Pressure-controlled circulating valve

Abstract

The utility model provides a pressure control type circulating valve, which belongs to the field of conventional oil and gas well fracturing test combined process, and comprises a mandrel, an upper joint, a rupture disk outer cylinder and a lower joint, the upper joint is tubular, a first pipe for inserting an upper tool is formed at the upper part of the upper joint, a second pipe is formed at the lower part of the upper joint, and the upper part of the mandrel is inserted into the second pipe in a sliding manner; the first pipe is communicated with the second pipe through the third pipe, the inner diameter of the third pipe is equal to that of the mandrel, the inner diameter of the first pipe is larger than that of the third pipe, the inner diameter design guarantees smoothness of fluid in the flowing process, and pressure loss is reduced. The slope surface is formed at the joint of the first pipe and the third pipe and can effectively guide the flowing direction of fluid, resistance and erosion of the fluid in the flowing process are reduced, particularly under the high sand amount working conditions such as sand fracturing and the like, erosion of mud and sand to the upper connector can be effectively reduced, and the service life of the circulating valve is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of conventional oil and gas well fracturing test and operation technology, and more specifically, relates to a pressure-controlled circulation valve. Background Technology

[0002] Fracturing testing combined with other technologies and its application: Fracturing testing combined with other technologies is a highly efficient oil and gas well development technology that integrates multiple processes such as formation testing and fracturing stimulation into a single tubing run. By optimizing the process, it reduces construction time and costs while improving formation permeability and oil and gas production. This technology not only improves the efficiency of oil and gas exploration and development but also provides strong support for the economical and effective development of oil and gas fields.

[0003] Pressure-controlled circulation valves are a core component in fracturing testing and operation technology. They control the annular pressure to open and close the valve, thus achieving circulation and meeting various operational needs. During fracturing, the circulation valve controls the injection and discharge of fracturing fluid, ensuring the smooth progress of the fracturing operation. However, traditional pressure-controlled circulation valves have some limitations. Their upper connectors have a stepped structure, making them susceptible to erosion by mud and sand during proppant fracturing, leading to a reduced service life. This erosion not only affects the valve's sealing performance but can also cause it to jam or fail, posing safety hazards during operation. Utility Model Content

[0004] The purpose of this invention is to provide a pressure-controlled circulation valve that solves the problem that the upper connector of the existing pressure-controlled circulation valve is easily eroded by mud and sand.

[0005] To achieve the above objectives, this utility model provides a pressure-controlled circulation valve, comprising:

[0006] Mandrel, wherein the mandrel is tubular;

[0007] The upper connector is tubular, with a first tube formed at the top for inserting an upper tool and a second tube formed at the bottom. The upper part of the mandrel is slidably inserted into the second tube. The first tube and the second tube are connected by a third tube. The inner diameter of the third tube is equal to the inner diameter of the mandrel. The inner diameter of the first tube is larger than the inner diameter of the third tube. A slope is formed at the connection between the first tube and the third tube.

[0008] The outer cylinder of the rupture disc is sleeved on the outer periphery of the middle part of the mandrel, and the upper part of the outer cylinder of the rupture disc is connected to the lower part of the upper connector;

[0009] The lower connector is sleeved on the lower outer periphery of the mandrel, and the upper part of the lower connector is connected to the lower part of the outer cylinder of the rupture disc.

[0010] Optionally, the second tube is provided with a circulation hole, and the mandrel is provided with a flow channel that mates with the circulation hole.

[0011] Optionally, the upper inner circumference of the outer cylinder of the rupture disc is threadedly connected to the lower outer circumference of the upper connector.

[0012] Optionally, a first sealing ring is provided between the upper connector and the outer cylinder of the rupture disc;

[0013] A second sealing ring is provided between the upper connector and the mandrel.

[0014] Optionally, the outer cylinder of the rupture disc is provided with a rupture disc that mates with the mandrel;

[0015] A shear pin is provided between the upper connector and the mandrel.

[0016] Optionally, the upper inner circumference of the lower connector is threadedly connected to the lower outer circumference of the outer cylinder of the rupture disc.

[0017] Optionally, a third sealing ring is provided between the outer cylinder of the rupture disc and the lower connector;

[0018] A fourth sealing ring is provided between the outer cylinder of the rupture disc and the mandrel.

[0019] Optionally, a fifth sealing ring is provided on the outer periphery of the lower connector.

[0020] Optionally, the upper connector is provided with internal threads.

[0021] Optionally, the lower connector is provided with external threads.

[0022] The beneficial effects of this utility model are as follows: It provides a pressure-controlled circulation valve, including a mandrel, an upper connector, a fracturing disc outer cylinder, and a lower connector. The upper connector is tubular, with a first tube formed at the top for inserting an upper tool, and a second tube formed at the bottom. The upper part of the mandrel is slidably inserted into the second tube. The first and second tubes are connected by a third tube, the inner diameter of which is equal to the inner diameter of the mandrel. The inner diameter of the first tube is larger than that of the third tube. This inner diameter design ensures smooth fluid flow and reduces pressure loss. A slope is formed at the connection between the first and third tubes, which effectively guides the flow direction of the fluid and reduces resistance and erosion during flow. Especially under high sand volume conditions such as sand fracturing, it can effectively reduce the erosion of the upper connector by mud and sand, and extend the service life of the circulation valve.

[0023] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0024] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally represent like parts.

[0025] Figure 1 A schematic structural diagram of a pressure-controlled circulation valve according to Embodiment 1 of the present invention is shown.

[0026] Figure 2 It shows Figure 1 A partial schematic diagram of the structure of region A in the middle.

[0027] Figure 3 It shows Figure 1 A partial schematic diagram of the structure of region B in the middle.

[0028] Figure 4 It shows Figure 1 A partial schematic diagram of the structure of region C in the middle.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Mandrel; 11. Flow channel;

[0031] 2. Upper connector; 21. First pipe; 22. Second pipe; 23. Third pipe; 24. Slope; 25. Circulation hole;

[0032] 3. Outer cylinder of the rupture disc; 31. Rupture disc;

[0033] 4. Lower connector;

[0034] 5. Cut the pin;

[0035] 61. First sealing ring; 62. Second sealing ring; 63. Third sealing ring; 64. Fourth sealing ring; 65. Fifth sealing ring. Detailed Implementation

[0036] Preferred embodiments of the present invention will now be described in more detail. While preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0037] Example 1

[0038] like Figure 1-4 As shown, this embodiment provides a pressure-controlled circulation valve, including:

[0039] Mandrel 1, mandrel 1 is tubular;

[0040] The upper connector 2 is tubular. The upper part of the upper connector 2 forms a first tube 21 for inserting the upper tool, and the lower part of the upper connector 2 forms a second tube 22. The upper part of the mandrel 1 is slidably inserted into the second tube 22. The first tube 21 and the second tube 22 are connected by a third tube 23. The inner diameter of the third tube 23 is equal to the inner diameter of the mandrel 1. The inner diameter of the first tube 21 is larger than the inner diameter of the third tube 23. A slope 24 is formed at the connection between the first tube 21 and the third tube 23.

[0041] The outer cylinder 3 of the rupture disc is sleeved on the outer periphery of the middle part of the mandrel 1, and the upper part of the outer cylinder 3 of the rupture disc is connected to the lower part of the upper connector 2.

[0042] The lower connector 4 is sleeved on the lower outer periphery of the mandrel 1, and the upper part of the lower connector 4 is connected to the lower part of the outer cylinder 3 of the rupture disc.

[0043] Specifically, the internal structure of the upper connector 2 is designed with a first pipe 21, a second pipe 22, and a third pipe 23 connected together. The inner diameter of the third pipe 23 is equal to the inner diameter of the mandrel 1, while the inner diameter of the first pipe 21 is larger than that of the third pipe 23. This inner diameter design ensures smooth fluid flow and reduces pressure loss. The slope 24 formed at the connection between the first pipe 21 and the third pipe 23 effectively guides the flow direction of the fluid, reducing resistance and erosion during flow. Especially under high sand volume conditions such as sand fracturing, it can effectively reduce the erosion of the upper connector 2 by mud and sand, extending the service life of the circulation valve.

[0044] Optionally, the second tube 22 is provided with a circulation hole 25, and the spindle 1 is provided with a flow channel 11 that mates with the circulation hole 25.

[0045] Specifically, the mandrel 1 is moved up and down to align or misalign the circulation hole 25 with the flow channel 11, thereby opening or closing the circulation valve.

[0046] Optionally, the upper inner circumference of the outer cylinder 3 of the rupture disc is threadedly connected to the lower outer circumference of the upper connector 2.

[0047] Specifically, threaded connections not only facilitate installation and disassembly but also ensure a secure connection.

[0048] Optionally, a first sealing ring 61 is provided between the upper connector 2 and the outer cylinder 3 of the rupture disc; a second sealing ring 62 is provided between the upper connector 2 and the spindle 1.

[0049] Specifically, after the outer cylinder 3 of the rupture disc is threadedly connected to the upper connector 2, the first sealing ring 61 and the second sealing ring 62 are compressed to achieve a seal, thereby improving the sealing performance of the test circulation valve. This meets the sealing performance requirements of the circulation valve for existing test well depth, high temperature, and high pressure tests, solves the leakage problem in the test circulation valve itself, and improves the success rate of the test process.

[0050] Optionally, the outer cylinder 3 of the rupture disc is provided with a rupture disc 31 that mates with the mandrel 1; a shear pin 5 is provided between the upper connector 2 and the mandrel 1.

[0051] Specifically, the rupture disc 31 can rupture under a set pressure, thereby achieving pressure transmission and control. During cyclic operation, pressure is applied to the annulus, causing the annulus pressure to gradually increase. When the annulus pressure reaches the set value of the rupture disc 31, the rupture disc 31 ruptures. The rupture of the rupture disc 31 allows the annulus pressure to be transmitted to the upper part of the mandrel 1, pushing the mandrel 1 downward. The movement of the mandrel 1 shears off the shear pin 5, thereby releasing the fixation of the mandrel 1 and opening the circulation hole 25.

[0052] Optionally, the upper inner circumference of the lower connector 4 is threadedly connected to the lower outer circumference of the outer cylinder 3 of the rupture disc.

[0053] Specifically, the threaded connection ensures a secure connection between the lower connector 4 and the outer cylinder 3 of the rupture disc, improving the overall stability of the circulation valve.

[0054] Optionally, a third sealing ring 63 is provided between the outer cylinder 3 of the rupture disc and the lower connector 4; a fourth sealing ring 64 is provided between the outer cylinder 3 of the rupture disc and the spindle 1.

[0055] Specifically, after the lower connector 4 is threadedly connected to the outer cylinder 3 of the rupture disc, the third sealing ring 63 and the fourth sealing ring 64 are compressed to achieve a seal, thereby improving the sealing performance of the test circulation valve. This meets the sealing performance requirements of the circulation valve for existing test well depth, high temperature, and high pressure tests, solves the leakage problem in the test circulation valve itself, and improves the success rate of the test process.

[0056] Optionally, a fifth sealing ring 65 is provided on the outer periphery of the lower connector 4.

[0057] Specifically, the fifth sealing ring 65 improves the sealing between the lower connector 4 and the lower tool, preventing fluid leakage.

[0058] The working principle of the pressure-controlled circulation valve in this embodiment is as follows:

[0059] In the initial closed state, the upper part of the mandrel 1 is slidably inserted into the second tube 22 of the upper connector 2 and fixed between the upper connector 2 and the mandrel 1 by the shear pin 5. At this time, the circulation hole 25 is sealed by the upper part of the mandrel 1, and fluid cannot flow through the circulation hole 25.

[0060] When circulation operations are required, pressure is applied to the annulus, gradually increasing the annulus pressure. When the annulus pressure reaches the set value of the fracture disk 31, the fracture disk 31 ruptures. The rupture of the fracture disk 31 allows the annulus pressure to be transmitted to the upper part of the mandrel 1, pushing the mandrel 1 downwards. The movement of the mandrel 1 shears off the shear pin 5, thereby releasing the mandrel 1 from its fixation. After the mandrel 1 moves downwards, its upper part no longer seals the circulation hole 25, and fluid can enter the flow channel 11 through the circulation hole 25 of the second pipe 22, and then flow through the inner cavity of the mandrel 1, thus achieving circulation between the annulus and the tubing string. This circulation function can be used for the injection and discharge of fracturing fluid, or for measuring formation pressure and fluid properties during the testing phase.

[0061] Sealing rings are provided between the upper connector 2 and the outer cylinder 3 of the rupture disc, between the upper connector 2 and the mandrel 1, between the outer cylinder 3 of the rupture disc and the lower connector 4, and between the outer cylinder 3 of the rupture disc and the mandrel 1. This multi-layer sealing design can effectively prevent fluid leakage and ensure the sealing performance of the circulation valve under high pressure and complex operating conditions.

[0062] Example 2

[0063] This embodiment provides a pressure-controlled circulation valve, which differs from Embodiment 1 in that:

[0064] The upper connector 2 has an internal thread. The lower connector 4 has an external thread.

[0065] Specifically, the internal thread of the upper connector 2 and the external thread of the lower connector 4 can be used to connect with different tubing strings such as tubing and drill pipe, reducing the additional costs caused by tool mismatch and improving its economy.

[0066] The other settings in this embodiment are the same as in embodiment 1.

[0067] Example 3

[0068] This embodiment provides a pressure-controlled circulation valve, which differs from Embodiment 1 in that:

[0069] Mounting grooves for installing sealing rings are provided on the upper connector 211, the outer cylinder of the rupture disc 321, and the spindle 141. The sealing rings are not easily deformed in the mounting grooves, ensuring a good sealing effect.

[0070] The other settings in this embodiment are the same as in embodiment 1.

[0071] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A pressure-controlled circulation valve, characterized in that, include: Mandrel (1), wherein the mandrel (1) is tubular; The upper connector (2) is tubular. The upper part of the upper connector (2) forms a first tube (21) for inserting the upper tool, and the lower part of the upper connector (2) forms a second tube (22). The upper part of the mandrel (1) is slidably inserted into the second tube (22). The first tube (21) and the second tube (22) are connected by a third tube (23). The inner diameter of the third tube (23) is equal to the inner diameter of the mandrel (1). The inner diameter of the first tube (21) is greater than the inner diameter of the third tube (23). A slope (24) is formed at the connection between the first tube (21) and the third tube (23). The outer cylinder of the rupture disc (3) is sleeved on the outer periphery of the middle part of the mandrel (1), and the upper part of the outer cylinder of the rupture disc (3) is connected to the lower part of the upper connector (2). The lower connector (4) is sleeved on the lower outer periphery of the mandrel (1), and the upper part of the lower connector (4) is connected to the lower part of the outer cylinder (3) of the rupture disc.

2. The pressure-controlled circulation valve according to claim 1, characterized in that, The second tube (22) is provided with a circulation hole (25), and the spindle (1) is provided with a flow channel (11) that cooperates with the circulation hole (25).

3. The pressure-controlled circulation valve according to claim 1, characterized in that, The upper inner circumference of the outer cylinder (3) of the rupture disc is threadedly connected to the lower outer circumference of the upper connector (2).

4. The pressure-controlled circulation valve according to claim 3, characterized in that, A first sealing ring (61) is provided between the upper connector (2) and the outer cylinder (3) of the rupture disc; A second sealing ring (62) is provided between the upper connector (2) and the mandrel (1).

5. The pressure-controlled circulation valve according to claim 1, characterized in that, The outer cylinder (3) of the rupture disc is provided with a rupture disc (31) that cooperates with the mandrel (1); A shear pin (5) is provided between the upper connector (2) and the mandrel (1).

6. The pressure-controlled circulation valve according to claim 1, characterized in that, The upper inner circumference of the lower connector (4) is threadedly connected to the lower outer circumference of the outer cylinder (3) of the rupture disc.

7. The pressure-controlled circulation valve according to claim 6, characterized in that, A third sealing ring (63) is provided between the outer cylinder (3) of the rupture disc and the lower connector (4); A fourth sealing ring (64) is provided between the outer cylinder (3) of the rupture disc and the mandrel (1).

8. The pressure-controlled circulation valve according to claim 1, characterized in that, The lower connector (4) is provided with a fifth sealing ring (65) on its outer periphery.

9. The pressure-controlled circulation valve according to claim 1, characterized in that, The upper connector (2) is provided with internal threads.

10. The pressure-controlled circulation valve according to claim 1, characterized in that, The lower connector (4) is provided with external threads.

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