Large-drift-diameter pressure-controlled safety circulating valve

Abstract

The utility model provides a large-drift-diameter pressure-controlled safety circulating valve, which belongs to the technical field of conventional oil-gas well fracturing test combined process and comprises an outer cylinder assembly, a mandrel, a shear pin, a ball valve, a rupture disc, a fluid channel and a circulating hole. The core shaft is arranged in the outer cylinder assembly in a sliding manner, and the inner diameter of the core shaft is 70-80 mm; the shear pin is arranged between the outer cylinder assembly and the mandrel; the ball valve is arranged in the outer cylinder assembly and located below the mandrel, and the ball valve is in transmission connection with the mandrel. The rupture disk is arranged on the cylinder wall of the outer cylinder assembly and used for being matched with the mandrel. The fluid channel is arranged at the upper part of the mandrel; the circulating hole is formed in the cylinder wall of the outer cylinder assembly and used for being matched with the fluid channel. The safety circulating valve is used for being connected in a fracturing test pipe string to play a role in circulating well killing, the inner drift diameter of the pressure-controlled safety circulating valve is increased, the overflowing area of a circulating hole is optimized, the circulating resistance of well killing fluid is reduced, and heavy slurry circulating well killing is facilitated.

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 large-diameter pressure-controlled safety circulation valve. Background Technology

[0002] Combined fracturing and testing 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 simultaneously improving formation permeability and oil and gas production. This technology not only enhances 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] As conventional oil and gas resources gradually deplete, oil and gas exploration and development are increasingly shifting towards deeper, low-permeability, and unconventional reservoirs. These reservoirs often exhibit low permeability and small porosity, making traditional extraction methods insufficient for efficient development. Therefore, high-volume fracturing technology, as an effective production enhancement method, is widely used in the development of these difficult-to-extract reservoirs. However, conventional pressure-controlled safety circulation valves, typically with a diameter of 57mm, become bottlenecks in fracturing test tubing, significantly hindering the increase in fracturing throughput. Utility Model Content

[0004] The purpose of this invention is to provide a large-diameter pressure-controlled safety circulation valve to solve the problem of small diameter in conventional pressure-controlled safety circulation valves.

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

[0006] Outer tube assembly;

[0007] A mandrel, which is slidably disposed within the outer cylinder assembly, has an inner diameter of 70mm-80mm;

[0008] A shear pin is disposed between the outer cylinder assembly and the mandrel;

[0009] A ball valve is disposed within the outer cylinder assembly and located below the mandrel, and the ball valve is drively connected to the mandrel;

[0010] A rupture disc is disposed on the cylinder wall of the outer cylinder assembly and is used to cooperate with the mandrel;

[0011] A fluid channel is provided on the upper part of the mandrel;

[0012] A circulation hole is provided on the cylinder wall of the outer cylinder assembly for engaging with the fluid channel.

[0013] Optionally, the outer diameter of the outer cylinder assembly is 152mm-160mm.

[0014] Optionally, the outer cylinder assembly includes:

[0015] The upper connector, wherein the circulation hole is disposed on the upper connector;

[0016] The outer cylinder of the rupture disc is threadedly connected at its upper part to the lower part of the upper connector;

[0017] The ball valve outer cylinder, the upper part of which is threadedly connected to the lower part of the rupture disc outer cylinder;

[0018] The lower connector is threaded to the lower part of the outer cylinder of the ball valve.

[0019] Optionally, the circulation hole is disposed on the upper connector;

[0020] The outer cylinder of the rupture disc is provided with mounting holes, and the rupture disc is mounted in the mounting holes;

[0021] The ball valve is located inside the outer cylinder of the ball valve.

[0022] Optionally, the ball valve includes a ball cage and a valve core, wherein the ball cage is fixedly disposed inside the outer cylinder of the ball valve, and the valve core is rotatably disposed inside the ball cage.

[0023] Optionally, the upper connector has a first space, a second space, and a third space formed from top to bottom. The first space is used to insert the upper tool, the third space is used to accommodate the mandrel, and the second space is used to connect the first space and the third space. The inner diameter of the second space, the inner diameter of the mandrel, and the inner diameter of the ball valve are equal.

[0024] Optionally, the inner diameter of the first space is larger than the inner diameter of the second space, and the first space and the second space are connected by a tapering section.

[0025] Optionally, the lower part of the upper connector is provided with external threads;

[0026] The upper part of the outer cylinder of the rupture disc is provided with internal threads;

[0027] The lower part of the outer cylinder of the rupture disc is provided with external threads;

[0028] The upper part of the outer cylinder of the ball valve is provided with internal threads;

[0029] The lower part of the outer cylinder of the ball valve is provided with external threads;

[0030] The upper part of the lower connector is provided with internal threads.

[0031] Optionally, a first sealing ring is provided between the upper connector and the mandrel;

[0032] A second sealing ring is provided between the outer cylinder of the rupture disc and the upper connector;

[0033] A third sealing ring is provided between the outer cylinder of the rupture disc and the mandrel;

[0034] A fourth sealing ring is provided between the outer cylinder of the ball valve and the outer cylinder of the rupture disc;

[0035] The lower connector is provided with a fifth sealing ring on its outer periphery.

[0036] Optionally, the inner circumference of the upper connector is provided with an internal thread;

[0037] The lower connector has external threads on its outer periphery.

[0038] The beneficial effects of this utility model are as follows: It provides a large-diameter pressure-controlled safety circulation valve, including: an outer cylinder assembly, a mandrel, a shear pin, a ball valve, a fracturing disc, a fluid channel, and a circulation hole; the mandrel is slidably disposed within the outer cylinder assembly, and the inner diameter of the mandrel is 70mm-80mm; the shear pin is disposed between the outer cylinder assembly and the mandrel; the ball valve is disposed within the outer cylinder assembly and located below the mandrel, and the ball valve is drively connected to the mandrel; the fracturing disc is disposed on the cylinder wall of the outer cylinder assembly for cooperating with the mandrel; the fluid channel is disposed on the upper part of the mandrel; the circulation hole is disposed on the cylinder wall of the outer cylinder assembly for cooperating with the fluid channel. This safety circulation valve is used to connect in a fracturing test tubing string to play the role of circulating well control. This utility model increases the internal diameter of the pressure-controlled safety circulation valve, optimizes the flow area of ​​the circulation hole, reduces the circulation resistance of the kill fluid, and is beneficial for heavy slurry circulation well control.

[0039] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0040] 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.

[0041] Figure 1 A schematic structural diagram of the large-diameter pressure-controlled safety circulation valve of Embodiment 1 of this utility model is shown.

[0042] Figure 2 It shows Figure 1 A schematic structural diagram of region A in the middle.

[0043] Figure 3 It shows Figure 1 A schematic structural diagram of region B in the middle.

[0044] Figure 4 It shows Figure 1 A schematic structural diagram of region C in the middle.

[0045] Figure 5 It shows Figure 1 A schematic structural diagram of region D in the middle.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1. Outer cylinder assembly; 11. Upper connector; 11a. First space; 11b. Second space; 11c. Third space; 11d. Tapered section; 12. Rupture disc outer cylinder; 13. Ball valve outer cylinder; 14. Lower connector; 2. Mandrel; 3. Shear pin; 4. Ball valve; 41. Ball cage; 42. Valve core; 5. Rupture disc; 6. Circulation hole; 7. Fluid passage; 81. First sealing ring; 82. Second sealing ring; 83. Third sealing ring; 84. Fourth sealing ring; 85. Fifth sealing ring. Detailed Implementation

[0048] 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.

[0049] like Figure 1-5 As shown, this embodiment provides a large-diameter pressure-controlled safety circulation valve, comprising:

[0050] Outer cylinder assembly 1;

[0051] Mandrel 2 is slidably disposed inside outer cylinder assembly 1, and the inner diameter of mandrel 2 is 70mm-80mm;

[0052] Shear pin 3 is positioned between outer cylinder assembly 1 and spindle 2;

[0053] Ball valve 4 is located inside the outer cylinder assembly 1 and below the spindle 2. Ball valve 4 is connected to the spindle 2 in a driving connection.

[0054] The rupture disc 5 is disposed on the cylinder wall of the outer cylinder assembly 1 and is used to cooperate with the mandrel 2.

[0055] Fluid channel 7 is located on the upper part of mandrel 2;

[0056] The circulation hole 6 is located on the cylinder wall of the outer cylinder assembly 1 and is used to cooperate with the fluid channel 7.

[0057] This safety circulation valve is used to connect to the fracturing test tubing string to perform circulating well control. Its working principle is as follows:

[0058] Initially, ball valve 4 is open, allowing fluid to flow freely within the tubing. The fluid channel 7 on the upper part of mandrel 2 is misaligned with the circulation hole 6, closing the circulation hole 6 and preventing fluid from entering the annulus. The annulus pressure has not yet reached the set pressure of the fracture disc 5, and the fracture disc 5 remains unruptured. When a circulation kill operation is required, pressure is applied to the annulus through the wellhead. This pressure is applied to the fracture disc 5, and when it reaches the set pressure, the fracture disc 5 ruptures. The annulus pressure continues to be transmitted to mandrel 2, pushing it downwards and shearing the shear pin 3. As mandrel 2 descends, it closes ball valve 4 via a transmission connection, cutting off the fluid channel 7 within the tubing. After mandrel 2 descends, its upper fluid channel 7 aligns with the circulation hole 6 on the outer cylinder assembly 1, allowing fluid to enter the annulus through the circulation hole 6, thus achieving circulation. After ball valve 4 closes, the lower part of the tubing is sealed off, and fluid enters the annulus through the circulation hole 6, achieving fluid circulation and discharge within the tubing. By injecting kill fluid into the annulus, oil, gas, and other fluids inside the tubing are circulated out of the tubing, thus completing the kill operation.

[0059] In this embodiment, the inner diameter of the mandrel 2 is set to 75mm, which increases the internal diameter, optimizes the flow area of ​​the circulation hole 6, reduces the circulation resistance of the kill fluid, and facilitates heavy slurry circulation kill.

[0060] Optionally, the outer diameter of the outer cylinder assembly 1 is 152mm-160mm.

[0061] In this embodiment, the outer diameter of the outer cylinder assembly 1 is set to 152mm. By increasing the tool wall thickness, the pressure-bearing strength of the outer cylinder assembly 1 is improved, so as to achieve the purpose of increasing the diameter without reducing the overall pressure resistance.

[0062] Optionally, the outer cylinder assembly 1 includes:

[0063] Upper connector 11, circulation hole 6 is provided on upper connector 11;

[0064] The outer cylinder 12 of the rupture disc is threaded to the lower part of the upper connector 11.

[0065] The upper part of the ball valve outer cylinder 13 is threadedly connected to the lower part of the rupture disc outer cylinder 12;

[0066] The lower connector 14 is threaded to the lower part of the outer cylinder 13 of the ball valve.

[0067] Optionally, the circulation hole 6 is provided on the upper connector 11;

[0068] The outer cylinder 12 of the rupture disc is provided with mounting holes, and the rupture disc 5 is installed in the mounting holes;

[0069] Ball valve 4 is located inside the outer cylinder 13 of the ball valve.

[0070] Specifically, both the upper connector 11 and the lower connector 14 are airtight fasteners used to connect the upper and lower tools. The rupture pressure can be set through the rupture disc 5. Under the action of annular pressure, after the rupture disc 5 ruptures, the mandrel 2 moves downward under the action of annular pressure, driving the ball valve 4 to close and sealing the inside of the tubing.

[0071] Optionally, the ball valve 4 includes a ball cage 41 and a valve core 42. The ball cage 41 is fixedly installed inside the outer cylinder 13 of the ball valve, and the valve core 42 is rotatably installed inside the ball cage 41.

[0072] Example 2

[0073] This embodiment provides a large-diameter pressure-controlled safety circulation valve, which differs from Embodiment 1 in that:

[0074] The upper connector 11 has a first space 11a, a second space 11b and a third space 11c formed from top to bottom. The first space 11a is used to insert the upper tool, the third space 11c is used to accommodate the mandrel 2, and the second space 11b is used to connect the first space 11a and the third space 11c. The inner diameter of the second space 11b, the inner diameter of the mandrel 2 and the inner diameter of the ball valve 4 are equal.

[0075] In this embodiment, the inner diameter of the mandrel 2, the inner diameter of the ball valve 4, and the inner diameter of the second space 11b are all set to 75mm to meet the requirements of large-volume sand fracturing, and the tool remains in full bore.

[0076] Optionally, the inner diameter of the first space 11a is larger than the inner diameter of the second space 11b, and the first space 11a and the second space 11b are connected by a tapering portion 11d.

[0077] Specifically, the tapered section 11d forms an erosion-resistant slope, which can effectively improve the erosion resistance during sand fracturing and meet the needs of large-scale sand fracturing test construction.

[0078] The other settings in this embodiment are the same as in embodiment 1.

[0079] Example 3

[0080] This embodiment provides a large-diameter pressure-controlled safety circulation valve, which differs from Embodiment 1 in that:

[0081] The lower part of the upper connector 11 is provided with an external thread; the upper part of the outer cylinder 12 of the rupture disc is provided with an internal thread; the lower part of the outer cylinder 12 of the rupture disc is provided with an external thread; the upper part of the outer cylinder 13 of the ball valve is provided with an internal thread; the lower part of the outer cylinder 13 of the ball valve is provided with an external thread; the upper part of the lower connector 14 is provided with an internal thread.

[0082] Specifically, threaded connections offer good sealing performance and make assembly relatively convenient.

[0083] Optionally, a first sealing ring 81 is provided between the upper connector 11 and the spindle 2; a second sealing ring 82 is provided between the outer cylinder 12 of the rupture disc and the upper connector 11; a third sealing ring 83 is provided between the outer cylinder 12 of the rupture disc and the spindle 2; a fourth sealing ring 84 is provided between the outer cylinder 13 of the ball valve and the outer cylinder 12 of the rupture disc; and a fifth sealing ring 85 is provided on the outer periphery of the lower connector 14.

[0084] Specifically, the first sealing ring 81, the second sealing ring 82, the third sealing ring 83, the fourth sealing ring 84, and the fifth sealing ring 85 are compressed and sealed, which improves the sealing performance of the circulation valve, 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.

[0085] The other settings in this embodiment are the same as in embodiment 1.

[0086] Example 4

[0087] This embodiment provides a large-diameter pressure-controlled safety circulation valve, which differs from Embodiment 1 in that:

[0088] The upper connector 11 has an internal thread on its inner circumference; the lower connector 14 has an external thread on its outer circumference.

[0089] Specifically, the upper connector 11 of the safety circulation valve has an internal thread on its upper part and the lower connector 14 has an external thread on its lower part, which can be connected to different tubing strings such as oil pipes and drill pipes, enhancing its versatility and flexibility in different application scenarios.

[0090] The other settings in this embodiment are the same as in embodiment 1.

[0091] Example 5

[0092] This embodiment provides a large-diameter pressure-controlled safety circulation valve, which differs from Embodiment 1 in that:

[0093] This large-diameter pressure-controlled safety circulation valve is made of high-pressure resistant, corrosion-resistant, and high-strength metal materials. The circulation hole 6 has an increased flow area and is coated with erosion-resistant material, which is more conducive to heavy slurry circulation for well control and improves well control safety.

[0094] The other settings in this embodiment are the same as in embodiment 1.

[0095] Example 6

[0096] This embodiment provides a large-diameter pressure-controlled safety circulation valve, which differs from Embodiment 1 in that:

[0097] The upper connector 11, the outer cylinder of the rupture disc 12, the mandrel 2, and the lower connector 14 are provided with mounting grooves. The first sealing ring 81, the second sealing ring 82, the third sealing ring 83, the fourth sealing ring 84, and the fifth sealing ring 85 are all installed in the mounting grooves, which are not easily deformed and ensure a good sealing effect.

[0098] 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 large-diameter pressure-controlled safety circulation valve, characterized in that, include: Outer cylinder assembly (1); Mandrel (2), the mandrel (2) is slidably disposed in the outer cylinder assembly (1), the inner diameter of the mandrel (2) is 70mm-80mm; A shear pin (3) is disposed between the outer cylinder assembly (1) and the mandrel (2); A ball valve (4) is disposed inside the outer cylinder assembly (1) and located below the spindle (2), and the ball valve (4) is connected to the spindle (2) in a driving connection. A rupture disc (5) is disposed on the cylinder wall of the outer cylinder assembly (1) for cooperating with the mandrel (2); A fluid channel (7) is provided on the upper part of the mandrel (2); A circulation hole (6) is provided on the cylinder wall of the outer cylinder assembly (1) for cooperating with the fluid channel (7).

2. The large-diameter pressure-controlled safety circulation valve according to claim 1, characterized in that, The outer diameter of the outer cylinder assembly (1) is 152mm-160mm.

3. The large-diameter pressure-controlled safety circulation valve according to claim 1, characterized in that, The outer cylinder assembly (1) includes: Upper connector (11), wherein the circulation hole (6) is disposed on the upper connector (11); The outer cylinder (12) of the rupture disc is threadedly connected at its upper part to the lower part of the upper connector (11); The upper part of the ball valve outer cylinder (13) is threadedly connected to the lower part of the rupture disc outer cylinder (12); The lower connector (14) is threadedly connected at its upper part to the lower part of the outer cylinder (13) of the ball valve.

4. The large-diameter pressure-controlled safety circulation valve according to claim 3, characterized in that, The circulation hole (6) is provided on the upper connector (11); The outer cylinder (12) of the rupture disc is provided with a mounting hole, and the rupture disc (5) is installed in the mounting hole; The ball valve (4) is located inside the outer cylinder (13) of the ball valve.

5. The large-diameter pressure-controlled safety circulation valve according to claim 4, characterized in that, The ball valve (4) includes a ball cage (41) and a valve core (42). The ball cage (41) is fixedly installed inside the outer cylinder (13) of the ball valve, and the valve core (42) is rotatably installed inside the ball cage (41).

6. The large-diameter pressure-controlled safety circulation valve according to claim 3, characterized in that, The upper connector (11) has a first space (11a), a second space (11b), and a third space (11c) formed from top to bottom. The first space (11a) is used to insert the upper tool, the third space (11c) is used to accommodate the mandrel (2), and the second space (11b) is used to connect the first space (11a) and the third space (11c). The inner diameter of the second space (11b), the inner diameter of the mandrel (2), and the inner diameter of the ball valve (4) are equal.

7. The large-diameter pressure-controlled safety circulation valve according to claim 6, characterized in that, The inner diameter of the first space (11a) is larger than the inner diameter of the second space (11b), and the first space (11a) and the second space (11b) are connected by a tapering portion (11d).

8. The large-diameter pressure-controlled safety circulation valve according to claim 3, characterized in that, The lower part of the upper connector (11) is provided with external threads; The upper part of the outer cylinder (12) of the rupture disc is provided with internal threads; The lower part of the outer cylinder (12) of the rupture disc is provided with external threads; The upper part of the outer cylinder (13) of the ball valve is provided with an internal thread; The lower part of the outer cylinder (13) of the ball valve is provided with external threads; The upper part of the lower connector (14) is provided with internal threads.

9. The large-diameter pressure-controlled safety circulation valve according to claim 8, characterized in that, A first sealing ring (81) is provided between the upper connector (11) and the mandrel (2); a second sealing ring (82) is provided between the outer cylinder (12) of the rupture disc and the upper connector (11); A third sealing ring (83) is provided between the outer cylinder (12) of the rupture disc and the mandrel (2); A fourth sealing ring (84) is provided between the outer cylinder of the ball valve (13) and the outer cylinder of the rupture disc (12); The lower connector (14) is provided with a fifth sealing ring (85) on its outer periphery.

10. The large-diameter pressure-controlled safety circulation valve according to claim 3, characterized in that, The inner circumference of the upper connector (11) is provided with an internal thread; The lower connector (14) has an external thread on its outer periphery.

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