Anti-clogging pressure control throttle valve

Abstract

The utility model discloses a kind of anti-clogging pressure control throttling valves, belong to the field of throttling valve, including valve body, the inside of valve body is cross cavity structure, the left and right sides of transverse direction of cross cavity structure are respectively provided with mutually matched valve cover and valve seat, the valve core of being slidably arranged is provided in the valve cover, oil cylinder assembly is provided on the left side position of the valve cover, the valve core is connected together with the telescopic end of the oil cylinder assembly, oil cylinder assembly drives valve core left and right sliding adjustment valve opening degree;The upper side position of the vertical direction of cross cavity structure is provided with blowdown flange, the lower side position of the vertical direction of cross cavity structure is provided with flush hole on outer wall.The anti-clogging pressure control throttling valve structure of this full utility model is more reasonable in design, convenient to maintain, avoids the safety risk of equipment shutdown and wellbore pressure dramatic increase caused by throttling valve blockage.

Description

Technical Field

[0001] This utility model relates to the field of throttle valves, and in particular to an anti-clogging pressure-controlled throttle valve. Background Technology

[0002] Pressure-controlled throttle valves are core equipment for pressure control in underbalanced pressure controlled drilling operations in oil extraction. Currently, most pressure-controlled throttle valves adopt a cylindrical structure, while some users use wedge-shaped, orifice-plate, and other structural types.

[0003] Existing cylindrical throttle valves are widely used in controlled pressure drilling operations. However, when encountering large-particle mud, their poor media flowability easily leads to valve cavity blockage during prolonged operation, causing equipment downtime and severely impacting the drilling process. Wedge-shaped throttle valves and orifice plate throttle valves have approximately semi-circular flow orifices with asymmetrical flow channel structures, making them even more prone to blockage in controlled pressure drilling operations; blockage can occur even in short periods of operation. Therefore, this invention proposes an anti-clogging controlled pressure throttle valve. Utility Model Content

[0004] The purpose of this invention is to provide an anti-clogging pressure-controlled throttle valve to solve the problems mentioned above.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This utility model discloses an anti-clogging pressure control throttle valve, comprising a valve body with an internal cross-shaped cavity structure. A matching valve cover and valve seat are respectively arranged on the left and right sides of the cross-shaped cavity structure in the lateral direction. A slidable valve core is disposed inside the valve cover. A hydraulic cylinder assembly is disposed on the left side of the valve cover. The valve core is connected to the telescopic end of the hydraulic cylinder assembly, and the hydraulic cylinder assembly drives the valve core to slide left and right to adjust the valve opening. A drain flange is disposed on the upper side of the cross-shaped cavity structure in the vertical direction, and a flushing hole is provided on the outer wall of the lower side of the cross-shaped cavity structure in the vertical direction.

[0007] Furthermore, a buffer chamber is formed between the upper part of the drain flange and the cross cavity structure of the valve body.

[0008] Furthermore, a one-way injection valve is provided on the flushing hole.

[0009] Furthermore, the outer wall end of the valve core is provided with a fluid guiding angle of 1.

[0010] Furthermore, the inner wall end of the valve seat is provided with a fluid guiding angle of 2.

[0011] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0012] This utility model of an anti-clogging pressure-controlled throttle valve features an added drain flange and flushing hole, with a buffer chamber between the drain flange and the valve body. This buffer chamber helps to mitigate the rapid increase in particles within the valve cavity. After a certain operating cycle, the drain flange can be opened online, and water can be injected through the flushing hole to flush out oversized rock debris particles from the valve cavity. Both the valve core and valve seat are equipped with fluid guide angles to ensure good flow characteristics during valve operation. In summary, this utility model of an anti-clogging pressure-controlled throttle valve has a more rational structural design, is easier to maintain, and avoids the safety risks of equipment downtime and a surge in wellbore pressure caused by throttle valve blockage. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 This is a cross-sectional view of the anti-clogging pressure control throttle valve of this utility model;

[0015] Figure 2 A structural diagram of the fluid guiding angle;

[0016] Figure 3 The structure diagram shows the fluid guiding angle.

[0017] Explanation of reference numerals in the attached drawings: 1. Hydraulic cylinder assembly; 2. Valve cover; 3. Drain flange; 4. Valve body; 5. Valve core; 6. Buffer chamber; 7. Valve seat; 8. Flushing hole; 9. One-way injection valve; 10. Fluid guide angle one; 11. Fluid guide angle two. Detailed Implementation

[0018] like Figure 1-3 As shown, an anti-clogging pressure-controlled throttling valve includes a valve body 4. The valve body 4 has an internal cross-shaped cavity structure. A matching valve cover 2 and valve seat 7 are respectively installed on the left and right sides of the cross-shaped cavity structure in the lateral direction. A slidable valve core 5 is installed inside the valve cover 2. A hydraulic cylinder assembly 1 is installed on the left side of the valve cover 2. The valve core 5 is connected to the telescopic end of the hydraulic cylinder assembly 1. The hydraulic cylinder assembly 1 drives the valve core 5 to slide left and right, thereby adjusting the valve opening. The valve inlet and outlet diameters and the through-hole size of the valve core 5 are not less than 3 inches. The entire flow channel is designed with smooth transitions to ensure the smooth passage of large particles of mud.

[0019] The valve core 5 has a fluid guide angle of 10 on its outer side wall end and a fluid guide angle of 11 on its inner side wall end, which makes the flow characteristic curve of the valve closer to linear and improves the stability of pressure regulation in underbalanced pressure control operation.

[0020] A drain flange 3 is installed on the upper vertical side of the cross-shaped cavity structure, and a flushing hole 8 is provided on the outer wall of the lower vertical side of the cross-shaped cavity structure. A buffer chamber 6 is formed between the drain flange 3 and the upper part of the cross-shaped cavity structure of the valve body 4, which can alleviate the rapid increase of particles in the valve cavity. A one-way injection valve 9 is installed on the flushing hole 8.

[0021] The working process of this utility model is as follows:

[0022] The choke valve is installed in the choke manifold and connected to the wellbore via the internal control line and drilling four-way valve. Initially, the choke valve is half-open. During pressure control operations, the opening of the choke valve can be adjusted according to the balance between the bottom hole pressure and the wellhead pressure (by moving the valve core 5 through the hydraulic cylinder assembly 1). When the wellhead pressure increases abnormally, it can be determined that the choke valve is blocked. At this time, the valve opening can be increased, or even adjusted to the fully open state. When the wellhead pressure approaches the predetermined pressure, the choke valve is reset to its original opening size to re-establish the pressure balance relationship of the wellbore medium and restore the normal pressure control drilling operation procedure.

[0023] After a certain operating cycle, some oversized rock debris will inevitably remain in the valve cavity. At this time, a spare throttle valve can be used for operation. Close the upstream and downstream gate valves of the throttle valve to be maintained, open the drain flange 3, connect the valve inlet flushing hole 8 and the one-way injection valve 9 to the flushing pipe, inject clean water to clean the valve cavity, and then assemble and test the whole machine after cleaning.

[0024] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A choke valve with anti-clogging pressure control, characterized in that: The valve body (4) has a cross-shaped cavity structure inside. On the left and right sides of the cross-shaped cavity structure, there are matching valve covers (2) and valve seats (7). A slidable valve core (5) is provided inside the valve cover (2). A hydraulic cylinder assembly (1) is provided on the left side of the valve cover (2). The valve core (5) is connected to the telescopic end of the hydraulic cylinder assembly (1). The hydraulic cylinder assembly (1) drives the valve core (5) to slide left and right to adjust the valve opening. A drain flange (3) is provided on the upper side of the cross-shaped cavity structure in the vertical direction. A flushing hole (8) is provided on the outer wall of the lower side of the cross-shaped cavity structure in the vertical direction.

2. The anti-clogging pressure-controlled throttling valve according to claim 1, characterized in that: A buffer chamber (6) is formed between the upper part of the cross cavity structure of the drain flange (3) and the valve body (4).

3. The anti-clogging pressure-controlled throttle valve according to claim 1, characterized in that: A one-way injection valve (9) is provided on the flushing hole (8).

4. The anti-clogging pressure-controlled throttle valve according to claim 1, characterized in that: The valve core (5) has a fluid guide angle (10) at the end of its outer wall.

5. The anti-clogging pressure-controlled throttle valve according to claim 1, characterized in that: The valve seat (7) has a fluid guide angle 2 (11) at the end of its inner wall.

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