Self-grouting float valve for petroleum drilling

Abstract

The utility model relates to the technical field of blowout prevention tools in well drilling in the petroleum industry, in particular to a self-grouting float valve for petroleum well drilling, which comprises a valve body, a valve sleeve and a shunt seat are mounted in the valve body, a valve seat is arranged in an inner cavity of the valve sleeve, a guide spring seat is mounted in the middle of the shunt seat, and a spring is sleeved on the outer side of the guide spring seat. A guide rod is arranged in the guide spring seat in a sliding mode, and the top of the guide rod is connected with a mushroom head valve element. A sliding groove is formed in the upper portion of the guide spring seat, a guide pin matched with the sliding groove is installed on the guide rod in the radial direction, a thrust ball bearing is arranged at the bottom of the mushroom head valve element, and the top of the spring abuts against the bottom rotating face of the thrust ball bearing. A retaining pin is connected to the flow dividing base in the radial direction, and the retaining pin abuts against and fixes the guide spring base. The utility model has the advantages of simple and reasonable structure, and smoother and more stable mode switching.

Description

Technical Field

[0001] The utility model relates to the technical field of internal blowout prevention tools in oil industry drilling, and specifically relates to a self-grouting float valve for oil drilling. Background Art

[0002] The patent number is 202410917438.X, and the patent name is a self-grouting float valve for oil drilling, which is a self-grouting float valve independently developed by our company. The following problems are occasionally found in use:

[0003] First, both ends of the return spring are tightly fixed. When the valve core moves downward, it will rotate a certain angle, resulting in a certain torque acting on the return spring. In this way, after the pump stops, during the process of the return spring pushing the valve core upward, the torque is released, causing the guide pin to rotate upward from the vertical groove back to the spiral groove along the original path, and the purpose of converting from a self-grouting float valve to an ordinary float valve cannot be achieved.

[0004] Second, the guide spring seat and the shunt seat are not fully fixed, and there is a probability that the guide spring seat rotates during the mode conversion process, making the guide rod and the mushroom head valve core in an unstable state, resulting in an unsmooth mode switch. Summary of the Invention

[0005] The purpose of the utility model is to provide a self-grouting float valve for oil drilling in view of the defects existing in the prior art.

[0006] The technical solution of the utility model is: a self-grouting float valve for oil drilling, including a valve body, a valve sleeve and a shunt seat are installed in the valve body, a valve seat is arranged in the inner cavity of the valve sleeve, a guide spring seat is installed in the middle of the shunt seat, and a spring is sleeved outside the guide spring seat;

[0007] A guide rod is slidably arranged in the guide spring seat, the top of the guide rod extends out of the guide spring seat and is connected with a mushroom head valve core that cooperates with the valve seat, and a reset tool is connected to the top of the mushroom head valve core;

[0008] A chute is opened in the upper part of the guide spring seat, the chute includes a spiral groove and a vertical groove, an anti-inversion inclined surface is arranged in the middle of the vertical groove, and a guide pin is radially installed on the guide rod to cooperate with the chute;

[0009] A thrust ball bearing is arranged at the bottom of the mushroom head valve core, and the top of the spring abuts against the bottom rotating surface of the thrust ball bearing;

[0010] A middle hole is arranged on the shunt seat, the bottom of the guide spring seat is inserted into the middle hole, a limiting groove is opened on the outer wall of the part of the guide spring seat inserted into the middle hole, and a retaining pin is radially connected to the shunt seat, and the head of the retaining pin is inserted into the limiting groove.

[0011] Preferably, guiding inclined surfaces adapted to the anti-inclined surfaces are formed on the upper portions at both ends of the guiding pin.

[0012] Preferably, a transition arc surface which is in smooth transition with the outer wall of the guiding pin is formed on the lower portion of the guiding inclined surface.

[0013] Preferably, a groove is formed in the middle of the guiding pin, a set screw is threadedly connected to the guiding rod, and the head of the set screw is inserted into the groove.

[0014] Preferably, a spring guard covering the thrust ball bearing is connected to the bottom of the mushroom head valve core.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] When the pump is started in the utility model, the mud pressure pushes the mushroom head valve core to move downward, and the thrust ball bearing, the guiding rod and the guiding pin move downward together. Both ends of the guiding pin are located in the spiral groove, and during the downward movement, the guiding pin rotates downward along the spiral groove until it enters the vertical groove and moves downward along the vertical groove to be converted into a common floating valve. During the downward movement, the torque borne by the return spring is released by the thrust ball bearing, so that the switching mode is more stable.

[0017] In addition, when uncontrollable factors occur in the bottom hole working environment and cause the thrust ball bearing not to fully release the torque borne by the return spring, that is, there is a small torsional angle of the guiding pin, the guiding pin will also slide along the anti-inclined surface towards the center of the vertical groove through the guiding inclined surface and the transition arc surface, and can continue to move upward along the vertical groove, and the valve closes, further improving the use stability of the utility model.

[0018] By connecting a retaining pin on the shunt seat which is adapted to the limiting groove of the guiding spring seat, the guiding spring seat can be tightly held, avoiding the torsion of the guiding spring seat during work and improving the use stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a structural schematic diagram of the utility model;

[0020] Figure 2 is a schematic diagram of the cooperation between the guiding pin and the sliding groove;

[0021] Figure 3 is a schematic diagram of the cooperation between the guiding pin and the set screw;

[0022] In the figure: 1. Reset tool; 2. Valve body; 3. Valve sleeve; 4. Valve seat; 5. Mushroom head valve core; 6. Spring guard; 7. Guide spring seat; 8. Diverter seat; 9. Thrust ball bearing; 10. Set screw; 11. Guide rod; 12. Retaining pin; 13. Guide pin; 14. Vertical groove; 15. Spiral groove; 16. Slide groove; 17. Anti-inversion inclined surface; 18. Limit groove; 19. Guide inclined surface; 20. Transition arc surface; 21. Groove. Specific implementation mode

[0023] The following is a further description of the present utility model in conjunction with the attached drawings and embodiments. Embodiment 1

[0024] As Figures 1 to 3 , a self-grouting float valve for oil drilling, includes a valve body 2, a valve sleeve 3 and a diverter seat 8 are installed in the valve body 2, a valve seat 4 is arranged in the inner cavity of the valve sleeve 3, a guide spring seat 7 is installed in the middle of the diverter seat 8, and a spring is sleeved outside the guide spring seat 7.

[0025] A guide rod 11 is slidably arranged in the guide spring seat 7, the top of the guide rod 11 extends out of the guide spring seat 7 and is connected with a mushroom head valve core 5 that cooperates with the valve seat 4, and a reset tool 1 is connected to the top of the mushroom head valve core 5.

[0026] A slide groove 16 is opened in the upper part of the guide spring seat 7, the slide groove 16 includes a spiral groove 15 and a vertical groove 14, an anti-inversion inclined surface 17 is arranged in the middle of the vertical groove 14, and a guide pin 13 that cooperates with the slide groove 16 is installed radially on the guide rod 11.

[0027] A thrust ball bearing 9 is arranged at the bottom of the mushroom head valve core 5, the top of the spring abuts against the bottom rotating surface of the thrust ball bearing 9, and a spring guard 6 that covers the thrust ball bearing 9 is connected to the bottom of the mushroom head valve core 5.

[0028] A middle hole is arranged on the diverter seat 8, the bottom of the guide spring seat 7 is inserted into the middle hole, a limit groove 18 is opened on the outer wall of the part of the guide spring seat 7 inserted into the middle hole, and a retaining pin 12 is connected radially on the diverter seat 8, and the head of the retaining pin 12 is inserted into the limit groove 18.

[0029] By connecting a retaining pin 12 on the diverter seat 8 that cooperates with the limit groove 18 of the guide spring seat 7, the guide spring seat 7 can be tightened, avoiding the torsion of the guide spring seat 7 during work and improving the use stability.

[0030] When the pump of the present utility model is started, the mud pressure pushes the mushroom head valve core 5 downward, and the thrust ball bearing 9, the guide rod 11 and the guide pin 13 move downward together. The two ends of the guide pin 13 are located in the spiral groove 15, and during the downward movement, the guide pin 13 rotates downward along the spiral groove 15 until it enters the vertical groove 14, and then moves downward along the vertical groove 14 to be converted into a common floating valve. During the downward movement, the thrust ball bearing 9 releases the torque on the return spring, thereby making the switching mode more stable. Embodiment 2

[0031] This embodiment is further optimized on the basis of the above embodiment. Specifically:

[0032] As Figure 2 and Figure 3 , upper parts of both ends of the guide pin 13 are provided with guide inclined surfaces 19 that cooperate with the anti - reverse inclined surfaces 17, and a transition arc surface 20 that is smoothly transitioned with the outer wall of the guide pin 13 is provided at the lower part of the guide inclined surface 19.

[0033] In the bottom - hole working environment, once an uncontrollable factor causes the thrust ball bearing 9 not to fully release the torque on the return spring, that is, when the guide pin 13 has a small torsional angle, the guide pin 13 will also slide along the anti - reverse inclined surface 17 towards the center of the vertical groove 14 through the guide inclined surface 19 and the transition arc surface 20, and can continue to move upward along the vertical groove 14, further improving the use stability of the present utility model. Embodiment 3

[0034] This embodiment is further optimized on the basis of the above embodiment. Specifically:

[0035] As Figure 3 , a groove 21 is provided in the middle of the guide pin 13, and a set screw 10 is threadedly connected to the guide rod 11, and the head of the set screw 10 is inserted into the groove 21.

[0036] Through the cooperation of the set screw 10 and the groove 21, not only the position of the guide pin 13 is fixed, but also the self - rotation of the guide pin 13 is avoided, making the cooperation between the two ends of the guide pin 13 and the guide inclined surface 19 smoother.

[0037] The present utility model is not limited to the above - mentioned embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the gist of the present utility model, and the changed content still belongs to the protection scope of the present utility model.

Claims

1. A self-grouting float valve for oil drilling, comprising a valve body, a valve sleeve and a diverter seat are installed in the valve body, a valve seat is provided in the inner cavity of the valve sleeve, a guide spring seat is installed in the middle of the diverter seat, and a spring is sleeved on the outer side of the guide spring seat; A guide rod is slidably arranged in the guide spring seat, and a mushroom head valve core matching with the valve seat is connected to the top of the guide rod after the top of the guide rod extends out of the guide spring seat, and a reset tool is connected to the top of the mushroom head valve core; The upper part of the guide spring seat is provided with a slide groove, the slide groove includes a spiral groove and a vertical groove, the middle part of the vertical groove is provided with an anti-falling inclined surface, and the guide rod is radially provided with a guide pin that cooperates with the slide groove, characterized in that: A thrust ball bearing is provided at the bottom of the mushroom head valve core, and the top of the spring abuts against the bottom rotating surface of the thrust ball bearing; The diverter seat is provided with a central hole, the bottom of the guide spring seat is inserted into the central hole, a limiting groove is provided on the outer wall of the portion of the guide spring seat inserted into the central hole, a retaining pin is radially connected to the diverter seat, and the head of the retaining pin is inserted into the limiting groove.

2. A self-grouting float valve for oil drilling according to claim 1, characterized in that: The upper parts of the two ends of the guide pin are provided with guide inclined surfaces which match the anti-falling inclined surfaces.

3. A self-grouting float valve for oil drilling according to claim 2, characterized in that: The lower part of the guide inclined surface is provided with a transition arc surface which smoothly transitions with the outer wall of the guide pin.

4. A self-grouting float valve for oil drilling according to claim 2 or 3, characterized in that: A groove is arranged in the middle of the guide pin, a set screw is threadedly connected to the guide rod, and the head of the set screw is inserted into the groove.

5. The self-grouting float valve for oil drilling according to claim 1, characterized in that: The bottom of the mushroom head valve core is connected with a spring shield which covers the thrust ball bearing.

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