Horizontal well blockage removing and yield increasing coal bed gas device and method

Abstract

The invention relates to the technical field of coalbed methane exploitation, in particular to a horizontal well blockage removing and yield increasing coalbed methane device and method. Comprising an injection system, a pumping system, a monitoring system, a safety system and a propelling system. Modular design and compact layout are adopted, and blockage removal liquid is sprayed into reservoir fractures through injection systems such as a liquid injection pipe, a mounting rod, a mounting opening and a high-pressure spray head; conveying and shunting of the suspended sand blockage removal liquid are realized through pumping systems such as a liquid injection port, a suction pump, a liquid injection pipe, a flowback pipe and a shunting pipe; the sand-suspending plug removal liquid is injected into the horizontal well pipeline through the liquid injection pipe, enters the high-pressure spray head in a split-flow and split-direction mode through the split-flow pipe and enters the reservoir fracture under the pressurization effect of the high-pressure spray head for acidification plug removal, and multiple times of circulating plug removal are completed through multiple times of repeated action. According to the invention, through repeated circulating plug removal, the plug removal and yield increase efficiency is improved, and remarkable economic and social benefits are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of coalbed methane exploitation, in particular to a device and method for removing blockage in a horizontal well and increasing the production of coalbed methane. Background Art

[0002] With the growing global demand for clean energy, the development and utilization of coalbed methane as an important unconventional natural gas resource has received widespread attention. Horizontal well technology, as an efficient coalbed methane extraction method, has been widely used in the production process of coalbed methane. However, due to the particularity of coalbed methane reservoirs, horizontal wells often face many technical difficulties in the extraction process. In the production process of horizontal wells, wellbore blockage is a common problem. The main reasons for blockage include: a large amount of coal powder is easily produced during the mining process of coal seams, and the coal powder is deposited in the wellbore, resulting in a reduction or even blockage of the air flow channel. The minerals in the coal seam water precipitate on the inner wall of the wellbore to form a scale layer, which affects the flow of gas. The colloid and asphaltene in the coalbed methane gather in the wellbore to form a viscous substance, causing the wellbore to be blocked.

[0003] Therefore, the research, development and optimization of horizontal well unblocking and coalbed methane production-increasing equipment are of great significance to improving the efficiency of deep coalbed methane extraction. Summary of the invention

[0004] In view of the deficiencies in the above-mentioned prior art and to solve the problem of frequent blockage and pump jamming in the wellbore during the existing coalbed methane extraction process, the present invention proposes a device and method for unblocking and increasing coalbed methane production in horizontal wells, which improves the efficiency of unblocking and increasing production and improves economic and social benefits.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a device for removing blockage and increasing the production of coalbed methane in a horizontal well, comprising: an injection system, a pumping system, a propulsion system, a monitoring system, and a safety system module;

[0006] The injection system comprises a mounting rod, a mounting port, a high-pressure nozzle, and a reservoir fracture; a plurality of the mounting ports are horizontally arranged on the mounting rod, and the high-pressure nozzles are installed one by one at the mounting ports, and the unblocking liquid is sprayed into the reservoir fracture through the high-pressure nozzle;

[0007] The pumping system includes an injection port, a suction pump, an injection pipe, a return pipe, and a shunt pipe; the lower part of the injection port is connected to the injection pipe, and the suspended sand unblocking liquid is input into the well through the injection pipe. Specifically, a valve is arranged at the lower part of the injection port, and an automatic metering device is arranged at the lower part of the valve. The delivery rate of the unblocking liquid can be monitored and adjusted in real time through the automatic metering device. A corner anti-blocking component is arranged at the corner of the vertical pipe and the horizontal pipe of the injection pipe, which can effectively avoid the reagent from being blocked at the corner. The tail of the pipe is provided with the diverter pipe, where the blocking liquid is diverted in two directions, the transverse part of the return pipe is divided into multiple sections, each section is provided with a pressure gauge, which can monitor the pressure of the liquid flowing in each section of the pipeline in real time, the return pipe is connected to the suction pump, and the suction pump is provided at the tail of the return pipe, which can provide a stable and continuous power source for the process of discharging the liquid, and the other end of the suction pump is connected to the waste liquid treatment tank, and the suction pump and the waste liquid treatment tank are both located above the horizontal ground;

[0008] The propulsion system comprises a motor connection hose, a motor, and a PDC annular drill bit device; the PDC annular drill bit device is connected to the motor through the motor connection hose, the motor connection hose, the motor, and the PDC annular drill bit device are located at the same horizontal line, and a temperature sensor and a humidity sensor are respectively arranged on both sides of the PDC annular drill bit device;

[0009] The monitoring system includes a temperature sensor data display panel and a humidity sensor data display panel, which are used to display the data of the temperature sensor and the humidity sensor obtained in real time respectively;

[0010] The safety system includes a safety valve and an alarm device. When the environmental conditions are beyond the normal range, the safety valve is activated to stop the unblocking work. If the unblocking work is abnormal, the alarm device is activated and the work is stopped for maintenance.

[0011] Furthermore, a laser device is provided on the outer side of the horizontal section of the return pipe.

[0012] Furthermore, the waste liquid treatment box is provided with two adsorption layers. After the excess deblocking liquid is drawn out through the return pipe, the first adsorption layer absorbs the harmful gases such as gas carried out, and the second adsorption layer neutralizes the acidic liquid in the deblocking liquid.

[0013] Furthermore, the PDC annular drill bit device has a plurality of drill bits distributed in an annular manner for cutting.

[0014] The present invention also provides an operating method of a horizontal well unblocking and coalbed methane production increasing device, comprising the following steps:

[0015] S001: Under the action of the propulsion system, the horizontal downhole channel is opened through the PDC annular drill bit device, and the injection system is extended into the horizontal well;

[0016] S002: suspended sand plugging removal fluid is injected through the injection port and transported to the horizontal well pipeline through the injection pipe;

[0017] S003: The unblocking liquid is split in two directions at the diversion pipe and enters multiple installation ports on the installation rod;

[0018] S004: After the plugging-removing fluid is pressurized by a high-pressure nozzle, it is sprayed into the reservoir fractures for acidification and plugging removal;

[0019] S005: Improve the efficiency of unblocking and increasing production through multiple cycles of operation;

[0020] S006: After the unblocking is completed, the excess unblocking liquid is discharged into the waste liquid treatment tank through the return pipe under the action of the suction pump.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention has the effect of efficient unblocking: it can achieve fast and effective unblocking according to different causes of blockage;

[0023] 2. The present invention is easy to operate: the device adopts modular design and compact layout, which reduces the difficulty of operation and improves work efficiency.

[0024] 3. The invention is environmentally friendly and energy-saving: environmental protection and rational use of resources are fully considered during the design process to reduce energy consumption;

[0025] 4. The present invention is economical and practical: by optimizing the design and material selection, the device cost is reduced and the economic benefit is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a schematic structural diagram of a device for removing blockage in a horizontal well and increasing the production of coalbed methane.

[0027] Description of reference numerals:

[0028] 1-injection port; 2-suction pump; 3-injection pipe; 4-flowback pipe; 5-installation rod; 6-installation port; 7-high-pressure nozzle; 8-reservoir fracture; 9-diverter pipe; 10-corner anti-blocking component; 11-pressure gauge; 12-waste liquid treatment box; 13-valve; 14-automatic metering device; 15-temperature sensor data display board; 16-humidity sensor data display board; 17-safety valve; 18-alarm device; 19-connecting motor hose; 20-laser device; 21-motor; 22-PDC annular drill bit device; 23-temperature sensor; 24-humidity sensor. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0030] like Figure 1 As shown, the present invention provides a device for removing blockages in horizontal wells and increasing the production of coalbed methane, including an injection system, a pumping system, a propulsion system, a monitoring system, and a safety system module.

[0031] Specifically, the injection system includes a mounting rod 5, a mounting port 6, a high-pressure nozzle 7, and a reservoir fracture 8; a plurality of mounting ports 6 are horizontally arranged on the mounting rod 5, and high-pressure nozzles 7 are installed one by one at the mounting ports 6, and the deblocking liquid is sprayed into the reservoir fracture 8 through the high-pressure nozzles 7.

[0032] The pumping system includes an injection port 1, a suction pump 2, an injection pipe 3, a return pipe 4, and a shunt pipe 9; the lower part of the injection port 1 is connected to the injection pipe 3, and the suspended sand unblocking liquid is input into the well through the injection pipe 3. Specifically, a valve 13 is provided at the lower part of the injection port 1, and an automatic metering device 14 is provided at the lower part of the valve 13. The automatic metering device 14 can monitor and adjust the delivery rate of the unblocking liquid in real time. A corner anti-blocking component 10 is provided at the corner of the vertical pipe and the horizontal pipe of the injection pipe 3, which can effectively prevent the reagent from being blocked at the corner. A shunt pipe 9 is provided at the tail of the injection pipe 3, and the unblocking liquid is diverted in two directions at the shunt pipe 9.

[0033] The lateral part of the return pipe 4 is divided into multiple sections, each section is provided with a pressure gauge 11, which can monitor the pressure of the liquid flowing in each section of the pipeline in real time. A laser device 20 is provided on the outer side of the horizontal section of the return pipe 4. The return pipe 4 is connected to the suction pump 2, and the suction pump 2 is arranged at the tail of the return pipe 4, which can provide a stable and continuous power source for the process of discharging the liquid. The other end of the suction pump 2 is connected to the waste liquid treatment tank 12, and the suction pump 2 and the waste liquid treatment tank 12 are both located above the horizontal ground; wherein, the waste liquid treatment tank 12 is provided with two adsorption layers, and after the excess deblocking liquid is pumped out through the return pipe 4, the first adsorption layer absorbs the harmful gases such as gas carried out, and the second adsorption layer neutralizes the acidic liquid in the deblocking liquid.

[0034] The propulsion system includes a motor hose 19, a motor 21, and a PDC annular drill bit device 22; the PDC annular drill bit device 22 is connected to the motor 21 through the motor hose 19, and the centers of the motor hose 19, the motor 21, and the PDC annular drill bit device 22 are located on the same horizontal line. A temperature sensor 23 and a humidity sensor 24 are respectively arranged on both sides of the PDC annular drill bit device 22. The PDC annular drill bit device 22 can distribute multiple drill bits in a ring for cutting according to actual conditions.

[0035] There are multiple connecting channels between the return pipe 4 and the mounting rod 5, and a pressure gauge 11 is provided at the connecting channel. When the pressure gauge 11 is monitored to reach a certain value, it means that the unblocking of the suspended sand unblocking liquid is completed. At this time, under the action of the suction pump 2, the waste liquid in the injection pipe is pumped out through the return pipe 4 and enters the waste liquid treatment box 12.

[0036] The monitoring system includes a temperature sensor data display panel 15 and a humidity sensor data display panel 16, which are used to display the data of the temperature sensor 23 and the humidity sensor 24 obtained in real time, respectively.

[0037] The safety system includes a safety valve 17 and an alarm device 18. When the environmental conditions are beyond the normal range, the safety valve 17 is activated to stop the unblocking work. If the unblocking work is abnormal, the alarm device 18 is activated and the work is stopped for maintenance.

[0038] The specific operation steps of the present invention are as follows:

[0039] S001: Under the action of the propulsion system, the horizontal downhole channel is opened through the PDC annular drill bit device 22, and the injection system is extended into the horizontal well;

[0040] S002: suspended sand unblocking liquid is injected through the injection port 1 and transported to the horizontal well pipeline through the injection pipe 3;

[0041] S003: The unblocking liquid is split in two directions at the splitter pipe 9 and enters the multiple installation ports 6 on the installation rod 5;

[0042] S004: After the plugging-removing liquid is pressurized by the high-pressure nozzle 7, it is sprayed into the reservoir fracture 8 to perform acidification and plugging removal;

[0043] S005: Improve the efficiency of unblocking and increasing production through multiple cycles of operation;

[0044] S006: After the unblocking is completed, the excess unblocking liquid is discharged into the waste liquid treatment box 12 through the return pipe 4 under the action of the suction pump.

[0045] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for removing blockage and increasing coalbed methane production in a horizontal well, characterized in that: Including injection system, pumping system, propulsion system, monitoring system, and safety system modules; The injection system comprises a mounting rod (5), a mounting port (6), a high-pressure nozzle (7), and a reservoir fracture (8); a plurality of mounting ports (6) are transversely arranged on the mounting rod (5), and the high-pressure nozzles (7) are installed one by one at the mounting ports (6), and the unblocking liquid is sprayed into the reservoir fracture (8) through the high-pressure nozzles (7); the pumping system comprises an injection port (1), a suction pump (2), an injection pipe (3), a return pipe (4), and a shunt pipe (9); the lower part of the injection port (1) is connected to the injection pipe (3), and the suspended sand unblocking liquid is input into the well through the injection pipe (3); specifically, a valve (13) is arranged at the lower part of the injection port (1), and an automatic metering device (14) is arranged at the lower part of the valve (13), and the unblocking liquid is injected into the well through the injection pipe (3). The automatic metering device (14) can monitor and adjust the delivery rate of the blocking-removing liquid in real time. A corner anti-blocking component (10) is provided at the corner of the vertical pipe and the horizontal pipe of the injection pipe (3). The diversion pipe (9) is provided at the tail of the injection pipe (3). The blocking-removing liquid is diverted in two directions at the diversion pipe (9). The lateral part of the return pipe (4) is divided into multiple sections. Each section is provided with a pressure gauge (11) to monitor the pressure of the liquid flowing in each section of the pipeline in real time. The return pipe (4) is connected to the suction pump (2). The suction pump (2) is provided at the tail of the return pipe (4). The other end of the suction pump (2) is connected to the waste liquid treatment tank (12). The suction pump (2) and the waste liquid treatment tank (12) are both located above the horizontal ground. The propulsion system comprises a connecting motor hose (19), a motor (21), and a PDC annular drill bit device (22); the PDC annular drill bit device (22) is connected to the motor (21) via the connecting motor hose (19); the centers of the connecting motor hose (19), the motor (21), and the PDC annular drill bit device (22) are located on the same horizontal line; and a temperature sensor (23) and a humidity sensor (24) are respectively arranged on both sides of the PDC annular drill bit device (22); The monitoring system comprises a temperature sensor data display panel (15) and a humidity sensor data display panel (16), which are respectively used to display the data of the temperature sensor (23) and the humidity sensor (24) obtained in real time; the safety system comprises a safety valve (17) and an alarm device (18); when the environmental conditions are beyond the normal range, the safety valve (17) is activated to stop the unblocking work; if the unblocking work is abnormal, the alarm device (18) is activated to stop the work for maintenance.

2. The device for removing blockage and increasing coalbed methane production in a horizontal well according to claim 1, characterized in that: A laser device (20) is arranged outside the horizontal section of the flowback pipe (4).

3. The device for removing blockage and increasing coalbed methane production in a horizontal well according to claim 1, characterized in that: The waste liquid treatment box (12) is provided with two adsorption layers. After the excess unblocking liquid is drawn out through the return pipe (4), the first adsorption layer absorbs harmful gases such as gas carried out, and the second adsorption layer neutralizes the acidic liquid in the unblocking liquid.

4. The device for removing blockage and increasing coalbed methane production in a horizontal well according to claim 1, characterized in that: The PDC annular drill bit device (22) has a plurality of drill bit cutters distributed in an annular manner.

5. The method for operating a device for removing blockage and increasing the production of coalbed methane in a horizontal well according to any one of claims 1 to 4, characterized in that: The following steps are involved: S001: Under the action of the propulsion system, the horizontal downhole channel is opened through the PDC annular drill bit device (22), and the injection system is extended into the horizontal well; S002: The suspended sand unblocking liquid is injected through the liquid injection port (1) and transported to the horizontal well pipeline through the liquid injection pipe (3); S003: The unblocking liquid is split in two directions at the diversion pipe (9) and enters the multiple installation ports (6) on the installation rod (5); S004: After the plugging-removing liquid is pressurized by the high-pressure nozzle (7), it is sprayed into the reservoir fracture (8) to perform acidification and plugging removal; S005: Improve the efficiency of unblocking and increasing production through multiple cycles of operation; S006: After the unblocking is completed, the excess unblocking liquid is discharged into the waste liquid treatment tank (12) through the return pipe (4) under the action of the suction pump.

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