Long drill hole hydraulic fracturing device

Abstract

The utility model provides a long drill hole hydraulic fracturing device, which belongs to the technical field of hydraulic fracturing and comprises a water injection pipe positioned in a fracturing hole, one end of the water injection pipe is connected with a hole sealing device, the hole sealing device is connected with a drill bit, and when in a positioning state, the other end of the water injection pipe is connected with a drilling machine through a drill rod. The other end of the water injection pipe is connected with a high-pressure water injection device through a second pipeline, and the high-pressure water injection device is connected with a power supply and a water supply device through a first pipeline; according to the utility model, the water injection pipe and the hole sealing device can be conveyed to a target position in a long hole and can also be smoothly withdrawn, the situation that the hole sealing device cannot withdraw due to hole clamping is avoided, high-pressure water is input into the hole sealing device through the water injection pipe, coal and rock mass fracturing is carried out, the construction efficiency is greatly improved, the construction risk is reduced, and the construction cost is reduced. And meanwhile, drilling deformation can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic fracturing, in particular to a long borehole hydraulic fracturing device. Background Art

[0002] Hydraulic fracturing technology originated in the United States in 1947. Initially used primarily for the development of low-permeability oil and gas fields, it is now widely used in conventional oil and gas extraction, shale oil and gas development, coalbed methane development, ground stress measurement, geothermal resource development, nuclear waste disposal, and CO2 storage. The application of hydraulic fracturing in coal mining is primarily focused on surrounding rock control and permeability enhancement in low-permeability coal seams. It is primarily used to control the hard, difficult-to-collapse roof of mining faces, relieve pressure in high-stress roadway surrounding rock, prevent rock bursts, and enhance gas permeability in low-permeability coal seams. This technology essentially involves injecting high-pressure water into a borehole to create fractures in the coal rock mass, thereby weakening it.

[0003] Currently, the underground construction method for this technology in coal mining involves constructing a fracturing borehole according to the design, inserting a packer and water injection pipe to the designed location, connecting a water tank, a high-pressure pump, and the water injection pipe. The pump is then turned on to inject high-pressure water, causing the packer to expand and seal the hole. The high-pressure water then flows out of the screen between the two packer sections, fracturing the coal and rock mass. However, this construction method has the following drawbacks: First, after the fracturing long borehole is completed, it is prone to deformation due to in-situ stress and mining pressure, making it impossible to insert the packer and water injection pipe into the designed location; second, the packer and water injection pipe can easily become stuck in the fracturing long borehole, increasing construction risks. Utility Model Content

[0004] The purpose of the utility model is to provide a long borehole hydraulic fracturing device to overcome the problems existing in the prior art. The utility model can realize ordinary long borehole hydraulic fracturing, quantitative water supply, greatly improve construction efficiency, reduce construction risks, and at the same time avoid borehole deformation, so that the sealer can not only be smoothly delivered to the target position in the long hole, but also will not get stuck in the hole and become unable to exit.

[0005] In order to achieve the above-mentioned purpose, the technical solutions adopted by the present invention are as follows:

[0006] A long borehole hydraulic fracturing device comprises a water injection pipe located in a fracturing hole, one end of the water injection pipe is connected to a hole sealing device, and the hole sealing device is connected to a drill bit;

[0007] When in the positioning state, the other end of the water injection pipe is connected to the drilling rig through the drill rod;

[0008] When in a hydraulic fracturing state, the other end of the water injection pipe is connected to a high-pressure water injection device through a second pipeline, the high-pressure water injection device is connected to a power supply, and the high-pressure water injection device is connected to a water supply device through a first pipeline;

[0009] Furthermore, the sealing device includes a first sealing device, and the first sealing device is fixed to a second sealing device via a connecting piece;

[0010] Furthermore, the connecting piece is specifically a screen tube;

[0011] Furthermore, the high-pressure water injection device is specifically a high-pressure water injection pump, and a water inlet is provided on the top of the high-pressure water injection pump, and the water inlet is connected to the water supply device through a first pipeline;

[0012] Furthermore, a water outlet is provided on the side of the high-pressure water injection pump, and the water outlet is connected to the water injection pipe through a second pipeline;

[0013] Furthermore, the water outlet is sequentially connected to a pressure relief valve, a quick connector and a water injection pipe through a second pipeline;

[0014] Furthermore, a pressure gauge is installed on the top of the high-pressure water injection pump;

[0015] Furthermore, the water supply device includes a water tank, a water inlet is installed on the top of the water tank, and a water outlet is provided on the side of the water tank;

[0016] Furthermore, the water outlet of the water tank is connected to a flow meter via a first pipeline, and the flow meter is connected to a high-pressure water injection device via the first pipeline;

[0017] Furthermore, the first pipeline is a water inlet hose, and the second pipeline is a water outlet hose.

[0018] The above technical solution has the following advantages or beneficial effects:

[0019] The utility model provides a long borehole hydraulic fracturing device, which can send the water injection pipe and the hole sealing device to the target position in the long hole through the drilling rig, and can also be smoothly withdrawn, avoiding the situation where the hole sealer is stuck in the hole and cannot be withdrawn; the high-pressure water injection device can generate high-pressure water and control the water pressure and flow rate, the water supply device can realize quantitative water supply to improve the water supply efficiency, and the high-pressure water is input to the hole sealing device through the water injection pipe, and the coal rock is fractured, which greatly improves the construction efficiency, reduces the construction risk, and can also avoid the deformation of the borehole.

[0020] Furthermore, the first sealer and the second sealer are fixed by a screen pipe, so that the hole is sealed after the high-pressure water is injected and expanded, so that a closed space is generated between the first sealer and the second sealer.

[0021] Furthermore, the high-pressure water injection pump is powered by electricity and is used to generate high-pressure water and control the water pressure and flow rate to perform coal rock fracturing.

[0022] Furthermore, the pressure relief valve is used to release high-pressure water after fracturing, and the quick connector can be easily connected and disconnected, so that the entire device can respond and operate more quickly during use.

[0023] Furthermore, the pressure gauge can display the working pressure of the high-pressure water injection pump in real time and accurately, so that the operator can intuitively understand the current pressure status to ensure the stability and safety of the operation process.

[0024] Furthermore, the flow meter can monitor and record the amount of water flowing out of the water tank in real time, ensuring that the operator can accurately grasp the water injection volume, thereby avoiding over- or under-injection. By precisely controlling the water injection volume, the operator can ensure that the fracturing fluid is injected into the formation in the best condition, thereby improving the fracturing effect.

[0025] Furthermore, the water inlet hose is used to transport static pressure water from the water tank to the high-pressure water injection pump, and the water outlet hose is used to transport high-pressure water to the water injection pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the positioning structure of a long-borehole hydraulic fracturing device of the utility model;

[0027] Figure 2 This is a schematic diagram of the hydraulic fracturing state structure of a long-borehole hydraulic fracturing device of the utility model;

[0028] In the figure, 1-drilling rig; 2-water injection pipe; 3-first hole sealer; 31-second hole sealer; 4-drill bit; 5-water inlet; 6-water tank; 7-flow meter; 8-high-pressure water injection pump; 9-water inlet hose; 10-pressure gauge; 11-water outlet hose; 12-pressure relief valve; 13-quick connector. DETAILED DESCRIPTION

[0029] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally located component. When a component is considered to be "disposed on" another component, it may be directly disposed on the other component or there may be a centrally located component.

[0031] In addition, the terms "long", "short", "inside", "outside", etc. that indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention. They do not indicate or imply that the device or component referred to must have this specific orientation or operate in a specific orientation structure, and should not be understood as a limitation of the present invention.

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Example 1:

[0034] The utility model provides a long borehole hydraulic fracturing device, comprising a water injection pipe 2 located in a fracturing hole, one end of the water injection pipe 2 being connected to a hole sealing device, the hole sealing device being connected to a drill bit 4, the hole sealing device comprising a first hole sealing device 3, the first hole sealing device 3 being fixed to a second hole sealing device 31 via a connecting piece;

[0035] like Figure 1 As shown, when in the positioning state, the other end of the water injection pipe 2 is connected to the drilling rig 1 through the drill rod; Figure 2 As shown, when in the hydraulic fracturing state, the other end of the water injection pipe 2 is connected to a high-pressure water injection device through a second pipeline, the high-pressure water injection device is connected to a power supply, and the high-pressure water injection device is connected to a water supply device through a first pipeline; the water supply device includes a water tank 6, a water inlet 5 is installed on the top of the water tank 6, a water tank outlet is provided on the side of the water tank 6, the water tank outlet is connected to a flow meter 7 through a first pipeline, the flow meter 7 is connected to the high-pressure water injection device through the first pipeline, the high-pressure water injection device is connected to a power supply, the high-pressure water injection device is specifically a high-pressure water injection pump 8, a water inlet is provided on the top of the high-pressure water injection pump 8, the water inlet is connected to the water supply device through the first pipeline, the water outlet is provided on the side of the high-pressure water injection pump 8, and the pressure relief valve 12, the quick connector 13 and the water injection pipe 2 located in the fracturing hole are sequentially connected through the second pipeline;

[0036] Preferably, the connecting piece is a screen tube;

[0037] Preferably, the first pipeline is a water inlet hose 9, and the second pipeline is a water outlet hose 11;

[0038] Preferably, the water injection pipe 2 is a water injection steel pipe.

[0039] Example 2:

[0040] The utility model provides a long borehole hydraulic fracturing device, such as Figure 1 As shown, when in the positioning state, it includes a drilling rig 1, a water injection pipe 2, a sealing device and a drill bit 4; the drilling rig 1 includes a drill pipe for drilling into the fracturing hole, and sending in and out the water injection pipe 2 and the sealing device; the water injection pipe 2 is used to send the sealing device to the target position and input high-pressure water; the sealing device includes a first sealer 3, a second sealer 31 and a screen pipe; one end of the drilling rig 1 is connected to the water injection pipe 2, the sealing device and the drill bit 4 in the fracturing hole in sequence through the drill pipe, the first sealer 3 of the sealing device is fixed to the second sealer 31 through the screen pipe, and is injected with high-pressure water to expand and then used to seal the hole, so that a closed space is generated between the first sealer 3 and the second sealer 31;

[0041] like Figure 2 As shown, when in the hydraulic fracturing state, it includes a water supply device, a high-pressure water injection device, a pressure relief valve 12, a quick connector 13, a water injection pipe 2, a sealing device and a drill bit 4; the water supply device includes a water tank 6, a flow meter 7, a water inlet 5 and a water tank outlet; the high-pressure water injection device includes a high-pressure water injection pump 8, a water inlet, a water outlet and a pressure gauge 10; the water tank 6 is used to store water, and the capacity is not less than 3m 3 The water inlet 5 is installed on the top of the water tank 6 for injecting static pressure water. The water tank outlet is set on the side of the water tank 6. The water tank outlet is connected to the flow meter 7 through the water inlet hose 9. The flow meter 7 is used to monitor the high-pressure water flow rate to ensure that the operator can accurately grasp the water injection volume, thereby avoiding excessive or insufficient situations. By accurately controlling the water injection volume, the operator can ensure that the fracturing fluid is injected into the formation in the best state and improve the fracturing effect. The flow meter 7 is connected to the water inlet of the high-pressure water injection pump 8 through the water inlet hose 9. The high-pressure water injection pump 8 is connected to a power supply. The high-pressure water injection pump 8 is powered by electricity and is used to generate high-pressure water and control water pressure and flow. The water inlet is set At the top of the high-pressure water injection pump 8, the water outlet is set on the side of the high-pressure water injection pump 8. The water outlet is connected to the pressure relief valve 12, the quick connector 13 and the water injection pipe 2 located in the fracturing hole in sequence through the water outlet hose 11. The pressure relief valve 12 is used to release high-pressure water after fracturing is completed. The quick connector 13 can be easily connected and disconnected, so that the entire device can respond and operate more quickly during use. The pressure gauge 10 is installed on the top of the high-pressure water injection pump 8 for monitoring the high-pressure water pressure, so that the operator can intuitively understand the current pressure status to ensure the stability and safety of the operation process. The water injection pipe 2 is connected to the sealing device, and the sealing device is connected to the drill bit 4.

[0042] The structure and working principle of the utility model are further described below:

[0043] The purpose of the present utility model is to provide a long borehole hydraulic fracturing device. When using the device, first positioning is performed, that is, in the positioning state, drilling is carried out by the drilling rig 1, and at the same time, the drill rod slowly rotates to send the water injection pipe 2 and the sealing device to the target position in the fracturing hole, the drill rod is retracted, the drilling rig 1 is removed, and the hydraulic fracturing state is entered. The water injection pipe 2 is connected to the quick connector 13, the pressure relief valve 12 and the water outlet on the side of the high-pressure water injection pump 8 in sequence through the water outlet hose 11, and then the water inlet on the top of the high-pressure water injection pump 8 is connected to the flow meter 7 and the water tank water outlet on the side of the water tank 6 in sequence through the water inlet hose 9. Open the high-pressure water injection pump 8, adjust the pressure, and perform coal (rock) stratum fracturing. Then disconnect the water outlet hose 11 and the water injection pipe 2, reopen the drilling rig 1, that is, re-enter the positioning state, and transport the water injection pipe 2 to other depths in the fracturing hole by slowly rotating the drill rod. Retract the drill rod again, remove the drilling rig 1, and enter the hydraulic fracturing state again. Connect the water injection pipe 2 to the high-pressure water injection pump 8 and the water tank 6, start the high-pressure water injection pump 8, adjust the pressure, and perform coal (rock) stratum fracturing. Repeat the above operations again, and perform the positioning state and hydraulic fracturing state cycle operation until full-borehole fracturing is achieved.

[0044] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A long borehole hydraulic fracturing device, characterized in that: It comprises a water injection pipe (2) located in the fracturing hole, one end of the water injection pipe (2) is connected to a hole sealing device, and the hole sealing device is connected to a drill bit (4); When in the positioning state, the other end of the water injection pipe (2) is connected to the drilling rig (1) via a drill rod; When in a hydraulic fracturing state, the other end of the water injection pipe (2) is connected to a high-pressure water injection device via a second pipeline, the high-pressure water injection device is connected to a power source, and the high-pressure water injection device is connected to a water supply device via a first pipeline.

2. A long-hole hydraulic fracturing device according to claim 1, characterized in that: The hole sealing device comprises a first hole sealer (3), and the first hole sealer (3) is fixed with a second hole sealer (31) via a connecting piece.

3. A long-borehole hydraulic fracturing device according to claim 2, characterized in that: The connecting piece is specifically a screen tube.

4. The long-bore hydraulic fracturing device according to claim 1, characterized in that: The high-pressure water injection device is specifically a high-pressure water injection pump (8), and a water inlet is provided on the top of the high-pressure water injection pump (8), and the water inlet is connected to the water supply device through a first pipeline.

5. The long-borehole hydraulic fracturing device according to claim 4, characterized in that: A water outlet is provided on the side of the high-pressure water injection pump (8), and the water outlet is connected to the water injection pipe (2) via a second pipeline.

6. The long-borehole hydraulic fracturing device according to claim 5, characterized in that: The water outlet is sequentially connected to a pressure relief valve (12), a quick connector (13) and a water injection pipe (2) via a second pipeline.

7. The long-borehole hydraulic fracturing device according to claim 1, characterized in that: A pressure gauge (10) is installed on the top of the high-pressure water injection pump (8).

8. The long-borehole hydraulic fracturing device according to claim 1, characterized in that: The water supply device comprises a water tank (6), a water inlet (5) is installed on the top of the water tank (6), and a water tank outlet is provided on the side of the water tank (6).

9. The long-borehole hydraulic fracturing device according to claim 8, characterized in that: The water outlet of the water tank is connected to a flow meter (7) via a first pipeline, and the flow meter (7) is connected to a high-pressure water injection device via the first pipeline.

10. The long-borehole hydraulic fracturing device according to claim 1, characterized in that: The first pipeline is a water inlet hose (9), and the second pipeline is a water outlet hose (11).

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