Energy-saving thermal insulation system for deep coal bed gas ground drainage and mining equipment

Abstract

The utility model discloses an energy-saving thermal insulation system for deep coal bed gas ground drainage equipment, which comprises a tee joint, a water return pipeline of a jet pump is connected into a water tank, an overflow pipe is arranged on the water tank, the tail end of the overflow pipe is connected with one end of the tee joint, the other two ends of the tee joint are respectively connected with a first ball valve and a second ball valve, and the second ball valve is connected with an aluminum plastic pipe. The other end of the plastic-aluminum pipe is attached to a wellhead ground gas production pipeline and a ground gas transmission pipeline in parallel, and the tail end of the plastic-aluminum pipe and the first ball valve are connected into a small well site pool. According to the energy-saving heat preservation and control device, the characteristic that the temperature of a block reservoir is high is utilized, flow-back fluid is reasonably utilized to conduct intelligent heat preservation on ground drainage and mining equipment, energy consumption generated by long-term work of a heat tracing band in winter can be saved, and the equipment can operate stably.

Description

Technical Field

[0001] This utility model belongs to the technical field of energy-saving and heat preservation of coalbed methane surface drainage equipment, specifically relating to an energy-saving and heat preservation system for deep coalbed methane surface drainage equipment. Background Technology

[0002] The main production wells in the deep coalbed methane exploration and development of the Wuxiang South Block are L-shaped horizontal wells, which are primarily operated using jet pumps. The coal seams in this block are deep, with high reservoir temperatures. The average well temperature at No. 3 coal seam is 45℃, and the average temperature of the flowback fluid reaches 25℃. At No. 15 coal seam, the average well temperature is 52℃, and the average temperature of the flowback fluid reaches 30℃. Due to the cold winter weather, with minimum temperatures reaching -20℃, it is necessary to wrap the wellheads and surface pipelines with heat tracing tape and insulation cotton to prevent equipment freezing, icing inside the gas pipelines, and other abnormal conditions, ensuring the normal operation of the equipment.

[0003] When a jet pump is operating normally and stably, its surface water system (inlet pipe, high-pressure pipe, return pipe), wellhead, and water tank rely on their own relatively high-temperature circulating inlet and outlet fluids to maintain stable operation. To prevent the water in the pipes and water tank from freezing in abnormal states such as no fluid output or machine shutdown due to malfunction, the entire pipeline and water tank are usually equipped with heat tracing tape, insulation cotton, and aluminum foil tape. The heat tracing tape operates 24 hours a day, therefore, this energy consumption during normal operation represents a significant loss. The jet pump surface equipment requires insulation for many facilities. Including the gas pipeline, each well needs approximately 200 meters of heat tracing tape. Each meter of heat tracing tape has a power of 60W, and the daily electricity consumption for running the heat tracing tape is approximately 288 kWh. At 0.5 yuan per kWh, the daily electricity cost for insulation per well is 144 yuan. Running the heat tracing tape for 5 months a year, the electricity cost per well is approximately 17,280 yuan, which is a considerable expense for pumping and extraction operations. Optimizing ground equipment insulation facilities, saving energy, and reducing operating costs are urgent problems that the block needs to consider and solve. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides an energy-saving insulation system for deep coalbed methane surface drainage equipment.

[0005] This utility model adopts the following technical solution: an energy-saving insulation system for deep coalbed methane surface drainage equipment, including a tee, a return water pipeline of a jet pump connected to a water tank, an overflow pipe installed on the water tank, the end of the overflow pipe connected to one end of the tee, the other two ends of the tee connected to a first ball valve and a second ball valve respectively, the second ball valve connected to an aluminum-plastic pipe, the other end of the aluminum-plastic pipe being attached parallel to the wellhead surface gas extraction pipeline and the surface gas transmission pipeline, and the end of the aluminum-plastic pipe and the first ball valve connected to a small water tank at the well site.

[0006] Preferably, the device includes a relay, and an aluminum-plastic pipe near the second ball valve is equipped with a normally closed water flow sensor. The normally closed water flow sensor is electrically connected to the control circuit of the relay. The ground drainage equipment is equipped with a heat tracing cable, which is electrically connected to the working circuit of the circuit breaker and the relay.

[0007] Preferably, the control circuit of the relay is powered by a 220V to 24V power supply.

[0008] Preferably, the aluminum-plastic pipe is attached parallel to the wellhead surface gas production pipeline and the surface gas transmission pipeline, and folded back 3-4 times.

[0009] Preferably, the aluminum-plastic pipe is a 4-point pipe.

[0010] Preferably, the heat tracing tape and aluminum-plastic pipe are wrapped with thermal insulation cotton and then wrapped with aluminum foil tape.

[0011] Compared with the prior art, the present invention provides an energy-saving insulation system for deep coalbed methane surface drainage equipment, which has the following beneficial effects:

[0012] 1. The energy-saving and heat-preserving device of this utility model utilizes the high temperature of the reservoir in the block to make reasonable use of the backflow fluid to intelligently heat the surface drainage equipment, which can save the energy consumption generated by the long-term operation of the heating cable in winter and make the equipment operate stably.

[0013] 2. By installing aluminum-plastic pipes, the high-temperature return liquid can be used. By adjusting the ball valve, the return liquid can be used to insulate the ground gas pipeline in winter through the aluminum-plastic pipes, thereby reducing energy consumption and operating costs.

[0014] 3. By combining normally closed water flow sensors and relays, the heating cable will not work under normal operation without power. Under abnormal operation, when the water flow sensor detects no water, it will change from the normally open state back to the normally closed state. The relay will then be energized and closed, allowing the heating cable to run. The heating cable generates heat to prevent the ground equipment from freezing and ensure the normal operation of the equipment, thereby achieving the function of heat preservation for the ground equipment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the control circuit of the relay of this utility model.

[0017] Figure 3 This is a schematic diagram of the working circuit of the relay of this utility model.

[0018] In the diagram: 1-First ball valve; 2-T-way valve; 3-Second ball valve; 4-Normally closed water flow sensor; 5-Aluminum-plastic pipe; 6-Ground gas pipeline; 7-Inlet and outlet valves; 8-Pump head and inlet pipeline; 9-Return water pipeline; 10-Water tank; 11-Overflow pipe; 12-Treem; 13-24V power supply; 14-Relay; 15-Heat tracing cable; 16-Circuit breaker; 17-220V power supply. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] like Figures 1-3 As shown, an energy-saving insulation system for deep coalbed methane surface drainage equipment includes a first ball valve 1, a tee 2, a second ball valve 3, a normally closed water flow sensor 4, an aluminum-plastic pipe 5, and a relay 14. The return water pipeline of the jet pump is connected to a water tank 10. An overflow pipe 11 is installed on the water tank 10. A tee 2 is installed at the end of the overflow pipe 11. The other two ends of the tee 2 are connected to the first ball valve 1 and the second ball valve 3, respectively. The second ball valve 3 is connected to the aluminum-plastic pipe 5. The other end of the aluminum-plastic pipe 5 is attached parallel to the wellhead surface gas extraction pipeline and the surface gas transmission pipeline 6. The end of the aluminum-plastic pipe 5 is connected to a small water tank at the well site. The aluminum-plastic pipe 5 near the second ball valve 3 is equipped with a normally closed water flow sensor 4. The normally closed water flow sensor 4 and the control interface of the relay 14 are connected in series through a 24V power supply 13. The original heat tracing cable 15 wrapped around the pump head and the inlet pipe 8, the return pipe 9, the water tank 10, the overflow pipe 11, the oil well tree 12, and the gas transmission pipe 6 are connected in series with a 220V power supply 17 through the working interface of the circuit breaker 16 and the relay 14.

[0021] The pump head and inlet pipe 8 are connected to the return pipe 9 through the inlet and outlet valves 7. The control circuit of the relay 14 is powered by a 220V to 24V power supply and uses a safe 24V voltage. There is no voltage during normal operation, which ensures safe use.

[0022] The aluminum-plastic pipe 5 is a 4-point pipe, i.e., an outer diameter of 16mm, an inner diameter of 12mm, and an inner surface area of ​​0.11304*10-3m2. It features high and low temperature resistance, pressure resistance, flexibility, and a long service life, making it suitable as a material for surface gas pipeline insulation. The aluminum-plastic pipe 5 is attached parallel to the wellhead surface gas extraction pipeline and the surface gas transmission pipeline 6, folded back 3-4 times to increase the insulation effect of overflow water on the pipeline. Insulation cotton is wrapped around the heat tracing tape 15 and the aluminum-plastic pipe 5 and then wrapped with aluminum foil tape.

[0023] When the equipment is operating normally, the first ball valve 1 is closed and the second ball valve 3 is opened. The backflow liquid from the water tank 10 enters the aluminum-plastic pipe 5 through the overflow pipe 11 and the tee 2. As the backflow liquid continuously enters the aluminum-plastic pipe 5, the water flow sensor 4 changes from a normally closed state to a normally open state. At this time, the control circuit of the relay 14 cannot receive power and is in a non-engaged state. The working circuit is in a disconnected state, and the heating cable 15 does not work. The backflow liquid heats the aluminum-plastic pipe 5 by its own high temperature, which can supply heat to the surface gas pipeline 6 to ensure normal gas output. Finally, the backflow liquid in the aluminum-plastic pipe 5 flows into the small water pool at the well site.

[0024] When the equipment malfunctions and its return fluid cannot return to the ground normally, no more return fluid will enter the aluminum-plastic pipe 5. The normally closed water flow sensor 4 will detect the lack of return fluid flow and will change from the normally open state back to the normally closed state. The control circuit of the relay 14 will then be energized and closed, energizing the original heat tracing cable 15. This will achieve the insulation function of the entire ground equipment, including the return water pipe 9, water tank 10, overflow pipe 11, oil well tree 12, and ground gas pipeline 6, ensuring that the ground equipment and facilities are not frozen.

[0025] During maintenance, repair, or when the insulation control device is not in use, the aluminum-plastic pipe 5 can open the first ball valve 1 and close the second ball valve 3, allowing the backflow fluid to flow from the first ball valve 1 into the well site small water pool, ensuring normal operation of drainage.

[0026] It should be noted that the daily fluid return volume of horizontal wells in the northern part of the Wuxiang South Block exceeded 3m³ during the later stages of production. 3 / d, the test and analysis of this water flow control device shows that the minimum water volume required for heat preservation through water flow control is not less than 2 m³. 3 / d, therefore, this device is suitable for the operating wells in this block. Wells in other blocks should be selected and applied reasonably based on well temperature, flowback fluid volume and local air temperature conditions to ensure the stable operation of the drainage equipment and insulation device.

[0027] All standard parts used in this utility model can be purchased from the market. Irregular parts can be modified and customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, which will not be described in detail here.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An energy-saving heat preservation system for deep coalbed methane surface drainage equipment, characterized in that: The system includes a three-way valve (2), a return water pipeline (9) of the jet pump connected to a water tank (10), an overflow pipe (11) on the water tank (10), the end of the overflow pipe (11) connected to one end of the three-way valve (2), the other two ends of the three-way valve (2) connected to the first ball valve (1) and the second ball valve (3) respectively, the second ball valve (3) connected to the aluminum-plastic pipe (5), the other end of the aluminum-plastic pipe (5) attached parallel to the wellhead surface gas production pipeline and the surface gas transmission pipeline (6), and the end of the aluminum-plastic pipe (5) and the first ball valve (1) connected to the well site small water tank.

2. The energy-saving insulation system for the deep coalbed methane surface drainage equipment according to claim 1, characterized in that: Includes a relay (14), an aluminum-plastic pipe (5) near the second ball valve (3) is equipped with a normally closed water flow sensor (4), the normally closed water flow sensor (4) is electrically connected to the control circuit of the relay (14), the ground drainage equipment is equipped with a heat tracing cable (15), the heat tracing cable (15) is electrically connected to the working circuit of the circuit breaker (16) and the relay (14).

3. The energy-saving insulation system for the deep coalbed methane surface drainage equipment according to claim 2, characterized in that: The control circuit of the relay (14) is powered by a 220V to 24V power supply.

4. The energy-saving insulation system for the deep coalbed methane surface drainage equipment according to claim 1, characterized in that: Aluminum-plastic pipe (5) is attached parallel to the wellhead surface gas production pipeline and surface gas transmission pipeline (6) and folded back 3-4 times.

5. The energy-saving insulation system for the deep coalbed methane surface drainage equipment according to claim 4, characterized in that: Aluminum-plastic pipe (5) uses 4-point pipe.

6. The energy-saving insulation system for the deep coalbed methane surface drainage equipment according to any one of claims 1-5, characterized in that: The heat tracing material (15) and aluminum-plastic pipe (5) are wrapped with thermal insulation cotton and then wrapped with aluminum foil tape.

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