Oil well dosing device

Abstract

The invention provides an oil well dosing device, and belongs to the field of oil field development equipment. The oil well dosing device comprises a dosing tank, an inlet unit, a dosing pump, an outlet unit, a wellhead connecting assembly and a detection control assembly. The dosing tank is communicated with one end of the inlet unit, and the other end of the inlet unit is communicated with an inlet of the dosing pump; one end of the outlet unit is communicated with an outlet of the dosing pump; the first end of the wellhead connecting assembly is communicated with the other end of the outlet unit, and the detection control assembly is connected with the dosing pump and the wellhead connecting assembly. According to the invention, medicine can be reasonably added to the casing pipe according to the pressure of the casing pipe.

Description

Technical Field

[0001] The present invention belongs to the field of oilfield development equipment, and in particular relates to an oil well dosing device. Background Art

[0002] In CO2 huff and puff wells, the mixed produced fluid corrodes the wellbore, gathering and transportation pipelines and other facilities, resulting in short pump inspection cycles and frequent leakage pollution, which poses serious safety and environmental risks to CO2 huff and puff wells. Therefore, it is necessary to add corrosion inhibitors to the wellbore of the CO2 huff and puff well to reduce the corrosion rate of the wellbore and ground pipelines.

[0003] In the related art, adding medicine into the wellbore is generally achieved through an oil well dosing device. The oil well dosing device includes a dosing tank, a dosing pump, a control valve, and a dosing pipeline. Among them, the dosing pump is connected to the dosing tank, and the inlet of the dosing pump is connected to the inside of the dosing tank through the dosing pipeline, the outlet of the dosing pump is connected to the inlet of the control valve through the dosing pipeline, and the outlet of the control valve is connected to the casing of the oil well's Christmas tree through the dosing pipeline. Open the dosing pump and the control valve regularly, and the dosing pump can pump the liquid medicine in the dosing tank into the casing.

[0004] However, during the above dosing process, if the pressure in the casing is high, the reagent cannot be smoothly added into the wellbore even under the drive of the dosing pump. This not only affects the dosing, but also poses certain safety hazards due to the high pressure in the casing. Summary of the invention

[0005] The embodiment of the present disclosure provides an oil well dosing device, which can reasonably add drugs to the casing according to the pressure of the casing. The technical solution is as follows:

[0006] The embodiment of the present disclosure provides an oil well dosing device, which includes a dosing tank, an inlet unit, a dosing pump, an outlet unit, a wellhead connection assembly and a detection and control assembly; the dosing tank is connected to one end of the inlet unit, and the other end of the inlet unit is connected to the inlet of the dosing pump; one end of the outlet unit is connected to the outlet of the dosing pump; the first end of the wellhead connection assembly is connected to the other end of the outlet unit, the second end of the wellhead connection assembly is used to communicate with the casing of the oil well Christmas tree, the third end of the wellhead connection assembly is used to selectively communicate with the atmosphere, and the wellhead connection The first end, the second end and any two ends of the third end of the component are selectively connected; the detection control component is connected to the dosing pump and the wellhead connection component, and the detection control component is configured to: detect the pressure in the casing, and when the pressure in the casing is lower than a first threshold, control the dosing pump to open according to the dosing demand, and control the first end and the second end of the dosing control main valve to be connected to add medicine to the casing, when the pressure in the casing is higher than the first threshold, control the dosing pump to be closed, and control the second end and the third end of the wellhead connection component to be connected to release the pressure in the casing.

[0007] In another implementation of the present disclosure, the wellhead connection assembly includes a main dosing control valve, a casing dosing control valve and a surface pipeline dosing control valve, the inlet of the main dosing control valve is connected to the other end of the outlet unit, the outlet of the main dosing control valve is connected to the inlet of the casing dosing control valve, the outlet of the casing dosing control valve is connected to the casing of the Christmas tree of the oil well, the surface pipeline dosing control valve is connected between the main dosing control valve and the casing dosing control valve, the inlet of the surface pipeline dosing control valve is connected to the outlet of the main dosing control valve, and the surface pipeline dosing control valve is connected to the main dosing control valve. The outlet of the surface pipeline dosing control valve is used to communicate with the ground pipeline, and the ground pipeline is selectively connected to the atmosphere; the detection control component is electrically connected to the dosing pump, the dosing control main valve, the casing dosing control valve and the ground pipeline dosing control valve respectively; and the detection control component is configured to control the dosing pump and the dosing control main valve to open according to the dosing demand when the pressure in the casing is lower than the first threshold value, and control at least one of the casing dosing control valve and the ground pipeline dosing control valve to open to add medicine to the casing or the ground pipeline.

[0008] In another embodiment of the present disclosure, the wellhead connection assembly further includes a first one-way valve, an inlet of the first one-way valve is connected to an outlet of the surface pipeline dosing control valve, and an outlet of the first one-way valve is connected to the surface pipeline.

[0009] In yet another implementation of the present disclosure, the outlet unit comprises an outlet control valve, an inlet of the outlet control valve is communicated with an outlet of the dosing pump, and an outlet of the outlet control valve is communicated with an inlet of the dosing control main valve.

[0010] In another embodiment of the present disclosure, the outlet unit also includes a safety valve, which is connected between the outlet of the dosing pump and the inlet of the dosing control main valve, the inlet of the safety valve is connected to the outlet of the dosing pump, the outlet of the safety valve is connected to the inlet of the dosing control main valve, and the pressure relief port of the safety valve is connected to the dosing tank.

[0011] In another embodiment of the present disclosure, the outlet unit further includes a reflux control valve, which is connected between the safety valve and the outlet control valve, the inlet of the reflux control valve is connected to the outlet of the safety valve, and the outlet of the reflux control valve is connected to the dosing tank.

[0012] In yet another implementation of the present disclosure, the inlet unit includes an inlet control valve, the inlet of the inlet control valve is communicated with the dosing tank, and the outlet of the inlet control valve is communicated with the inlet of the dosing pump.

[0013] In another implementation of the present disclosure, the detection control component includes a controller and a casing pressure sensor, the casing pressure sensor is electrically connected to the controller; the casing pressure sensor is connected to the casing of the oil well's Christmas tree to detect the pressure of the casing; the controller is electrically connected to the dosing pump, the dosing control main valve, the casing dosing control valve and the surface pipeline dosing control valve, respectively, and when the pressure value detected by the casing pressure sensor is higher than a first threshold value, the controller controls the dosing pump to close, and controls the casing dosing control valve and the surface pipeline dosing control valve to open; when the pressure value detected by the casing pressure sensor is lower than the first threshold value, the controller selectively controls the dosing pump to open and the dosing control main valve to open according to the dosing demand, and selectively controls at least one of the casing dosing control valve and the surface pipeline dosing control valve to open.

[0014] In another implementation of the present disclosure, the detection control component further includes an oil pressure sensor, which is connected to the oil pipe of the oil tree of the oil well to detect the pressure of the oil pipe, and the oil pressure sensor is electrically connected to the controller; the pressure value detected by the oil pressure sensor is the first threshold value.

[0015] In another implementation of the present disclosure, the dosing tank includes a tank body, an outer shell and a base; the tank body is located inside the outer shell and is connected to the inner wall of the outer shell, a dosing hole is provided on the top of the tank body, and the dosing hole is connected to the outside of the outer shell; the base is located outside the outer shell and on one side of the bottom of the tank body, and the base is connected to the outer shell.

[0016] The technical solution provided by the embodiments of the present disclosure brings the following beneficial effects:

[0017] When the oil well dosing device provided by the embodiment of the present disclosure is connected to an oil well for use, the dosing tank in the oil well dosing device can be used to store the medicine, and the dosing pump can be connected to the dosing tank through the inlet unit, so that when the dosing pump is turned on, the medicine in the dosing tank can be pumped out according to demand. In addition, the dosing pump can also be connected to the wellhead connection component through the outlet unit, so that the medicine pumped out from the dosing tank by the dosing pump enters the casing through the wellhead connection component to dosing the casing.

[0018] In addition, because the detection control component is configured to control the dosing pump to open according to the dosing demand when the pressure in the casing is lower than the first threshold, and control the first end of the dosing control main valve to communicate with the second end to add medicine to the casing, when the pressure in the casing is higher than the first threshold, control the dosing pump to close, and control the second end of the wellhead connection component to communicate with the third end to release the pressure in the casing, so that when the pressure in the casing is within a normal range (that is, when the pressure of the casing is lower than the first threshold), according to the dosing demand of the oil well, the casing can be automatically dosed through the wellhead connection component. When the pressure of the casing is not within the normal range (that is, when the pressure of the casing is higher than the first threshold), the dosing pump is automatically controlled to close, so that the medicine in the dosing tank cannot be pumped out. In addition, the second end of the wellhead connection component is controlled to communicate with the third end to release the pressure in the casing, and the pressure of the casing is released in time, so that the oil well will not have production accidents due to the high pressure of the casing, thereby improving the production safety of the oil well.

[0019] It can be seen that the oil well dosing device provided in the embodiment of the present disclosure can automatically control whether to add drugs into the casing according to the pressure of the casing and in combination with the dosing demand, and at the same time can release the casing pressure in time to improve the production safety of the oil well. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a structural schematic diagram of an oil well dosing device provided in a disclosed embodiment;

[0022] Figure 2 is a schematic diagram of the structure of the import unit and the export unit provided in the embodiment of the present disclosure;

[0023] Figure 3 It is a structural schematic diagram of a wellhead connection assembly provided in an embodiment of the present disclosure.

[0024] The symbols in the figure mean the following:

[0025] 1. Dosing tank; 11. Tank body; 110. Dosing hole; 12. Shell; 120. Heat dissipation hole; 13. Base; 14. Liquid level meter;

[0026] 2. Import unit; 21. Import control valve; 22. Filter;

[0027] 3. Dosing pump;

[0028] 4. Outlet unit; 41. Outlet control valve; 42. Safety valve; 43. Backflow control valve;

[0029] 5. Wellhead connection assembly; 51. Dosing control main valve; 52. Casing dosing control valve; 53. Ground pipeline dosing control valve; 54. First check valve; 55. Second check valve; 501. First end; 502. Second end; 503. Third end;

[0030] 6. Detection control component; 61. Controller; 62. Casing pressure sensor; 63. Oil pressure sensor. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0032] The present disclosure provides an oil well dosing device, such as Figure 1 As shown, the oil well dosing device includes a dosing tank 1, an inlet unit 2, a dosing pump 3, an outlet unit 4, a wellhead connection assembly 5 and a detection control assembly 6. The dosing tank 1 is connected to one end of the inlet unit 2, and the other end of the inlet unit 2 is connected to the inlet of the dosing pump 3. One end of the outlet unit 4 is connected to the outlet of the dosing pump 3, and the other end of the outlet unit 4 is connected to the first end 501 of the wellhead connection assembly 5 (see Figure 3 )Connect( Figure 1 The second end 502 of the wellhead connection assembly 5 (see Figure 3 ) is used to communicate with the casing of the oil tree of the oil well, and the third end 503 of the wellhead connection assembly 5 (see Figure 3) is used to selectively communicate with the atmosphere, and any two ends of the first end, the second end and the third end of the wellhead connection assembly 5 are selectively connected.

[0033] The detection control component 6 is connected to the casing of the Christmas tree, the dosing pump 3 and the wellhead connection component 5. The detection control component 6 is configured to: detect the pressure in the casing, and when the pressure in the casing is lower than the first threshold, control the dosing pump 3 to start according to the dosing demand, and control the first end of the wellhead connection component 5 to communicate with the second end to add drugs to the casing, and when the pressure in the casing is higher than the first threshold, control the dosing pump 3 to close, and control the second end of the wellhead connection component 5 to communicate with the third end to release the pressure in the casing.

[0034] When the oil well dosing device provided by the embodiment of the present disclosure is connected to an oil well for use, the dosing tank 1 in the oil well dosing device can be used to store the medicine, and the dosing pump 3 can be connected to the dosing tank 1 through the inlet unit 2, so that when the dosing pump 3 is turned on, the medicine in the dosing tank 1 can be pumped out according to demand. In addition, the dosing pump 3 can also be connected to the wellhead connection component 5 through the outlet unit 4, so that the medicine pumped from the dosing tank 1 by the dosing pump 3 enters the casing through the wellhead connection component 5 to dosing the casing.

[0035] In addition, because the detection control component 6 is configured to detect the pressure in the casing, and when the pressure in the casing is lower than the first threshold, the dosing pump 3 is controlled to open according to the dosing demand, and the first end of the dosing control main valve 51 is controlled to be connected to the second end to add medicine to the casing, when the pressure in the casing is higher than the first threshold, the dosing pump 3 is controlled to be closed, and the second end of the wellhead connection component 5 is controlled to be connected to the third end to release the pressure in the casing. In this way, when the pressure in the casing is within a normal range (that is, when the pressure of the casing is lower than the first threshold), according to the dosing demand of the oil well, the casing can be automatically dosed through the wellhead connection component 5. When the pressure of the casing is not within the normal range (that is, when the pressure of the casing is higher than the first threshold), the dosing pump 3 is automatically controlled to be closed, so that the medicine in the dosing tank 1 cannot be pumped out, and the second end of the wellhead connection component 5 is controlled to be connected to the third end to release the pressure in the casing, and the pressure of the casing is released in time, so that the oil well will not have production accidents due to the high pressure of the casing, thereby improving the production safety of the oil well.

[0036] It can be seen that the oil well dosing device provided in the embodiment of the present disclosure can automatically control whether to add drugs into the casing according to the pressure of the casing and in combination with the dosing demand, and at the same time can release the casing pressure in time to improve the production safety of the oil well.

[0037] The above-mentioned demand for adding drugs refers to confirming whether it is necessary to add drugs to the casing according to the actual production process of the oil well. For example, when the viscosity of the oil in the casing is detected to exceed a certain value, it means that the casing needs to be added with drugs to reduce the viscosity. In other words, the demand for adding drugs is determined based on the production process of the oil well and the type of formation fluid produced by the oil well.

[0038] In this embodiment, the first end, the second end and the third end of the wellhead connection component 5 are selectively connected, which means that the wellhead connection component 5 can be controlled according to actual needs so that the first end, the second end and the third end of the wellhead connection component 5 are connected to each other, or only the first end of the wellhead connection component 5 is connected to the second end, or the first end of the wellhead connection component 5 is connected to the third end, or the second end of the wellhead connection component 5 is connected to the third end.

[0039] Optionally, the dosing tank 1 includes a tank body 11, a shell 12 and a base 13, the tank body 11 is located in the shell 12, and the inner wall of the shell 12 is connected, and the top of the tank body 11 is provided with a dosing hole 110, and the dosing hole 110 is communicated with the outside of the shell 12. The base 13 is located outside the shell 12 and is located on one side of the bottom of the tank body 11, and the base 13 is connected to the shell 12. The dosing pump 3 is located in the shell 12 and is connected to the shell 12.

[0040] In the above implementation, the dosing tank 1 is configured as the above structure, so that the base 13 can support the outer shell 12 , and the outer shell 12 can protect the tank body 11 and the dosing pump 3 .

[0041] For example, the tank body 11, the shell 12 and the base 13 are all made of 316L stainless steel, which is not only easy to process and low in cost, but also highly resistant to corrosion, preventing the chemical from corroding the dosing tank 1, so that the dosing tank 1 can adapt to long-term harsh working environments in the field and extend its service life.

[0042] An end cover is provided on the dosing hole 110, so that the tank body 11 can be closed when the dosing tank 1 is not adding medicine.

[0043] Optionally, the dosing tank 1 further comprises a liquid level meter 14, which is connected to the tank body 11. The liquid level meter 14 is used to detect the volume of the medicine in the tank body 11 in real time.

[0044] The liquid level meter 14 is a glass tube liquid level meter, which can display the amount of medicine inside the tank body 11 through the glass tube, so that the medicine can be metered and added as needed.

[0045] Optionally, the housing 12 has a plurality of heat dissipation holes 120 connected to the side wall. The heat dissipation holes 120 can discharge the heat accumulated inside the housing 12 to ensure the normal operation of the dosing pump 3.

[0046] Figure 2 is a schematic diagram of the structure of the import unit and the export unit provided in the embodiment of the present disclosure, combined with Figure 2 Optionally, the inlet unit 2 includes an inlet control valve 21 , and the inlet of the inlet control valve 21 is connected to the dosing tank 1 , and the outlet of the inlet control valve 21 is connected to the inlet of the dosing pump 3 .

[0047] In the above implementation, the inlet control valve 21 is used to control whether the dosing tank 1 and the dosing pump 3 are connected.

[0048] Optionally, the inlet unit 2 further includes a filter 22 , which is connected between the inlet control valve 21 and the dosing pump 3 , and the inlet of the filter 22 is communicated with the outlet of the inlet control valve 21 , and the outlet of the filter 22 is communicated with the inlet of the dosing pump 3 .

[0049] In the above implementation, the filter 22 is used to filter impurities in the inlet unit 2 to prevent the inlet of the dosing pump 3 from being blocked.

[0050] In this embodiment, the inlet unit 2 can be fixedly installed near the bottom of the dosing tank 1. For example, the inlet unit 2 is installed at a corresponding position of the dosing tank 1 at a distance of more than 20 cm from the bottom of the dosing tank 1. Of course, in order to facilitate the outflow of the agent, the inlet of the inlet control valve 21 in the inlet unit 2 can also be arranged at the bottom of the dosing tank 1.

[0051] In this embodiment, all components in the inlet unit 2 are connected through corresponding connecting pipelines, and the connecting pipelines can be plastic pipes or steel pipes.

[0052] In addition, in order to facilitate the disassembly and assembly of the inlet unit 2, the inlet unit 2 may also be provided with an inlet oil port (ie, a joint), and the inlet unit 2 is connected and communicated with the inlet of the dosing pump 3 via the inlet oil port.

[0053] Optionally, the outlet unit 4 includes an outlet control valve 41, the inlet of the outlet control valve 41 is connected to the outlet of the dosing pump 3, and the outlet of the outlet control valve 41 is connected to the inlet of the dosing control main valve 51 (see the dosing control main valve 51 below).

[0054] In the above implementation, the outlet control valve 41 controls whether the outlet of the dosing pump 3 is connected to the wellhead connection assembly 5 .

[0055] Optionally, the outlet unit 4 also includes a safety valve 42, which is connected between the outlet of the dosing pump 3 and the inlet of the outlet control valve 41, the inlet of the safety valve 42 is connected to the outlet of the dosing pump 3, the outlet of the safety valve 42 is connected to the inlet of the outlet control valve 41, and the pressure relief port of the safety valve 42 is connected to the dosing tank 1.

[0056] In the above implementation, the safety valve 42 is used to protect the outlet pipeline. When the outlet pressure of the dosing pump 3 is too high, the safety valve 42 releases the pressure.

[0057] The safety valve 42 is connected to the top of the dosing tank 1 through a pipeline, so that the medicine released from the safety valve 42 can be returned to the inside of the dosing tank 1 through the pipeline, avoiding waste of medicine and environmental pollution.

[0058] Optionally, the outlet unit 4 further comprises a reflux control valve 43 , which is connected between the safety valve 42 and the outlet control valve 41 , the inlet of the reflux control valve 43 is connected to the outlet of the safety valve 42 , and the outlet of the reflux control valve 43 is connected to the dosing tank 1 .

[0059] In the above implementation, for wells with different dosages, the dosage can be adjusted by the dosage pump 3. When the minimum flow of the dosage pump 3 is still greater than the dosage required by the oil well, the reflux control valve 43 can be opened to adjust the dosage of the oil well to meet the production needs of the oil well and save the cost of the agent.

[0060] The reflux control valve 43 is also connected to the top of the dosing tank 1 through a pipeline, and the reagent regulated and controlled by the reflux control valve 43 can be returned to the inside of the dosing tank 1 through the pipeline.

[0061] Similarly, in order to facilitate the disassembly and assembly of the outlet unit 4, the outlet unit 4 may also be provided with an outlet oil port (ie, a joint), and the outlet unit 4 is connected to the inlet of the wellhead connection assembly 5 via the outlet oil port.

[0062] The outlet oil pipe serves to facilitate the removal and installation of the pipeline of the outlet unit 4 during maintenance.

[0063] In this embodiment, the dosing pump 3 is a proportional pump, the outlet pressure is designed to be 10MPa, and the flow rate is 0-10L / h. The outlet pressure and flow rate of the dosing pump 3 can also be reasonably selected according to different lifting processes, different well conditions, etc.

[0064] Figure 3 is a schematic diagram of the structure of the wellhead connection assembly provided in the embodiment of the present disclosure, combined with Figure 3Optionally, the wellhead connection assembly 5 includes a dosing control main valve 51, a casing dosing control valve 52 and a surface pipeline dosing control valve 53, the inlet of the dosing control main valve 51 is connected to the other end of the outlet unit 4, the outlet of the dosing control main valve 51 is connected to the inlet of the casing dosing control valve 52, the outlet of the casing dosing control valve 52 is connected to the casing of the oil well Christmas tree, the surface pipeline dosing control valve 53 is connected between the dosing control main valve 51 and the casing dosing control valve 52, the inlet of the surface pipeline dosing control valve 53 is connected to the outlet of the dosing control main valve 51, the outlet of the surface pipeline dosing control valve 53 is used to communicate with the surface pipeline, and the surface pipeline is selectively connected to the atmosphere. The detection control assembly 6 is electrically connected to the dosing pump 3, the dosing control main valve 51, the casing dosing control valve 52 and the surface pipeline dosing control valve 53 respectively.

[0065] The detection control component 6 is configured to control the dosing pump 3 and the dosing control main valve 51 to open according to the dosing demand when the pressure in the casing is lower than the first threshold value, and control at least one of the casing dosing control valve 52 and the ground pipeline dosing control valve 53 to open to add medicine to the casing or the ground pipeline.

[0066] In the above implementation, the dosing control main valve 51 is used to control whether the outlet unit 4 is connected to the casing dosing control valve 52 and the surface pipeline dosing control valve 53. The casing dosing control valve 52 is used to control whether the outlet unit 4 is connected to the casing, and the surface pipeline dosing control valve 53 is used to control whether the outlet unit 4 is connected to the surface pipeline.

[0067] That is to say, the arrangement of the above valve components can automatically control casing dosing and surface dosing according to the pressure conditions of the casing and the like in the oil well and the dosing needs.

[0068] For example, when both the ground and the casing need to be dosing, the detection control component 6 controls the dosing pump 3 to start, and the detection control component 6 controls the dosing control main valve 51, the ground pipeline dosing control valve 53, and the casing dosing control valve 52 to open.

[0069] When only one of the ground pipeline or casing needs to be dosed, the detection control component 6 controls the dosing pump 3 to start, the detection control component 6 controls the dosing control main valve 51 to open, and the detection control component 6 controls one of the ground pipeline dosing control valve or the casing dosing control valve 52 to open and the other to close.

[0070] When the detection control component 6 detects that the pressure in the casing rises to a value exceeding the first threshold value, the pressure in the casing is too high and gas appears, which will affect the normal production of the oil well. Moreover, the excessive pressure in the casing will also affect the dosage. At this time, the detection control component 6 controls the dosing pump 3 to stop operating, the detection control component 6 controls the dosing control main valve 51 to close, and the casing dosing control valve 52 and the surface pipeline dosing control valve 53 are both opened normally, and the gas in the casing is discharged to the surface pipeline through the pipeline to ensure the normal production of the oil well.

[0071] When the detection control component 6 detects that the pressure in the casing drops to a normal value, the detection control component 6 controls the dosing control main valve 51 to open, and controls the dosing pump 3 to start, and the casing dosing control valve 52 and the ground pipeline dosing control valve 53 are both opened normally.

[0072] Whether the surface pipeline needs to be added with chemicals is also determined based on the actual production process of the oil well. For example, when the viscosity of the oil in the surface pipeline is detected to exceed a certain value, it means that the surface pipeline needs to be added with chemicals to reduce the viscosity.

[0073] Of course, the need to add chemicals is not limited to the above-mentioned situations, and may also be other situations, for example, intermittently adding chemicals to the carbon dioxide injection well to reduce the corrosion rate of the wellbore and ground pipelines.

[0074] Optionally, the wellhead connection assembly 5 further includes a first one-way valve 54, the inlet of the first one-way valve 54 is connected to the outlet of the surface pipeline dosing control valve 53, and the outlet of the first one-way valve 54 is connected to the surface pipeline.

[0075] In the above implementation, the first one-way valve 54 plays a protective role, and the liquid medicine can only flow out from the surface pipeline dosing control valve 53 and cannot return.

[0076] Optionally, the wellhead connection assembly 5 further includes a second one-way valve 55 , the inlet of the second one-way valve 55 is connected to the outlet of the dosing control main valve 51 , and the outlet of the second one-way valve 55 is connected to the inlet of the casing dosing control valve 52 .

[0077] In the above implementation, the second one-way valve 55 plays a protective role, and the fluid can only flow out from the dosing control main valve 51 and cannot return.

[0078] In this embodiment, the dosing control main valve 51, the casing dosing control valve 52 and the surface pipeline dosing control valve 53 are all automatic electromagnetic control valves, which can automatically control the casing dosing and the surface dosing according to the well pressure conditions and the dosing needs.

[0079] Optionally, the detection control assembly 6 includes a controller 61 and a casing pressure sensor 62. The casing pressure sensor 62 is connected to the casing of the Christmas tree of the oil well to detect the pressure of the casing, and the casing pressure sensor 62 is electrically connected to the controller 61.

[0080] The controller 61 is electrically connected to the dosing pump 3, the dosing control main valve 51, the casing dosing control valve 52 and the surface pipeline dosing control valve 53. When the pressure value detected by the casing pressure sensor 62 is higher than the first threshold value, the controller 61 controls the dosing pump 3 to be closed, and controls the casing dosing control valve 52 and the surface pipeline dosing control valve 53 to be opened. When the pressure value detected by the casing pressure sensor 62 is lower than the first threshold value, the controller 61 selectively controls the dosing pump 3 to be opened and the dosing control main valve 51 to be opened according to the dosing demand, and selectively controls at least one of the casing dosing control valve 52 and the surface pipeline dosing control valve 53 to be opened.

[0081] In the above implementation, the detection control component 6 is set to be a controller 61 and a casing pressure sensor 62, so that the pressure in the casing can be detected by the casing pressure sensor 62 to provide a basis for the controller 61. The controller 61 controls the opening and closing of the dosing pump 3, the dosing control main valve 51, the casing dosing control valve 52 and the surface pipeline dosing control valve 53 according to the detection value of the casing pressure sensor 62 or the dosing demand.

[0082] Optionally, the detection control component 6 further includes an oil pressure sensor 63, which is connected to the oil pipe of the oil tree of the oil well to detect the pressure of the oil pipe, and is electrically connected to the controller 61. The pressure value detected by the oil pressure sensor 63 is the first threshold.

[0083] In the above implementation, the oil pressure sensor 63 is used to detect the pressure in the oil pipe. The pressure value detected by the oil pressure sensor 63 is the first threshold, so that the pressure of the casing can be compared with the pressure of the oil pipe. When the pressure of the casing is higher than the pressure of the oil pipe, it means that the casing pressure is too high and gas appears, which will cause abnormal production of the oil well. In normal circumstances, the pressure of the casing is lower than the pressure of the oil pipe.

[0084] The following is a brief introduction to the installation process and working process of the oil well dosing device provided by the embodiment of the present disclosure:

[0085] First, the tank body 11 is welded to the bottom of the shell 12, and the shell 12 is welded to the base 13, and then the dosing hole 110 is processed on the top of the tank body 11. Then the liquid level meter 14 is fixed in the tank body 11, and the heat dissipation hole 120 is processed in the tank body 11. The controller 61 is fixed in the shell 12. A pipeline jack connected to the safety valve 42 and the reflux control valve 43 is reserved at the top of the tank body 11.

[0086] Secondly, connect the dosing pump 3 and the inlet unit 2. Fix the dosing pump 3 to the bottom of the housing 12 by bolts and connect it to the base 13. Then connect the inlet control valve 21, the filter 22 and the inlet oil together by fasteners. One end of the inlet unit 2 is fixed to the inlet of the dosing pump 3, and the other end of the inlet unit 2 is welded to the bottom of the tank 11.

[0087] Next, the safety valve 42, the reflux control valve 43, the outlet control valve 41, and the outlet oil are connected together through pipelines in the same way, and the outlet unit 4 is fixed to the outlet of the dosing pump 3, and finally the assembly of the dosing device is completed.

[0088] Then, the oil well dosing device is connected to the wellhead of the oil well. According to the production site of the oil well, the dosing device is hoisted to the site, and the dosing control main valve 51, the second one-way valve 55, the casing dosing control valve 52, the ground pipeline dosing control valve 53, and the first one-way valve 54 are reasonably arranged at the wellhead and connected and fixed. The casing dosing control valve 52 is connected to the casing of the oil tree through a pipeline, and the ground pipeline dosing control valve is connected to the ground pipeline of the oil tree. Then the dosing control main valve 51, the casing dosing control valve 52, the oil pressure sensor 63, and the casing pressure sensor 62 are connected to the controller 61, and debugged. At the same time, the data of the controller 61 is remotely transmitted to the central control room corresponding to the oil well for remote command and control.

[0089] Finally, production operation. When both the ground and the casing need to add medicine, the detection control component 6 controls the dosing pump 3 to start, and the detection control component 6 controls the dosing control main valve 51, the ground pipeline dosing control valve 53, and the casing dosing control valve 52 to open. When the ground pipeline or casing only needs to add medicine for one process, the detection control component 6 controls the dosing pump 3 to start, the detection control component 6 controls the dosing control main valve 51 to open, and the detection control component 6 controls one of the ground pipeline dosing control valve or the casing dosing control valve 52 to open, and the other one to close. When the detection control component 6 detects that the pressure in the casing rises to more than the first threshold, the pressure in the casing is too high and gas appears, which will affect the normal production of the oil well. And the excessive pressure in the casing will also affect the amount of medicine added. At this time, the detection control component 6 controls the dosing pump 3 to stop operation, the detection control component 6 controls the dosing control main valve 51 to close, and the casing dosing control valve 52 and the ground pipeline dosing control valve 53 are both opened normally, and the gas in the casing is discharged to the ground pipeline through the pipeline to ensure the normal production of the oil well. When the detection control component 6 detects that the pressure in the casing drops to a normal value, the detection control component 6 controls the dosing control main valve 51 to open, and controls the dosing pump 3 to start, and the casing dosing control valve 52 and the ground pipeline dosing control valve 53 are both opened normally.

[0090] The dosing device provided in the above-mentioned embodiments of the present disclosure can realize continuous and accurate dosing of drugs under pressure at the wellhead of the production well, and dosing of drugs to the wellbore and the ground pipeline at the same time, which can effectively establish three-dimensional protection from the wellbore to the ground pipeline, and can also reduce the risks of safety and environmental hazards in the existing production process, and can also automatically control the casing pressure to ensure the normal production of the oil well.

[0091] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. An oil well dosing device, characterized in that: The oil well dosing device comprises a dosing tank (1), an inlet unit (2), a dosing pump (3), an outlet unit (4), a wellhead connection component (5) and a detection control component (6); The dosing tank (1) is connected to one end of the inlet unit (2), and the other end of the inlet unit (2) is connected to the inlet of the dosing pump (3); One end of the outlet unit (4) is in communication with the outlet of the dosing pump (3); The first end of the wellhead connection assembly (5) is in communication with the other end of the outlet unit (4), the second end of the wellhead connection assembly (5) is used to communicate with the casing of the oil tree of the oil well, the third end of the wellhead connection assembly (5) is used to selectively communicate with the atmosphere, and any two ends of the first end, the second end and the third end of the wellhead connection assembly (5) are selectively in communication with each other; The detection control component (6) is connected to the dosing pump (3) and the wellhead connection component (5), and the detection control component (6) is configured to: detect the pressure in the casing, and when the pressure in the casing is lower than a first threshold, control the dosing pump (3) to open according to the dosing demand, and control the first end of the wellhead connection component (5) to communicate with the second end to add drugs to the casing; when the pressure in the casing is higher than the first threshold, control the dosing pump (3) to close, and control the second end of the wellhead connection component (5) to communicate with the third end to release the pressure in the casing.

2. The oil well dosing device according to claim 1, characterized in that: The wellhead connection assembly (5) comprises a dosing control main valve (51), a casing dosing control valve (52) and a surface pipeline dosing control valve (53); the inlet of the dosing control main valve (51) is connected to the other end of the outlet unit (4); the outlet of the dosing control main valve (51) is connected to the inlet of the casing dosing control valve (52); the outlet of the casing dosing control valve (52) is connected to the casing; the surface pipeline dosing control valve (53) is connected between the dosing control main valve (51) and the casing dosing control valve (52); the inlet of the surface pipeline dosing control valve (53) is connected to the outlet of the dosing control main valve (51); the outlet of the surface pipeline dosing control valve (53) is used to communicate with a surface pipeline; and the surface pipeline is selectively connected to the atmosphere; The detection control component (6) is electrically connected to the dosing pump (3), the dosing control main valve (51), the casing dosing control valve (52) and the surface pipeline dosing control valve (53) respectively; The detection control component (6) is configured to control the dosing pump (3) and the dosing control main valve (51) to open according to the dosing demand when the pressure in the casing is lower than a first threshold value, and to control at least one of the casing dosing control valve (52) and the surface pipeline dosing control valve (53) to open so as to add medicine to the casing or the surface pipeline.

3. The oil well dosing device according to claim 2, characterized in that: The wellhead connection assembly (5) further comprises a first one-way valve (54), the inlet of the first one-way valve (54) being connected to the outlet of the surface pipeline dosing control valve (53), and the outlet of the first one-way valve (54) being connected to the surface pipeline.

4. The oil well dosing device according to claim 2, characterized in that: The outlet unit (4) comprises an outlet control valve (41), the inlet of the outlet control valve (41) is connected to the outlet of the dosing pump (3), and the outlet of the outlet control valve (41) is connected to the inlet of the dosing control main valve (51).

5. The oil well dosing device according to claim 4, characterized in that: The outlet unit (4) further comprises a safety valve (42), wherein the safety valve (42) is connected between the outlet of the dosing pump (3) and the inlet of the outlet control valve (41), the inlet of the safety valve (42) is communicated with the outlet of the dosing pump (3), the outlet of the safety valve (42) is communicated with the inlet of the outlet control valve (41), and the pressure relief port of the safety valve (42) is communicated with the dosing tank (1).

6. The oil well dosing device according to claim 5, characterized in that: The outlet unit (4) further comprises a reflux control valve (43), wherein the reflux control valve (43) is connected between the safety valve (42) and the outlet control valve (41), wherein the inlet of the reflux control valve (43) is connected to the outlet of the safety valve (42), and the outlet of the reflux control valve (43) is connected to the dosing tank (1).

7. The oil well dosing device according to claim 1, characterized in that: The inlet unit (2) comprises an inlet control valve (21), the inlet of the inlet control valve (21) is connected to the dosing tank (1), and the outlet of the inlet control valve (21) is connected to the inlet of the dosing pump (3).

8. The oil well dosing device according to claim 2, characterized in that: The detection control component (6) comprises a controller (61) and a casing pressure sensor (62), and the casing pressure sensor (62) is electrically connected to the controller (61); The casing pressure sensor (62) is connected to the casing to detect the pressure of the casing; The controller (61) is electrically connected to the dosing pump (3), the dosing control main valve (51), the casing dosing control valve (52) and the surface pipeline dosing control valve (53) respectively. When the pressure value detected by the casing pressure sensor (62) is higher than a first threshold value, the controller (61) controls the dosing pump (3) to be turned off, and controls the casing dosing control valve (52) and the surface pipeline dosing control valve (53) to be turned on. When the pressure value detected by the casing pressure sensor (62) is lower than a first threshold value, the controller (61) selectively controls the dosing pump (3) to be turned on and the dosing control main valve (51) to be turned on according to the dosing demand, and selectively controls at least one of the casing dosing control valve (52) and the surface pipeline dosing control valve (53) to be turned on.

9. The oil well dosing device according to claim 8, characterized in that: The detection control component (6) further comprises an oil pressure sensor (63), wherein the oil pressure sensor (63) is connected to the oil pipe of the oil tree of the oil well to detect the pressure of the oil pipe, and the oil pressure sensor (63) is electrically connected to the controller (61); The pressure value detected by the oil pressure sensor (63) is the first threshold value.

10. The oil well dosing device according to any one of claims 1 to 9, characterized in that: The dosing tank (1) comprises a tank body (11), an outer shell (12) and a base (13); The tank body (11) is located inside the outer shell (12) and is connected to the inner wall of the outer shell (12); a dosing hole (110) is provided on the top of the tank body (11), and the dosing hole (110) is communicated with the outside of the outer shell (12); The base (13) is located outside the outer shell (12) and at one side of the bottom of the tank body (11), and the base (13) is connected to the outer shell (12).

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