Horizontal well plugging removal and production coal bed gas device and method

Abstract

The present application relates to coal bed gas mining technical field, specifically speaking, it is a kind of horizontal well plugging removal and production increasing coal bed gas device and method.The device includes five modules of injection system, pumping system, monitoring system, safety system and propulsion system.The device adopts modular design and compact layout, and the plugging removal liquid is injected into reservoir fracture through injection pipe, mounting rod, mounting port and high-pressure spray head in injection system;the pumping system including injection port, suction pump, injection pipe, flow-back pipe and shunt pipe realizes the transportation and shunting of suspended sand plugging removal liquid;the suspended sand plugging removal liquid is injected into horizontal well pipe through injection pipe, and is shunted and directed into high-pressure spray head through shunt pipe, and enters reservoir fracture for acidizing and plugging removal through the pressurizing effect of high-pressure spray head, and the plugging removal is completed through repeated multiple actions and multiple cycles.The present application improves plugging removal and production increasing efficiency through multiple cycles of plugging removal, and has significant economic and social benefits.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coalbed methane extraction, in particular to a horizontal well plugging removal and coalbed methane production increasing device and method. BACKGROUND

[0002] With the increasing demand for clean energy worldwide, coalbed methane, as an important unconventional natural gas resource, has attracted widespread attention for its development and utilization. Horizontal well technology, as an efficient method for coalbed methane extraction, 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 during production. During the production of horizontal wells, wellbore plugging is a common problem. The main reasons for plugging include: a large amount of coal powder is easily produced during the production of coal seams, which deposits in the wellbore, resulting in a decrease in gas flow passage or even plugging. Minerals in coalbed water deposit on the inner wall of the wellbore, forming a scale layer that affects gas flow. Gums and asphaltenes in coalbed methane accumulate in the wellbore, forming viscous substances that cause wellbore plugging.

[0003] Therefore, it is of great significance to develop and optimize the horizontal well plugging removal and coalbed methane production increasing device for improving the efficiency of deep coalbed methane extraction. SUMMARY

[0004] In view of the above-mentioned problems in the prior art, to solve the problem of frequent plugging and pump sticking in the wellbore during the production of coalbed methane, the present application provides a horizontal well plugging removal and coalbed methane production increasing device and method, which improves the plugging removal and production increasing efficiency and improves the economic and social benefits.

[0005] In order to achieve the above-mentioned purpose, the present application provides a horizontal well plugging removal and coalbed methane production increasing device, which comprises: a jetting system, a pumping system, a propulsion system, a monitoring system and a safety system module.

[0006] The jetting system comprises a mounting rod, a mounting port, a high-pressure nozzle and a reservoir fracture. A plurality of mounting ports are arranged transversely on the mounting rod, and the high-pressure nozzles are installed one by one at the mounting ports. The plugging removal liquid is injected into the reservoir fracture through the high-pressure nozzles.

[0007] The pumping system comprises a liquid injection port, a suction pump, a liquid injection pipe, a return pipe and a shunt pipe; the lower part of the liquid injection port is connected with the liquid injection pipe, and the sand unblocking liquid is input into the downhole through the liquid injection pipe; specifically, the lower part of the liquid injection port is provided with a valve, and the lower part of the valve is provided with an automatic metering device; the automatic metering device can be used to monitor and adjust the delivery rate of the unblocking liquid in real time; a corner anti-blocking component is arranged at the corner between the vertical pipe and the horizontal pipe of the liquid injection pipe, which can effectively prevent the reagent from being blocked at the corner; the tail part of the liquid injection pipe is provided with the shunt pipe, and the unblocking liquid is shunted in two directions at the shunt pipe; the horizontal part of the return pipe is divided into multiple sections, and each section is provided with a pressure gauge, which can be used to monitor the pressure of the liquid flowing in each section in real time; the return pipe is connected with the suction pump, the suction pump is arranged at the tail part of the return pipe, and the suction pump can provide a stable and continuous power source for the process of discharging the liquid; the other end of the suction pump is connected with a waste liquid treatment tank, and the suction pump and the waste liquid treatment tank are located above the horizontal ground;

[0008] The propulsion system comprises a connecting motor hose, a motor and a PDC ring bit device; the PDC ring bit device is connected with the motor through the connecting motor hose; the connecting motor hose, the motor and the PDC ring bit device are located on the same horizontal line; temperature sensors and humidity sensors are arranged on the two sides of the PDC ring bit device;

[0009] The monitoring system comprises temperature sensor data display boards and humidity sensor data display boards, which are used to display the data of the temperature sensors and the humidity sensors obtained in real time, respectively.

[0010] The safety system comprises a safety valve and an alarm device; when the environmental conditions exceed the normal range, the safety valve is started to stop the unblocking work; if the unblocking work is abnormal, the alarm device is started to stop the work for maintenance.

[0011] Further, a laser device is arranged outside the horizontal section of the return pipe.

[0012] Further, the waste liquid treatment tank is provided with two adsorption layers; after the excess unblocking liquid is extracted through the return pipe, the harmful gas such as gas carried out by the unblocking liquid is absorbed through the first adsorption layer, and the acidic liquid in the unblocking liquid is neutralized through the second adsorption layer.

[0013] Further, the PDC ring bit device is provided with multiple ring-distributed drill bit cutters.

[0014] The application also provides an operation method of the horizontal well unblocking and coalbed methane production increasing device, which comprises the following steps:

[0015] S001: Under the action of the propulsion system, the downhole passage of the horizontal well is opened through the PDC ring bit device, and the injection system is stretched into the horizontal well.

[0016] S002: The sand plugging solution is injected through the liquid injection port and transported to the horizontal well pipe through the liquid injection pipe;

[0017] S003: The plugging solution realizes two-way distribution at the distribution pipe and enters the multiple installation ports on the installation rod;

[0018] S004: After the plugging solution is pressurized by the high-pressure nozzle, it is sprayed into the reservoir fracture for acidizing and plugging removal;

[0019] S005: Through multiple circulation operations, the plugging removal and production increasing efficiency is improved;

[0020] S006: After the plugging removal is completed, the excess plugging removal solution 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 beneficial effects of the present application are:

[0022] 1. The present application has the effect of efficient plugging removal: it can realize rapid and effective plugging removal for different plugging reasons;

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

[0024] 3. The present application is environmentally friendly and energy-saving: environmental protection and resource rational utilization are fully considered in the design process, and energy consumption is reduced;

[0025] 4. The present application is economical and practical: through optimization design and material selection, the device cost is reduced and the economic benefit is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structure schematic view of the horizontal well plugging removal and production increasing coal bed methane device.

[0027] MARKING OF THE DRAWINGS:

[0028] 1-liquid injection port; 2-suction pump; 3-liquid injection pipe; 4-return pipe; 5-installation rod; 6-installation port; 7-high-pressure nozzle; 8-reservoir fracture; 9-distribution pipe; 10-corner anti-blocking component; 11-pressure gauge; 12-waste liquid treatment tank; 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-connection motor hose; 20-laser device; 21-motor; 22-PDC ring bit device; 23-temperature sensor; 24-humidity sensor. DETAILED DESCRIPTION

[0029] Preferred embodiments of the present application will be described in more detail below. Although the following describes preferred embodiments of the present application, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present application is more thoroughly and completely conveyed to those skilled in the art, and the scope of the present application is fully conveyed to those skilled in the art.

[0030] As Figure 1 shown, the present application provides a horizontal well plugging removal and coalbed methane production device, comprising a spraying system, a pumping system, a propulsion system, a monitoring system, and a safety system module.

[0031] Specifically, the spraying system comprises a mounting rod 5, a mounting port 6, a high-pressure nozzle 7, and a reservoir fracture 8. The mounting rod 5 is provided with a plurality of mounting ports 6 transversely, and the high-pressure nozzle 7 is installed one-to-one at the mounting port 6. The plugging removal liquid is sprayed into the reservoir fracture 8 through the high-pressure nozzle 7.

[0032] The pumping system comprises a liquid injection port 1, a suction pump 2, a liquid injection pipe 3, a flowback pipe 4, and a shunt pipe 9. The lower part of the liquid injection port 1 is connected with the liquid injection pipe 3, through which the sand-suspending plugging removal liquid is input into the downhole. Specifically, the lower part of the liquid injection port 1 is provided with a valve 13, and the lower part of the valve 13 is provided with an automatic metering device 14. The automatic metering device 14 can be used to monitor and adjust the delivery rate of the plugging removal liquid in real time. A corner anti-blocking component 10 is arranged at the corner of the vertical pipe and the horizontal pipe of the liquid injection pipe 3, which can effectively prevent the reagent from blocking at the corner. The tail of the liquid injection pipe 3 is provided with the shunt pipe 9, and the plugging removal liquid is shunted in two directions at the shunt pipe 9.

[0033] The horizontal section of the flowback pipe 4 is provided with a laser device 20 outside. The flowback pipe 4 is connected with the suction pump 2, which is arranged at the tail of the flowback pipe 4 and can provide a stable and continuous power source for the process of discharging liquid. The other end of the suction pump 2 is connected with a waste liquid treatment tank 12. Both the suction pump 2 and the waste liquid treatment tank 12 are located above the horizontal ground. The waste liquid treatment tank 12 is provided with two layers of adsorption layers. The excess plugging removal liquid is extracted through the flowback pipe 4, and the harmful gas such as gas carried out is absorbed by the first adsorption layer, and the acidic liquid in the plugging removal liquid is neutralized by the second adsorption layer.

[0034] The propulsion system comprises a connecting motor hose 19, a motor 21, and a PDC ring bit device 22. The PDC ring bit device 22 is connected with the motor 21 through the connecting motor hose 19. The center of the connecting motor hose 19, the motor 21, and the PDC ring bit device 22 is located on the same horizontal line. The PDC ring bit device 22 is provided with a temperature sensor 23 and a humidity sensor 24 on both sides, respectively. The PDC ring bit device 22 can circularly distribute multiple drill bits according to the actual situation.

[0035] The return pipe 4 and the installation rod 5 are provided with a plurality of connection channels, and a pressure gauge 11 is arranged at the connection channels. When the pressure gauge 11 reaches a certain value, it is represented that the sand suspension plugging solution plugging is completed. At this time, under the action of the suction pump 2, the waste liquid in the liquid injection pipe is pumped out through the return pipe 4 and enters the waste liquid treatment tank 12.

[0036] The monitoring system comprises 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 comprises a safety valve 17 and an alarm device 18. When the environmental conditions exceed the normal range, the safety valve 17 is started to stop the plugging work. If the plugging work is abnormal, the alarm device 18 is started to stop the work for maintenance.

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

[0039] S001: Under the action of the propulsion system, the horizontal well passage is opened by the PDC annular drill bit device 22, and the jetting system is stretched into the horizontal well;

[0040] S002: The sand suspension plugging solution is injected through the liquid injection port 1 and transported to the horizontal well pipe through the liquid injection pipe 3;

[0041] S003: The plugging solution realizes two-way distribution at the distribution pipe 9 and enters a plurality of installation ports 6 on the installation rod 5;

[0042] S004: After the plugging solution is pressurized by the high-pressure jet head 7, it is sprayed into the reservoir fracture 8 for acidizing plugging;

[0043] S005: Through multiple circulation operations, the plugging and production increasing efficiency is improved;

[0044] S006: After the plugging is completed, the excess plugging solution is pumped into the waste liquid treatment tank 12 through the return pipe 4 under the action of the suction pump.

[0045] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical scheme of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

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 the mounting ports (6) are horizontally arranged on the mounting rod (5), and the 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); the pumping system comprises an injection port (1), a suction pump (2), an injection pipe (3), a return pipe (4), and a diversion pipe (9); the lower part of the injection port (1) is connected to the injection pipe (3), and the suspended sand deblocking 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), and the deblocking 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 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 tail of the injection pipe (3) is provided with the diversion pipe (9). The blocking liquid is diverted in two directions at the diversion pipe (9). The horizontal part of the return pipe (4) is divided into multiple sections. Each section is provided with a pressure gauge (11). The pressure of the liquid flowing in each section of the pipeline can be monitored 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 box (12). The suction pump (2) and the waste liquid treatment box (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 provided 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 exceed 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.

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 provided on the outside of 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 deblocking liquid is drawn out through the return pipe (4), the first adsorption layer absorbs the harmful gas carried out, and the second adsorption layer neutralizes the acidic liquid in the deblocking 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 coalbed methane production 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 fluid is injected through the injection port (1) and transported to the horizontal well pipeline through the 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 removal fluid is pressurized by the high-pressure nozzle (7), it is sprayed into the reservoir fracture (8) to perform acid 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 box (12) through the return pipe (4) under the action of the suction pump.

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