Multi-caliber underground pipeline reducing device and using method thereof

Abstract

The invention belongs to the technical field of valve connection, particularly relates to a multi-caliber underground pipeline reducing device and a using method thereof, and is particularly suitable for connection of equipment and pipelines in the coal seam water injection and hydraulic fracturing process. The device comprises a pipeline and a base, and is characterized in that the base comprises an inlet base and an outlet base, the inlet base is provided with at least two insertion openings for inputting rubber pipes, and the diameters of the insertion openings are different; the outlet base is provided with at least two sockets for outputting the rubber tube, and the apertures of the sockets are different; and each socket is communicated with the pipeline. The problem that underground water injection or fracturing pipeline connectors are not matched is solved. By means of the multi-caliber underground pipeline reducing device, random conversion among connectors of various calibers can be achieved, reducing connectors do not need to be machined independently, time is saved, and using is convenient. In addition, a safety valve is arranged on the device, pressure relief can be conducted on the pipeline after the device is used, and the safety performance is greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of valve connection, and specifically relates to a multi-caliber downhole pipeline reducing device and a use method thereof, and is particularly suitable for connecting equipment and pipelines during coal seam water injection and hydraulic fracturing. Background Art

[0002] Coalbed methane is an unconventional clean energy source that has received widespread attention and has been developed on a large scale. However, coal seams are low-porosity and low-permeability reservoirs, and hydraulic fracturing and hydraulic cutting are required to transform the coal seam fracture network. During the fracturing process, there is often a problem of interface mismatch between the equipment and the pipeline. Temporary processing of variable diameter interfaces is time-consuming and laborious, and inconvenient to use. Therefore, a convenient, fast, and safe variable diameter device and method are urgently needed.

[0003] Therefore, in order to ensure better implementation of measures such as hydraulic fracturing and improve the efficiency of coalbed methane extraction, there is an urgent need for a downhole pipeline diameter reducing device that can provide multiple calibers and a method of use. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a multi-caliber downhole pipeline diameter reducing device and a method of using the same, by arranging sockets for input hoses and output hoses of different calibers on the base to adapt to the connection problem of pipelines of different calibers in different devices, thereby achieving convenient, fast and safe diameter reducing connection.

[0005] The technical solution adopted by the present invention is:

[0006] A multi-caliber downhole pipeline diameter-changing device includes a pipeline and a base, characterized in that the base includes an inlet base and an outlet base, at least two input hose sockets are arranged on the inlet base, and the calibers of the sockets are different; at least two output hose sockets are arranged on the outlet base, and the calibers of the sockets are different; each socket is connected to the pipeline.

[0007] Preferably, at least three sockets for input hoses are arranged on the inlet base, and the calibers of the sockets are different; at least three sockets for output hoses are arranged on the outlet base, and the calibers of the sockets are different.

[0008] The inlet base can be provided with 3, 4, 5 or more sockets of different calibers. Similarly, the outlet base can also be provided with 3, 4, 5 or more sockets of different calibers.

[0009] Preferably, each of the sockets is provided with a baffle, a spring is provided in the baffle, and the baffle is connected to the spring.

[0010] Preferably, each baffle is matched with the inner diameter of the socket, and each baffle is blocked at the socket. When the spring is compressed, the baffle moves inward away from the socket when the spring is compressed, and the baffle opens the connecting pipeline.

[0011] Preferably, the inlet base is connected to a flow meter, a pressure gauge and an outlet base in sequence.

[0012] Preferably, a safety valve is provided on the pipeline on the other side of the outlet base opposite to the pressure gauge.

[0013] A method for using a multi-caliber downhole pipeline diameter reducing device comprises the following steps:

[0014] a. Install the multi-caliber downhole pipeline reducer on the hydraulic fracturing device, select an input hose with a diameter that matches that of device A, connect one end of the hose to device A, and insert the other end into a socket with a matching diameter on the inlet base;

[0015] b. Select an output hose with a diameter that matches that of device B, connect one end of the hose to device B, and insert the other end into a socket with a suitable diameter on the outlet base;

[0016] c. Close the valve of the safety valve, adjust the flow rate and pressure according to the flow meter and pressure gauge to supply water; according to the required flow rate and pressure, select equipment with different diameters of input hoses or output hoses to achieve the variable diameter function;

[0017] d. After the water supply is completed, open the safety valve to allow the water in the pipeline to flow out and complete the pressure relief.

[0018] Equipment A and B are equipment commonly used in processes such as hydraulic fracturing processes in coal mines.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention solves the problem of mismatched interfaces of underground water injection or fracturing pipelines. The present invention sets sockets for input hoses and output hoses of different calibers on the base, and the multi-caliber underground pipeline reducer of the present invention can realize arbitrary conversion between multiple caliber interfaces, without the need to separately process the reducer interface, saving time and being easy to use.

[0021] In addition, the device of the present invention is provided with a safety valve, which can relieve the pressure of the pipeline after use, thereby greatly improving the safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the device of the present invention.

[0023] In the figure, 1-inlet base, 2-flow meter, 3-pressure gauge, 4-outlet base, 5-safety valve, 6-spring, 7-baffle, 8-input hose, 9-output hose, 10-plug, 11-socket. DETAILED DESCRIPTION

[0024] The accompanying drawings are only used for illustrative purposes and are only for the convenience of describing the present invention and simplifying the description, and should not be construed as limiting the present invention. In order to make the purpose, technical solution and beneficial effects of the present invention more clear, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0025] Example 1

[0026] A multi-caliber downhole pipeline diameter reducing device includes a pipeline and a base, wherein the base includes an inlet base 1 and an outlet base 4, wherein the inlet base 1 is provided with two sockets 11 for input hoses 8, and the diameters of the sockets 11 are different; the outlet base 4 is provided with two sockets 11 for output hoses 9, and the diameters of the sockets 11 are different; and each socket 11 can be connected to the pipeline. When the input hose 8 and the output hose are inserted into the socket 11 through a plug 10, the pipeline can be connected to allow the water to flow smoothly.

[0027] Example 2

[0028] A multi-caliber downhole pipeline diameter reducing device includes a pipeline and a base, one side of the base is an inlet base 1, and the other side is an outlet base 4. The inlet base 1 is provided with three sockets 11 for input hoses 8, and the calibers of the sockets 11 are different, so that they can match input hoses 8 of different diameters. The outlet base 4 is provided with three sockets 11 for output hoses 9, and the calibers of the sockets 11 are different, so that they can match output hoses 9 of different diameters.

[0029] Each of the sockets 11 is provided with a baffle 7, and a spring 6 is provided inside the baffle 7, and the baffle 7 is connected to the spring 6. Each baffle 7 is adapted to the inner diameter of the socket 11, and each baffle 7 is blocked at the socket 11. When the spring 6 is compressed, the baffle 7 moves inward away from the socket 11 when the spring 6 is compressed, and the baffle 7 is opened to connect the pipeline. That is, the working principle of each baffle 7 and the spring 6 is:

[0030] Initial state: the spring is not compressed, the baffle is closed, and water cannot enter.

[0031] Water flow increases: the water flow hits the baffle, which is pushed open gradually. The spring is compressed in the process and the baffle opens.

[0032] Stable water flow: When the baffle is opened to a certain position, the water flows steadily. At this time, the thrust on the baffle and the elastic force of the spring are balanced.

[0033] Water flow decreases or stops: When the water flow decreases or stops, the spring releases the stored energy, pushing the baffle back to its original position and closing the water flow channel.

[0034] When there is no water flow or the water flow is small, the spring is in an uncompressed state, and the baffle is kept in a closed state under the action of the spring to prevent water from entering.

[0035] When the water flow increases and acts on the baffle, the baffle is pushed by the water flow and overcomes the resistance of the spring and begins to open. As the baffle opens, water can enter the interior of the device.

[0036] When the water flow decreases or stops, the elastic force of the spring resets the baffle and closes the water flow channel again.

[0037] Example 3

[0038] like Figure 1 As shown, a multi-caliber downhole pipeline diameter reducing device includes a pipeline and a base, one side of the base is an inlet base 1, and the other side is an outlet base 4. The inlet base 1 is provided with four sockets 11 for input hoses 8, and the calibers of the sockets 11 are different, so as to match input hoses 8 of different diameters. The outlet base 4 is provided with four sockets 11 for output hoses 9, and the calibers of the sockets 11 are different, so as to match output hoses 9 of different diameters.

[0039] Each of the sockets 11 is provided with a baffle 7, a spring 6 is provided in the baffle 7, and the baffle 7 is connected to the spring 6. Each baffle 7 is adapted to the inner diameter of the socket 11, and each baffle 7 is blocked at the socket 11. When the spring 6 is compressed, the baffle 7 moves inward away from the socket 11 when the spring 6 is compressed, and the baffle 7 is opened to connect the pipeline.

[0040] Preferably, the inlet base 1 is sequentially connected to the flow meter 2, the pressure gauge 3 and the outlet base 4. A safety valve 5 is arranged on the pipeline on the other side of the outlet base 4 opposite to the pressure gauge.

[0041] A method for using a multi-caliber downhole pipeline diameter reducing device comprises the following steps:

[0042] a. Install the multi-caliber downhole pipeline reducer on the hydraulic fracturing device, select an input hose 8 with a diameter matching that of the device A, connect one end of the hose to the device A, and insert the other end into the socket 11 with a matching diameter on the inlet base 1;

[0043] b. Select an output hose 9 with a diameter that matches the device B, connect one end of the hose to the device B, and insert the other end into the socket 11 with a diameter that matches the device B on the outlet base 4;

[0044] c. Close the valve of the safety valve 5, adjust the flow rate and pressure according to the flow meter 2 and pressure meter 3, and supply water;

[0045] Since a plurality of sockets with different calibers are arranged on the multi-caliber downhole pipeline diameter-changing device of the present invention, the diameter of the input hose 8 or the output hose 9 can be switched at any time as needed, and the flow rate and pressure can be adjusted as needed, thereby realizing the diameter-changing function.

[0046] The input hose 8 or the output hose 9 is pressed into the plug 11 through the plug 10, and the water flow impacts the baffle 7, and the baffle 7 is gradually opened by the thrust. The spring 6 is compressed in this process, and the baffle 7 opens.

[0047] After baffle plate 7 is opened to a certain position, water flow passes stably. At this moment, the thrust that baffle plate 7 is subjected to reaches balance with the elastic force of spring 6.

[0048] When the water flow decreases or stops, the spring 6 releases the stored energy, pushing the baffle 7 to return to its original position, thus closing the water flow channel.

[0049] d. After the water supply is completed, open the safety valve 5 to allow the water in the pipeline to flow out and complete the pressure relief.

[0050] Example 4

[0051] A multi-caliber downhole pipeline diameter reducing device includes a pipeline and a base, one side of the base is an inlet base 1, and the other side is an outlet base 4. The inlet base 1 is provided with five sockets 11 for input hoses 8, and the calibers of the sockets 11 are different, so that they can match input hoses 8 of different diameters. The outlet base 4 is provided with five sockets 11 for output hoses 9, and the calibers of the sockets 11 are different, so that they can match output hoses 9 of different diameters.

[0052] Other unmentioned parts are the same as those in Example 3.

[0053] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A multi-caliber downhole pipeline diameter reducing device, comprising a pipeline and a base, characterized in that: The base includes an inlet base and an outlet base. The inlet base is provided with at least two sockets for input hoses, and the calibers of the sockets are different; the outlet base is provided with at least two sockets for output hoses, and the calibers of the sockets are different; and each socket is connected to a pipeline.

2. A multi-caliber downhole pipeline diameter reducing device according to claim 1, characterized in that: The inlet base is provided with at least three sockets for inputting rubber hoses, and the calibers of the sockets are different; the outlet base is provided with at least three sockets for outputting rubber hoses, and the calibers of the sockets are different.

3. A multi-caliber downhole pipeline diameter reducing device according to claim 2, characterized in that: A baffle is arranged in each socket, a spring is arranged in the baffle, and the baffle is connected to the spring.

4. A multi-caliber downhole pipeline diameter reducing device according to claim 3, characterized in that: Each baffle is matched with the inner diameter of the socket, and each baffle is blocked at the socket. When the spring is compressed, the baffle moves inward away from the socket when the spring is compressed, and the baffle opens the connecting pipeline.

5. The multi-caliber downhole pipeline diameter reducing device according to claim 1, characterized in that: The inlet base is connected to the flow meter, the pressure gauge and the outlet base in sequence.

6. A multi-caliber downhole pipeline diameter reducing device according to claim 5, characterized in that: A safety valve is arranged on the pipeline on the other side of the outlet base opposite to the pressure gauge.

7. A method for using a multi-caliber downhole pipeline diameter reducing device according to any one of claims 1 to 6, characterized in that: The steps include: a. Install the multi-caliber downhole pipeline reducer on the hydraulic fracturing device, select an input hose with a diameter that matches that of device A, connect one end of the hose to device A, and insert the other end into a socket with a matching diameter on the inlet base; b. Select an output hose with a diameter that matches that of device B, connect one end of the hose to device B, and insert the other end into a socket with a suitable diameter on the outlet base; c. Close the valve of the safety valve, adjust the flow rate and pressure according to the flow meter and pressure gauge to supply water; according to the required flow rate and pressure, select equipment with different diameters of input hoses or output hoses to achieve the variable diameter function; d. After the water supply is completed, open the safety valve to allow the water in the pipeline to flow out and complete the pressure relief.

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