Geothermal zone pressure extraction and irrigation dual-purpose wellhead device

Abstract

The utility model discloses a geothermal zone pressure extraction and recharge dual-purpose wellhead device, which relates to the technical field of geothermal exploration equipment and comprises an acquisition pipeline, a recharge pipeline, a test pipeline and an emptying pipeline. A connecting pipe is arranged at the wellhead, and the lower end of the connecting pipe is connected with a top screw thread of a well wall pipe at the wellhead; a pump pipe is arranged in the connecting pipe, and the top of the pump pipe is communicated with a first connector of the tee joint; the collection pipeline and the recharge pipeline are respectively communicated with a second interface and a third interface of the tee joint; the test pipeline penetrates through the top of the connecting pipe and extends into the well; and one end of the emptying pipeline is communicated with the side wall of the connecting pipe. The geothermal belt pressure mining and filling dual-purpose wellhead device is reasonable in structure, good in sealing performance, stable in device operation and low in manufacturing cost, and achieves the purposes that mining and filling modes are convenient to switch, and dynamic parameters are accurately metered.

Description

Technical Field

[0001] The utility model relates to the technical field of geothermal exploration equipment, in particular to a wellhead device for geothermal pressure extraction and injection. Background Art

[0002] Geothermal drilling is a drilling and well construction project for the exploration and development of geothermal energy stored in the earth's crust. Hydrothermal geothermal requires the direct extraction of geothermal water through a submersible pump, and the low-temperature tail water is then re-injected into the formation through surface heat exchange. The entire system is closed and re-injected in the same layer, and heat extraction does not consume water, with high economic and environmental effects.

[0003] The patent with publication number CN206091920U discloses a dual-purpose wellhead device for geothermal well pumping and injection, including a pumping device and a reinjection device. The pumping end of the pumping device is connected to the submersible pump pipe arranged under the geothermal well through a 5-inch standard flange. A flange protective sleeve is installed on the periphery of the connection between the pumping end and the submersible pump pipe, and the return end of the reinjection device is connected to the flange protective sleeve. In addition, a flange butterfly valve, a thermometer, a pressure gauge, an ultrasonic heat meter, a swing check valve and a flange ball valve are respectively provided on the conveying pipeline along the pumping direction of the pumping device, and a flange ball valve, a thermometer, a pressure gauge, an ultrasonic heat meter and a flange butterfly valve are respectively provided on the conveying pipeline along the return direction of the reinjection device.

[0004] However, the existing geothermal well production and injection mode switching has problems such as low wellhead device integration, high processing difficulty, and inconvenient installation. Therefore, there is an urgent need for a geothermal pressure production and injection dual-purpose wellhead device. Summary of the invention

[0005] The purpose of the utility model is to provide a geothermal pressure production and injection dual-purpose wellhead device to solve the problems existing in the above-mentioned prior art. The device has a reasonable structure, good sealing performance, and stable operation, and achieves the purpose of convenient switching between production and injection modes and accurate measurement of dynamic parameters.

[0006] To achieve the above purpose, the utility model provides the following solutions:

[0007] The utility model provides a geothermal pressure collection and injection dual-purpose wellhead device, comprising a collection pipeline, a reinjection pipeline, a test pipeline and an emptying pipeline; a connecting pipe is arranged at the wellhead, the lower end of the connecting pipe is connected with the top thread of the well wall pipe at the wellhead; a pump pipe is arranged in the connecting pipe, the top of the pump pipe is connected with the first interface of the tee; the collection pipeline and the reinjection pipeline are respectively connected with the second interface and the third interface of the tee; the test pipeline penetrates the top of the connecting pipe and extends into the well; one end of the emptying pipeline is connected with the side wall of the connecting pipe.

[0008] Optionally, the collection pipeline includes a check valve and a first gate valve which are sequentially arranged starting from the second interface of the tee.

[0009] Optionally, the collection pipeline is also provided with a flow meter, a sampling port, an insertion thermometer, an electronic thermometer, a mechanical pressure gauge and an electronic pressure gauge.

[0010] Optionally, the reinjection pipeline includes a first gate valve and a check valve which are arranged in sequence starting from the third interface of the tee.

[0011] Optionally, the reinjection pipeline is also provided with a flow meter, an insertion thermometer, a sampling port, an electronic thermometer, a mechanical pressure gauge and an electronic pressure gauge.

[0012] Optionally, the test pipeline includes a measuring tube and a ball valve; the measuring tube passes through the flange at the top of the connecting tube and extends into the well, a water level measuring port is provided at the top of the measuring tube, and a ball valve is provided above the flange at the top of the connecting tube.

[0013] Optionally, a second gate valve is provided on the exhaust pipeline.

[0014] Optionally, a cement ring is provided on the annular gap between the wellbore pipe of the wellhead and the formation, and a cement platform is provided on the ground of the wellhead in an integrated manner with the cement ring.

[0015] Optionally, a water level measuring sensor is provided on the flange at the top of the connecting pipe, and the water level measuring sensor includes a sensor cable and a water level sensor probe, and the lower end of the sensor cable passes through the flange at the top of the connecting pipe and is connected to the water level sensor probe.

[0016] Optionally, the connecting pipe is connected to the well wall pipe by threads.

[0017] Compared with the prior art, the utility model has achieved the following technical effects:

[0018] The utility model discloses a dual-purpose wellhead device for geothermal pressure extraction and injection, which has reasonable structure, good sealing performance, stable operation and low cost, and achieves the purpose of convenient switching between extraction and injection modes and accurate measurement of dynamic parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1It is a structural schematic diagram of a geothermal pressure extraction and injection dual-purpose wellhead device in the utility model.

[0021] Description of reference numerals:

[0022] 1. Reinforcement ribs; 2. Flange clamp high temperature pad; 3. Tee; 4. Water level measuring port; 5. Ball valve; 6. Measuring tube; 7. Check valve; 8. First gate valve; 9. Flow meter; 10. Sampling port; 11. Insert thermometer; 12. Electronic thermometer; 13. Mechanical pressure gauge; 14. Electronic pressure gauge; 15. Second gate valve; 16. Sensor cable; 17. Connecting pipe; 18. Male thread; 19. Female thread; 20. Well wall pipe; 21. Cement platform; 22. Cement ring; 23. Pump pipe; 24. Water level sensor probe; 25. Lifting ring; 26. Closed cable hole; 27. Support rod. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] like Figure 1 As shown, this embodiment provides a geothermal pressure collection and injection dual-purpose wellhead device, including a collection pipeline, a reinjection pipeline, a test pipeline and an emptying pipeline; a connecting pipe 17 is provided at the wellhead, and the lower end of the connecting pipe 17 is connected to the top of the well wall pipe 20 at the wellhead; a pump pipe 23 is provided in the connecting pipe 17, and the top of the pump pipe 23 is connected to the first interface of the tee 3; the collection pipeline and the reinjection pipeline are respectively connected to the second interface and the third interface of the tee 3; the test pipeline passes through the top of the connecting pipe 17 and extends into the well; one end of the emptying pipeline is connected to the side wall of the connecting pipe 17.

[0026] In this specific embodiment, the top flange of the connecting pipe 17 is provided with an intermediate pipe, which passes through the top flange and is welded to the top flange. A reinforcing rib 1 is provided at the welding point to enhance the connection strength between the intermediate pipe and the top flange. The upper end of the intermediate pipe is connected to the tee 3 through a flange, and the lower end of the intermediate pipe is connected to the pump pipe 23 through a flange.

[0027] In a more specific embodiment, the connecting pipe 17 includes a threaded pipe and a flange tee pipe. The bottom of the flange pipe is provided with a male thread 18 for connecting to the female thread 19 at the top of the well wall pipe 20. After the threaded pipe is connected to the well wall pipe 20, the top of the threaded pipe is connected to the bottom interface of the flange tee pipe through a flange, the top flange is arranged at the top interface of the flange tee pipe, and the drain pipeline is connected to the side wall interface of the flange tee pipe through a flange.

[0028] Flange clamp high temperature pads 2 are respectively arranged between the threaded pipe and the flange tee pipe, between the flange tee pipe and the top flange, and between the tee 3 and the collection pipeline.

[0029] The collection pipeline includes a check valve 7 and a first gate valve 8, which are sequentially arranged from the second interface of the tee 3, as well as a flow meter 9, a sampling port 10, an insertion thermometer 11, an electronic thermometer 12, a mechanical pressure gauge 13 and an electronic pressure gauge 14. The recharging pipeline includes a first gate valve 8 and a check valve 7, which are sequentially arranged from the third interface of the tee 3, as well as a flow meter 9, an insertion thermometer 11, a sampling port 10, an electronic thermometer 12, a mechanical pressure gauge 13 and an electronic pressure gauge 14. The sampling port 10 is provided with a valve.

[0030] By controlling the opening and closing of the first gate valve 8 on the collection pipeline and the reinjection pipeline, the on-off control of the collection pipeline and the reinjection pipeline is realized, thereby realizing the collection and reinjection operations.

[0031] The test pipeline includes a measuring pipe 6 and a ball valve 5; the measuring pipe 6 penetrates the flange at the top of the connecting pipe 17 and extends into the well, a water level measuring port 4 is provided at the top of the measuring pipe 6, and a ball valve 5 is provided above the flange of the measuring pipe 6 located at the top of the connecting pipe 17. The test pipeline is used to measure the water level in the well by means of a measuring rope. By opening the ball valve 5, the measuring rope is placed into the measuring pipe 6 for measurement, and after the measurement is completed, the measuring rope is recovered and the ball valve 5 is closed.

[0032] The drain pipeline is provided with a second gate valve 15. By opening the second gate valve 15, the well is deflated, drained and filled with nitrogen.

[0033] A cement ring 22 is arranged on the annular gap between the wellbore pipe and the stratum at the wellhead, and a cement platform 21 is arranged integrally with the cement ring 22 on the ground surface at the wellhead.

[0034] A water level measuring sensor is arranged on the flange at the top of the connecting pipe 17 , and the water level measuring sensor comprises a sensor cable 16 and a water level sensor probe 24 . The lower end of the sensor cable 16 passes through the flange at the top of the connecting pipe 17 and is connected to the water level sensor probe 24 .

[0035] A lifting ring 25 is provided on the flange at the top of the connecting pipe 17 , and the lifting ring 25 is used to connect a lifting device to facilitate the transportation of the connecting pipe 17 .

[0036] A closed cable hole 26 is provided on the flange at the top of the connecting pipe 17 , a ball valve 5 is provided at the end of the closed cable hole 26 , and the closed cable hole 26 is used for passing the sensor cable 16 .

[0037] In order to enhance the structural strength of the wellhead device after installation, support rods 27 are provided between the collection pipeline and the reinjection pipeline and between the reinjection pipeline and the ground.

[0038] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0039] This specification uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, according to the idea of ​​the utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the utility model.

Claims

1. A geothermal pressure extraction and filling dual-purpose wellhead device, characterized in that: It comprises a collection pipeline, a reinjection pipeline, a test pipeline and an emptying pipeline; a connecting pipe is arranged at the wellhead, the lower end of which is connected with the top thread of the well wall pipe at the wellhead; a pump pipe is arranged in the connecting pipe, the top of which is connected with the first interface of the tee; the collection pipeline and the reinjection pipeline are respectively connected with the second interface and the third interface of the tee; the test pipeline passes through the top of the connecting pipe and extends into the well; one end of the emptying pipeline is connected with the side wall of the connecting pipe.

2. The geothermal pressure extraction and irrigation dual-purpose wellhead device according to claim 1 is characterized in that: The collection pipeline includes a check valve and a first gate valve which are sequentially arranged starting from the second interface of the tee.

3. The geothermal pressure extraction and irrigation dual-purpose wellhead device according to claim 2 is characterized in that: The collection pipeline is also provided with a flow meter, a sampling port, an insertion thermometer, an electronic thermometer, a mechanical pressure gauge and an electronic pressure gauge.

4. The geothermal pressure extraction and irrigation dual-purpose wellhead device according to claim 1 is characterized in that: The reinjection pipeline includes a first gate valve and a check valve which are sequentially arranged starting from the third interface of the three-way connection.

5. The geothermal pressure extraction and irrigation dual-purpose wellhead device according to claim 4 is characterized in that: The reinjection pipeline is also provided with a flow meter, an insertion thermometer, a sampling port, an electronic thermometer, a mechanical pressure gauge and an electronic pressure gauge.

6. The geothermal pressure extraction and irrigation dual-purpose wellhead device according to claim 1 is characterized in that: The test pipeline includes a test pipe and a ball valve; the test pipe passes through the flange at the top of the connecting pipe and extends into the well, a water level measuring port is arranged on the top of the test pipe, and a ball valve is arranged above the flange at the top of the connecting pipe.

7. The geothermal pressure extraction and irrigation dual-purpose wellhead device according to claim 1 is characterized in that: A second gate valve is arranged on the exhaust pipeline.

8. The geothermal pressure extraction and irrigation dual-purpose wellhead device according to claim 1 is characterized in that: A cement ring is arranged on the annular gap between the well wall pipe of the wellhead and the stratum, and a cement platform is arranged on the ground of the wellhead in one piece with the cement ring.

9. The geothermal pressure extraction and irrigation dual-purpose wellhead device according to claim 1 is characterized in that: A water level measuring sensor is arranged on the flange at the top of the connecting pipe. The water level measuring sensor comprises a sensor cable and a water level sensor probe. The lower end of the sensor cable passes through the flange at the top of the connecting pipe and is connected to the water level sensor probe.

10. The geothermal pressure extraction and irrigation dual-purpose wellhead device according to claim 1, characterized in that: The connecting pipe is connected to the well wall pipe through threads.

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