A highly efficient uninterrupted circulation valve tool

Abstract

The present invention discloses an efficient uninterrupted circulation valve tool, which includes a bypass valve assembly, a cylinder assembly and a clamping mechanism; the bypass valve assembly includes a drive pipe, an elastic hinge, a valve plate and a valve seat. The wall of the valve seat is provided with a valve groove and a side hole. The valve plate is located in the valve groove. One end of the valve plate is hinged to the top of the valve groove through an elastic hinge. The lower end of the drive pipe is slidably and sealingly connected to the valve seat; the pump cylinder assembly includes an upper joint, a middle cylinder, a lower joint and a bushing. The lower joint encapsulates the valve seat in the middle cylinder, and the upper joint encapsulates the bushing in the middle cylinder. The upper end of the drive pipe is slidably and sealingly connected to the bushing. An opening communicating with the side hole is provided on the wall of the middle cylinder; the clamping mechanism includes a hydraulic tong head and a lifter. The lifter is connected to the upper end of the hydraulic tong head and is used to push the drive pipe to move up and down. By moving the drive pipe up and down, the present invention switches the main channel and the side channel, so as to be able to maintain the continuous circulation of the drilling fluid when connecting a single pipe, and achieve a stable equivalent circulation density during the entire drilling period.

Description

Technical Field

[0001] The present invention relates to the technical field of oil equipment, and particularly relates to an efficient uninterrupted circulation valve tool. Background Art

[0002] At present, the drilling problems of deep wells in complex formations have become an important barrier restricting the development of China's oil and gas exploration and development. How to solve the main technical problems of deep well drilling in complex formations has attracted great attention in the oil and gas exploration and development industry. When drilling operations encounter wells with narrow drilling fluid density windows, the pump needs to be stopped and the circulation in the well interrupted during connection of drill collars or single joints. This not only increases the operation time, but also easily causes problems such as sand settlement, wellbore collapse, and even well kick after the well circulation is interrupted, posing great risks to operation safety. Summary of the Invention

[0003] The purpose of the present invention is to provide an efficient uninterrupted circulation valve tool in view of the defects existing in the prior art. The tool has a reasonable structure and can maintain continuous circulation of drilling fluid when connecting drill collars or single joints, enabling stable equivalent circulation density and uninterrupted cuttings discharge during the entire drilling process.

[0004] The technical solution of the present invention is as follows:

[0005] An efficient uninterrupted circulation valve tool includes a bypass valve assembly, a cylinder assembly, and a clamping mechanism;

[0006] The bypass valve assembly includes a drive pipe, an elastic hinge, a valve plate, and a valve seat. The valve seat is tubular, and a valve groove and side holes are provided on the wall of the valve seat. The valve plate is located in the valve groove, and one end of the valve plate is hinged to the top of the valve groove through an elastic hinge. The lower end of the drive pipe is slidably and sealingly connected to the valve seat;

[0007] The pump cylinder assembly includes an upper joint, a middle cylinder, a lower joint, and a bushing. The lower joint is connected to the lower end of the middle cylinder, and the valve seat is encapsulated in the middle cylinder through the lower joint. An opening corresponding to the side holes of the valve seat is provided on the wall of the middle cylinder. The upper joint is connected to the upper end of the middle cylinder, and the bushing is encapsulated in the middle cylinder through the upper joint. The upper end of the drive pipe is slidably and sealingly connected to the bushing, and a pin slot is further provided in the middle of the outer wall of the drive pipe. The pin slot is located in a through slot and moves up and down with the drive pipe;

[0008] The clamping mechanism includes a hydraulic chuck, a pin, and a lift. The jaws of the hydraulic chuck are adapted to the middle cylinder. The lift is fixedly connected to the upper end of the hydraulic chuck. One end of the pin is engaged with the pin slot, and the other end is connected to the lift and moves up and down with the lift.

[0009] Preferably, the elevator comprises a lead screw, a lead screw nut, a motor and a C-shaped bracket. The lower end of the bracket is fixedly connected to a hydraulic tong head. The bracket is provided with a longitudinal guiding groove. The lead screw is longitudinally hinged to the bracket. The lead screw nut is in threaded connection with the lead screw. One end of the insertion pin is fixedly connected to the lead screw nut, and the other end passes through the guiding groove and engages with the pin slot. The motor is fixedly connected to the bracket, and the rotating shaft of the motor is in driving connection with the lead screw.

[0010] Preferably, gears that mesh with each other are installed on one end of the lead screw and the rotating shaft of the motor.

[0011] Preferably, an annular groove is provided on the inner wall of the valve seat, and an O-ring seal is provided in the annular groove.

[0012] Preferably, an annular groove is provided on the inner wall of the bushing, and an O-ring seal is provided in the annular groove.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] The present invention can maintain continuous circulation of drilling fluid when connecting a single joint or a stand, enabling stable equivalent circulation density and uninterrupted cuttings discharge during the entire drilling process, comprehensively improving the wellbore conditions; especially when connecting a single joint, it can effectively avoid causing downhole pressure fluctuations, improve wellbore quality and cleanliness, and can maximize the guarantee that the already formed wellbore wall does not collapse during drilling in a narrow mud density window well, greatly reducing the occurrence of drilling accidents and the possibility of well kick, thereby improving the safety of drilling operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the open state of the valve plate and the closed state of the side holes of the bypass valve assembly;

[0016] Figure 2 It is a schematic diagram of the closed state of the valve plate and the open state of the side holes of the bypass valve assembly;

[0017] Figure 3 It is a schematic diagram of the structure of the present invention when connecting a stand;

[0018] Figure 4 It is a schematic diagram of the structure of the present invention when connecting a single joint;

[0019] Figure 5 It is a schematic diagram of the structure of the clamping mechanism;

[0020] In the figure: 1. upper sub, 2. middle cylinder, 3. lower sub, 4. bushing, 5. through groove, 6. pin slot, 7. opening, 8. drive pipe, 9. valve seat, 10. elastic hinge, 11. valve plate, 12. valve groove, 13. side hole, 14. lead screw, 15. lead screw nut, 16. motor, 17. C-shaped bracket, 18. guiding groove, 19. insertion pin, 20. jaw, 21. hydraulic tong head. Detailed implementation mode

[0021] The following further describes the present invention in conjunction with the accompanying drawings and embodiments.

[0022] An efficient uninterrupted circulation valve tool includes a bypass valve assembly, a cylinder assembly and a clamping mechanism;

[0023] See Figure 1 and Figure 2 As shown, the bypass valve assembly includes a drive tube 8, an elastic hinge 10, a valve plate 11 and a valve seat 9.

[0024] Among them, the valve seat 9 has a tubular structure. A valve groove 12 and a side hole 13 are successively opened on the wall of the valve seat 9 from top to bottom. The valve plate 11 is located in the valve groove 12, and one end of the valve plate 11 is hinged to the top of the valve groove 12 through an elastic hinge 10. The lower end of the drive tube 8 is slidably connected in the cavity of the valve seat 9. An annular groove is provided on the inner wall of the valve seat 9, and an O-ring is installed in the annular groove for sealing when the drive tube 8 slides with the valve seat 9.

[0025] See Figure 3 and Figure 4 As shown, the pump cylinder assembly includes an upper joint 1, a middle cylinder 2, a lower joint 3 and a bushing 4.

[0026] At the lower end of the inner cavity of the middle cylinder 2, there is an installation groove adapted to the valve seat 9. After the valve seat 9 is threadedly connected to the middle cylinder 2 through the lower joint 3, the valve seat 9 is encapsulated inside the middle cylinder 2. An opening 7 corresponding to the position of the side hole 13 is also opened on the wall of the middle cylinder 2, and a through-flow channel is formed through the opening 7 and the side hole 13.

[0027] At the upper end of the inner cavity of the middle cylinder 2, there is an installation groove adapted to the bushing 4. After the bushing 4 is threadedly connected to the middle cylinder 2 through the upper joint 1, the bushing 4 is encapsulated inside the middle cylinder 2.

[0028] The middle cylinder 2, the bushing 4, the valve seat 9 and the drive tube 8 are located on the same axis. The upper end of the drive tube 8 is slidably connected in the cavity of the bushing 4. An annular groove is also provided on the inner wall of the bushing 4, and an O-ring is installed in the annular groove for sealing when the drive tube 8 slides with the bushing 4. A pin groove 5 is provided in the middle of the outer wall of the drive tube 8, and the pin groove 5 moves up and down in the through groove 6 along with the drive tube 8.

[0029] See Figure 5 As shown, the clamping mechanism includes a hydraulic tong head 21, a pin 19 and a lift.

[0030] The hydraulic tong head 21 has the same structure as the hydraulic tong head used for clamping drill pipes during current drilling operations. At the same time, the jaws 20 of the hydraulic tong head 21 are adapted to the outer periphery of the middle cylinder 2. The elevator is fixedly connected to the upper end of the hydraulic tong head 21. One end of the pin 19 engages with the pin slot 5, and the other end is connected to the elevator and moves up and down with the elevator. The driving pipe 8 is pushed to move up and down by the elevator.

[0031] Working principle:

[0032] During operation, the hydraulic tong head 20 is used to fix the middle cylinder 2, and single joints or stands are connected according to specific drilling conditions.

[0033] When connecting a stand: Refer to Figure 1 and Figure 3 As shown, start the elevator. The driving pipe 8 descends with the elevator. During the descent, the driving pipe 8 pushes the valve plate 11 open and closes the side hole 13 at the same time. At this time, the upper joint 1, the bushing 4, the driving pipe 8, the valve seat 9, and the lower joint 3 are connected to form the main channel, and the drilling fluid establishes a complete drilling fluid circulation channel through the main channel and the annulus of the wellbore.

[0034] When connecting a single joint: Refer to Figure 2 and Figure 4 As shown, start the elevator. The driving pipe 8 rises with the elevator. When the bottom of the driving pipe 8 is higher than the valve plate 11 during the ascent, the valve plate 11 flips up under the support of the elastic hinge 10 to close the inner cavity of the valve seat 9, and the side hole 13 is opened at the same time. At this time, the valve seat 9, the side hole 13 on the valve seat 9, and the lower joint 3 are connected to form the side channel, and the drilling fluid establishes a circulating channel of the drilling fluid in the well through the side channel and the annulus downhole.

[0035] When switching operations between stands and single joints in the present invention, it is not necessary to stop the pump or interrupt the mud circulation, thereby ensuring the normal circulation downhole, achieving a stable equivalent circulation density and continuous cuttings discharge during the entire drilling period, and comprehensively improving the wellbore conditions.

[0036] Especially when making a connection of a single joint, it effectively avoids causing downhole pressure fluctuations, improves the wellbore quality and cleanliness. For drilling in wells with a narrow mud density window, it can maximize the guarantee that the already formed wellbore wall does not collapse, greatly reduce the occurrence of drilling accidents, and reduce the possibility of well kicks, thereby improving the safety of drilling operations.

[0037] Embodiment 2

[0038] This embodiment is a further optimization of the elevator. Specifically, the elevator includes a lead screw 14, a nut 15, a motor 16, and a C-shaped bracket 17.

[0039] The lower end of the bracket 17 is fixedly connected to the hydraulic tong head 21. A longitudinal guide groove 18 is provided on the side surface of the bracket 17. The lead screw 14 is longitudinally hinged on the bracket. The nut 15 is threadedly connected to the lead screw 14. One end of the insertion pin 19 is fixedly connected to the nut 15, and the other end passes through the guide groove 18 and engages with the pin slot 5.

[0040] The motor 16 is a brushless motor. The motor 16 is fixedly connected to the bracket. Gears that mesh with each other are installed on the lead screw 14 and the rotating shaft of the motor 16.

[0041] By rotating the motor 16 to drive the lead screw 14 to rotate, at the same time, the nut 15 moves up and down along with the rotating lead screw 14, so that the insertion pin 19 connected to the nut 15 pushes the drive pipe 8 to move up and down, realizing the opening and closing of the bypass valve assembly.

[0042] The structure of the above elevator is only a relatively preferred way in this embodiment. Among them, the elevator can also use a hydraulic cylinder or other tools with lifting functions instead. In this embodiment, by adjusting the speed of the motor 16, the up and down speeds of the drive pipe 8 can be adjusted, so it is more flexible than other lifting tools with a single speed.

Claims

1. An efficient uninterrupted circulation valve tool, Characterized in that: It includes a bypass valve assembly, a cylinder assembly and a clamping mechanism; the bypass valve assembly includes a drive pipe, an elastic hinge, a valve plate and a valve seat. The valve seat is tubular, and a valve groove and a side hole are provided on the wall of the valve seat. The valve plate is located in the valve groove, and one end of the valve plate is hinged to the top of the valve groove through an elastic hinge. The lower end of the drive pipe is slidably and sealedly connected to the valve seat; the cylinder assembly includes an upper joint, a middle cylinder, a lower joint and a bushing. The lower joint is connected to the lower end of the middle cylinder, and the valve seat is encapsulated in the middle cylinder through the lower joint. An opening corresponding to the side hole of the valve seat is provided on the wall of the middle cylinder. The upper joint is connected to the upper end of the middle cylinder, and the bushing is encapsulated in the middle cylinder through the upper joint. The upper end of the drive pipe is slidably and sealedly connected to the bushing. A pin slot is also provided in the middle of the outer wall of the drive pipe. The pin slot is located in the through slot and moves up and down with the drive pipe; the clamping mechanism includes a hydraulic clamp head, a pin and a lifter. The jaws of the hydraulic clamp head are adapted to the middle cylinder. The lifter is fixedly connected to the upper end of the hydraulic clamp head. One end of the pin is engaged with the pin slot, and the other end is connected to the lifter and moves up and down with the lifter; the lifter includes a lead screw, a nut sleeve, a motor and a C-shaped bracket. The lower end of the bracket is fixedly connected to the hydraulic clamp head. A longitudinal guide groove is provided on the bracket. The lead screw is longitudinally hinged on the bracket. The nut sleeve is threadedly connected to the lead screw. One end of the pin is fixedly connected to the nut sleeve, and the other end passes through the guide groove and is engaged with the pin slot. The motor is fixedly connected to the bracket, and the rotating shaft of the motor is drivingly connected to the lead screw; gears meshing with each other are installed on one end of the lead screw and the rotating shaft of the motor; an annular groove is provided on the inner wall of the valve seat, and an O-ring is provided in the annular groove.

2. An efficient uninterrupted circulation valve tool according to claim 1, Characterized in that: An annular groove is provided on the inner wall of the bushing, and an O-ring is provided in the annular groove.

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