal device has the following beneficial effects:

[0017] (1) The sand removal and water filtering assembly is arranged between the bottom gas conveying pipe and the top gas conveying pipe, the sand removal net cylinder in the sand removal and water filtering assembly can filter large sand and stones contained in the conveyed coal gas, the dust filter net can further filter fine dust, the activated alumina powder is filled in the activated alumina storage net cylinder, water molecules contained in the coal gas passing through the activated alumina storage net cylinder can be adsorbed and removed, and thus the water and sand and stone particles contained in the coal gas discharged outward can be effectively removed and purified, the water and dust particles are prevented from adhering to the inner wall of the pipe, and the coal gas conveying is more safe and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structure schematic view of the utility model;

[0019] Figure 2 It is a structure internal section view of the utility model;

[0020] Figure 3 It is a structure schematic view of the utility model; Figure 2 It is a structure enlarged view of the bottom gas inlet hole in the utility model;

[0021] Figure 4 It is a structure schematic view of the utility model; Figure 2 It is a structure enlarged view of the support block in the utility model.

[0022] In the drawing: 1, bottom gas conveying pipe; 2, top gas conveying pipe; 3, sand removal and water filtering assembly;

[0023] 301, coal gas filter cylinder; 302, bottom air inlet hole; 303, first connecting flange; 304, first fixing bolt; 305, air inlet pipe; 306, desanding net cylinder; 307, top closing cover; 308, second fixing bolt; 309, supporting block; 310, dust filter screen; 311, alumina storage net cylinder; 312, filter cylinder closing cover; 313, third fixing bolt; 314, top air outlet hole; 315, second connecting flange; 316, fourth fixing bolt. DETAILED DESCRIPTION

[0024] Please refer to Figures 1-4 ,

[0025] Embodiment one: a downhole coalbed methane exploitation and desanding device, comprising a bottom gas conveying pipeline 1, the top of the bottom gas conveying pipeline 1 is provided with a top gas conveying pipeline 2, and a desanding and water filtering assembly 3 is arranged between the bottom gas conveying pipeline 1 and the top gas conveying pipeline 2.

[0026] The desanding and water filtering assembly 3 comprises a coal gas filter cylinder 301 arranged at the top of the bottom gas conveying pipeline 1, a bottom air inlet hole 302 is formed in the middle of the bottom end of the coal gas filter cylinder 301, a first connecting flange 303 is arranged at the top end of the bottom gas conveying pipeline 1, the first connecting flange 303 is connected with the coal gas filter cylinder 301 through a plurality of first fixing bolts 304 arranged thereon, an air inlet pipe 305 is arranged at the top end of the bottom air inlet hole 302, a desanding net cylinder 306 is arranged on the outer side of the air inlet pipe 305, the bottom end of the desanding net cylinder 306 is connected with the coal gas filter cylinder 301, and a top closing cover 307 is arranged at the top end of the desanding net cylinder 306, the top closing cover 307 is connected with the desanding net cylinder 306 through a plurality of second fixing bolts 308 arranged thereon.

[0027] Two supporting blocks 309 are symmetrically arranged at the top of the inner wall of the coal gas filter cylinder 301, a dust filter screen 310 is arranged at the top of the coal gas filter cylinder 301, an alumina storage net cylinder 311 is arranged at the top end of the dust filter screen 310, a filter cylinder closing cover 312 is arranged at the top end of the coal gas filter cylinder 301, the filter cylinder closing cover 312 is connected with the coal gas filter cylinder 301 through a plurality of third fixing bolts 313 arranged thereon in a uniform manner, a top air outlet hole 314 is formed in the middle of the filter cylinder closing cover 312, a second connecting flange 315 is arranged at the bottom end of the top gas conveying pipeline 2, and the second connecting flange 315 is connected with the filter cylinder closing cover 312 through a plurality of fourth fixing bolts 316 arranged thereon.

[0028] Embodiment two: the difference between this embodiment and embodiment one is that the top end of the coal gas filter cylinder 301 is in an open shape.

[0029] So that the impurities filtered by the desanding net cylinder 306 and the dust filter screen 310 are more convenient to discharge.

[0030] Embodiment three: the difference between this embodiment and embodiment one is that the bottom gas pipeline 1 is connected with the bottom gas inlet hole 302 through the first connecting flange 303.

[0031] The alumina powder filtered through the sand removal screen cylinder 306 and the dust filter screen 310 and filled into the inside of the alumina storage screen cylinder 311 is better discharged after removing the water.

[0032] Embodiment four: the difference between this embodiment and embodiment one is that the bottom end of the top gas pipeline 2 is connected with the top gas outlet hole 314 through the second connecting flange 315.

[0033] The impure gas sucked into the bottom gas pipeline 1 is better filtered into the sand removal screen cylinder 306.

[0034] In this embodiment, since the existing underground coal seam gas exploitation uses the extraction equipment, when the extracted gas is transported, the initial extracted gas contains a large amount of impurities such as sand, and a filter screen is arranged at the gas extraction end for filtering. However, the common filter screen has a simple structure and can only remove the large particle sand in the gas, and it is difficult to effectively remove the water molecules contained in the coal seam gas, so the water molecules are easily mixed with the dust particles and adhered to the inner wall of the gas extraction pipeline. Long-term accumulation can easily cause the pipeline to be blocked, affecting the normal exploitation efficiency.

[0035] In summary, when the user needs to discharge the underground extracted coal seam gas upward through the pipeline, the user can connect the gas discharge pipeline with the bottom gas pipeline 1, so that the impure gas enters the sand removal and water filtration assembly 3 through the bottom gas pipeline 1, and is discharged into the sand removal screen cylinder 306 through the gas inlet pipe 305 in the sand removal and water filtration assembly 3. Since the two ends of the gas inlet pipe 305 are open, the sand removal screen cylinder 306 is sleeved outside the gas inlet pipe 305, and the top of the gas inlet pipe 305 leaves a certain gap with the top end of the sand removal screen cylinder 306, so that the gas passing through the gas inlet pipe 305 can enter the sand removal screen cylinder 306 and be filtered.

[0036] The gas enters the vicinity of the side wall of the gas filter cylinder 301, and then moves upward in the gas filter cylinder 301, and is re-filtered by the dust filter screen 310 in sequence. The inside of the alumina storage screen cylinder 311 is filled with active alumina in advance. The active alumina is a porous and high-dispersion solid material, which has a large specific surface area and many active sites on the surface, has a strong adsorption capacity for water, and has stable chemical properties and high mechanical strength, and can withstand a certain pressure and gas flow impact.

[0037] The moisture in the coal gas passing through the alumina storage net cylinder 311 can be removed and filtered under the adsorption function of the active alumina, and the moisture and sand particles contained in the outward discharged coal gas can be effectively removed and purified, so that the moisture mixed with dust particles is prevented from adhering to the inner wall of the pipeline, and the transportation of the coal gas is more safe and reliable.

Claims

1. A device for coal bed methane extraction and sand removal in a well, comprising a bottom gas pipeline (1), characterized in that: The top of the bottom gas conveying pipeline (1) is provided with a top gas conveying pipeline (2), and a sand removal and water filtering assembly (3) is arranged between the bottom gas conveying pipeline (1) and the top gas conveying pipeline (2). The sand removal and water filtering assembly (3) comprises a gas filtering cylinder (301) arranged at the top of the bottom gas conveying pipeline (1), a bottom gas inlet hole (302) is formed in the middle of the bottom end of the gas filtering cylinder (301), a first connecting flange (303) is arranged at the top end of the bottom gas conveying pipeline (1), the first connecting flange (303) is connected with the gas filtering cylinder (301) through a plurality of first fixing bolts (304) arranged thereon, an air inlet pipe (305) is arranged at the top end of the bottom gas inlet hole (302), a sand removal net cylinder (306) is sleeved outside the air inlet pipe (305), the bottom end of the sand removal net cylinder (306) is connected with the gas filtering cylinder (301), a top closing cover (307) is arranged at the top end of the sand removal net cylinder (306), the top closing cover (307) is connected with the sand removal net cylinder (306) through a plurality of second fixing bolts (308) arranged thereon, two supporting blocks (309) are symmetrically arranged at the top of the inner wall of the gas filtering cylinder (301), a dust filtering net (310) is arranged at the top of the gas filtering cylinder (301), an alumina storage net cylinder (311) is arranged at the top end of the dust filtering net (310), and a filtering cylinder closing cover (312) is arranged at the top end of the gas filtering cylinder (301).

2. The coal bed methane mining and desanding device in a well according to claim 1, characterized in that: A plurality of third fixing bolts (313) are uniformly arranged on the filtering cylinder closing cover (312) and connected with the gas filtering cylinder (301), and a top gas outlet hole (314) is formed in the middle of the filtering cylinder closing cover (312).

3. The coal bed methane mining and desanding device in a well according to claim 2, characterized in that: A second connecting flange (315) is arranged at the bottom end of the top gas conveying pipeline (2), and a plurality of fourth fixing bolts (316) are arranged on the second connecting flange (315) and connected with the filtering cylinder closing cover (312).

4. The coal bed methane mining and desanding device in a well according to claim 3, characterized in that: The top end of the gas filtering cylinder (301) is in an open shape.

5. The coal bed methane extraction and sand removal device of claim 4, wherein: The first connecting flange (303) is arranged between the bottom gas conveying pipeline (1) and the bottom gas inlet hole (302) to realize communication.

6. The coal bed methane extraction and sand removal device of claim 5, wherein: The second connecting flange (315) is arranged at the bottom end of the top gas conveying pipeline (2) to realize communication with the top gas outlet hole (314).

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