On-site liquid preparation device for oil well plug removal

Abstract

The on-site liquid preparation device comprises a moving trolley, a dissolving tank and a circulating water pump, the dissolving tank and the circulating water pump are arranged on the moving trolley, a feeding port is formed in the top of the dissolving tank, an input port is formed in one end of the dissolving tank, an output port is formed in the other end of the dissolving tank, a sealing cover is detachably installed on the feeding port, and the circulating water pump is arranged on the moving trolley. A liquid inlet pipe is installed on the input port, a liquid outlet pipe is installed on the output port, the circulating water pump is installed on the liquid inlet pipe, and the liquid inlet end of the liquid inlet pipe and the liquid outlet end of the liquid outlet pipe are each provided with a conveying tank connector. The on-site liquid preparation device for oil well plug removal has the advantages of being scientific in design, easy to operate, high in safety and high in practicability.

Description

Technical Field

[0001] This utility model relates to the field of oil well development technology, and more specifically, to an on-site liquid preparation device for unclogging oil wells. Background Technology

[0002] During oil well production, formations or wellbores are prone to blockage due to scaling and other reasons. When drilling into ultra-deep, ultra-high pressure, low-porosity, and low-permeability fractured sandstone reservoirs, barite is often added to the drilling fluid as a solid phase weighting material. However, the barite weighting material in the drilling fluid may leak out and block natural fractures. Unlike ordinary scale, barite is a non-metallic mineral product with barium sulfate as its main component. It is chemically stable and insoluble in acid. Existing acidizing technologies cannot effectively solve its blockage problem, making it quite difficult to deal with.

[0003] Existing methods for unclogging barite wells require the preparation of specialized unclogging solutions. For example, patent application number 201310722290.6 discloses a working fluid for unclogging oil and gas wells with barite. This fluid is composed of six chemical raw materials, including triacetic acid, pyridine 4-methylbenzenesulfonic acid, and sodium 2-butanone. To prevent the working fluid from becoming ineffective due to prolonged storage, a mixing tank is typically set up on-site. Water and chemical raw materials are transported to the work site using tank trucks and other transport vehicles. The chemical raw materials and water are then manually added to the mixing tank and stirred until homogeneous. This preparation method is not only cumbersome, but also carries the risk of splashing the working fluid onto the skin and eyes of workers during preparation, potentially causing injury.

[0004] In order to solve the above problems, people have been seeking an ideal technological solution. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a scientifically designed, simple-to-operate, highly safe, and practical on-site fluid preparation device for unclogging oil wells.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: an on-site liquid preparation device for unclogging oil wells, comprising a mobile trolley, a dissolving tank and a circulating water pump mounted on the mobile trolley, wherein the dissolving tank has a feeding port on the top, an input port at one end and an output port at the other end, a sealing cap is detachably installed on the feeding port, an inlet pipe is installed on the input port, an outlet pipe is installed on the output port, the circulating water pump is mounted on the inlet pipe, and a transport tank connector is provided at both the inlet end of the inlet pipe and the outlet end of the outlet pipe.

[0007] Beneficial effects: The mobile trolley facilitates pushing the equipment next to the transport tanker. The inlet pipe and outlet pipe are connected to the outlet and inlet of the transport tank through the transport tank connector, forming a circulation loop. Then, each chemical raw material is put into the dissolving tank through the feeding port, the sealing cover is closed, and the circulating water pump is started. The water in the transport tank begins to circulate through the dissolving tank, eventually completely dissolving the chemical raw materials. At the same time, through the circulation of the solution, the solution in the transport tank can quickly reach a uniform state. Compared with the traditional mixing tank, its operation is simpler, and the solution will not spill, making it safer.

[0008] Based on the above, the dissolving tank is also provided with two partitions, the feeding port is located inside the two partitions, and the input port and the output port are located outside the two partitions respectively.

[0009] Beneficial effect: The separation mesh can prevent large pieces of raw material from entering the liquid outlet pipe or the liquid inlet pipe and causing blockage.

[0010] Based on the above, the dissolving tank is also provided with two short pipes for liquid flow, and the two partitions are respectively provided with installation ports at both ends of each short pipe for liquid flow, and the two short pipes for liquid flow are located near the edge of the partition.

[0011] Beneficial effects: In the initial stage of dissolution, the two partitions are filled with a large amount of chemical raw materials, resulting in high resistance to the flow of circulating water. The two short liquid-passing pipes can ensure the smooth passage of circulating water, reduce the pressure inside the tank, provide sufficient time for the dissolution of chemical raw materials, and improve operational stability.

[0012] Based on the above, it also includes an air inlet pipe, on which an air inlet pump and an air inlet valve are installed. The air outlet of the air inlet pipe is connected to the input port, which is located at the upper corner of the dissolving tank, and the output port is located at the lower corner of the dissolving tank.

[0013] Beneficial effects: After dissolution is complete, the valve on the outlet of the transport tank can be closed, the air pump and the air valve can be opened to introduce air into the dissolution tank, and the remaining solution in the tank can be gradually discharged into the transport tank. Then, the valve on the inlet of the transport tank can be closed, and the transport tank connector can be disconnected.

[0014] Based on the above, an observation window is also provided on the side wall of the dissolving tank to observe the dissolving process inside the tank.

[0015] Beneficial effects: Facilitates observation of the dissolution and emptying process within the container. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the on-site fluid preparation device for unclogging oil wells in this utility model.

[0017] Figure 2 This is a schematic diagram of the on-site fluid mixing device for unclogging oil wells in the present invention under operating conditions.

[0018] Figure 3 This is a schematic diagram of the structure of the separator mesh in this utility model.

[0019] In the diagram: 1. Mobile trolley; 2. Dissolving tank; 3. Circulating water pump; 4. Feed inlet; 5. Input port; 6. Output port; 7. Sealing cap; 8. Liquid inlet pipe; 9. Liquid outlet pipe; 10. Transport tank connector; 11. Separator net; 12. Liquid flow short pipe; 13. Air inlet pipe; 14. Air inlet pump; 15. Air inlet valve; 16. Observation window; 17. Transport tanker; 18. Transport tank; 19. Liquid outlet; 20. Liquid inlet. Detailed Implementation

[0020] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0021] like Figure 1-3 As shown, an on-site liquid preparation device for unclogging oil wells includes a mobile trolley 1, a dissolving tank 2 mounted on the mobile trolley 1, and a circulating water pump 3. The dissolving tank 2 has a feeding port 4 at the top, an input port 5 at one end, and an output port 6 at the other end. A sealing cover 7 is detachably installed on the feeding port 4, and a sealing gasket can be placed at the bottom of the sealing cover 7. During installation, a flange connection or a snap-fit ​​connection can be used. An inlet pipe 8 is installed on the input port 5, and an outlet pipe 9 is installed on the output port 6. The circulating water pump 3 is installed on the inlet pipe 8. Both the inlet end of the inlet pipe 8 and the outlet end of the outlet pipe 9 are provided with transport tank connectors 10.

[0022] In practical use, the mobile trolley 1 is first pushed next to the transport tanker 17. The inlet pipe 8 and the outlet pipe 9 are connected to the outlet 19 and inlet 20 on the transport tank 18 through the transport tank connector 10, forming a circulation loop. Then, each chemical raw material is put into the dissolving tank 2 through the feeding port 4, the sealing cover 7 is closed, and the circulating water pump 3 is started. The water in the transport tank 18 begins to circulate through the dissolving tank 2, eventually completely dissolving the chemical raw materials. At the same time, through the circulation of the solution, the solution in the transport tank 18 can quickly reach a uniform state. When the solution in one transport tanker 17 is prepared, the valves on the outlet 19 and inlet 20 can be closed, the transport tank connector 10 can be removed, and then the mobile trolley 1 is pushed next to the next transport tanker 17 to continue preparing the unblocking working solution.

[0023] The applicant, through on-site use of the aforementioned equipment, discovered that large pieces of raw material would enter the outlet pipe 9 or the inlet pipe 8 during operation, causing blockages. To solve this problem, the dissolving tank 2 is also equipped with two partition nets 11. The feeding port 4 is located inside the two partition nets 11, and the input port 5 and output port 6 are located outside the two partition nets 11, respectively. During use, large pieces of chemical raw material are blocked between the two partition nets 11, and circulating water gradually dissolves them after passing through the partition nets 11.

[0024] When the applicant continued to use the aforementioned equipment for production, it was discovered that during the initial dissolution stage, the large amount of chemical raw materials filling the two partitions 11 resulted in significant resistance to the flow of circulating water, affecting the stable operation of the equipment. To address this issue, two short liquid-passing pipes 12 were installed inside the dissolution tank 2. Installation ports were provided at both ends of each short liquid-passing pipe 12 corresponding to the two partitions 11, and the two short liquid-passing pipes 12 were positioned near the edge of the partitions 11. These short liquid-passing pipes 12 ensured smooth flow of circulating water, reduced the pressure inside the tank, and provided sufficient time for the dissolution of the chemical raw materials, thereby improving the operational stability of the equipment.

[0025] To facilitate the discharge of residual solution from the dissolving tank 2, the on-site liquid preparation device for well unblocking also includes an air inlet pipe 13. An air inlet pump 14 and an air inlet valve 15 are installed on the air inlet pipe 13. The air outlet of the air inlet pipe 13 is connected to the input port 5, which is located at the upper corner of the dissolving tank 2. The output port 6 is located at the lower corner of the dissolving tank 2. After dissolution is complete, the valve 19 at the outlet of the transport tank 18 can be closed, and the air inlet pump 14 and the air inlet valve 15 can be opened to introduce air into the dissolving tank 2, gradually discharging the residual solution into the transport tank 18. Then, the valve at the inlet 20 of the transport tank 18 is closed, and the transport tank connector 10 is disconnected. In actual use, the transport tank 18 may not be completely filled to prevent air from entering and forming bubbles, which could cause the unblocking working fluid to splash out from the top inlet of the tank.

[0026] To facilitate observation of the dissolution and evacuation processes within the tank, an observation window 16 is provided on the side wall of the dissolution tank 2.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A field fluid preparation device for unclogging oil wells, characterized in that: The device includes a mobile trolley, a dissolving tank mounted on the mobile trolley, and a circulating water pump. The dissolving tank has a feeding port on the top, an input port at one end, and an output port at the other end. A sealing cap is detachably installed on the feeding port. An inlet pipe is installed on the input port, and an outlet pipe is installed on the output port. The circulating water pump is installed on the inlet pipe. Both the inlet end of the inlet pipe and the outlet end of the outlet pipe are equipped with transport tank connectors.

2. The on-site liquid preparation device for oil well plugging according to claim 1, characterized in that: The dissolving tank is also equipped with two partition nets. The feeding port is located inside the two partition nets, and the input port and the output port are located outside the two partition nets, respectively.

3. The on-site liquid preparation device for oil well plugging according to claim 2, characterized in that: The dissolving tank is also equipped with two short liquid-passing pipes. The two partitions are respectively provided with installation ports at both ends of each short liquid-passing pipe. The two short liquid-passing pipes are located near the edge of the partition.

4. The on-site fluid preparation device for unclogging oil wells according to any one of claims 1-3, characterized in that: It also includes an air inlet pipe, on which an air inlet pump and an air inlet valve are installed. The air outlet of the air inlet pipe is connected to the input port, which is located at the upper corner of the dissolving tank, and the output port is located at the lower corner of the dissolving tank.

5. The on-site fluid preparation device for unclogging oil wells according to claim 4, characterized in that: The dissolving tank is also equipped with an observation window on its side wall to observe the dissolving process inside the tank.

Images