Automatic water mixing and chemical adding device for well sealing

Abstract

The utility model discloses an oil well sealing automatic water mixing and dosing device, including water tank, be used for putting non -inflammable and explosive reagent's 1# dosing tank, be used for putting 2# dosing tank of inflammable and explosive reagent, water tank is connected to the 1# import of three -way valve through the pipeline with water tank valve, 1# dosing tank is connected to the 2# import of three -way valve through the pipeline with 1# dosing tank valve, three -way valve can switch 1# import or 2# import and put into work, three -way valve export is connected to the booster pump import through the pipeline, and the booster pump export is connected to the oil well wellhead casing through the main pipeline with main valve and 1# check valve, and 1# check valve is close to the oil well wellhead casing compared with main valve, and the main valve is connected to the oil well wellhead casing through the main pipeline with bypass valve and injector, and 2# dosing tank is connected to the suction end of injector through the pipeline with 2# check valve. The device can mix water and dose to the oil well wellhead casing and put inflammable and explosive reagent when sealing production.

Description

Technical Field

[0001] This utility model belongs to the field of oil well production in petroleum extraction, and specifically relates to a closed automatic water-addition and chemical dosing device for oil wells. Background Technology

[0002] In oilfield well production, open-casing production was previously used, where the gas pressure inside the casing was balanced with atmospheric pressure. Under normal pressure, water and chemicals were introduced into the wellbore from the wellhead casing. However, with increasingly stringent environmental protection requirements, the open-casing production model can no longer meet these requirements, making closed-loop production an inevitable trend.

[0003] After the well is sealed for production, the pressure inside the casing gradually rises due to the continuous generation of casing gas, far exceeding the atmospheric pressure at the wellhead. Water and chemicals cannot enter the wellhead casing due to gravity. At this point, the casing gas at the wellhead must be vented, which not only poses safety risks and wastes resources but also increases workload and has a significant impact on well production. Utility Model Content

[0004] The purpose of this utility model is to provide an automatic water and chemical dosing device for closed oil wells. This device can smoothly add water and chemicals to the wellhead casing during closed production and can also add flammable and explosive agents.

[0005] The technical solution adopted in this utility model is:

[0006] An automatic water-injection and chemical dosing device for oil wells includes a water tank, a No. 1 dosing tank for dispensing non-flammable and non-explosive chemicals, and a No. 2 dosing tank for dispensing flammable and explosive chemicals. The water tank is connected to the No. 1 inlet of a three-way valve via a pipeline with a water tank valve. The No. 1 dosing tank is connected to the No. 2 inlet of the three-way valve via a pipeline with a No. 1 dosing tank valve. The three-way valve can switch between No. 1 and No. 2 inlets for operation. The outlet of the three-way valve is connected to the inlet of a booster pump via a pipeline. The outlet of the booster pump is connected to the wellhead casing of the oil well via a main pipeline with a main valve and a No. 1 check valve. The No. 1 check valve is closer to the wellhead casing than the main valve. A bypass pipeline with a bypass valve and an ejector is connected in parallel to the main valve. The No. 2 dosing tank is connected to the suction end of the ejector via a pipeline with a No. 2 check valve.

[0007] Preferably, it also includes a controller, which is electrically connected to the booster pump, the water tank valve, the No. 1 dosing tank valve, and the three-way valve.

[0008] Preferably, it also includes a flow sensor, which is located on the pipeline between the outlet of the three-way valve and the inlet of the booster pump and is used to detect the flow rate at the location. The controller is electrically connected to the flow sensor.

[0009] Preferably, it also includes a liquid level sensor, which is installed on the No. 1 dosing tank and used to detect the liquid level in the No. 1 dosing tank. The controller is electrically connected to the liquid level sensor.

[0010] Preferably, it also includes a touch screen capable of human-computer interaction, and the controller is electrically connected to the touch screen.

[0011] Preferably, the controller, touch screen, booster pump, and three-way valve are integrated and installed on the electrical cabinet. The controller is installed inside the upper layer of the electrical cabinet, the touch screen is installed outside the upper layer of the electrical cabinet, and the booster pump and three-way valve are installed inside the lower layer of the electrical cabinet.

[0012] Preferably, the electrical cabinet is equipped with an input interface for a three-way valve, an output interface for a booster pump, and an external interface for a controller.

[0013] Preferably, the water tank valve, the No. 1 dosing tank valve, and the main valve are all normally open valves, while the bypass valve is a normally closed valve.

[0014] Preferably, the booster pump is a high-pressure diaphragm pump.

[0015] Preferably, the water tank is installed on a base foundation next to the wellhead support of the oil pumping unit.

[0016] The beneficial effects of this utility model are:

[0017] This device can smoothly add water and chemicals to the wellhead casing during closed production, and can also add flammable and explosive agents: When normal water addition is required, the booster pump is turned on, the water tank valve is opened, the three-way valve switches to inlet #1 for operation, the main valve is opened, and the bypass valve is closed. The water in the tank is pressurized by the booster pump and then transported to the wellhead casing. When non-flammable and non-explosive ordinary agents need to be added, the ordinary agent is added to the #1 dosing tank, the booster pump is turned on, the #1 dosing tank valve is opened, the three-way valve switches to inlet #2 for operation, the main valve is opened, and the bypass valve is closed. With the main valve closed, the ordinary chemicals in the No. 1 dosing tank are pressurized by the booster pump and delivered to the wellhead casing. When flammable and explosive chemicals need to be added, they are added to the No. 2 dosing tank. The booster pump is turned on, the water tank valve is opened, the three-way valve switches the No. 1 inlet to operation, the main valve is closed, and the bypass valve is opened. The water in the tank is pressurized by the booster pump and delivered to the ejector. The ejector's suction end generates negative pressure, drawing the flammable and explosive chemicals from the No. 2 dosing tank into the ejector. Then, the water carrying the flammable and explosive chemicals is delivered to the wellhead casing. The booster pump pressurizes the water and chemicals being transported, overcoming the internal pressure of the wellhead casing and allowing them to be smoothly delivered into the wellhead casing. The jet injector uses negative pressure to draw in flammable and explosive chemicals and carries them in water, enabling the safe delivery of these chemicals. The #1 check valve prevents backflow from the wellhead casing to the main pipeline, and the #2 check valve prevents backflow of flammable and explosive chemicals, thus providing a safety function. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the closed automatic water and chemical dosing device for oil wells in Embodiment 1 of this utility model.

[0020] Figure 2 This is a schematic diagram of the closed automatic water and chemical dosing device for oil wells in Embodiment 2 of this utility model.

[0021] Figure 3 This is a schematic diagram of the closed automatic water and chemical dosing device for oil wells in Embodiment 3 of this utility model.

[0022] Figure 4 This is a schematic diagram of the closed automatic water and chemical dosing device for oil wells in Embodiment 4 of this utility model.

[0023] In the diagram: 1-Water tank; 2-Dosing tank #1; 3-Dosing tank #1 valve; 4-Water tank valve; 5-Three-way valve; 6-Booster pump; 7-Main valve; 8-Check valve #1; 9-Wellhead casing; 10-Bypass valve; 11-Ejector; 12-Check valve #2; 13-Dosing tank #2; 14-Controller; 15-Touch screen; 16-Level sensor; 17-Flow sensor; 18-Electrical cabinet. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "1# dosing tank," "2# dosing tank," "1# dosing tank valve," "1# check valve," "2# check valve," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0027] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] The features and performance of this application will be further described in detail below with reference to the embodiments.

[0029] Example 1

[0030] This embodiment discloses a closed-loop automatic water-injection and chemical dosing device for oil wells, such as... Figure 1 As shown, the system includes a water tank 1, a water tank valve 4, a #1 dosing tank 2, a #1 dosing tank valve 3, a #2 dosing tank 13, a three-way valve 5, a booster pump 6, a main valve 7, a #1 check valve 8, a bypass valve 10, an ejector 11, and a #2 check valve 12. Specifically: the water tank 1 is connected to the #1 inlet of the three-way valve 5 via a pipeline with the water tank valve 4; the #1 dosing tank 2 is used to dispense non-flammable and non-explosive agents, and is connected to the #2 inlet of the three-way valve 5 via a pipeline with the #1 dosing tank valve 3; the three-way valve 5 can switch... When either inlet #1 or inlet #2 is put into operation, the outlet of the three-way valve 5 is connected to the inlet of the booster pump 6 via a pipeline. The outlet of the booster pump 6 is connected to the wellhead casing 9 via a main pipeline with a main valve 7 and a check valve #1 8. Check valve #1 8 is closer to the wellhead casing 9 than the main valve 7. A bypass pipeline with a bypass valve 10 and an ejector 11 is connected in parallel to the main valve 7. The chemical dosing tank #2 is used to dispense flammable and explosive agents. The chemical dosing tank #2 is connected to the suction end of the ejector 11 via a pipeline with a check valve #2 12.

[0031] This device can smoothly add water and chemicals to the wellhead casing 9 during closed production, and can also release flammable and explosive agents.

[0032] When normal water mixing is required, booster pump 6 is turned on, water tank valve 4 is opened, three-way valve 5 is switched to inlet #1 for operation, main valve 7 is opened, bypass valve 10 is closed, and water in water tank 1 is pressurized by booster pump 6 and then transported to wellhead casing 9 of oil well.

[0033] When it is necessary to add non-flammable and non-explosive ordinary agents, add the ordinary agents to the No. 1 dosing tank 2, turn on the booster pump 6, open the valve 3 of the No. 1 dosing tank, switch the No. 2 inlet to the working position with the three-way valve 5, open the main valve 7, close the bypass valve 10, and the ordinary agents in the No. 1 dosing tank 2 are pressurized by the booster pump 6 and then transported to the wellhead casing 9 of the oil well.

[0034] When flammable and explosive agents need to be added, the flammable and explosive agents are added to the No. 2 dosing tank 13, the booster pump 6 is turned on, the water tank valve 4 is opened, the three-way valve 5 is switched to the No. 1 inlet to start working, the main valve 7 is closed, and the bypass valve 10 is opened. The water in the water tank 1 is pressurized by the booster pump 6 and then sent to the ejector 11. The suction end of the ejector 11 generates negative pressure to draw the flammable and explosive agents in the No. 2 dosing tank 13 into the ejector 11. Then the water carries the flammable and explosive agents together to the wellhead casing 9 of the oil well.

[0035] Among them: the booster pump 6 can pressurize the water and chemicals being transported, thereby overcoming the internal pressure of the wellhead casing 9 and smoothly inputting it into the wellhead casing 9; the jet injector 11 can draw flammable and explosive chemicals with negative pressure and carry them with water, thus safely delivering flammable and explosive chemicals; the #1 check valve 8 can prevent backflow from the wellhead casing 9 to the main pipeline, and the #2 check valve 12 can prevent backflow of flammable and explosive chemicals, thus playing a safety role.

[0036] In this embodiment, the water tank valve 4, the No. 1 dosing tank valve 3, and the main valve 7 are all normally open valves, while the bypass valve 10 is a normally closed valve, which can avoid frequent valve operation.

[0037] In this embodiment, the booster pump 6 is a high-pressure diaphragm pump (voltage 24 volts, head 110 meters, displacement 6 liters / minute).

[0038] In this embodiment, the water tank 1 is installed on the base foundation next to the wellhead support of the oil pumping unit.

[0039] Example 2

[0040] This embodiment discloses a second type of closed-loop automatic water-injection and chemical dosing device for oil wells, such as... Figure 2 As shown, the difference between this and Embodiment 1 is that it also includes a controller 14, which is electrically connected to the booster pump 6, the water tank valve 4, the No. 1 dosing tank valve 3, and the three-way valve 5.

[0041] In this embodiment, the addition of controller 14 can play the role of automatic control. Controller 14 can control the actions of each actuator according to the instructions to realize the automatic control of normal water mixing and the automatic control of ordinary chemical dosing.

[0042] Because the process of adding flammable and explosive agents is dangerous, it is not automated but manually controlled: when adding flammable and explosive agents, the liquid level and status of the No. 2 dosing tank are observed manually, and the opening and closing of the main valve and bypass valve are controlled manually.

[0043] Example 3

[0044] This embodiment discloses a third type of closed-loop automatic water-injection and chemical dosing device for oil wells, such as... Figure 3 As shown, the difference between it and Example 2 is:

[0045] 1) It also includes a flow sensor 17, which is installed on the pipeline between the outlet of the three-way valve 5 and the inlet of the booster pump 6 and is used to detect the flow rate at the location. The controller 14 is electrically connected to the flow sensor 17. The addition of the flow sensor 17 can maintain a uniform flow rate during normal water mixing: During normal water mixing, the controller 14 controls the corresponding actuators to operate, so that the water in the water tank 1 is pressurized by the booster pump 6 and delivered to the wellhead casing 9. Furthermore, the controller controls the opening of the water tank valve 4 based on the feedback from the flow sensor 17, so that the water is evenly mixed into the wellhead casing 9.

[0046] 2) It also includes a liquid level sensor 16, which is installed on the No. 1 dosing tank 2 and used to detect the liquid level in the No. 1 dosing tank 2. The controller 14 is electrically connected to the liquid level sensor 16. The addition of the liquid level sensor 16 can achieve automatic start and stop control when ordinary agents are added: when ordinary agents are added, when the liquid level fed back by the liquid level sensor 16 reaches the set value, the controller 14 controls the corresponding actuators to act, so that the ordinary agent in the No. 1 dosing tank 2 is pressurized by the booster pump 6 and delivered to the wellhead casing 9 of the oil well. Until the liquid level fed back by the liquid level sensor 16 is lower than a certain value, the controller 14 controls the corresponding actuators to act, stops the delivery of ordinary agents to the wellhead casing 9 of the oil well, and switches to the normal water injection program.

[0047] 3) It also includes a touch screen 15 for human-machine interaction, and the controller 14 is electrically connected to the touch screen 15. The addition of the touch screen 15 allows for convenient adjustment of the device's working mode and parameters through human-machine interaction: the device's working mode (normal water mixing, ordinary reagent dosing) can be selected through the touch screen, and the working parameters can also be adjusted. For example, in the normal water mixing mode, the total daily water mixing amount, the time of each water mixing, and the water mixing interval can be selected to achieve quantitative water mixing and timed water seepage. In the ordinary reagent dosing mode, the amount of ordinary reagent to be added, the number of additions, and the dosing interval can be selected.

[0048] Example 4

[0049] This embodiment discloses a fourth type of closed-loop automatic water-injection and chemical dosing device for oil wells, such as... Figure 4As shown, the difference between this embodiment and Embodiment 3 is that the controller 14, touch screen 15, booster pump 6 and three-way valve 5 are integrated and installed on the electrical cabinet 18. The controller 14 is installed inside the upper layer of the electrical cabinet 18, the touch screen 15 is installed outside the upper layer of the electrical cabinet 18, and the booster pump 6 and three-way valve 5 are installed inside the lower layer of the electrical cabinet 18.

[0050] Integrating key electrical equipment into the electrical cabinet 18 can protect the key electrical equipment and facilitate the assembly of the device. The controller 14 and touch screen 15 are separated from the booster pump 6 and the three-way valve 5, which can prevent the controller 14 and touch screen 15 from being exposed to the heat radiation of the booster pump 6, and also prevent the controller 14 and touch screen 15 from getting wet when the booster pump 6 is being repaired.

[0051] In this embodiment, the electrical cabinet 18 is equipped with an input interface for the three-way valve 5, an output interface for the booster pump 6, and an external interface for the controller 14; the device is designed as a modular structure, which facilitates connection of pipelines and data cables and makes assembly convenient.

[0052] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A closed-loop automatic water-injection and chemical dosing device for oil wells, characterized in that: The system includes a water tank, a No. 1 dosing tank for non-flammable and explosive agents, and a No. 2 dosing tank for flammable and explosive agents. The water tank is connected to the No. 1 inlet of a three-way valve via a pipeline with a water tank valve. The No. 1 dosing tank is connected to the No. 2 inlet of the three-way valve via a pipeline with a No. 1 dosing tank valve. The three-way valve can switch between the No. 1 and No. 2 inlets for operation. The outlet of the three-way valve is connected to the inlet of a booster pump via a pipeline. The outlet of the booster pump is connected to the wellhead casing via a main pipeline with a main valve and a No. 1 check valve. The No. 1 check valve is closer to the wellhead casing than the main valve. A bypass pipeline with a bypass valve and an ejector is connected in parallel to the main valve. The No. 2 dosing tank is connected to the suction end of the ejector via a pipeline with a No. 2 check valve.

2. The closed-loop automatic water-injection and chemical dosing device for oil wells as described in claim 1, characterized in that: It also includes a controller, which is electrically connected to the booster pump, water tank valve, No. 1 dosing tank valve and three-way valve respectively.

3. The closed-loop automatic water-injection and chemical dosing device for oil wells as described in claim 2, characterized in that: It also includes a flow sensor, which is installed on the pipeline between the outlet of the three-way valve and the inlet of the booster pump and is used to detect the flow at that location. The controller is electrically connected to the flow sensor.

4. The closed-loop automatic water-injection and chemical dosing device for oil wells as described in claim 2, characterized in that: It also includes a liquid level sensor, which is installed on the No. 1 dosing tank and used to detect the liquid level in the No. 1 dosing tank. The controller is electrically connected to the liquid level sensor.

5. The closed-loop automatic water-injection and chemical dosing device for oil wells as described in claim 2, characterized in that: It also includes a touchscreen that enables human-computer interaction, and the controller is electrically connected to the touchscreen.

6. The closed-loop automatic water-injection and chemical dosing device for oil wells as described in claim 5, characterized in that: The controller, touch screen, booster pump, and three-way valve are integrated and installed on the electrical cabinet. The controller is installed inside the upper layer of the electrical cabinet, the touch screen is installed outside the upper layer of the electrical cabinet, and the booster pump and three-way valve are installed inside the lower layer of the electrical cabinet.

7. The closed-loop automatic water-injection and chemical dosing device for oil wells as described in claim 6, characterized in that: The electrical cabinet is equipped with an input interface for a three-way valve, an output interface for a booster pump, and an external interface for a controller.

8. The closed-loop automatic water-injection and chemical dosing device for oil wells as described in claim 1, characterized in that: The water tank valve, the No. 1 dosing tank valve, and the main valve are all normally open valves, while the bypass valve is a normally closed valve.

9. The closed-loop automatic water-injection and chemical dosing device for oil wells as described in claim 1, characterized in that: The booster pump is a high-pressure diaphragm pump.

10. The closed-loop automatic water-injection and chemical dosing device for oil wells as described in claim 1, characterized in that: The water tank is installed on a base foundation next to the wellhead support of the oil pumping unit.

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