CN115822536B - Carbon dioxide injection replacement type coalbed methane acquisition device and application method thereof - Google Patents

Abstract

The invention relates to the technical field of coalbed methane collection, in particular to a carbon dioxide injection replacement type coalbed methane collection device, which includes an air injection cylinder, an air extraction cylinder, a connecting pipe and a partition, and several first through holes are arranged on the gas injection cylinder and the air extraction cylinder , the connecting pipe of the air injection cylinder is provided with an air outlet, the connecting pipe of the air extraction cylinder is provided with an air outlet, the upper and lower sides of the partition are equipped with compressed air components, and the air injection cylinder is located at the coal seam. A closed cylinder is installed on the closed cylinder. There is a second through hole, a driving part is provided on the partition plate of the gas injection cylinder, the driving part drives the closed cylinder to rotate, and the closed cylinder drives the second through hole to rotate to complete the communication and sealing with the first through hole, so as to carry out the carbon dioxide inhalation. The replacement work and the work of sealing the coalbed methane into the gas injection cylinder solve the problem that during the existing carbon dioxide replacement process, the injected carbon dioxide mixes with the carbon dioxide in the coalbed methane, which leads to an excessively high detected content of carbon dioxide, ends the mining of coalbed methane ahead of time, and reduces the cost of coalbed methane. The problem of extraction efficiency.

Description

A carbon dioxide injection displacement coalbed methane collection device and its application method

technical field

The invention relates to the technical field of coalbed methane collection, in particular to a carbon dioxide injection displacement type coalbed methane collection device and a use method thereof.

Background technique

In the mining of coalbed methane, since the competitive adsorption intensity of carbon dioxide is far greater than that of nitrogen, carbon dioxide, as a replacement or displacement of methane in coal seams, has become a new method of intensified development of coalbed methane. In the publication number CN110425003B, a proposal was made The invention patent is a mining method for improving the recovery rate of coalbed methane in vertical wells and directional wells for coalbed methane development. Through the development background of vertical wells and directional wells for coalbed methane, the replacement and displacement of methane by carbon dioxide is used to realize coalbed methane recovery. The efficient exploitation of natural gas can significantly improve the recovery rate of coalbed methane resources.

However, in the above-mentioned patent scheme, there are certain problems. When carbon dioxide is directly injected into the well, part of the carbon dioxide has not been replaced, resulting in high carbon dioxide in the collected coalbed methane. The insufficient collection reduces the efficiency of coalbed methane mining. Therefore, there is an urgent need for a device for efficient replacement of coalbed methane for mining.

Contents of the invention

In view of this, the purpose of the present invention is to propose a carbon dioxide injection displacement coalbed methane collection device and its use method to solve the problem that the injected carbon dioxide is mixed with the carbon dioxide in the coalbed methane during the existing carbon dioxide replacement process, resulting in excessive detection of carbon dioxide. High, ending coalbed methane mining ahead of schedule reduces the efficiency of coalbed methane mining.

Based on the above purpose, the present invention provides a carbon dioxide injection displacement coalbed methane collection device, which includes several displacement gas recovery mechanisms, each displacement gas recovery mechanism includes a gas injection cylinder and an air extraction cylinder, and the outer walls of the gas injection cylinder and the air extraction cylinder There are a number of first through holes communicating with the coal seam, the inside of the gas injection cylinder and the air extraction cylinder are equipped with connecting pipes, the connection pipe of the gas injection cylinder is provided with an air outlet, and the connection pipe of the air extraction cylinder There is an air extraction port on the top, and the connecting pipe is set with partitions for separating the upper and lower coal seams. The upper and lower sides of each partition are equipped with compressed air components, and the gas injection cylinders are located at the coal seam. The closed cylinder that rotates inside the gas injection cylinder, each of the closed cylinders is provided with a number of second through holes corresponding to all the first through holes, and the partition plate of the gas injection cylinder is equipped with A driving member that drives a closed cylinder to rotate;

Among them, the working state of the compressed air components in the gas injection cylinder and the air extraction cylinder is opposite. When the compressed air components in the air injection cylinder are compressed, the compressed air components in the air extraction cylinder perform suction work, so that carbon dioxide gas can quickly enter the coal seam and replace the coalbed methane into the air extraction cylinder. middle.

Preferably, the air outlet is provided with a turbine box, the interior of the turbine box is hinged with turbine blades, the outside of the turbine box is mounted with a generator, and the generator is rotatably connected to the turbine blades, A storage battery is installed on the separator of the air injection cylinder, and the storage battery is electrically connected with the generator, the compressed air assembly and the driving member.

Preferably, an installation ring is provided at the end of the air extraction port away from the air extraction tube, one side of the installation ring is rotatably connected to the air extraction port, and four evenly distributed gas gathering rings are provided on the other side extending outward from the ring. frame, each of the gas gathering frames is fixedly connected to the installation ring, the inlet end of each of the gas gathering frames is set close to the other gas gathering frame, and the gas outlet of each of the gas gathering frames They are all arranged close to the center of the installation ring, a cross is arranged inside the installation ring, a connecting shaft is arranged at the center of the cross, a first bevel gear is arranged on the connecting shaft, and a There is a first motor, the output shaft of the first motor is passed through the inside of the air suction port, the inside of the air suction port is provided with a second bevel gear, and the output shaft of the second bevel gear and the first motor The shaft is rotationally connected, and the second bevel gear meshes with the first bevel gear.

Preferably, an annular groove is provided on the side of the air extraction port away from the air extraction cylinder, an annular protrusion is provided on the side of the installation ring close to the air extraction port, and the annular groove is sleeved on the on the ring bump.

Preferably, the inside of the air collecting frame is provided with inclined plates arranged obliquely.

Preferably, the compressed air assembly includes:

The first connecting rod is passed through the partition, and the first connecting rod is provided with a strip-shaped gap for the ventilation of the upper and lower layers of the partition;

A reciprocating assembly is arranged on the separator, the reciprocating assembly is in transmission connection with the first connecting rod, and the reciprocating assembly is used to drive the first connecting rod to move up and down;

Two pistons are sleeved on the connecting pipe, and one side of each piston is fixedly connected to one end of the first connecting rod.

Preferably, the reciprocating assembly includes:

the mounting plate is vertically arranged on the partition;

The dart board is arranged on the side of the mounting plate away from the first connecting rod, and several evenly distributed limit rods are arranged around the dart board, and each plug of the dart board passes through The rotation passes through the middle of the two limit rods, and each of the limit rods is fixedly connected with the installation plate;

A connecting arm, one end of which is hinged to the first connecting rod, and the other end is hinged to a plug of the dart board;

The second motor is erected on the partition;

The disk is arranged on the side of the dart board away from the connecting arm, the center of the disk is connected to the output shaft of the second motor in rotation, and a part of the disk near the outer circle is connected to the The center of the dartboard is hinged.

Preferably, the driver includes:

The third motor is erected on the partition;

The first gear is rotatably connected to the output shaft of the third motor;

The second connecting rod is arranged on the partition;

a second gear, sleeved on the second connecting rod, and the second gear meshes with the first gear;

A shaft sleeve is sleeved on one end of the second connecting rod, and the shaft sleeve is rotatably connected to the second connecting rod;

The electric push rod is arranged on the partition, and the telescopic rod of the electric push rod is connected to the shaft sleeve through transmission;

Two ring-shaped racks are respectively arranged on the side of the closed cylinder close to the partition;

Two third gears are sheathed on one end of the second connecting rod respectively, and each of the third gears meshes with the ring rack respectively.

Preferably, at least one limit protrusion is provided inside the sleeve, and limit grooves corresponding to all the limit protrusions are provided on the second connecting rod, and each limit The grooves are respectively sleeved on the limit bumps, the bushing is provided with a limit plate, the limit plate is provided with an annular slideway, and the telescopic rod of the electric push rod is provided with a slider. And the slider is arranged in the annular slideway.

A method for using a carbon dioxide injection displacement coalbed methane collection device, comprising the following steps:

S1: Inject carbon dioxide into the connecting tube in the gas injection cylinder, so that the carbon dioxide enters the gas injection cylinder from the gas outlet through the connecting tube;

S2: Drive the closed cylinder to rotate by controlling the driving part, and drive the second through hole to rotate through the closed cylinder to communicate with the first through hole;

S3: Compress the gas through the gas compression component in the gas injection cylinder, extrude carbon dioxide into the coal seam through the second through hole and the first through hole to replace the coalbed methane, and perform the suction work through the gas compression component in the gas extraction tube to make the coal bed methane Quickly enter the air pump, suck the coalbed methane into the connecting pipe through the air suction port, and absorb the coalbed methane in the connecting pipe through the gas collection device on the ground, realizing the rapid replacement of carbon dioxide for coalbed methane collection;

S4: When the carbon dioxide is used up, in order to prevent the coalbed methane from entering the gas injection cylinder, causing part of the coalbed gas to be unable to be collected, the closed cylinder is driven to rotate by controlling the driving part, and the second through hole is driven to rotate through the closed cylinder to close the first through hole, thereby The coalbed gas in the coal seam cannot enter the gas injection cylinder.

Beneficial effects of the present invention: inject carbon dioxide into the connecting pipe of the gas injection cylinder, enter the gas injection cylinder through the gas outlet, drive the closed cylinder to rotate through the driving part, drive the second through hole to rotate through the closed cylinder, and connect the second through hole with the second through hole to rotate. A through hole is connected, and the air compression component of the gas injection cylinder is used for compression work, and the gas compression component of the suction cylinder is used for suction work, so that carbon dioxide can quickly replace the coalbed methane in the coal seam into the suction cylinder, and the coalbed gas is sucked into the connecting pipe through the suction port Take it out to the ground for collection, drive the sealing cylinder to rotate through the driving part to close the first through hole, so that when the carbon dioxide injection stops, the coalbed gas will not enter the gas injection cylinder from the first through hole and cannot be collected, which solves the existing carbon dioxide replacement process In the process, the injected carbon dioxide mixes with the carbon dioxide in the coalbed methane, which leads to the detection of too high carbon dioxide content, which ends the mining of coalbed methane in advance and reduces the efficiency of coalbed methane mining.

Description of drawings

In order to more clearly illustrate the present invention or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are only the present invention. Invention, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work.

FIG. 1 is a schematic plan view of the overall structure of an embodiment of the present invention;

Fig. 2 is a schematic diagram of the three-dimensional structure at the air outlet of the embodiment of the present invention;

Fig. 3 is a three-dimensional structural schematic diagram of a pneumatic assembly according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of the enlarged structure at A in Fig. 3 according to an embodiment of the present invention;

Fig. 5 is a schematic diagram of the three-dimensional structure at the air inlet of the embodiment of the present invention;

Fig. 6 is a schematic diagram of the enlarged structure at B in Fig. 3 according to an embodiment of the present invention;

7 is a schematic diagram of a three-dimensional structure of a driving member according to an embodiment of the present invention;

Fig. 8 is a schematic perspective view of the connection between the second connecting rod and the shaft sleeve according to the embodiment of the present invention.

Labeled in the figure:

1. Air injection cylinder; 2. Air extraction cylinder; 3. First through hole; 4. Connecting pipe; 5. Air outlet; 6. Air extraction port; 7. Partition; 8. Closed cylinder; , turbine box; 11, turbine blade; 12, generator; 13, storage battery; 14, mounting ring; 15, gas collecting frame; 16, cross; 17, connecting shaft; 18, first bevel gear; 19, first Motor; 20, second bevel gear; 21, annular groove; 22, annular projection; 23, inclined plate; 24, first connecting rod; 25, piston; 26, mounting plate; 27, dart board; 28, Limit rod; 29, connecting arm; 30, second motor; 31, disc; 32, third motor; 33, first gear; 34, second connecting rod; 35, second gear; 36, ring rack ; 37, the third gear; 38, axle sleeve; 39, limit projection; 40, limit groove; 41, limit plate; 42, annular slideway; 43, electric push rod; 44, slide block; 45 , Strip notch.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific examples.

It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by those skilled in the art to which the present invention belongs. "First", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Comprising" or "comprising" and similar words mean that the elements or items appearing before the word include the elements or items listed after the word and their equivalents, without excluding other elements or items. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "Down", "Left", "Right" and so on are only used to indicate the relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

As shown in Figures 1 to 8, a carbon dioxide injection displacement coalbed methane collection device includes several displacement gas recovery mechanisms, each displacement gas recovery mechanism includes a gas injection cylinder 1 and an air extraction cylinder 2, the gas injection cylinder 1 and the gas extraction cylinder The outer wall of the air extractor 2 is provided with several first through holes 3 communicating with the coal seam, the inside of the air injection cylinder 1 and the air extractor 2 are provided with connecting pipes 4, and the connecting pipe 4 of the air injector 1 is provided with There is an air outlet 5, and the connecting pipe 4 of the air extractor 2 is provided with an air outlet 6, and the connecting pipe 4 is provided with a partition 7 for separating the upper and lower coal seams, and the upper and lower sides of each partition 7 All are equipped with compressed air components, and the gas injection cylinder 1 is located at the coal seam and is equipped with a closed cylinder 8 that can rotate inside the gas injection cylinder 1, and each of the closed cylinders 8 is provided with several A corresponding second through hole 9, and the partition plate 7 of the gas injection cylinder 1 is provided with a driving member that can independently drive a closed cylinder 8 to rotate through adjustment;

Wherein, the working state of the compressed air component in the gas injection cylinder 1 and the air extraction cylinder 2 is opposite. When the compressed air component in the gas injection cylinder 1 is compressed, the compressed air component in the air extraction cylinder 2 performs suction work, so that the carbon dioxide gas can quickly enter the coal seam and reduce the coalbed methane. Replace it into the aspirator 2.

By injecting carbon dioxide into the connecting pipe 4 of the gas injection cylinder 1, and entering the gas injection cylinder 1 through the gas outlet 5, the closed cylinder 8 is driven to rotate through the driving member, and the second through hole 9 is driven to rotate through the closed cylinder 8, and the second through hole is passed through the second through hole. 9 communicates with the first through hole 3, and the air compression component of the gas injection cylinder 1 performs gas compression work, and the gas compression component of the air extraction cylinder 2 performs air suction work, so that the carbon dioxide quickly replaces the coalbed methane in the coal seam into the air extraction cylinder 2, through the suction The gas port 6 takes the coalbed methane suction connection pipe 4 out to the ground for collection. When the air compressor assembly of the gas injection cylinder 1 is inhaling, the driving part drives the sealing cylinder 8 to rotate to close the first through hole 3, so that the gas injected into the coal seam The carbon dioxide will not flow back. When the injection of carbon dioxide stops, the driving part drives the closed cylinder 8 to rotate to close the first through hole 3, so that the coalbed gas will not enter the gas injection cylinder 1 from the first through hole 3 and cannot be collected. In the existing carbon dioxide replacement process, the injected carbon dioxide is mixed with the carbon dioxide in the coalbed methane, resulting in an excessively high detected carbon dioxide content, ending coalbed methane mining ahead of time, and reducing the efficiency of coalbed methane mining.

As an optional embodiment, the air outlet 5 is provided with a turbine box 10, the interior of the turbine box 10 is hinged with turbine blades 11, and the outside of the turbine box 10 is erected with a generator 12, and the generator The engine 12 is rotationally connected with the turbine blade 11, and the battery 13 is installed on the partition plate 7 of the gas injection cylinder 1, and the battery 13 is electrically connected to the generator 12, the compressed gas assembly and the driving member. connect.

For example, to inject carbon dioxide into the connecting pipe 4, a booster pump is required. When carbon dioxide enters the turbine box 10 from the air outlet 5, the power brought by the booster pump acts on the turbine blades 11, so that the carbon dioxide drives The turbine blade 11 rotates, drives the generator 12 to work through the turbine blade 11, stores the electric power on the battery 13, and provides power to the compressor assembly and the driving parts through the battery 13, thereby saving power, improving resource utilization, and realizing The problem of using the flow force of injected carbon dioxide to provide power reserve support for the electrical equipment in the gas injection cylinder 1 .

As an optional embodiment, an installation ring 14 is provided at the end of the air extraction port 6 away from the air extraction cylinder 2, one side of the installation ring 14 is rotatably connected with the air extraction port 6, and the other side extends out of the ring There are four evenly distributed gas-gathering frames 15, each of which is fixedly connected to the installation ring 14, and the inlet end of each of the gas-gathering frames 15 is respectively close to the other gas-gathering frame Frame 15 is arranged, and the gas outlet end of each described gas gathering frame 15 is all arranged near the center of described installation ring 14, and the inside of described installation ring 14 is provided with cross 16, and the center of described cross 16 is provided with connecting shaft 17. The connecting shaft 17 is provided with a first bevel gear 18, and the air suction port 6 is provided with a first motor 19, and the output shaft of the first motor 19 is installed inside the air suction port 6, so The inside of the air inlet 6 is provided with a second bevel gear 20, the second bevel gear 20 is rotationally connected with the output shaft of the first motor 19, and the second bevel gear 20 is connected with the first bevel gear 18 engage.

For example, as shown in Figure 5, the first motor 19 drives the second bevel gear 20 to rotate, the second bevel gear 20 drives the first bevel gear 18 to rotate, the first bevel gear 18 drives the connecting shaft 17 to rotate, and through the connection The shaft 17 drives the cross 16 to rotate. The cross 16 drives the installation ring 14 to rotate. The coalbed methane is quickly taken out from the gas extraction port 6 into the connecting pipe 4 and collected on the ground, so that the problem of improving the absorption efficiency of the coalbed methane is realized.

As an optional embodiment, an annular groove 21 is provided on the side of the suction port 6 away from the suction tube 2 , and an annular protrusion 22 is provided on the side of the mounting ring 14 close to the suction port 6 , and The annular groove 21 is sleeved on the annular protrusion 22 .

For example, as shown in FIGS. 4 to 5 , by setting the annular groove 21 on the suction port 6 , by setting the annular protrusion 22 on the mounting ring 14 , and by setting the annular protrusion 22 in the annular groove 21 , Therefore, when the mounting ring 14 is rotated, it will not break away from the air suction port 6 , and the problem of limiting the rotation of the mounting ring 14 on the air suction port 6 is realized.

As an optional embodiment, the inside of the gas collecting frame 15 is provided with a sloping plate 23 arranged obliquely.

By setting the inclined plate 23 in the gas gathering frame 15, on the one hand, it is used to reduce the resistance of the gas gathering frame 15 due to the rotation of the coal bed gas, and on the other hand, it is used to improve the efficiency of the coal bed gas entering the installation ring 14.

As an optional embodiment, the pneumatic assembly includes:

The first connecting rod 24 is passed through the partition 7, and the first connecting rod 24 is provided with a strip-shaped gap 45 for the upper and lower layers of the partition 7 to ventilate;

The reciprocating assembly is arranged on the partition plate 7, the reciprocating assembly is in transmission connection with the first connecting rod 24, and the reciprocating assembly is used to drive the first connecting rod 24 to move up and down;

Two pistons 25 are sleeved on the connecting pipe 4 , and one side of each piston 25 is fixedly connected to one end of the first connecting rod 24 respectively.

For example, as shown in Figure 1 and Figure 3, when there are upper and lower coal seams, in order to reduce energy consumption, the first connecting rod 24 is driven to move up and down by the reciprocating assembly, and the two pistons 25 are driven to move synchronously by the first connecting rod 24 , so that the pistons 25 corresponding to other coal seams do not need to be provided with a separate power source. By setting a strip-shaped gap on the first connecting rod 24 for ventilation, the two pistons can move up and down, and a power source drives the pistons of other coal seams. 25 simultaneous moving issues.

As an optional embodiment, the reciprocating assembly includes:

The mounting plate 26 is vertically arranged on the partition plate 7;

The dart board 27 is arranged on the side of the mounting plate 26 away from the first connecting rod 24, and several evenly distributed limit rods 28 are arranged around the dart board 27. The dart board 27 Each of the plugs is rotated through the middle of the two limiting rods 28, and each of the limiting rods 28 is fixedly connected to the mounting plate 26;

Connecting arm 29, one end of which is hinged with the first connecting rod 24, and the other end is hinged with a plug of the dart board 27;

The second motor 30 is erected on the partition 7;

A disk 31 is arranged on the side of the dart board 27 away from the connecting arm 29, the center of the disk 31 is connected to the output shaft of the second motor 30 in rotation, and the disk 31 is close to the outer circle One of them is hinged with the center of the dartboard 27.

For example, as shown in Figure 6, the second motor 30 drives the disc 31 to rotate, and the disc 31 drives the dart board 27 to rotate centrifugally in the limit rod 28, and is limited by the limit rod 28, so that the dart board The plug of 27 is inserted into the two limit rods 28 to rotate and move, and the connecting arm 29 on a plug of the dart board 27 always moves vertically up and down, and the connecting arm 29 drives the first connecting rod 24 to move up and down. The rod 24 drives the piston 25 to move up and down, so that the carbon dioxide enters the coal seam quickly under the action of pressure.

As an optional embodiment, the driver includes:

The third motor 32 is erected on the partition 7;

The first gear 33 is rotatably connected with the output shaft of the third motor 32;

The second connecting rod 34 is passed through the partition plate 7;

The second gear 35 is sleeved on the second connecting rod 34, and the second gear 35 is engaged with the first gear 33;

A shaft sleeve 38 is sleeved on one end of the second connecting rod 34, and the shaft sleeve 38 is rotationally connected to the second connecting rod 34;

The electric push rod 43 is arranged on the partition plate 7, and the telescopic rod of the electric push rod 43 is connected to the shaft sleeve through transmission;

Two ring racks 36 are respectively arranged on the side of the closed cylinder 8 close to the partition 7;

Two third gears 37 are sheathed on one end of the second connecting rod 34 respectively, and each of the third gears 37 meshes with the ring rack 36 respectively.

For example, as shown in Figure 7, the third motor 32 drives the first gear 33 to rotate, the first gear 33 drives the second gear 35 to rotate, and the second gear 35 drives the second connecting rod 34 to rotate. The rod 34 drives the third gear 37 to rotate, the third gear 37 drives the ring rack 36 to rotate, and the ring rack 36 drives the closed cylinder 8 to rotate, so that the closed cylinder 8 completes the communication between the second through hole 9 and the first through hole 3 Or to the work of first through hole 3 sealing, drive axle sleeve 38 to move downward by electric push rod 43, drive another third gear 37 to move downward by axle sleeve 38 and mesh with ring rack 36, pass second connecting rod 34 drives the shaft sleeve 38 to rotate, drives the third gear 37 to rotate through the shaft sleeve 38, drives the ring rack 36 to rotate through the third gear 37, and drives another closed cylinder 8 to rotate through the ring rack 36, so that the two closed cylinders 8 It can be adjusted to work independently or synchronously. The working states of the two closed cylinders 8 are opposite, avoiding the phenomenon of backflow in one closed cylinder 8, and avoiding the problem that the coalbed methane in the coal seam cannot be collected in the gas injection cylinder 1.

As an optional embodiment, at least one limiting protrusion 39 is provided inside the sleeve 38, and the second connecting rod 34 is provided with limiting recesses corresponding to all the limiting protrusions 39 one-to-one. Grooves 40, each of the limiting grooves 40 is respectively sleeved on the limiting protrusions 39, the bushing 38 is provided with a limiting disc 41, and the limiting disc 41 is provided with an annular slideway 42 , the telescopic rod of the electric push rod 43 is provided with a slider 44 , and the slider 44 is arranged in the annular slideway 42 .

For example, as shown in Figures 7 to 8, the electric push rod 43 drives the slider 44 to move, the slider 44 drives the annular slideway 42 to move, the annular slideway 42 drives the limit plate 41 to move, and the limit plate 41 drives the third gear 37 to move, and the third gear 37 is separated from the ring rack 36, so that the closed cylinders 8 of different coal seams can be controlled separately. A limit groove 40 is set on the rod 34, and a limit projection 39 is arranged in the limit groove 40. By setting a limit plate 41 on the bushing 38, an annular slideway 42 is set on the limit plate 41, By setting the slide block 44 on the electric push rod 43, and setting the slide block 44 in the annular slideway 42, the second connecting rod 34 will not drive the electric push rod 43 to rotate during the rotation process of the shaft sleeve 38, realizing This solves the problem that the closed cylinders 8 at all coal seams can be controlled individually or synchronously.

A method for using a carbon dioxide injection displacement coalbed methane collection device, comprising the following steps:

S1: Inject carbon dioxide into the connection pipe 4 in the gas injection cylinder 1, so that the carbon dioxide enters the gas injection cylinder 1 through the connection pipe 4 from the gas outlet 5;

S2: Drive the closed cylinder 8 to rotate by controlling the driving part, and drive the second through hole 9 to rotate through the closed cylinder 8 to communicate with the first through hole 3;

S3: Carry out air compression work through the air compressor assembly in the air injection cylinder 1, extrude carbon dioxide through the second through hole 9 and the first through hole 3 into the coal seam to replace the coal bed gas, and perform air suction work through the air compressor assembly in the air extraction cylinder 2 , so that the coalbed methane quickly enters the air pump 2, sucks the coalbed methane into the connecting pipe 4 through the air suction port 6, and absorbs the coalbed methane in the connecting pipe 4 through the gas collecting device on the ground, so as to realize the rapid replacement of carbon dioxide and the collection of coalbed methane;

S4: When the carbon dioxide is used up, in order to prevent the coalbed methane from entering the gas injection cylinder 1, causing part of the coalbed gas to be unable to be collected, the closed cylinder 8 is driven to rotate through the control drive, and the second through hole 9 is driven to rotate through the closed cylinder 8 to make the first through hole 9 rotate. The hole 3 is closed, so that the coalbed gas in the coal seam cannot enter the gas injection cylinder 1 .

Those of ordinary skill in the art should understand that: the discussion of any of the above embodiments is exemplary only, and is not intended to imply that the scope of the present invention (including claims) is limited to these examples; under the idea of the present invention, the above embodiments or Combinations between technical features in different embodiments are also possible, steps may be carried out in any order, and there are many other variations of the different aspects of the invention as described above, which are not presented in detail for the sake of brevity.

The present invention is intended to embrace all such alternatives, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent replacements, improvements, etc. within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. The utility model provides a carbon dioxide injection replacement formula coalbed methane collection system, includes a plurality of displacement adopts gas mechanism, and every displacement adopts gas mechanism all includes gas injection tube (1) and gas extraction tube (2), all be equipped with a plurality of first through-hole (3) with the coalbed intercommunication on the outer wall of gas injection tube (1) and gas extraction tube (2), the inside of gas injection tube (1) and gas extraction tube (2) all is equipped with connecting pipe (4), be equipped with gas outlet (5) on connecting pipe (4) of gas injection tube (1), be equipped with extraction opening (6) on connecting pipe (4) of gas extraction tube (2), characterized in that, all overlap on connecting pipe (4) and be equipped with baffle (7) that are used for separating upper and lower coalbed, every the upside of baffle (7) all is equipped with the subassembly of pressing gas, gas injection tube (1) are located department and all are equipped with sealed tube (8) that can rotate in gas injection tube (1), all be equipped with a plurality of second through-hole (9) with all first through-holes (3) one-to-one on sealed tube (8), and one can drive on the sealed tube (7) through the baffle of individual piece of driving of gas injection tube (1) and one on the baffle (8);

the working states of the air injection cylinder (1) and the air extraction cylinder (2) are opposite, and when the air injection cylinder (1) is used for compressing air, the air injection cylinder (2) is used for sucking air, so that carbon dioxide gas rapidly enters a coal bed to replace the coal bed gas into the air extraction cylinder (2);

the compressor assembly includes:

the first connecting rod (24) is arranged on the partition board (7) in a penetrating way, and a strip-shaped gap (45) for ventilation of the upper layer and the lower layer of the partition board (7) is arranged on the first connecting rod (24);

the reciprocating assembly is arranged on the partition plate (7), is in transmission connection with the first connecting rod (24), and is used for driving the first connecting rod (24) to move up and down;

the two pistons (25) are sleeved on the connecting pipe (4), and one side of each piston (25) is fixedly connected with one end of the first connecting rod (24) respectively.

2. The carbon dioxide injection replacement type coalbed methane collecting device according to claim 1, wherein a turbine box (10) is arranged on the air outlet (5), turbine blades (11) are hinged in the turbine box (10), a generator (12) is arranged on the outer side of the turbine box (10), the generator (12) is rotationally connected with the turbine blades (11), a storage battery (13) is arranged on a partition plate (7) of the air injection cylinder (1), and the storage battery (13) is electrically connected with the generator (12), the air compressing assembly and the driving piece.

3. The carbon dioxide injection replacement type coalbed methane collecting device according to claim 1, wherein one end of the air extraction opening (6) is far away from the air extraction barrel (2) is provided with a mounting ring (14), one side of the mounting ring (14) is rotationally connected with the air extraction opening (6), the other side of the mounting ring is externally provided with four evenly distributed air collecting frames (15), each air collecting frame (15) is fixedly connected with the mounting ring (14), the air inlet end of each air collecting frame (15) is respectively close to the other air collecting frame (15), the air outlet end of each air collecting frame (15) is respectively close to the center of the mounting ring (14), a cross (16) is arranged in the mounting ring (14), the center of the cross (16) is provided with a connecting shaft (17), the connecting shaft (17) is provided with a first bevel gear (18), the air extraction opening (6) is provided with a first motor (19), the air extraction end of the first motor (19) is respectively close to the other air collecting frame (15) and is provided with a second bevel gear (20) which is engaged with the second bevel gear (20) and is rotationally connected with the first bevel gear (20).

4. A carbon dioxide injection replacement type coalbed methane collection device according to claim 3, wherein an annular groove (21) is formed in one side, away from the air extraction barrel (2), of the air extraction opening (6), an annular protruding block (22) is formed in one side, close to the air extraction opening (6), of the mounting ring (14), and the annular groove (21) is sleeved on the annular protruding block (22).

5. A carbon dioxide injection replacement coal bed gas collection device according to claim 3, wherein an inclined plate (23) arranged obliquely is arranged inside the gas collecting frame (15).

6. A carbon dioxide injection displacement coal bed gas collection device as claimed in claim 1, wherein the shuttle assembly comprises:

a mounting plate (26) vertically provided on the partition plate (7);

the dart board (27) is arranged on one side, far away from the first connecting rod (24), of the mounting plate (26), a plurality of uniformly distributed limiting rods (28) are arranged around the dart board (27), each plug of the dart board (27) is arranged between the two limiting rods (28) in a penetrating manner through rotation, and each limiting rod (28) is fixedly connected with the mounting plate (26);

a connecting arm (29) one end of which is hinged with the first connecting rod (24) and the other end of which is hinged with a plug of the dartboard (27);

a second motor (30) mounted on the partition plate (7);

the disc (31) is arranged on one side, far away from the connecting arm (29), of the dart board (27), the center of the disc (31) is rotationally connected with the output shaft of the second motor (30), and one position, close to the outer circle, of the disc (31) is hinged with the center of the dart board (27).

7. A carbon dioxide injection displacement coal bed gas collection device as claimed in claim 1, wherein the drive member comprises:

a third motor (32) mounted on the partition plate (7);

a first gear (33) rotatably connected to an output shaft of the third motor (32);

the second connecting rod (34) is arranged on the partition board (7) in a penetrating way;

the second gear (35) is sleeved on the second connecting rod (34), and the second gear (35) is meshed with the first gear (33);

the shaft sleeve (38) is sleeved at one end of the second connecting rod (34), and the shaft sleeve (38) is rotationally connected with the second connecting rod (34);

the electric push rod (43) is arranged on the partition board (7), and a telescopic rod of the electric push rod (43) is in transmission connection with the shaft sleeve;

two annular racks (36) respectively arranged on one side of the closed cylinder (8) close to the partition plate (7);

and two third gears (37) are respectively sleeved at the ends of the second connecting rod (34) and the shaft sleeve (38) which are far away from each other, and each third gear (37) is respectively meshed with the annular rack (36).

8. The carbon dioxide injection replacement type coalbed methane collecting device according to claim 7, wherein at least one limiting projection (39) is arranged in the shaft sleeve (38), limiting grooves (40) corresponding to all the limiting projections (39) one by one are formed in the second connecting rod (34), each limiting groove (40) is sleeved on each limiting projection (39), a limiting disc (41) is arranged on the shaft sleeve (38), an annular slideway (42) is arranged on the limiting disc (41), a sliding block (44) is arranged on a telescopic rod of the electric push rod (43), and the sliding block (44) is arranged in the annular slideway (42).

9. The method of using a carbon dioxide injection displacement coal bed gas collection device according to claim 1, comprising the steps of:

s1: injecting carbon dioxide into a connecting pipe (4) in the gas injection cylinder (1), so that the carbon dioxide enters the gas injection cylinder (1) from a gas outlet (5) through the connecting pipe (4);

s2: the closed cylinder (8) is driven to rotate by the control driving piece, and the second through hole (9) is driven to rotate by the closed cylinder (8) and is communicated with the first through hole (3);

s3: the air compressing assembly in the air injecting cylinder (1) is used for compressing air, carbon dioxide is extruded to enter the coal bed through the second through hole (9) and the first through hole (3) to replace coal bed air, the air compressing assembly in the air extracting cylinder (2) is used for sucking air, so that the coal bed air quickly enters the air extracting cylinder (2), the air extracting opening (6) is used for sucking the coal bed air into the connecting pipe (4), and the air collecting device on the ground is used for absorbing the coal bed air in the connecting pipe (4), so that the rapid replacement of the coal bed air by the carbon dioxide is realized;

s4: when the carbon dioxide is used up, in order to avoid coal bed gas to enter the gas injection cylinder (1), partial coal bed gas cannot be collected, the sealing cylinder (8) is driven to rotate through the control driving piece, the second through hole (9) is driven to rotate through the sealing cylinder (8), and the first through hole (3) is sealed, so that the coal bed gas in the coal bed cannot enter the gas injection cylinder (1).

Images