An oil-water well anti-freezing and plugging casing valve

Abstract

The utility model provides a kind of oil-water well anti-freezing and blocking casing valve.It mainly solves the problems of existing casing valve, such as valve cannot be opened, channel icing casing pressure cannot be recorded and valve body is frozen and cracked due to freezing and blocking in connection channel of casing valve.The casing valve comprises a valve body (9), a valve inlet (21) and a valve outlet (19) are arranged on the valve body (9), a conical valve core (14) is arranged in the valve body (9), the big end of the conical valve core (14) is located in the valve body (9), and the small end is located in the oil well casing channel after extending out of the valve inlet (21), and the right end of the conical valve core (14) is connected with a T-shaped push rod (18).The casing valve avoids the valve from being frozen and blocked, solves the problem of channel icing casing pressure, and avoids the valve body from being frozen and cracked due to water entering.

Description

Technical Field

[0001] This invention relates to the field of oilfield production engineering, specifically to a valve for preventing freezing and plugging casing in oil and water wells. Background Technology

[0002] Casing valves are indispensable components in the production tree process of oil and water wells. Oil and water well testing, well washing operations, chemical dosing and anti-waxing, and casing pressure data recording all require the use of casing valves. The antifreeze performance of these valves directly affects crude oil production. However, in cold regions during winter, freezing and cracking of oil and water well casing valves frequently occur, hindering operations. Currently, common methods include steam injection, hot water application, burning, or electric heating, which increase manpower and financial costs, pose environmental and safety hazards, and severely impact production efficiency. Existing antifreeze valves, even when opened, still fail to clear the passage due to freezing; the fluid pressure inside the casing cannot be directly measured, failing to meet the requirements of testing, well washing, and chemical dosing operations; and the valve body is prone to freezing and cracking after water ingress. Summary of the Invention

[0003] To overcome the problems of existing casing valves being unable to open due to freezing blockage at the connection channel with the casing, the inability to record casing pressure due to icing of the channel, and the freezing and cracking of the valve body due to water ingress, this invention provides an anti-freezing casing valve for oil and water wells. This anti-freezing casing valve for oil and water wells prevents the valve from being unable to open due to freezing blockage, solves the problem of the inability to record casing pressure due to icing of the channel, and prevents the valve body from freezing and cracking due to water ingress.

[0004] The technical solution of the present invention is: an antifreeze and plugging casing valve for oil and water wells, comprising a valve body, a valve inlet and a valve outlet on the valve body, a conical valve core inside the valve body, the large end of the conical valve core being located inside the valve body, and the small end extending outside the valve inlet and located inside the oil well casing channel, and a T-shaped push rod being connected to the right end of the conical valve core.

[0005] The conical valve core and T-shaped push rod are provided with a hydraulic channel inside. The left end of the conical valve core is provided with a pressure push plug, and the right end of the pressure push plug is provided with a pressure push plug return spring. The right end of the T-shaped push rod is connected to a pressure tapping connector.

[0006] The hydraulic channel contains alcohol or hydraulic oil.

[0007] The conical valve core has a valve body pressure cap on its right side, and the valve body pressure cap is threaded into the inside of the valve body.

[0008] The valve body cap is connected to a T-shaped push rod via a thread, and the right end of the T-shaped push rod (18) is provided with a T-shaped push rod drive cap.

[0009] A pressure release device is provided between the T-shaped push rod and the pressure tapping connector. The pressure release device is located inside the T-shaped push rod, and a pressure release device return spring is provided on the left side of the pressure release device. The pressure release device has a pressure release device hydraulic channel inside, and the pressure tapping connector has a pressure tapping connector hydraulic channel inside.

[0010] The right side wall of the pressure release device has a pressure release device side channel that communicates with the hydraulic channel of the pressure release device; the left side wall of the pressure tapping connector has a pressure tapping connector side channel that communicates with the hydraulic channel of the pressure tapping connector; when the pressure tapping connector is tightened, the hydraulic channel, the pressure release device hydraulic channel, the pressure release device side channel, the pressure tapping connector side channel, and the pressure tapping connector hydraulic channel are connected.

[0011] The right end of the pressure release device is provided with a pressure release cap, which is threaded into the inside of the T-shaped push rod.

[0012] The pressure release lever at the right end of the pressure release device is located inside the pressure release device cap, and the pressure tapping push rod at the left end of the pressure tapping connector is located inside the pressure release device cap, with the left end face of the pressure tapping push rod contacting the right end face of the pressure release lever.

[0013] The longitudinal section of the T-shaped push rod is T-shaped, and a T-shaped pressure cap is provided on the right side of the T-shaped plate of the T-shaped push rod, and the T-shaped pressure cap is threadedly connected to the inside of the conical valve core.

[0014] This invention offers the following advantages: Due to the aforementioned design, the conical valve core extends into the casing channel. When the valve is opened after freezing, the valve core is pulled out, and the ice forms a conical channel, solving the problem of the channel remaining blocked after the valve is opened due to freezing blockage at the casing connection. The hollow valve core houses an antifreeze pressure fluid channel to transmit pressure, preventing pressure loss due to freezing and ensuring uninterrupted pressure flow without heating. The closed inlet and open valve body structure solves the problem of water entering the casing valve body in winter, which can cause significant freezing and cracking. This antifreeze casing valve is suitable for installation on various types of oil and water well production tree casing valves. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an external view of the present invention; Figure 3 This is a schematic diagram of a pressure relief device; Figure 4 This is a schematic diagram of the pressure tapping connector.

[0016] In the diagram, 1-pressure tapping connector, 2-pressure tapping connector hydraulic channel, 3-T-shaped push rod drive cap, 4-pressure tapping push rod, 5-push rod sealing ring, 6-pressure release device push rod, 7-pressure release device cap, 8-pressure release device, 9-valve body, 10-pressure release device hydraulic channel, 11-pressure release device return spring, 12-valve body cap, 13-hydraulic channel, 14-conical valve core, 15-valve connecting flange, 16-valve core pressure guide tube, 17-T-shaped disc cap, 18-T-shaped push rod, 19-valve outlet, 20-valve outlet connecting pipe, 21-valve inlet, 22-pressure push plug return spring, 23-pressure push plug, 24-limiting snap ring, 2-1-pressure tapping connector side channel, 10-1-pressure release device side channel. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings: Depend on Figures 1 to 4 As shown, an antifreeze casing valve for oil and water wells includes a valve body 9, with a valve inlet 21 and a valve outlet 19. A valve outlet connector 20 is located at the valve outlet 19, and the valve outlet connector 20 is threadedly connected to a pipeline. The valve outlet connector 20 and the valve body 9 can be connected at various angles. A valve connecting flange 15 is provided at the valve inlet on the valve body 9. A conical valve core 14 is located inside the valve body 9. The left end of the conical valve core 14 is a small end, and the right end is a large end. The large end is located inside the valve body 9, and the small end is located outside the valve inlet 21, situated inside the oilfield casing passage. When the conical valve core 14 moves to the left, the cone engages with the valve inlet 21, closing the valve inlet 21; when the conical valve core 14 moves to the right, the valve inlet 21 is opened, allowing communication between the valve inlet 21 and the valve outlet 19. The conical structure of the valve core prevents the valve inlet 21 from becoming blocked due to the presence of the valve core. In this case, simply moving the valve core to the right will open the valve inlet 21, thus preventing the valve from freezing.

[0018] The conical valve core 14 has a valve body cap 12 on its right side, which is threaded into the valve body 9. A T-shaped push rod 18 is connected to the right end of the conical valve core 14. The T-shaped push rod 18 has a T-shaped longitudinal section, with a T-shaped disc on the left and a central push rod on the right. A T-shaped disc cap 17 is located on the right side of the T-shaped disc and is threaded into the conical valve core 14. A T-shaped push rod drive cap 3 is located at the right end of the T-shaped push rod 18. The external cross-section of the T-shaped push rod drive cap 3 is square or hexagonal for easy rotation with a wrench. The push rod at the right end of the T-shaped push rod 18 is connected to the valve body cap 12 via a T-shaped thread. Thus, rotating the T-shaped push rod drive cap 3 with a wrench moves the T-shaped push rod 18 back and forth relative to the valve body cap 12, thereby pushing the conical valve core 14 back and forth, thus closing or opening the valve inlet 21.

[0019] The conical valve core 14 and T-shaped push rod 18 are internally equipped with a hydraulic channel 13, which contains an antifreeze liquid such as alcohol or hydraulic oil to prevent freezing in winter. A pressure plug 23 is located at the left end of the conical valve core 14, and a retaining spring 24 is located at the left end of the pressure plug 23 to prevent it from falling out. A valve core pressure conduit 16 is formed inside the conical valve core 14 to the left of the pressure plug 23, through which hydraulic pressure enters the valve core. A pressure plug return spring 22 is located at the right end of the pressure plug 23, and the right end of the pressure plug return spring 22 contacts the stepped surface inside the conical valve core 14.

[0020] The right end of the internal hydraulic channel 13 of the T-shaped push rod 18 is a pressure relief chamber. The inner diameter of the pressure relief chamber is larger than that of the hydraulic channel 13. From left to right, the pressure relief chamber contains a pressure relief return spring 11, a pressure relief device 8, and a pressure relief cap 7. The pressure relief cap 7 is threadedly connected to the inside of the T-shaped push rod 18. The right end of the pressure relief device 8 is a pressure relief push rod 6, located inside the pressure relief cap 7. The right end of the pressure relief device 8 has a pressure tapping connector 1, and the left end of the pressure tapping connector 1 is a pressure tapping push rod 4, located inside the pressure relief cap 7. A push rod sealing ring 5 is provided between the pressure tapping push rod 4 and the pressure relief cap 7, and the left end face of the pressure tapping push rod 4 contacts the right end face of the pressure relief push rod 6. The pressure release device 8 has a hydraulic channel 10 inside, the front end of which is closed. The hydraulic channel 10 communicates with the outside of the side wall of the pressure release device 8 through a lateral pressure release side channel 10-1. The pressure tapping connector 1 has a hydraulic channel 2 inside, and a lateral pressure tapping connector side channel 2-1 is opened on the pressure tapping connector 1, which connects the hydraulic channel 2 to the outside of the pressure tapping connector 1. When the valve is working normally, the pressure relief valve push rod 6 is located inside the pressure relief valve cap 7, which closes the pressure relief valve side passage 10-1. When pressure needs to be taken, tighten the pressure taking connector 1 forward, and the pressure taking push rod 4 pushes the pressure relief valve 8 forward, so that the pressure relief valve side passage 10-1 is disengaged from the pressure relief valve cap 7, thereby connecting the hydraulic passage 13, the hydraulic passage 10 of the pressure relief valve, the pressure relief valve side passage 10-1, the pressure taking connector side passage 2-1, and the pressure taking connector hydraulic passage 2, thereby opening the pressure relief valve to take pressure.

[0021] The anti-freezing casing valve for oil and water wells works in conjunction with the valve inlet 21 via a conical valve core 14. This prevents freezing at the conical valve core 14 and, if freezing occurs at the valve inlet 21, the valve core can be moved back and forth to unclog it. For testing, well cleaning, or chemical dosing, simply rotate the T-shaped push rod drive cap 3 to open the conical valve core 14. When casing pressure needs to be recorded, install the pressure gauge or pressure transmitter directly on the pressure tapping connector 1. Rotating the connector causes the left end face of the pressure tapping push rod 4 to press against the right end face of the pressure release lever 6 under the action of the threads, pushing the pressure release lever 8 to move. This connects the hydraulic channel 2 and hydraulic channel 13 of the pressure tapping connector, allowing liquid to enter and display the pressure on the gauge. After measuring the pressure, rotate the pressure tapping connector 1 in the opposite direction. The pressure release lever 8, pushed by the pressure release lever return spring 11, closes the hydraulic channel 2 of the pressure tapping connector. After the operation, the pressure gauge can be removed or retained.

Claims

1. A valve for preventing freezing and plugging casing in oil and water wells, comprising a valve body (9), wherein the valve body (9) is provided with a valve inlet (21) and a valve outlet (19), characterized in that: The valve body (9) is provided with a conical valve core (14). The large end of the conical valve core (14) is located inside the valve body (9), and the small end extends out of the valve inlet (21) and is located inside the well casing channel. The right end of the conical valve core (14) is connected to a T-shaped push rod (18). The conical valve core (14) and the T-shaped push rod (18) are provided with a hydraulic channel (13). The left end of the conical valve core (14) is provided with a pressure push plug (23), and the right end of the pressure push plug (23) is provided with a pressure push plug return spring (22). The right end of the T-shaped push rod (18) is connected to a pressure tapping connector (1). The conical valve core (14) is provided with a valve body pressure cap (12) on the right side, and the valve body pressure cap (12) is threadedly connected to the inside of the valve body (9); the valve body pressure cap (12) is threadedly connected to a T-shaped push rod (18), and the right end of the T-shaped push rod (18) is provided with a T-shaped push rod drive cap (3). A pressure release device (8) is provided between the T-shaped push rod (18) and the pressure tapping connector (1). The pressure release device (8) is located inside the T-shaped push rod (18), and a pressure release device reset spring (11) is provided on the left side of the pressure release device (8). A pressure release device hydraulic channel (10) is provided inside the pressure release device (8), and a pressure tapping connector hydraulic channel (2) is provided inside the pressure tapping connector (1). The pressure release device (8) has a pressure release device side channel (10-1) on its right side wall that communicates with the pressure release device hydraulic channel (10); the pressure tapping connector (1) has a pressure tapping connector side channel (2-1) on its left side wall that communicates with the pressure tapping connector hydraulic channel (2); when the pressure tapping connector (1) is tightened, the hydraulic channel (13), the pressure release device hydraulic channel (10), the pressure release device side channel (10-1), the pressure tapping connector side channel (2-1), and the pressure tapping connector hydraulic channel (2) are connected; The right end of the pressure release device (8) is provided with a pressure release cap (7), which is connected to the inside of the T-shaped push rod (18) by a thread.

2. The antifreeze plugging valve for oil and water wells according to claim 1, characterized in that: The hydraulic channel (13) contains alcohol or hydraulic oil.

3. The antifreeze plugging valve for oil and water wells according to claim 1, characterized in that: The pressure release lever (6) at the right end of the pressure release device (8) is located inside the pressure release cap (7), and the pressure tapping push rod (4) at the left end of the pressure tapping connector (1) is located inside the pressure release cap (7), and the left end face of the pressure tapping push rod (4) is in contact with the right end face of the pressure release lever (6).

4. The oil and water well antifreeze plugging casing valve according to claim 3, characterized in that: The T-shaped push rod (18) has a T-shaped longitudinal section. The right side of the T-shaped push rod (18) is provided with a T-shaped pressure cap (17), and the T-shaped pressure cap (17) is threaded into the inside of the conical valve core (14).

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