A rotary blowout preventer rubber core suitable for composite drilling tools

Abstract

The present application relates to the technical field of rotary blowout preventer rubber cores, and in particular to a rotary blowout preventer rubber core suitable for composite drilling tools, comprising an annular frame, an annular rubber core is installed on the inner wall of the annular frame, an annular groove matched with the annular rubber core is provided inside the annular frame, an adjusting mechanism for adjusting the position of the annular rubber core is installed inside the annular groove, the annular rubber core is driven to move upward during the upward movement of the adjusting block, and the annular rubber core is synchronously clamped with the drill pipe during the upward movement due to the inclined slope guidance and the blocking of the top of the annular frame. Compared with the traditional multi-point clamping method of the drill pipe, the annular rubber core and the adjusting block cooperate with each other to fully clamp the drill pipe, reduce the possibility of uneven clamping force on the drill pipe due to gaps between points in the multi-point clamping method, improve the clamping degree between the annular rubber core and the drill pipe, and have a better sealing effect on the bottom hole liquid.

Description

Technical Field

[0001] The present application relates to the technical field of a rotary blowout preventer rubber core, and in particular to a rotary blowout preventer rubber core suitable for a composite drilling tool. Background Art

[0002] The blowout preventer rubber core is an important component of the blowout preventer. This type of rubber core is usually made of soft rubber or similar materials. It is used to prevent blowouts during oil development and geological drilling. It usually plays a sealing role in oil well blowout preventers. In the actual working process, it uses the control system to hold drill pipes and downhole tools of various specifications, seal the wellhead, and prevent oil and gas spraying. It is generally made of NBR and produced by molding.

[0003] For example, the patent application with the publication number CN220929342U discloses a spherical rubber core suitable for a rotary blowout preventer, including a rubber body and a rigid support body arranged around the rubber body, and also including a supporting mechanism, which is arranged at the lower part of the rubber body, with one end against the rubber body and the other end connected to a push piston in the blowout preventer; the push piston acts on the supporting mechanism when it moves upward, and the supporting mechanism moves radially along the rubber body to push the lower part of the rubber body radially outward. The spherical rubber core of the prior art clamps the drill pipe in layers during the upward process, and the upper and lower parts of the rubber core can be in close contact with the drill pipe to achieve a better sealing effect.

[0004] However, the above-mentioned prior art still has some defects when using the blowout preventer rubber core: there is a gap between the rigid support bodies set in the above-mentioned patent application, so the second top support rod only acts on the rubber body at a single point, resulting in uneven force on the part of the rubber body located between adjacent second top support rods when acting on the drill pipe, resulting in different contact tightness between the rubber body and the drill pipe, affecting the sealing effect of the spherical rubber core.

[0005] Based on this, under the above-mentioned viewpoints, the existing technology of using the blowout preventer rubber core still has room for improvement. Summary of the invention

[0006] In order to solve the above technical problems, the present application provides a rotary blowout preventer rubber core suitable for composite drilling tools, adopting the following technical solution: a rotary blowout preventer rubber core suitable for composite drilling tools, comprising an annular frame, an annular rubber core is installed on the inner wall of the annular frame, an annular groove matching the annular rubber core is opened inside the annular frame, and an adjustment mechanism for adjusting the position of the annular rubber core is installed inside the annular groove.

[0007] The adjustment mechanism includes: two annular plates arranged along the middle of the annular frame toward its side, installed at the bottom of the annular groove, and the height of the annular plate close to the annular rubber core is lower than the height of the annular plate away from the annular rubber core.

[0008] The adjusting block is arranged inside the annular groove and is an annular structure coaxial with the annular frame. It moves along the height direction of the annular frame and slides with the annular plate. An inclined surface matching the annular rubber core is arranged on one side close to the annular rubber core.

[0009] The adjusting component is arranged on the adjusting block and matched with the annular rubber core.

[0010] Preferably, the annular rubber core is divided into two sections, an outer wall of the annular rubber core close to the top of the annular frame is set as an inclined structure cooperating with the adjustment block, an end of the annular rubber core close to the bottom of the annular frame is set as an annular structure cooperating with the adjustment component, and a plurality of annular rubber strips are evenly arranged on the inner wall of the annular rubber core along its height direction.

[0011] Preferably, an annular groove is provided on the top of one side of the regulating block away from the annular rubber core, and the annular groove is in close contact with the side wall of the annular groove, and an oil inlet pipe which is connected with the annular groove and is arranged obliquely is installed on the outer side wall of the annular frame.

[0012] The adjusting block, the bottom of the annular groove and the two annular plates together form annular groove No. 2. An oil inlet pipe No. 2 connected to the annular groove is also installed on the outer wall of the annular frame. The end of the oil inlet pipe No. 2 close to the annular rubber core passes through the annular plate away from the annular rubber core and is arranged inside the annular groove No. 2.

[0013] Preferably, the adjustment component includes a plurality of evenly distributed through grooves extending along the circumference of the adjustment block, and a push rod is provided inside the through grooves. A push block slidably arranged inside the through groove is installed at the end of the push rod away from the annular rubber core, and a tightening block is installed at the end of the push rod close to the annular rubber core. A return spring is sleeved on the push rod, one end of the return spring is installed on the push block, and the other end of the return spring is installed on the inner wall of the through groove.

[0014] Preferably, an annular baffle plate sliding along the height direction is arranged on the outer side wall of the adjustment block, and the annular baffle plate cooperates with the through groove to separate the through groove and the second annular groove from each other.

[0015] Preferably, the adjusting block is provided with two symmetrically distributed adjusting rods, and the adjusting rods extend along the height direction of the adjusting block and are slidably arranged on the adjusting block, one end of the adjusting rod close to the bottom of the annular groove is installed on the annular baffle, and the end of the adjusting rod away from the annular baffle is installed with a cylindrical block, and a return spring is sleeved on the adjusting rod, one end of the return spring is installed on the top of the adjusting block, and the other end of the return spring is installed on the cylindrical block.

[0016] Preferably, the upper half of the annular frame is provided with a plurality of inclined sliding grooves, a resisting rod is provided inside the sliding groove, an annular circular groove is provided inside the annular frame, and the sliding groove is connected with the annular circular groove.

[0017] Preferably, a plurality of evenly distributed gas cylinders are arranged on the top of the annular frame, a plurality of transition grooves corresponding to the gas cylinders are opened inside the annular frame, one end of the transition groove away from the gas cylinder is connected to the annular circular groove, and the gas outlet of the gas cylinder is connected to the transition groove.

[0018] Preferably, a plurality of balls matching with the annular rubber core are evenly installed on the inclined surface of the adjustment block along its circumference.

[0019] Preferably, a second pressure sensor for monitoring the bottom hole liquid pressure is also installed on the top of the annular frame.

[0020] In summary, the present application includes at least one of the following beneficial technical effects:

[0021] 1. In the adjustment mechanism designed in the present invention, the annular rubber core is driven to move upward during the upward movement of the adjustment block. Due to the guidance of the inclined slope and the blocking of the top of the annular frame, the annular rubber core is synchronously clamped with the drill pipe during the upward movement. Compared with the traditional multi-point clamping method of the drill pipe, the annular rubber core and the adjustment block cooperate with each other to fully clamp the drill pipe, reducing the possibility of uneven clamping force on the drill pipe due to gaps between points in the multi-point clamping method, improving the clamping degree between the annular rubber core and the drill pipe, and having a better sealing effect on the bottom hole liquid.

[0022] 2. In the adjusting assembly designed by the present invention, when the bottom hole liquid pressure is too large, in order to ensure that the annular rubber core can sufficiently balance the bottom hole liquid pressure, the pushing block drives the clamping block to move through the pushing rod during the movement of the pushing block inside the corresponding pipe groove, and the clamping block can perform a secondary clamping on the annular rubber core, thereby further improving the clamping degree between the annular rubber core and the drill pipe.

[0023] 3. The resistance rod designed in the present invention can apply external force to the annular rubber core again during the movement process to balance the force on the annular frame in the vertical direction during the upward movement of the annular rubber core, thereby avoiding excessive force on the top of the annular frame causing it to break and increasing its service life. At the same time, the resistance rod can give the annular rubber core a force in the direction of the drill pipe, further increasing the degree of clamping between the annular rubber core and the drill pipe, so that the annular rubber core has a better sealing effect on the bottom hole liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0025] Figure 2 It is a three-dimensional cross-sectional view of the present invention.

[0026] Figure 3 The present invention Figure 2 A partial view of the .

[0027] Figure 4 The present invention Figure 3A partial enlarged view of point A.

[0028] Figure 5 The present invention Figure 4 A partial enlarged view of point D.

[0029] Figure 6 The present invention Figure 2 A partial view of the .

[0030] Figure 7 The present invention Figure 6 A partial enlarged view of point B.

[0031] Figure 8 The present invention Figure 6 A partial enlarged view of point C.

[0032] Fig. 9 It is a schematic diagram of the three-dimensional structure of the adjustment block of the present invention.

[0033] Fig.10 It is an electrical flow chart of the present invention.

[0034] Explanation of the reference numerals in the accompanying drawings: 1. annular frame; 11. abutment rod; 12. annular circular groove; 13. air cylinder; 14. transition groove; 15. pressure sensor 2; 2. annular rubber core; 21. annular rubber strip; 22. annular groove 1; 23. oil inlet pipe 1; 24. annular groove 2; 25. oil inlet pipe 2; 3. annular groove; 4. adjusting mechanism; 41. annular plate; 42. adjusting block; 421. adjusting connecting rod; 422. cylindrical block; 423. return spring; 424. ball; 43. adjusting assembly; 431. pushing rod; 432. pushing block; 433. pressing block; 434. reset spring; 435. annular baffle. DETAILED DESCRIPTION

[0035] The following is combined with Figures 1 to 10 This application is described in further detail.

[0036] The embodiment of the present application discloses a rotary blowout preventer rubber core suitable for composite drilling tools, which can fully cover and clamp the circumferential surface of an existing drill pipe; and then perform multiple clamping treatments on the drill pipe in a variety of ways.

[0037] Embodiment 1:

[0038] Reference Figure 1 and Figure 2 A rotary blowout preventer rubber core suitable for composite drilling tools comprises an annular frame 1, an annular rubber core 2 is installed on the inner wall of the annular frame 1, an annular groove 3 matching the annular rubber core 2 is opened inside the annular frame 1, and an adjusting mechanism 4 for adjusting the position of the annular rubber core 2 is installed inside the annular groove 3.

[0039] The adjusting mechanism 4 includes: two annular plates 41 arranged along the middle of the annular frame 1 to its side, installed at the bottom of the annular groove 3, and the height of the annular plate 41 close to the annular rubber core 2 is lower than the height of the annular plate 41 away from the annular rubber core 2.

[0040] The adjusting block 42 is arranged inside the annular groove 3 and is an annular structure coaxial with the annular frame 1. It moves along the height direction of the annular frame 1 and slidably cooperates with the annular plate 41. The side close to the annular rubber core 2 is provided with an inclined surface that cooperates with the annular rubber core 2.

[0041] The adjusting component 43 is disposed on the adjusting block 42 and matched with the annular rubber core 2 .

[0042] The annular rubber core 2 is driven upward by the adjusting block 42 during the upward movement. Due to the guidance of the inclined slope and the blocking of the top of the annular frame 1, the annular rubber core 2 is synchronously clamped with the drill pipe during the upward movement. Compared with the traditional multi-point clamping method of the drill pipe, the annular rubber core 2 and the adjusting block 42 cooperate with each other to increase the contact area with the drill pipe, so that the drill pipe can be fully clamped, and the possibility of uneven clamping force on the drill pipe due to gaps between points in the multi-point clamping method is reduced, the clamping degree between the annular rubber core 2 and the drill pipe is improved, and the sealing effect on the bottom hole liquid is better.

[0043] Reference Figure 2 The annular rubber core 2 is divided into two sections. An outer wall of the annular rubber core 2 close to the top of the annular frame 1 is set as an inclined structure that cooperates with the adjustment block 42. An end of the annular rubber core 2 close to the bottom of the annular frame 1 is set as an annular structure that cooperates with the adjustment component 43. A plurality of annular rubber strips 21 are evenly arranged on the inner wall of the annular rubber core 2 along its height direction.

[0044] Reference Figure 3 and Figure 4 An annular groove 22 is arranged on the top of the side of the adjusting block 42 away from the annular rubber core 2, and the annular groove 22 is in close contact with the side wall of the annular groove 3, and an oil inlet pipe 23 which is connected with the annular groove 22 and is arranged obliquely is installed on the outer side wall of the annular frame 1.

[0045] The adjusting block 42, the bottom of the annular groove 3 and the two annular plates 41 together form an annular groove 24. An oil inlet pipe 25 connected to the annular groove 3 is also installed on the outer wall of the annular frame 1. The end of the oil inlet pipe 25 close to the annular rubber core 2 passes through the annular plate 41 away from the annular rubber core 2 and is arranged inside the annular groove 24.

[0046] Prepare two existing oil pumps, and connect the two oil pump outlets to the oil inlet pipe 1 23 and the oil inlet pipe 2 25 respectively, and then connect the oil pump inlet to the existing oil source. In order to ensure the sealing between the various components of the present invention and the hydraulic oil, all the two components in contact with the hydraulic oil are treated with hydraulic oil leakage prevention. During specific operation, the diameter of the annular rubber strip 21 should be slightly smaller than the diameter of the drill pipe, and the annular rubber core 2 is placed directly above the existing drill pipe, and then an external force is applied to the annular frame 1 so that the annular rubber core 2 is sleeved on the drill pipe. At this time, since the diameter of the annular rubber strip 21 is slightly smaller than the diameter of the drill pipe, the friction between the annular rubber strip 21 and the drill pipe can be achieved through the cooperation of the annular rubber core 2 and the outer wall of the drill pipe, so that the annular frame 1 is attached to the outer wall of the drill pipe, avoiding the tediousness of holding the annular frame 1.

[0047] At the same time, the annular rubber strip 21 increases the friction between the annular rubber core 2 and the drill rod when the annular rubber core 2 is against the drill rod, so as to reduce the possibility of relative sliding of the annular rubber core 2 on the drill rod along the length direction of the drill rod.

[0048] After the annular frame 1 and the annular rubber core 2 are placed, the oil pump matched with the oil inlet pipe 25 is started. At this time, the oil pump is started to pump the hydraulic oil into the annular groove 24. As the hydraulic oil fills the annular groove 24, the hydraulic oil continues to be pumped into the annular groove 24. At this time, due to the increase of hydraulic oil, in order to make way for the excess hydraulic oil pumped into the annular groove 24, the adjusting block 42 moves up along the inner wall of the annular groove 3 and the annular plate 41. The adjusting block 42 moves up and contacts the side wall of the annular rubber core 2 first. When the adjusting block 42 contacts the side wall of the annular rubber core 2, the inclined surface on the adjusting block 42 drives the annular rubber core 2 to move up and drives the annular rubber core 2 to move toward the drill pipe. The annular rubber core 2 holds the drill pipe tightly during the movement toward the drill pipe. At the same time, due to the obstruction of the top of the annular frame 1, the annular rubber core 2 is deformed during the collision with the top of the annular frame 1, so that the annular rubber core 2 also moves toward the drill pipe synchronously. Then, due to the obstruction of the annular frame 1, the top of the annular rubber core 2 can also hold the drill pipe tightly.

[0049] The annular plate 41 can not only guide the adjusting block 42 , but also form an annular groove 22 together with the adjusting block 42 and the annular groove 3 .

[0050] When the bottom hole pressure is too high, in order to reduce the possibility that the annular rubber core 2 may slide relative to the drill pipe due to insufficient pressure of the adjusting block 42 against the annular rubber core 2, resulting in poor sealing effect on the bottom hole liquid, the adjusting component 43 provided by the present invention cooperates with the annular structure of the annular rubber core 2 to further increase the sealing effect between the annular rubber core 2 and the drill pipe.

[0051] Reference Figures 6 to 9Specifically, the adjustment component 43 includes a plurality of evenly distributed through grooves extending along the circumference of the adjustment block 42, and a push rod 431 is arranged inside the through groove. A push block 432 slidably arranged inside the through groove is installed at one end of the push rod 431 away from the annular rubber core 2, and a tightening block 433 is installed at one end of the push rod 431 close to the annular rubber core 2. A return spring 434 is sleeved on the push rod 431, and one end of the return spring 434 is installed on the push block 432, and the other end of the return spring 434 is installed on the inner wall of the through groove.

[0052] An annular baffle 435 sliding along the height direction is provided on the outer wall of the adjusting block 42, and the annular baffle 435 cooperates with the through groove to separate the through groove and the annular groove 24 from each other. If the annular baffle 435 is not provided, that is, the annular groove 24 is in direct contact with the through groove and the annular groove 24, after the hydraulic oil passes through the through groove, the pressure of the hydraulic oil directly pushes the rod 431 to move and presses the annular rubber core 2 through the pressing block 433, causing the bottom of the annular rubber core 2 to be locked, affecting its subsequent deformation effect, thereby affecting the fit and friction between the annular rubber core 2 and the drill pipe.

[0053] Two symmetrically distributed adjusting links 421 are provided on the adjusting block 42, and the adjusting links 421 extend along the height direction of the adjusting block 42 and are slidably arranged on the adjusting block 42. One end of the adjusting link 421 close to the bottom of the annular groove 3 is installed on the annular baffle 435, and one end of the adjusting link 421 away from the annular baffle 435 is installed with a cylindrical block 422. A return spring 423 is sleeved on the adjusting link 421, one end of the return spring 423 is installed on the top of the adjusting block 42, and the other end of the return spring 423 is installed on the cylindrical block 422.

[0054] During specific operation, in order to increase the friction and sealing effect between the annular rubber core 2 and the drill pipe, it is necessary to continuously pump hydraulic oil into the annular groove 24. As the hydraulic oil gradually increases, the adjusting block 42 continues to move upward. When the cylindrical block 422 contacts the top of the annular groove 3 and continues to move, due to the obstruction of the top of the annular frame 1, the cylindrical block 422 drives the adjusting connecting rod 421 to move downward. At this time, the return spring 423 contracts, and the adjusting connecting rod 421 drives the annular baffle 435 to move downward during the downward movement.

[0055] When the annular baffle 435 is offset from the through groove, the hydraulic oil enters the through groove. At this time, the deformation of the annular rubber core 2 reaches the maximum, so the adjusting block 42 no longer moves due to the obstruction of the annular rubber core 2. At this time, the excess hydraulic oil enters the through groove, and the hydraulic oil drives the pushing block 432 to move. During the movement of the pushing block 432, the pushing rod 431 drives the clamping block 433 to move. During the movement of the clamping block 433, the annular structure of the annular rubber core 2 is abutted. At this time, the return spring 423 is compressed, and the clamping block 433 can clamp the annular rubber core 2 for a second time, thereby further improving the clamping degree between the annular rubber core 2 and the drill pipe.

[0056] A pressure sensor 1 (not shown in the figure) is arranged inside the annular groove 24. The pressure inside the annular groove 24 can be determined based on the real-time data transmitted by the pressure sensor 1. If the pressure inside the annular groove 24 reaches the warning load, the oil pump matched with the oil inlet pipe 25 is closed. At this time, the annular rubber core 2 is tightly fitted with the drill pipe.

[0057] Reference Figure 5 The upper half of the annular frame 1 is provided with a plurality of inclined sliding grooves, and a resisting rod 11 is provided inside the sliding groove for abutting against the annular rubber core 2. An annular circular groove 12 is provided inside the annular frame 1, and the sliding groove is connected with the annular circular groove 12 through-connection.

[0058] A plurality of evenly distributed gas cylinders 13 are arranged at the top of the annular frame 1, and a plurality of transition grooves 14 corresponding to the gas cylinders 13 are opened inside the annular frame 1. One end of the transition groove 14 away from the gas cylinder 13 is connected to the annular circular groove 12, and the gas outlet of the gas cylinder 13 is connected to the transition groove 14.

[0059] The telescopic end of the gas cylinder 13 can be automatically reset, and the automatic reset component is an existing spring. Since this technology is existing common knowledge, it will not be described in detail (nor shown in the figure). When the adjusting block 42 drives the cylindrical block 422 to abut against the annular frame 1 through the adjusting connecting rod 421, the telescopic end of the gas cylinder 13 abuts against the top of the adjusting block 42. At this time, the telescopic end of the gas cylinder 13 pumps gas into the transition groove 14 through the gas outlet from top to bottom. The gas enters the annular groove 12 through the transition groove 14. The gas enters the sliding groove during the flow of the annular groove 12. The gas slides in the sliding groove. During the movement inside the movable groove, the resistance rod 11 is driven to move toward one side of the annular rubber core 2. During the movement of the resistance rod 11, an external force can be applied to the annular rubber core 2 again to balance the force on the annular frame 1 in the vertical direction during the upward movement of the annular rubber core 2, thereby avoiding excessive force on the top of the annular frame 1, which may cause it to break and increase its service life. At the same time, the resistance rod 11 can give the annular rubber core 2 a force in the direction of the drill pipe, so that the annular rubber core 2 has a tendency to move in the direction of the drill pipe, and the degree of clamping between the annular rubber core 2 and the drill pipe is further increased, so that the annular rubber core 2 has a better sealing effect on the bottom hole liquid.

[0060] The abutment rod 11 and the inside of the sliding groove have been sealed, that is, the gas inside the sliding groove will not be discharged to the outside through the gap between the abutment rod 11 and the sliding groove.

[0061] Reference Fig. 9 A plurality of balls 424 matching with the annular rubber core 2 are evenly installed on the inclined surface of the adjusting block 42 along its circumference.

[0062] The ball 424 reduces friction during the movement of the adjusting block 42 , thereby preventing the adjusting block 42 from being unable to move on the surface of the annular rubber core 2 due to excessive friction between the adjusting block 42 and the annular rubber core 2 .

[0063] When the drilling rod work is finished, the oil pump matched with the oil inlet pipe 23 is started to pump hydraulic oil into the annular groove 22. When the hydraulic oil enters the annular groove 22, it gives a downward force to the adjusting block 42, so that the adjusting block 42 moves downward. At this time, the oil pump matched with the oil inlet pipe 25 pumps out the hydraulic oil in the annular groove 24. The hydraulic oil pumped into the annular groove 22 cooperates with the hydraulic oil pumped out of the annular groove 24. At this time, the adjusting block 42 moves down and resets. At this time, all the components of the present invention are reset to the starting position.

[0064] Replay Figure 1 A pressure sensor 15 for monitoring the bottom hole liquid pressure is also installed on the top of the annular frame 1.

[0065] Therefore, the above-mentioned abutment rod 11, the abutment block 433 and the adjustment block 42 cooperate with each other to seal the annular rubber core 2, thereby improving the degree of sealing of the annular rubber core 2 on the drill pipe, and the reliability of the annular rubber core 2 is higher.

[0066] Embodiment 2:

[0067] Reference Fig.10 On the basis of the first embodiment, in order to improve the intelligence level of the present invention, the present invention further provides a central control component, which is electrically connected to the pressure sensor 1, the pressure sensor 2 15 and the oil pump, wherein the central control component includes a central control panel arranged on the annular frame 1, buttons arranged on the central control panel and a central control unit arranged inside the central control panel, wherein the central control unit includes a central control module, a button control module electrically connected to the central control module, a pump control module electrically connected to the central control module and a pressure sensor module electrically connected to the central control module.

[0068] The pump control module is electrically connected to the oil pump, and the pressure sensing module is electrically connected to the pressure sensor 1 and the pressure sensor 2 15 .

[0069] During specific operation, after the annular frame 1 is installed on the drill pipe through the annular rubber core 2, the button is pressed, the button control module receives the button-open signal and transmits the signal to the central control module. At this time, the central control module is turned on. When the pressure sensor 15 receives the bottom hole liquid pressure signal and transmits the signal to the pressure sensing module, the pressure sensing module processes the received signal and transmits it to the central control module. The central control module receives and processes the signal and transmits it to the pump control module. After receiving the signal, the pump control module processes the signal and transmits it to the oil pump corresponding to the oil inlet pipe 25. At this time, the oil pump corresponding to the oil inlet pipe 25 pumps hydraulic oil into the annular groove 24, and the adjustment block 42 moves up.

[0070] If the reading transmitted by the pressure sensor 215 continues to increase, the oil pump corresponding to the oil inlet pipe 25 continues to pump hydraulic oil into the annular groove 24. When the reading of the pressure sensor 215 remains unchanged, the pressure inside the annular groove 24 reaches a peak value, that is, hydraulic oil can no longer be pumped into the annular groove 24. At this time, the oil pump corresponding to the oil inlet pipe 25 is turned off.

[0071] After the drilling rod work is finished, the oil pump matched with the oil inlet pipe 1 23 is manually started to pump hydraulic oil into the annular groove 1 22, and then the oil pump matched with the oil inlet pipe 25 is started to discharge the hydraulic oil in the annular groove 24 outward, and the adjustment block 42 is reset at this time.

[0072] The implementation principle of the present invention is:

[0073] (1): Place the annular rubber core 2 just above the existing drill pipe, and then apply external force to the annular frame 1 so that the annular rubber core 2 is sleeved on the drill pipe. At this time, since the diameter of the annular rubber strip 21 is slightly smaller than the diameter of the drill pipe, the friction between the annular rubber strip 21 and the drill pipe can cooperate with the outer wall of the drill pipe through the annular rubber core 2, so that the annular frame 1 is attached to the outer wall of the drill pipe.

[0074] (2): After the annular frame 1 and the annular rubber core 2 are placed, the oil pump matched with the oil inlet pipe 25 is started. At this time, the oil pump starts to pump the hydraulic oil into the annular groove 24. As the hydraulic oil fills the annular groove 24, the hydraulic oil continues to be pumped into the annular groove 24. At this time, due to the increase of hydraulic oil, in order to make room for the excess hydraulic oil pumped into the annular groove 24, the adjusting block 42 moves up along the inner wall of the annular groove 3 and the annular plate 41. The adjusting block 42 moves up and first contacts the side wall of the annular rubber core 2 When the adjusting block 42 contacts the side wall of the annular rubber core 2, the inclined surface on the adjusting block 42 drives the annular rubber core 2 to move upward and drives the annular rubber core 2 to move toward the drill pipe. The annular rubber core 2 holds the drill pipe tightly during the movement toward the drill pipe. At the same time, due to the obstruction of the top of the annular frame 1, the annular rubber core 2 deforms during the collision with the top of the annular frame 1, so that the annular rubber core 2 also moves toward the drill pipe synchronously. Then, due to the obstruction of the annular frame 1, the top of the annular rubber core 2 can also hold the drill pipe tightly.

[0075] (3): As the hydraulic oil gradually increases, the adjusting block 42 continues to move upward. When the cylindrical block 422 contacts the top of the annular groove 3 and continues to move, the cylindrical block 422 drives the adjusting link 421 to move downward due to the obstruction of the top of the annular frame 1. At this time, the return spring 423 contracts, and the adjusting link 421 drives the annular baffle 435 to move downward during the downward movement.

[0076] (4): When the annular baffle 435 is offset from the through groove, the hydraulic oil enters the through groove. At this time, the deformation of the annular rubber core 2 reaches the maximum, so the adjustment block 42 no longer moves due to the obstruction of the annular rubber core 2. At this time, the excess hydraulic oil enters the through groove. The hydraulic oil drives the push block 432 to move. During the movement of the push block 432, the push rod 431 drives the clamping block 433 to move. During the movement of the clamping block 433, the annular structure of the annular rubber core 2 is abutted. At this time, the return spring 423 is compressed, and the clamping block 433 can hold the annular rubber core 2 for a second time.

[0077] (5): When the drilling rod work is finished, the oil pump matched with the oil inlet pipe 23 is started to pump hydraulic oil into the annular groove 22. When the hydraulic oil enters the annular groove 22, it gives a downward force to the adjustment block 42, so that the adjustment block 42 moves down. At this time, the oil pump matched with the oil inlet pipe 25 pumps out the hydraulic oil in the annular groove 24. The hydraulic oil pumped into the annular groove 22 cooperates with the hydraulic oil pumped out of the annular groove 24. At this time, the adjustment block 42 moves down and resets. At this time, all the components of the present invention are reset to the starting position.

[0078] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0079] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A rotary blowout preventer rubber core suitable for composite drilling tools, comprising an annular frame (1), characterized in that: An annular rubber core (2) is installed on the inner wall of the annular frame (1), an annular groove (3) matching with the annular rubber core (2) is provided inside the annular frame (1), and an adjusting mechanism (4) for adjusting the position of the annular rubber core (2) is installed inside the annular groove (3), wherein: The regulating mechanism (4) comprises: Two annular plates (41) are provided and are arranged along the middle of the annular frame (1) toward the side thereof, and are installed at the bottom of the annular groove (3), and the height of the annular plate (41) close to the annular rubber core (2) is lower than the height of the annular plate (41) far from the annular rubber core (2); The adjusting block (42) is arranged inside the annular groove (3) and is an annular structure coaxial with the annular frame (1), moves along the height direction of the annular frame (1) and is slidably matched with the annular plate (41), and a side of the adjusting block close to the annular rubber core (2) is provided with an inclined surface matched with the annular rubber core (2); An adjustment component (43) is arranged on the adjustment block (42) and cooperates with the annular rubber core (2); The top of the adjusting block (42) away from the annular rubber core (2) is provided with an annular groove (22), and the annular groove (22) is in close contact with the side wall of the annular groove (3), and the outer side wall of the annular frame (1) is provided with an oil inlet pipe (23) which is connected with the annular groove (22) and is arranged obliquely; The regulating block (42), the bottom of the annular groove (3) and the two annular plates (41) together form an annular groove (24); an oil inlet pipe (25) penetrating and connected to the annular groove (3) is also installed on the outer wall of the annular frame (1); an end of the oil inlet pipe (25) close to the annular rubber core (2) penetrates the annular plate (41) away from the annular rubber core (2) and is arranged inside the annular groove (24); The adjustment component (43) comprises a plurality of evenly distributed through grooves extending along the circumference of the adjustment block (42), wherein a push rod (431) is arranged inside each of the through grooves, and a push block (432) slidably arranged inside the through groove is installed at one end of the push rod (431) away from the annular rubber core (2), and a pressing block (433) is installed at one end of the push rod (431) close to the annular rubber core (2), and a return spring (434) is sleeved on the push rod (431), and one end of the return spring (434) is installed on the push block (432), and the other end of the return spring (434) is installed on the inner wall of the through groove; The outer wall of the adjustment block (42) is provided with an annular baffle (435) which slides along its height direction, and the annular baffle (435) cooperates with the through groove to separate the through groove and the second annular groove (24) from each other. The adjusting block (42) is provided with two symmetrically distributed adjusting rods (421), and the adjusting rods (421) extend along the height direction of the adjusting block (42) and penetrate and slide on the adjusting block (42), one end of the adjusting rod (421) close to the bottom of the annular groove (3) is installed on the annular baffle (435), and one end of the adjusting rod (421) away from the annular baffle (435) is installed with a cylindrical block (422), and a return spring (423) is sleeved on the adjusting rod (421), one end of the return spring (423) is installed on the top of the adjusting block (42), and the other end of the return spring (423) is installed on the cylindrical block (422).

2. The rotary blowout preventer rubber core suitable for composite drilling tools according to claim 1, characterized in that: The annular rubber core (2) is divided into two sections. An outer wall section of the annular rubber core (2) close to the top of the annular frame (1) is arranged as an inclined structure that matches the adjustment block (42). An end of the annular rubber core (2) close to the bottom of the annular frame (1) is arranged as an annular structure that matches the adjustment component (43). A plurality of annular rubber strips (21) are evenly arranged on the inner wall of the annular rubber core (2) along its height direction.

3. The rotary blowout preventer rubber core suitable for composite drilling tools according to claim 1, characterized in that: The upper half of the annular frame (1) is provided with a plurality of inclined sliding grooves, a resisting rod (11) is arranged inside the sliding groove, an annular circular groove (12) is provided inside the annular frame (1), and the sliding groove and the annular circular groove (12) are connected through.

4. The rotary blowout preventer rubber core suitable for composite drilling tools according to claim 1, characterized in that: A plurality of evenly distributed gas cylinders (13) are arranged at the top of the annular frame (1), a plurality of transition grooves (14) corresponding to the gas cylinders (13) are opened inside the annular frame (1), one end of the transition groove (14) away from the gas cylinder (13) is connected to the annular circular groove (12), and the gas outlet of the gas cylinder (13) is connected to the transition groove (14).

5. The rotary blowout preventer rubber core suitable for composite drilling tools according to claim 1, characterized in that: A plurality of rolling balls (424) matching with the annular rubber core (2) are evenly mounted on the inclined surface of the adjustment block (42) along its circumference.

6. The rotary blowout preventer rubber core suitable for composite drilling tools according to claim 1, characterized in that: A second pressure sensor (15) for monitoring the bottom hole liquid pressure is also installed on the top of the annular frame (1).

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