Wellhead anti-freezing device of water injection well

Abstract

The utility model discloses an anti-freezing device for a wellhead of a water injection well, which comprises an igniter arranged in a preset area of the wellhead of the water injection well, connected with an external power supply and used for heating water by burning associated gas. The heat tracing assembly is arranged on the pipe wall of the wellhead of the water injection well, connected with the igniter through a pipeline and semi-wraps the pipe walls of a sleeve and an oil pipe of the wellhead of the water injection well, the igniter is used for supplying hot water to the heat tracing assembly after the natural gas is introduced, and the heat tracing assembly is used for heating the sleeve and the oil pipe. And the heat preservation assembly is arranged on the heat tracing assembly, wraps the heat tracing assembly, the sleeve and the oil pipe and is used for transferring heat of the heat tracing assembly to the sleeve and the oil pipe. The heat preservation assembly and the heat tracing assembly can be repeatedly used, materials are saved, the overhaul time and workload are reduced, hot water is provided for the heat tracing assembly through the igniter, the hot water continues to enter the igniter to be combusted again after being cooled, continuous supply of the hot water is ensured, and the situation of heat tracing disconnection is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of water injection well antifreeze, in particular to a water injection well mouth antifreeze device. Background Art

[0002] During the development of oil fields, water is injected into the reservoir through special water injection wells to maintain or restore the oil layer pressure, so that the reservoir has a strong driving force to increase the production speed and recovery rate of the reservoir. Yanchang Oilfield is located in the Ordos Basin. In winter, the temperature difference between day and night is large, the lowest temperature is low, and it is often accompanied by strong winds. When the water injection wells set up in the field are in the harsh winter environment and are in production for a long time, the performance of the pipeline is easily changed due to the large temperature difference between the inside and outside of the pipeline, which poses a production risk. Therefore, the wellhead device of the water injection well needs to be antifreeze treated in winter.

[0003] In the prior art, antifreeze measures are mainly divided into three forms: insulation cotton, electric heating and the combination of insulation cotton and electric heating. Insulation cotton is used to insulate the water injection wellhead. Each well repair operation or measures operation must destroy the insulation cotton. After the operation is completed, the wellhead is re-insulated, resulting in a waste of insulation materials; electric heating is to pass electricity through the electric heating tape and wrap the heating tape on the pipe wall, valve or gate to heat the internal medium, but in an extremely cold environment, the power supply is easily damaged and the heating tape is powered off, and the heating tape wrapped around the pipe wall needs to be removed in reverse during maintenance, which increases the maintenance time and workload; although the combination of insulation cotton and electric heating can preserve the heat of the electric heating through the insulation cotton, it is still necessary to remove the insulation cotton and the heating tape when encountering maintenance operations, which also increases the maintenance workload and maintenance time.

[0004] Therefore, the existing antifreeze and heat preservation measures have the problem of wasting materials and increasing workload before and after maintenance work. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a water injection well head antifreeze device, which provides continuous heating to the water injection well head through a heating component, a heat preservation component and an igniter.

[0006] In order to achieve the above object, the utility model is implemented through the following technical solutions:

[0007] A water injection well head antifreeze device, comprising:

[0008] The igniter is arranged in a preset area at the wellhead of the water injection well and is connected to an external power source for heating water by burning associated gas.

[0009] The heating component is arranged on the pipe wall of the wellhead of the water injection well, is connected to the igniter through a pipeline, and is semi-covered on the casing and the pipe wall of the oil pipe at the wellhead of the water injection well. The igniter is used to provide hot water to the heating component after the gas is introduced. The heating component is used to heat the casing and the oil pipe.

[0010] The heat preservation component is arranged on the heating component, covers the heating component, the casing and the oil pipe, and is used for transferring the heat of the heating component to the casing and the oil pipe.

[0011] Compared with the prior art, the utility model has the following advantages:

[0012] Before maintenance, the heating assembly can be exposed by separating the heat preservation assembly, and can be directly repaired by half-wrapping the heating assembly on the wall of the casing and oil pipe. The heating assembly can also be removed from the pipe wall at any time according to work needs, and the disassembly is extremely convenient. It only needs to be directly removed from the pipe wall. After the maintenance, the heating assembly is directly half-wrapped on the pipe wall, and then the heat preservation assembly is buckled together. Not only can the heat preservation assembly and the heating assembly be reused, saving materials and reducing maintenance time and workload, but also hot water is provided to the heating assembly through the igniter. After the hot water is cooled, it continues to enter the igniter to burn again, ensuring the continuous supply of hot water and avoiding the situation of heating disconnection.

[0013] More preferably, the heating assembly comprises:

[0014] The water inlet pipe is arranged at the water inlet of the igniter, the water inlet is connected to the water injection pipeline of the water injection well, and its outlet is fixedly connected to the igniter.

[0015] The water outlet pipe is arranged on the igniter, and its inlet is fixedly connected with the igniter, and is used for outputting the hot water heated after the ignition of the igniter.

[0016] The winding pipe is respectively arranged on the oil pipe and the casing, and is covered on the pipe wall of the oil pipe and the casing. Its inlet is connected with the outlet of the water outlet pipe, and is used for heating the pipe wall of the oil pipe and the casing through the hot water inside it.

[0017] The return water pipe is arranged at the inlet of the igniter, connected to the end outlet of the winding pipe and the water inlet pipe, and is used for collecting water in the water inlet pipe and the return water pipe for recycling and heating.

[0018] By adopting the above technical solution, the water inlet pipe provides the water that needs to be heated directly to the igniter, and the return pipe recycles the cooled hot water into the igniter, continues to recycle and heat it, and heats the oil pipe and casing in the incorporated winding pipe, so that heating and recycling can be carried out simultaneously, saving water and continuously providing heat to the oil pipe and casing.

[0019] Further preferably, the heating assembly further comprises:

[0020] The transition pipe is arranged on the winding pipe and is located on one side of the valve on the oil pipe, and is used to guide the transition pipe from one side of the valve to the other side.

[0021] The branch pipe is arranged on the winding pipe and located on the casing four-way of the water injection well. The ends of the branch pipe are respectively connected with the winding pipe and the transition pipe, and are used for diverting hot water at the casing four-way.

[0022] By adopting the above technical solution, through the combination of the transition pipe and the winding pipe, the winding pipe can cross the gate and continue to heat the oil pipe or casing, thereby ensuring the continuity and integrity of the heating.

[0023] More preferably, the winding tube is in a "bow" shape.

[0024] Further optimization is that the winding tube is in a curved semicircular shape.

[0025] By adopting the above technical solution, the winding tube which is a combination of the "bow" shape and the semicircular shape has a unique structure, can be well wrapped on the tube wall, and has the characteristics of simple and firm structure, is not easy to be damaged, and has a long service life.

[0026] Further optimization is that the materials of the bypass pipe, transition pipe and branch pipe are all polyethylene.

[0027] The above technical solution has good low temperature resistance and flame retardant properties and can be used in the cold working environment of oil fields.

[0028] Further optimization is that the heat preservation component includes:

[0029] The heat preservation pipe is arranged on the outside of the winding pipe and is jacketed on the winding pipe.

[0030] The heat-conducting layer is arranged on the heat-retaining inner wall, contacts the winding pipe, and has a gap with the inner wall of the oil pipe and the inner wall of the casing, so as to transfer the heat of the winding pipe to the oil pipe and the casing.

[0031] By adopting the above technical solution, the part of the heat-conducting layer that contacts the winding pipe directly diffuses the heat into the heat-preserving pipe after being heated, and continues to be insulated between the heat-conducting layer and the pipe wall to maintain the heat in the heat-preserving pipe, so as to prevent the medium in the oil pipe or casing from freezing, thereby achieving the effect of antifreeze and heat preservation.

[0032] Further optimization is that the heat preservation pipe is a half pipe, and every two half pipes are plugged on the outer side of the winding pipe.

[0033] The above technical solution is adopted, which is convenient for disassembly and can be reused.

[0034] Further optimization is that the heat conducting layer is tin foil, and the tin foil is bonded to the heat preservation tube.

[0035] By adopting the above technical solution, the tin foil has excellent thermal conductivity and can quickly diffuse and conduct the heat around the tube to the tube wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the structure of this embodiment.

[0037] Figure 2 Schematic diagram of the structure of the heating assembly in this embodiment.

[0038] Figure 3 Schematic diagram of the structure of the winding tube in this embodiment.

[0039] Figure 4 Schematic diagram of the structure of the transition tube in this embodiment.

[0040] Figure 5 Schematic diagram of the structure of the heat preservation component in this embodiment.

[0041] Figure numerals: 1-casing; 2-oil pipe; 3-igniter; 4-heating assembly; 41-water inlet pipe; 42-water outlet pipe; 43-water return pipe; 44-bypass pipe; 45-transition pipe; 46-branch pipe; 5-heat preservation assembly; 51-heat preservation pipe; 52-heat conductive layer; 6-casing cross. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1-Figure 5 The utility model is further introduced in detail.

[0043] A water injection well head antifreeze device, such as Figure 1 As shown, including:

[0044] The igniter 3 is arranged in a preset area at the wellhead of the water injection well and is connected to an external power source for heating water by burning associated gas.

[0045] The heating component 4 is arranged on the pipe wall of the wellhead of the water injection well, is connected to the igniter 3 through a pipeline, and is semi-covered on the pipe wall of the casing 1 and the oil pipe 2 at the wellhead of the water injection well. The igniter 3 is used to provide hot water to the heating component 4 after the gas is introduced. The heating component 4 is used to heat the casing 1 and the oil pipe 2.

[0046] The heat preservation component 5 is arranged on the heating component 4 , and covers the heating component 4 , the casing 1 , and the oil pipe 2 , and is used for transferring the heat of the heating component 4 to the casing 1 and the oil pipe 2 .

[0047] Before maintenance, the heating component 4 can be exposed by separating the heat preservation component 5. The heating component 4 is half-wrapped on the pipe wall of the casing 1 and the oil pipe 2, so that maintenance can be carried out directly. The heating component 4 can also be removed from the pipe wall at any time according to work needs, and the disassembly is extremely convenient. It only needs to be directly removed from the pipe wall. After the maintenance is completed, the heating component 4 is directly half-wrapped on the pipe wall, and then the heat preservation component 5 is buckled together. Not only can the heat preservation component 5 and the heating component 4 be reused, saving materials and reducing maintenance time and workload, but also hot water is provided to the heating component 4 through the igniter 3. After the hot water is cooled, it continues to enter the igniter 3 to burn again, ensuring the continuous supply of hot water and avoiding the situation of heating disconnection.

[0048] Specifically, Figure 1 and Figure 2 As shown, the heat tracing assembly 4 in this embodiment includes:

[0049] The water inlet pipe 41 is arranged at the water inlet of the igniter 3, the water inlet is connected to the water injection pipeline of the water injection well, and the outlet is fixedly connected to the igniter 3.

[0050] The water outlet pipe 42 is arranged on the igniter 3 , and its inlet is fixedly connected to the igniter 3 , and is used to output the hot water heated after the ignition of the igniter 3 .

[0051] The winding pipe 44 is respectively arranged on the oil pipe 2 and the casing 1, and covers the pipe wall of the oil pipe 2 and the casing 1. Its inlet is connected to the outlet of the water outlet pipe 42, and is used for heating the pipe wall of the oil pipe 2 and the casing 1 through the hot water inside it.

[0052] The return water pipe 43 is arranged at the inlet of the igniter 3, connected to the terminal outlet of the winding pipe 44, and connected to the water inlet pipe 41, and is used to collect water in the water inlet pipe 41 and the return water pipe 43 for recycling and heating.

[0053] The water inlet pipe 41 provides water that needs to be heated directly to the igniter 3, and the return pipe 43 recovers the cooled hot water to the igniter 3, continues to recover and heat it, and heats the oil pipe 2 and the casing 1 in the winding pipe 44, so that heating and recovery are carried out simultaneously, saving water and continuously providing heat to the oil pipe 2 and the casing 1.

[0054] Specifically, Figure 1 , Figure 2 as well as Figure 3 As shown, the heat tracing component 4 in this embodiment also includes:

[0055] The transition pipe 45 is arranged on the bypass pipe 44 and is located on one side of the valve on the oil pipe 2, and is used to guide the transition pipe 45 from one side of the valve to the other side.

[0056] The branch pipe 46 is arranged on the bypass pipe 44 and located on the casing spool 1 of the water injection well. Its ends are respectively connected to the bypass pipe 44 and the transition pipe 45 for diverting hot water at the casing spool 1.

[0057] By combining the transition pipe 45 with the bypass pipe 44, the bypass pipe 44 can cross the gate and continue to heat the oil pipe 2 or the casing 1, thereby ensuring the continuity and integrity of the heating.

[0058] Specifically, Figure 2 , Figure 3 as well as Figure 4 As shown, the winding tube 44 in this embodiment is in a "bow" shape. The winding tube 44 is in a curved semicircular shape. The winding tube 44, which is a combination of the "bow" shape and the semicircular shape, has a unique structure, can be well coated on the pipe wall, and has the characteristics of simple and firm structure, is not easy to be damaged, and has a long service life.

[0059] Specifically, the winding pipe 44, the transition pipe 45 and the branch pipe 46 in this embodiment are all made of polyethylene, which has good low temperature resistance, flame retardancy and flexibility, and can be applied to the cold working environment in the oil field.

[0060] Specifically, Figure 1 and Figure 2 As shown, the heat preservation component 5 in this embodiment includes:

[0061] The heat preservation tube 51 is arranged on the outside of the winding tube 44 and is jacketed on the winding tube 44 .

[0062] The heat conducting layer 52 is arranged on the heat-retaining inner wall, contacts the coil 44 , and has a gap with the inner wall of the oil pipe 2 and the inner wall of the casing 1 , so as to transfer the heat of the coil 44 to the oil pipe 2 and the casing 1 .

[0063] After being heated, the portion of the heat-conducting layer 52 in contact with the winding tube 44 directly diffuses the heat into the heat-preserving tube 51, and continues to be insulated between the heat-conducting layer 52 and the tube wall, maintaining the heat in the heat-preserving tube 51 to prevent the medium in the oil pipe 2 or the casing 1 from freezing, thereby achieving the effect of antifreeze and heat preservation.

[0064] Specifically, Figure 1 and Figure 5 As shown, the heat preservation tube 51 in this embodiment is a half tube, and every two half tubes are plugged on the outer side of the winding tube 44, which is convenient for disassembly and can be reused.

[0065] Specifically, Figure 5 As shown, the heat conducting layer 52 in this embodiment is tin foil, which is bonded to the heat preservation tube 51. The tin foil has excellent thermal conductivity and can quickly diffuse and conduct the heat around the tube 44 to the tube wall.

[0066] Please combine Figure 1-Figure 5The process of antifreeze heating and disassembly and assembly is described as follows:

[0067] Antifreeze heating process

[0068] The water inlet pipe 41 transports the water to be heated to the igniter 3. After the igniter 3 works, the water is heated to obtain hot water. The hot water is transported to the inlet of the winding pipe 44 in the heat preservation pipe 51 through the water outlet pipe 42. The winding pipe 44 gradually heats up after the hot water is introduced. The hot water is transported to the transition pipe 45 and the branch pipe 46 respectively, thereby heating the casing 1, the oil pipe 2, the casing four-way 6 and half of each valve respectively. At the same time, the released heat is stored in the heat preservation pipe 51. The heat conductive layer 52 gradually transfers the heat to the casing 1, the oil pipe 2, the casing four-way 6 and the other half of each valve, thereby achieving the purpose of heating and antifreezing. The end outlet of the winding pipe 44 outputs water with a lower temperature. The water enters the igniter 3 through the return pipe 43 and is continuously heated to achieve the effect of repeated recycling and ensure continuous heating.

[0069] Disassembly process

[0070] When it is necessary to inspect the casing 1, the oil pipe 2, the casing spool 6 and the valves, it is only necessary to disconnect the connection between the bypass pipe 44 and the outlet pipe 42 and the return pipe 43. Since the bypass pipe 44, the transition pipe 45 and the branch pipe 46 are flexible, it is only necessary to remove the bypass pipe 44, the transition pipe 45 and the branch pipe 46. When the inspection is completed, the bypass pipe 44, the transition pipe 45 and the branch pipe 46 are reinstalled in the original position, so the disassembly and assembly process is simple and can be reused, which prolongs the service life of the bypass pipe 44 and reduces the inspection cost.

[0071] This specific embodiment is merely an explanation of the utility model, and it is not a limitation of the utility model. After reading this specification, those skilled in the art can make non-creative modifications to the embodiment as needed, but as long as it is within the protection scope of the utility model, it is protected by the patent law.

Claims

1. A water injection well head antifreeze device, It is characterized in that include: An igniter (3) is arranged in a preset area at the wellhead of the water injection well and is connected to an external power source for heating water by burning associated gas; A heat tracing component (4) is arranged on the wall of the wellhead of the water injection well, connected to the igniter (3) through a pipeline, and half-covered on the wall of the casing (1) and the oil pipe (2) at the wellhead of the water injection well. The igniter (3) is used to supply hot water to the heat tracing component (4) after the gas is introduced. The heat tracing component (4) is used to heat the casing (1) and the oil pipe (2); A heat preservation component (5) is arranged on the heating component (4), covers the heating component (4), the casing (1) and the oil pipe (2), and is used to transfer the heat of the heating component (4) to the casing (1) and the oil pipe (2).

2. The antifreeze device for the wellhead of a water injection well according to claim 1, It is characterized in that The heating assembly (4) comprises: A water inlet pipe (41) is arranged at the water inlet of the igniter (3), the water inlet is connected to the water injection pipeline of the water injection well, and the outlet is fixedly connected to the igniter (3). A water outlet pipe (42) is arranged on the igniter (3), and its inlet is fixedly connected to the igniter (3) and is used to output hot water heated after ignition of the igniter (3); The winding pipe (44) is respectively arranged on the oil pipe (2) and the casing (1), covering the pipe wall of the oil pipe (2) and the casing (1), and its inlet is connected to the outlet of the water outlet pipe (42), and is used to heat the pipe wall of the oil pipe (2) and the casing (1) through the hot water inside the winding pipe (44); The water return pipe (43) is arranged at the inlet of the igniter (3), connected to the end outlet of the winding pipe (44), and connected to the water inlet pipe (41), and is used to collect water in the water inlet pipe (41) and the water return pipe (43) for recycling and heating.

3. The antifreeze device for the wellhead of a water injection well according to claim 2, It is characterized in that The heating assembly (4) further comprises: A transition pipe (45) is arranged on the winding pipe (44) and is located on one side of the valve on the oil pipe (2) and is used to guide the transition pipe (45) from one side of the valve to the other side; A branch pipe (46) is arranged on the bypass pipe (44) and is located on the casing spool (6) of the water injection well. Its ends are respectively connected to the bypass pipe (44) and the transition pipe (45) for diverting hot water at the casing spool (6).

4. The antifreeze device for the wellhead of a water injection well according to claim 2, It is characterized in that The winding tube (44) is in a "bow" shape.

5. The antifreeze device for the wellhead of a water injection well according to claim 2, It is characterized in that The winding tube (44) is in a curved semicircular shape.

6. The antifreeze device for the wellhead of a water injection well according to claim 3, It is characterized in that The transition pipe (45) is semicircular.

7. The antifreeze device for the wellhead of a water injection well according to claim 3, It is characterized in that The winding pipe (44), the transition pipe (45) and the branch pipe (46) are all made of polyethylene.

8. The antifreeze device for the wellhead of a water injection well according to claim 2, It is characterized in that The heat preservation component (5) comprises: A heat preservation pipe (51) is arranged on the outside of the winding pipe (44) and is coated on the winding pipe (44); A heat-conducting layer (52) is arranged on the heat-retaining inner wall, in contact with the coil (44), and with a gap between the inner wall of the oil pipe (2) and the inner wall of the sleeve (1), and is used to transfer the heat of the coil (44) to the oil pipe (2) and the sleeve (1).

9. The antifreeze device for the wellhead of a water injection well according to claim 8, It is characterized in that The heat preservation tube (51) is a half tube, and every two half tubes are plugged onto the outer side of the winding tube (44).

10. The antifreeze device for the wellhead of a water injection well according to claim 8, It is characterized in that The heat conducting layer (52) is tin foil, and the tin foil is bonded to the heat preservation tube (51).

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