A manually operated single ram preventer anti-lift safety device

Abstract

The application discloses a kind of manual single shutter blowout preventer anti-lifting safety device, it is when the shutter of manual single shutter blowout preventer is completely opened, shutter shaft end surface push lever (3), press down pneumatic switch valve (2) spool, the air inlet of pneumatic switch valve (2) is communicated with the air outlet, combined valve gas supply is normal, can be lifted oil pipe, alarm (BJ) light does not bright, when manual single shutter blowout preventer has not completely opened, shutter shaft end surface (2301) fails to push lever (3), pneumatic switch valve (2) spool is extended under the action of spring, the air inlet of pneumatic switch valve (2) is not communicated with the air outlet, the air outlet is communicated with exhaust port, cut off combined valve gas supply, winch clutch has no air pressure and can not be hung, can not be lifted oil pipe, simultaneously, alarm (BJ) light flashes.The application realizes the function of manual single shutter blowout preventer anti-lifting, and prevents the occurrence of safety accident.

Description

Technical Field

[0001] This invention relates to a safety device for the air supply circuit of a manual single-brake blowout preventer and a well workover vehicle winch clutch, and in particular to a safety device for preventing breakage during lifting of a manual single-brake blowout preventer. Background Technology

[0002] The interlocking safety device between the blowout preventer (BOP) and the workover rig winch clutch is a crucial safety feature in well control operations during minor workovers. Currently, this interlocking safety device is widely used with hydraulic BOPs. However, manual BOPs, due to the difficulty in extracting the gate switch signal, currently lack a safety device that interlocks with the workover rig winch clutch. At present, the on / off status of manual single-gate BOPs relies entirely on manual judgment. Methods such as hanging a warning sign on the BOP or affixing a reminder label to the driller's box are used to remind the driller to open the BOP before pulling the tubing. However, in actual production, it still occurs frequently that the tubing is pulled before the BOP is opened. Because manual single-gate BOPs lack any technical safeguards, relying solely on manual judgment of the BOP's on / off status poses a significant safety risk. Summary of the Invention

[0003] This invention provides a safety device for preventing the breakage of a manual single-gate blowout preventer, which realizes the function of preventing the breakage of the manual single-gate blowout preventer and eliminates the occurrence of safety accidents.

[0004] This invention adopts the following technical solution: a manual single-gate blowout preventer anti-lifting safety device, which includes two sets of control mechanisms for switching on and off the air supply circuit of the combined valve and an air circuit alarm circuit. The two control mechanisms for switching on and off the air supply circuit of the combined valve are respectively installed on the two guards of the manual single-gate blowout preventer. Each control mechanism for switching on and off the air supply circuit of the combined valve includes a clamp assembly and an actuator. The clamp assembly is fixedly sleeved on the guard. The actuator includes a drive device and a pneumatic switching valve. The drive device is located between the pneumatic switching valve and the guard of the manual single-gate blowout preventer. One end of the drive device passes through the clamp assembly. The hoop assembly extends into the long groove on the surface of the protective cover and contacts the end face of the gate shaft inside the protective cover. The other end of the drive device corresponds to the valve core of the pneumatic switch valve. Two pneumatic switch valves are connected in series to the air supply circuit of the combination valve of the well workover rig winch clutch. An air circuit alarm circuit is connected to the air inlet pipe of each pneumatic switch valve. Each drive device of the present invention includes a lever and a pin. The lever and the pneumatic switch valve are arranged side by side. Mounting plate I and mounting plate II are respectively provided on the upper and lower parts of the pneumatic switch valve. Mounting plate I and mounting plate II are the same size and parallel to each other. One end of mounting plate I and one end of mounting plate II are fixed to the hoop. On the outer arc surface of the clamp assembly, the pneumatic switch valve is fixedly installed in the interlayer between mounting plate I and mounting plate II. Adjustment devices are installed at the other ends of mounting plate I and mounting plate II. A pin passes through mounting plate I, lever, and mounting plate II sequentially from top to bottom, then installs the lever in the interlayer. The lever rotates around the pin. The bent end of one end of the lever is close to the head of the pneumatic switch valve core. The straight end of the other end of the lever passes through the clamp assembly and extends into a long groove on the protective cover, contacting the end face of the gate shaft inside the protective cover. The clamp assembly of this invention includes a left half-clamp body and a right half-clamp body. All are set as semi-circles. The two ends of the left half hoop are connected to the two ends of the corresponding right half hoop through the cooperation of screw I and nut I to form a circular clamp assembly. One end of mounting plate I and one end of mounting plate II are fixed to the outer arc surface of the right half hoop. A stiffener I is provided between the upper part of the outer arc surface of the right half hoop and mounting plate I, and a stiffener II is provided between the lower part of the outer arc surface of the right half hoop and mounting plate II. The stiffener I and the stiffener II are flush with the end face of the right half hoop. The straight end of the other end of the lever passes through the arc surface of the right half hoop and extends into the long groove provided on the protective cover, contacting the end face of the gate shaft inside the protective cover.

[0005] Furthermore, a stop pin is fixedly welded to the inner arc surface of the right half of the hoop, which is used to prevent relative movement between the hoop assembly and the protective cover.

[0006] Furthermore, the adjustment device includes an adjusting nut II and an adjusting screw II. The adjusting nut II is fixed on the other end face of the mounting plate I and the other end face of the mounting plate II. The adjusting screw II passes through the adjusting nut II and corresponds to the pneumatic switch valve. Rotating the adjusting screw II to push the pneumatic switch valve to move can adjust the gap between the pneumatic switch valve and the bent end of the lever.

[0007] Furthermore, the pneumatic alarm circuit includes pressure switch I, pressure switch II, a power supply, a fuse, and a light alarm. Pressure switch I is connected to the air inlet pipe of one of the pneumatic switching valves via a T-junction, and pressure switch II is connected to the air inlet pipe of the other pneumatic switching valve via a T-junction. Pressure switch I is normally open, and pressure switch II is normally closed. The common terminal of pressure switch I and pressure switch II is directly connected. The normally closed contact of pressure switch II is connected to the negative terminal of the power supply. The normally open contact of pressure switch I is connected to one terminal of the light alarm. The other terminal of the light alarm is connected to the positive terminal of the power supply via a fuse. The light alarm is installed near the driller's box for easy observation by the driller.

[0008] Furthermore, the power source is a DC24V power supply for the well repair vehicle.

[0009] This invention offers the following advantages: By adopting the above technical solution, this invention installs a mechanism on the original manual single-gate blowout preventer cover to control the on / off of the air supply circuit of the workover truck combination valve. This achieves the interlocking of the manual single-gate blowout preventer with the workover truck winch clutch. Only when both gates of the manual single-gate blowout preventer are fully opened can the air supply circuit of the workover truck combination valve be connected, and the workover truck winch clutch be engaged, thus preventing safety accidents. In addition to achieving the interlocking of the manual single-gate blowout preventer with the workover truck winch clutch, this invention also adds a light alarm function. The flashing alarm light reminds on-site personnel that at least one side of the manual blowout preventer is not fully opened. The alarm light is installed near the driller's box, providing a very clear reminder to the driller. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the control mechanism for switching on and off the air supply circuit of the combination valve according to the present invention.

[0012] Figure 2 This is a schematic diagram of the gas alarm circuit of the present invention.

[0013] Figure 3 This is a schematic diagram of the structure of the manual single-gate blowout preventer cover of the present invention.

[0014] Figure 4 This is a schematic diagram of the locking cap of the manual single-gate blowout preventer of the present invention.

[0015] Figure 5 This is a half-sectional view of the threaded drive section of a manual single-gate blowout preventer.

[0016] Figure 6 This is a schematic diagram illustrating the application of the present invention. Implementation

[0017] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of the present invention.

[0018] exist Figure 1 and Figure 2This invention provides a safety device for preventing the breakage of a manual single-gate blowout preventer. It includes two sets of control mechanisms for switching the air supply circuit of a combined valve and an air circuit alarm circuit. The two control mechanisms for switching the air supply circuit of the combined valve are respectively installed on the two covers 20 of the manual single-gate blowout preventer. Each control mechanism for switching the air supply circuit of the combined valve includes a clamp assembly 1 and an actuator. The clamp assembly 1 is fixedly fitted onto the cover 20. The actuator includes a drive device and a pneumatic switching valve 2. The drive device is located between the pneumatic switching valve 2 and the cover 20 of the manual single-gate blowout preventer. One end of the drive device passes through the clamp assembly 1 and extends into the long groove 2001 on the surface of the cover 20, contacting the gate shaft end face 2301 inside the cover 20. The other end of the drive device is connected to the pneumatic switch valve 2. The valve cores of the switching valves 2 correspond to each other. Two pneumatic switching valves 2 are connected in series to the air supply circuit of the combination valve of the well workover rig winch clutch. An air circuit alarm circuit 9 is connected to the air inlet pipe of each pneumatic switching valve 2. Each drive device in this embodiment includes a lever 3 and a pin 4. The lever 3 and the pneumatic switching valve 2 are arranged side by side. Mounting plate I 104 and mounting plate II 105 are respectively provided on the upper and lower parts of the pneumatic switching valve 2. Mounting plate I 104 and mounting plate II 105 are the same size and parallel to each other. One end of mounting plate I 104 and one end of mounting plate II 105 are fixed on the outer surface of the arc of the clamp assembly 1. The pneumatic switching valve 2 is fixedly installed in the interlayer between mounting plate I 104 and mounting plate II 105. In this embodiment, the pneumatic switching valve 2 is connected from top to bottom by screw III 5. After passing through mounting plate I 104, pneumatic switch valve 2, and mounting plate II 105 in sequence, the pin is secured by nut III 6. Adjustment devices are installed at the other ends of mounting plate I 104 and mounting plate II 105. The pin 4 passes through mounting plate I 104, lever 3, and mounting plate II 105 from top to bottom, and then the lever 3 is installed in the interlayer. The lever 3 rotates around the pin 4. The bent end of one end of the lever 3 is close to the head of the valve core of the pneumatic switch valve 2. The straight end of the other end of the lever 3 passes through the clamp assembly 1 and extends into the long groove 2001 provided on the protective cover 20, contacting the gate shaft end face 2301 inside the protective cover 20. In this embodiment, the clamp assembly 1 includes a left half-clamp body 101 and a right half-clamp body 102, both of which are semi-circular. The left half of the hoop 101 is connected to the corresponding right half of the hoop 102 at both ends by screw I and nut I to form a circular hoop assembly 1. One end of mounting plate I 104 and one end of mounting plate II 105 are fixed to the outer arc surface of the right half of the hoop 102. A stiffening plate I 106 is welded between the upper part of the outer arc surface of the right half of the hoop 102 and mounting plate I 104, and a stiffening plate II 107 is welded between the lower part of the outer arc surface of the right half of the hoop 102 and mounting plate II 105. The stiffening plates I 106 and II 107 are flush with the end face of the right half of the hoop 102. The straight end of the other end of the lever 3 passes through the arc surface of the right half of the hoop 102 and extends into the long groove 2001 provided on the protective cover 20, contacting the end face 2301 of the gate shaft inside the protective cover 20.In this embodiment, a stop pin 103 is fixedly welded to the inner arc surface of the right half of the hoop 102. The stop pin 103 and the right half of the hoop 102 are welded together to form an integral whole. The stop pin 103 is used to prevent relative movement between the hoop assembly 1 and the protective cover 20. The adjustment device in this embodiment includes an adjusting nut II7 and an adjusting screw II8. The adjusting nut II7 is fixed to the other end face of the mounting plate I 104 and the other end face of the mounting plate II 105. The adjusting screw II8 passes through the adjusting nut II7 and corresponds to the pneumatic switch valve 2. Rotating the adjusting screw II8 pushes the pneumatic switch valve 2 to move, which can adjust the gap between the pneumatic switch valve 2 and the bent end of the lever 3. The air circuit alarm circuit in this embodiment includes a pressure switch I 91 and a pressure switch II 92. The system includes components Ⅱ92, power supply 93, fuse 94, and light alarm 95. Pressure switch Ⅰ91 is connected via a tee to the air inlet pipe of one of the pneumatic switch valves 2, and pressure switch Ⅱ92 is connected via a tee to the air inlet pipe of the other pneumatic switch valve 2. Pressure switch Ⅰ91 is normally open, and pressure switch Ⅱ92 is normally closed. The common terminal of pressure switches Ⅰ91 and Ⅱ92 is directly connected. The normally closed contact of pressure switch Ⅱ92 is connected to the negative terminal of power supply 93. The normally open contact of pressure switch Ⅰ91 is connected to one terminal of light alarm 95, and the other terminal of light alarm 95 is connected to the positive terminal of power supply 93 via fuse 94. Light alarm 95 is installed near the driller's box for easy observation by the driller. Power supply 93 is a DC 24V power supply for the workover vehicle.

[0019] exist Figure 3 , Figure 4 and Figure 5 In this embodiment, when the screw 22 of the manual single-gate blowout preventer is rotated, looking inward from the long slot 2001 of the cover, the gate shaft 23 can be seen moving inside the cover 20. When the manual single-gate blowout preventer is fully open, the gate shaft 23 will move to the outermost position. As long as this position information can be obtained, it can be used to control the on / off of the air supply to the combination valve, thereby realizing the interlock between the manual single-gate blowout preventer and the workover rig winch clutch. When the manual blowout preventer is fully open, the long slot 2001 is lengthened towards the locking cap 21. When the blowout preventer is fully open, the end 2301 of the gate shaft can be exposed. The length of the locking cap 21 is shortened, and the unthreaded part on the outside of the locking cap 21 is cut off. After the length is shortened, the threaded connection strength between the locking cap 21 and the blowout preventer cover 20 is not affected, thus leaving room for the installation position of the lever 3.

[0020] During use, when the manual single-gate blowout preventer is fully open, the gate end face of the gate shaft presses down the valve core of the pneumatic switch valve 2 through the elbow end of the drive lever 3. At this time, the air inlet and outlet of the pneumatic switch valve 2 are connected, the air supply circuit of the workover rig winch clutch is normal, the air supply circuit of the workover rig winch clutch can achieve normal air supply, the light alarm 95 will not issue an alarm message, and the tubing can be pulled up. When one or two gates of the manual single-gate blowout preventer are not fully open, the gate shaft end face fails to drive the lever 3 to move, the valve core of the pneumatic switch valve 2 extends under the action of the spring, the air inlet and outlet of the pneumatic switch valve 2 are not connected, the air supply circuit of the workover rig winch clutch is cut off, the air supply circuit of the workover rig winch clutch cannot achieve normal air supply, the winch clutch has no air pressure and cannot be engaged, the tubing cannot be pulled up, at the same time, the light alarm 95 flashes to issue an alarm message to remind the driller.

[0021] exist Figure 6 In this invention, the manual single-gate blowout preventer with anti-breakage safety device is used in the same way as the ordinary manual single-gate blowout preventer. Before construction, the manual single-gate blowout preventer with two clamp assemblies 1 is installed at the wellhead. Then, two air lines are connected, and two pneumatic switch valves 2 are connected in series to the air supply circuit of the workover vehicle combination valve. With both gates of the manual blowout preventer fully open, the workover truck winch clutch operates normally, and the hose reel is unaffected. The air supply from the exhaust manual two-position three-way valve 10 is directly supplied to the combination valve relay 11 via the two pneumatic switch valves 2, ensuring normal air supply to the combination valve. If one or two gates are not fully open, the warning light 95 will flash, and the workover truck winch clutch will be unable to engage due to lack of air pressure, preventing hose reel ...

[0022] During sand flushing operations, it is often necessary to raise and lower the tubing while the manual single-gate blowout preventer (BOP) is closed. To avoid affecting normal sand flushing, this invention adds a shut-off valve 12 and a check valve 13 to the air supply circuit of the combination valve. After the shut-off valve 12 is opened, the air supply to the combination valve is not affected by the BOP closure and the tubing can still be raised and lowered normally. However, the light alarm 95 keeps flashing, constantly reminding the driller that the BOP is not open. The air supply process of the combination valve is as follows: air source from the exhaust manual two-position three-way valve 10, shut-off valve 12, combination valve, and main drum combination valve 14 are all supplied normally. Since the BOP is not fully open, the pneumatic switch valve 2 cuts off the air supply and expels the compressed air in the pipeline.

[0023] Not limited to this, any variation or substitution conceived without inventive effort should be included within the scope of protection of this invention patent. Therefore, the scope of protection of this invention patent should be determined by the scope defined in the claims.

Claims

1. A manually operated single ram preventer anti-lift safety device, characterized by It includes two sets of control mechanisms for combining valve supply circuit on-off and gas circuit alarm circuit, the two sets of control mechanisms for combining valve supply circuit on-off are respectively installed on the two shrouds (20) of the manual single ram preventer, each control mechanism for combining valve supply circuit on-off includes a hoop assembly (1) and an execution component, the hoop assembly (1) is fixedly sleeved on the shroud (20), the execution component includes a driving device and a pneumatic on-off valve (2), the driving device is located between the pneumatic on-off valve (2) and the shroud (20) of the manual single ram preventer, one end of the driving device penetrates through the hoop assembly (1) and extends into the long groove (2001) on the surface of the shroud (20) and is in contact with the ram shaft end face (2301) in the shroud (20), the other end of the driving device corresponds to the valve core of the pneumatic on-off valve (2), the two pneumatic on-off valves (2) are connected in series to the combined valve supply circuit of the well servicing truck winch clutch, the gas circuit alarm circuit (9) is connected to the air inlet pipeline of each pneumatic on-off valve (2), each driving device includes a lever (3) and a pin shaft (4), the lever (3) and the pneumatic on-off valve (2) are arranged side by side, the upper part and the lower part of the pneumatic on-off valve (2) are respectively provided with a mounting plate I (104) and a mounting plate II (105), the mounting plate I (104) and the mounting plate II (105) are the same size and parallel to each other, one end of the mounting plate I (104) and one end of the mounting plate II (105) are fixed on the outer surface of the arc of the hoop assembly (1), the pneumatic on-off valve (2) is fixedly installed in the interlayer between the mounting plate I (104) and the mounting plate II (105), the other end of the mounting plate I (104) and the other end of the mounting plate II (105) are provided with adjusting devices, the pin shaft (4) penetrates through the mounting plate I (104), the lever (3) and the mounting plate II (105) from top to bottom and then installs the lever (3) in the interlayer, the lever (3) rotates around the pin shaft (4), the elbow end of one end of the lever (3) abuts against the head of the valve core of the pneumatic on-off valve (2), the straight end of the other end of the lever (3) penetrates through the hoop assembly (1) and extends into the long groove (2001) provided on the shroud (20) and is in contact with the ram shaft end face (2301) in the shroud (20), the hoop assembly (1) includes a left half hoop body (101) and a right half hoop body (102), the left half hoop body (101) and the right half hoop body (102) are both arranged in a semicircular shape, the two ends of the left half hoop body (101) are respectively connected to the two ends of the corresponding right half hoop body (102) through the cooperation of the screw rod I and the nut I to form a circular hoop assembly (1), one end of the mounting plate I (104) and one end of the mounting plate II (105) are fixed on the outer surface of the arc of the right half hoop body (102), a rib plate I (106) is arranged between the upper part of the outer surface of the arc of the right half hoop body (102) and the mounting plate I (104), a rib plate II (107) is arranged between the lower part of the outer surface of the right half hoop body (102) and the mounting plate II (105), the rib plate I (106) and the rib plate II (107) are flush with the end face of the right half hoop body (102),The straight end of the other end of the lever (3) penetrates into the long slot (2001) provided on the shroud (20) through the circular arc surface of the right half hoop body (102) and contacts the gate shaft end face (2301) in the shroud (20).

2. The manual single ram preventer lift-off safety device of claim 1, wherein The circular arc inner surface of the right half hoop body (102) is fixedly welded with a stop pin (103), which is used for preventing relative movement between the hoop assembly (1) and the guard (20).

3. The manual single ram preventer lift-off safety device of claim 1, wherein The adjusting device comprises an adjusting nut II (7) and an adjusting screw II (8), the adjusting nut II (7) is fixed on the other end face of the mounting plate I (104) and the other end face of the mounting plate II (105), the adjusting screw II (8) penetrates into the adjusting nut II (7) and corresponds to the pneumatic switch valve (2), and the gap between the pneumatic switch valve (2) and the elbow end of the lever (3) can be adjusted by rotating the adjusting screw II (8) to push the pneumatic switch valve (2) to move.

4. The manual single ram preventer lift-off safety device of claim 1, wherein The air path alarm circuit comprises a pressure switch I (91), a pressure switch II (92), a power supply (93), a fuse (94) and a light alarm (95), the pressure switch I (91) is connected in the air inlet pipeline of one of the pneumatic switch valves (2) through a tee joint, the pressure switch II (92) is connected in the air inlet pipeline of the other pneumatic switch valve (2) through a tee joint, the pressure switch I (91) is a normally open connection, the pressure switch II (92) is a normally closed connection, the common end of the pressure switch I (91) and the pressure switch II (92) is directly connected, the normally closed contact of the pressure switch II (92) is connected with the negative electrode of the power supply (93), the normally open contact of the pressure switch I (91) is connected with one terminal of the light alarm (95), the other terminal of the light alarm (95) is connected with the positive electrode of the power supply (93) through the fuse (94), and the light alarm (95) is installed near the driller's box for the driller to observe.

5. The manual single ram preventer lift-off safety device of claim 4, wherein The power supply (93) is a DC 24V direct current power supply of the workover truck.

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