A rotary blowout prevention device for use with top drive

Abstract

The present invention relates to a rotary blowout preventer, and in particular to a rotary blowout preventer for use with a top drive, which is used to solve the problem that the existing rotary blowout preventer cannot achieve wellhead rotary sealing because the round drill pipe cannot transmit power through a square clamp during top drive operation. The rotary blowout preventer for use with a top drive clamps the round drill pipe through a pneumatic or hydraulic rotary chuck to transmit a rotational torque, and transmits the rotational torque to a rotating body of the rotary blowout preventer, driving the rubber sleeve to rotate synchronously with drilling; there is no relative movement between the rubber sleeve and the round drill pipe, which not only achieves the wellhead rotary sealing during the top drive rotary cycle operation, but also avoids the wear of the inner hole of the rubber sleeve due to the relative movement between the round drill pipe and the rubber sleeve, thereby preventing the loss of sealing function.

Description

Technical Field

[0001] The invention relates to a rotary blowout preventer, in particular to a rotary blowout preventer while drilling for use with a top drive. Background Art

[0002] Rotary BOP is a key device for wellhead pressure control in drilling and well repair operations. Its main function is to ensure the sealing of the wellhead and prevent the fluid from blowing out of the well while allowing the drill pipe to rotate during the drilling process. With the development of drilling technology, the application demand of rotary blowout preventer in various complex working conditions is increasing, especially in pressure drilling and overhaul operations, its importance is more prominent.

[0003] At present, rotary blowout preventers are mainly divided into two types: self-sealing and active. The self-sealing rotary blowout preventer is equipped with a sealing sleeve, the center hole diameter of which is usually smaller than the outer diameter of the drill pipe; when the drill pipe passes through the sealing sleeve, the sealing sleeve will automatically hug the drill pipe to achieve a sealing effect; the design of the self-sealing rotary blowout preventer allows the seal to be maintained without additional external force during the rotation process, which is suitable for traditional drilling operations. The active rotary blowout preventer is different. The center hole diameter of its sealing sleeve is larger than the outer diameter of the drill pipe. When sealing is required, the compressed sealing sleeve is pushed upward by the annular piston at the bottom, causing the sealing sleeve to deform, thereby reducing its inner hole and sealing the drill pipe; active rotary blowout preventers are usually suitable for more complex operating environments and can better cope with harsh conditions such as high pressure and high temperature.

[0004] However, in actual operation, especially in the rotary operation using top drive, the traditional rotary BOP faces challenges. Round drill pipe is often used in top drive operation, while the existing rotary BOP is usually used for square drill pipe operation, relying on a transition square clip to transmit the rotary power to the rotating body in the BOP, so that the sealing rubber sleeve and the drill pipe rotate synchronously. But for round drill pipe, since the transition square clip cannot be used to transmit the rotary power, the existing rotary BOP cannot meet the demand for wellhead rotary sealing.

[0005] To solve this problem, a new follow-up rotary chuck and air and oil guide rotary device are needed to be used in conjunction with the corresponding rotary blowout preventer to ensure that the sealing rubber sleeve and the round drill pipe can rotate synchronously to avoid relative movement, thereby realizing the wellhead sealing function in top drive operations. This design can effectively meet the requirements of pressurized rotary operations and improve operation safety and efficiency. Summary of the invention

[0006] The purpose of the present invention is to solve the problem that the round drill pipe cannot transmit power through the square clamp during top drive operation, resulting in the inability of the existing rotary blowout preventer to achieve wellhead rotary sealing, and to provide a rotary blowout preventer while drilling for top drive.

[0007] In order to solve the deficiencies of the above-mentioned prior art, the present invention provides the following technical solutions:

[0008] A rotary blowout preventer for use with a top drive, including a rotary blowout preventer, which is special in that it also includes a pneumatic or hydraulic rotary drill chuck and an oil and gas guiding rotor; the pneumatic or hydraulic rotary drill chuck includes an upper shell, a lower shell and a hollow drive sleeve coaxially arranged in sequence from top to bottom, and the upper shell, the lower shell and the hollow drive sleeve are respectively provided with connected drill rod through holes in the middle for passing the round drill rod, and a slip mechanism for holding the round drill rod is provided between the upper shell and the lower shell; the upper end of the hollow drive sleeve is connected to the lower shell, and the lower end is provided with a first connecting tooth; the slip mechanism includes a plurality of slip units evenly distributed around the circumference of the drill rod through hole, and each slip unit includes a cylinder or hydraulic cylinder assembly, a slip body and a slip connected in sequence from outside to inside; the cylinder or hydraulic cylinder assembly , the top surfaces of the slip bodies are connected to the bottom surfaces of the upper shells, and the bottom surfaces are connected to the top surfaces of the lower shells; the oil-conducting and air-conducting rotors include an inner hollow bushing and a shell assembly which are sequentially sleeved on the hollow drive sleeve from the inside to the outside, and a first bearing assembly and a first sealing assembly which are arranged between the inner hollow bushing and the shell assembly; the upper end of the inner hollow bushing is connected to the lower shell; the rotary blowout preventer includes a blowout preventer shell and a rotating body assembly which is rotatably connected to the blowout preventer shell; the rotating body assembly includes a rotating body, and the upper end of the rotating body is provided with a second connecting tooth for plugging with the first connecting tooth; the upper end of the blowout preventer shell is connected to the lower end of the shell assembly, and a gap is axially provided between the top surface of the blowout preventer shell and the bottom surface of the shell assembly for disengaging the first connecting tooth from the second connecting tooth;

[0009] The cylinder or liquid cylinder assembly is provided with a first channel and a second channel, the first channel is connected with the rodless chamber of the cylinder or liquid cylinder assembly, and the second channel is connected with the rod chamber of the cylinder or liquid cylinder assembly; the lower shell is provided with a third channel and a fourth channel; the inner hollow bushing is provided with a fifth channel and a sixth channel; the shell assembly is provided with a first air inlet and a second air inlet and a liquid inlet; the first air inlet and a liquid inlet, the fifth channel, the third channel and the first channel are connected in sequence, and are used for air intake or liquid intake to drive the cylinder or liquid cylinder assembly to drive the cava body and the cava to move inward and hold the round drill rod; the second air inlet and a liquid inlet, the sixth channel, the fourth channel and the second channel are connected in sequence, and are used for air intake or liquid intake to drive the cylinder or liquid cylinder assembly to drive the cava body and the cava to move outward and release the round drill rod.

[0010] Furthermore, the rotating body assembly also includes a rubber sleeve, the rotating body and the rubber sleeve are sequentially connected from top to bottom, and a second sealing assembly and a second bearing assembly are arranged between the rotating body and the blowout preventer housing.

[0011] Furthermore, the slip body comprises an upper connecting plate, a main body and a lower connecting plate which are coaxially connected in sequence from top to bottom; a piston rod clamping groove is arranged on the outer side surface of the main body, and the slip is arranged on the inner side surface, and all the slips are closed to hold the round drill rod tightly;

[0012] The gas cylinder or liquid cylinder assembly comprises a cylinder body, a cylinder cover and a piston; the cylinder cover is arranged at the outer end opening of the cylinder body, a piston cavity is formed between the cylinder cover and the cylinder body, the piston is arranged in the piston cavity, a piston rod is arranged on the inner side of the piston, and one end of the piston rod is located in the piston rod clamping groove; the top surface and the bottom surface of the cylinder body are both provided with convex ridges near the piston rod, which are respectively clamped with the first clamping groove arranged on the bottom surface of the upper shell body and the second clamping groove arranged on the top surface of the lower shell body, so as to radially limit the gas cylinder or liquid cylinder assembly;

[0013] The first passage is arranged on the cylinder block and the cylinder head, and the second passage is arranged on the cylinder block.

[0014] Furthermore, the bottom surface of the upper shell is also provided with a plurality of first slide grooves, and the top surface of the lower shell is also provided with a plurality of second slide grooves; the plurality of upper connecting plates are respectively provided with the plurality of first slide grooves, and the plurality of lower connecting plates are respectively provided with the plurality of second slide grooves.

[0015] Further, the housing assembly comprises a pressure ring and a housing, the housing is sleeved on the inner hollow bushing, the pressure ring is arranged on the top of the housing and is located at the outer periphery of the inner hollow bushing;

[0016] The first bearing assembly includes an upper bearing and a lower bearing which are sequentially arranged between the inner hollow bushing and the housing from top to bottom. An annular cavity is formed between the upper bearing, the lower bearing, the inner hollow bushing and the housing, and the first sealing assembly is arranged in the annular cavity.

[0017] Furthermore, the first sealing assembly includes a third spacer ring, an upper second spacer ring, a first spacer ring and a lower second spacer ring, which are sequentially arranged in the annular cavity from top to bottom, and three first sealing members, which are sequentially arranged between the third spacer ring and the upper second spacer ring, between the upper second spacer ring and the first spacer ring, and between the first spacer ring and the lower second spacer ring from top to bottom; each second spacer ring is provided with a plurality of second radial gas-liquid holes, and the first air and liquid inlet and the fifth channel, and the second air and liquid inlet and the sixth channel are connected via at least one second radial gas-liquid hole.

[0018] Furthermore, the blowout preventer housing comprises a blowout preventer upper housing and a blowout preventer lower housing connected in sequence from top to bottom; a plurality of circumferentially evenly distributed internal threaded holes are provided on the top surface of the blowout preventer upper housing, and a connecting limit plate corresponding to the plurality of internal threaded holes is provided at the lower end of the housing assembly, and each internal threaded hole is connected to the corresponding connecting limit plate through a fixing rod; the gap is axially arranged between the top surface of the blowout preventer upper housing and all the connecting limit plates.

[0019] Further, the second sealing assembly includes a second sealing member disposed between the rotating body and the upper housing of the blowout preventer, and the second sealing member is pressed by a pressing cap located above the second sealing member;

[0020] The second bearing assembly includes a first bearing arranged between the upper end of the rubber sleeve and the upper shell of the blowout preventer, and a second bearing arranged between the middle part of the rubber sleeve and the lower shell of the blowout preventer.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention provides a rotary blowout preventer for use with a top drive. The rotary blowout preventer clamps a round drill pipe through a pneumatic or hydraulic rotary chuck while drilling to transmit a rotational torque, which is then transmitted to a rotating body of the rotary blowout preventer, thereby driving a rubber sleeve to rotate synchronously with drilling. There is no relative movement between the rubber sleeve and the round drill pipe, which not only realizes the rotary sealing of the wellhead during the rotary cycle operation of the top drive, but also avoids the wear of the inner hole of the rubber sleeve due to the relative movement between the round drill pipe and the rubber sleeve, thereby preventing the loss of the sealing function.

[0023] (2) In the present invention, all gas and liquid circuits in the pneumatic or hydraulic rotary drilling chuck and the oil and gas guiding rotor are built-in gas and liquid circuits, and there are no pipelines connecting the components, and there is no phenomenon of pipelines and moving parts being entangled with each other.

[0024] (3) In the present invention, a first connecting tooth is arranged at the lower end of the hollow driving sleeve, and a second connecting tooth plugged into the first connecting tooth is arranged at the upper end of the rotating body of the rotary blowout preventer. The two are convenient to plug in and transmit a large torque. At the same time, they have a certain radial and circumferential range of motion, which meets the operating requirements of the eccentric working condition of the round drill pipe and avoids the phenomenon of holding force between the pneumatic or hydraulic rotary drilling chuck and the oil and gas guiding rotor due to the eccentricity of the round drill pipe.

[0025] (4) In the present invention, a plurality of connection limit plates are arranged at the lower end of the lower shell of the pneumatic or hydraulic rotary drilling chuck, and a plurality of circumferentially evenly distributed internal threaded holes are arranged on the top surface of the upper shell of the blowout preventer. Each internal threaded hole is connected to the corresponding connection limit plate through a fixing rod, thereby preventing the upper shell and lower shell of the pneumatic or hydraulic rotary drilling chuck, the shell assembly of the oil-conducting and air-conducting rotor, and the blowout preventer shell from rotating under the friction of the internal rotating body; a limit pressure plate is fixed on the top of the plurality of fixing rods to prevent the pneumatic or hydraulic rotary drilling chuck and the oil-conducting and air-conducting rotor from being taken away from the rotary blowout preventer when the round drill pipe is lifted. At the same time, a gap is arranged axially between the top surface of the blowout preventer shell and the bottom surface of the shell assembly, for disengaging the first connection tooth from the second connection tooth. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of an embodiment of a rotary blowout preventer while drilling for use with a top drive according to the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of a pneumatic or hydraulic rotary-while-drilling chuck in an embodiment of the present invention;

[0028] Figure 3 for Figure 2 AA section view;

[0029] Figure 4 It is a front cross-sectional view of the upper housing in an embodiment of the present invention;

[0030] Figure 5 A bottom view of the upper housing in an embodiment of the present invention;

[0031] Figure 6 is a front cross-sectional view of the lower housing in an embodiment of the present invention;

[0032] Figure 7 A top view of the lower housing in an embodiment of the present invention;

[0033] Figure 8 It is a front cross-sectional view of the slip seat in the embodiment of the present invention;

[0034] Fig. 9 for Figure 8 BB section view;

[0035] Fig.10 It is a front cross-sectional view of the oil-conducting and air-conducting rotor in an embodiment of the present invention;

[0036] Fig.11 for Fig.10 CC section view;

[0037] Fig.12 for Fig.11 DD section view.

[0038] The following are the descriptions of the reference numerals:

[0039] 1- pneumatic or hydraulic drilling rotary chuck, 11- upper shell, 111- first slot, 112- first slide, 12- lower shell, 121- second slot, 122- second slide, 123- third channel, 124- fourth channel, 13- hollow drive sleeve, 131- first connecting tooth, 14- cylinder or hydraulic cylinder assembly, 141- cylinder body, 142- cylinder head, 143- piston, 144- first channel, 145- second channel, 146- ridge, 15- slip body, 151- upper connecting plate, 152- body, 153- lower connecting plate, 154- piston rod slot, 16- slip;

[0040] 2-oil-guiding and air-guiding rotor, 21-inner hollow bushing, 211-fifth channel, 212-sixth channel, 213-first radial channel, 214-first axial channel, 215-second radial channel, 216-second axial channel, 22-pressure ring, 23-housing, 231-first air and liquid inlet, 232-second air and liquid inlet, 24-upper bearing, 25-lower bearing, 26-first spacer ring, 27-second spacer ring, 271-second radial air and liquid hole, 28-third spacer ring, 29-connecting limit plate, 201-first sealing member;

[0041] 3-rotating blowout preventer, 31-blowout preventer housing, 311-blowout preventer upper housing, 312-blowout preventer lower housing, 32-rotating body assembly, 321-rotating body, 322-rubber sleeve, 3221-second connecting tooth, 33-second sealing member, 34-pressure cap, 35-first bearing, 36-second bearing;

[0042] 4-Fixed rod;

[0043] 5-Limiting pressure plate. DETAILED DESCRIPTION

[0044] The present invention will be further described below in conjunction with the accompanying drawings and exemplary embodiments.

[0045] Reference Figures 1 to 12 A rotary blowout preventer for use with a top drive comprises a pneumatic or hydraulic rotary blowout preventer 1, an oil-conducting and air-conducting rotor 2 and a rotary blowout preventer 3.

[0046] Reference Figures 1 to 9 The pneumatic or hydraulic rotary drilling chuck 1 comprises an upper shell 11, a lower shell 12, and a hollow driving sleeve 13 which are coaxially arranged from top to bottom. The upper shell 11, the lower shell 12, and the hollow driving sleeve 13 are provided with connected drill rod through holes for passing the round drill rod. A slip mechanism for holding the round drill rod is provided between the upper shell 11 and the lower shell 12. The upper end of the hollow driving sleeve 13 is connected to the lower shell 12, and the lower end is provided with a first connecting tooth 131.

[0047] Reference Figures 1 to 3 , Figure 8 , Fig. 9 The slip mechanism includes four slip units evenly distributed around the circumference of the drill pipe through hole, and each slip unit includes a cylinder or liquid cylinder assembly 14, a slip body 15 and a slip 16 connected in sequence from the outside to the inside.

[0048] The slip body 15 includes an upper connecting plate 151, a body 152 and a lower connecting plate 153 which are coaxially connected in sequence from top to bottom. Figure 8 The outer side surfaces of the upper connecting plate 151 and the lower connecting plate 153 are both quarter arc surfaces; the outer side surface of the body 152 is a plane, and the inner side surface is also a quarter arc surface. The outer side surface of the body 152 is provided with a piston rod slot 154 ( Figure 8 , Fig. 9 ), the inner side is connected with slips 16 by bolts, and all the slips 16 can hold the round drill pipe tightly when they are closed. The holding is a radial limit and does not affect the axial movement of the round drill pipe when it is held tightly.

[0049] The cylinder or hydraulic cylinder assembly 14 includes a cylinder body 141, a cylinder head 142 and a piston 143 ( Figure 1 , Figure 2 ); The cylinder cover 142 is arranged at the outer end opening of the cylinder body 141, and a piston cavity is formed between the cylinder cover 142 and the cylinder body 141. A piston 143 is arranged in the piston cavity, and the piston 143 divides the piston cavity into a rodless cavity and a rod cavity; a piston rod is arranged on the inner side of the piston 143, and one end of the piston rod is located in the piston rod groove 154.

[0050] The top and bottom surfaces of the cylinder body 141 are provided with ridges 146 near the piston rod. Figure 1 , Figure 2 ), respectively engaged with the first card slot 111 provided on the bottom surface of the upper shell 11 and the second card slot 121 provided on the top surface of the lower shell 12 ( Figures 4 to 7 ), used to limit the radial direction (referring to the radial direction of the pneumatic or hydraulic rotary drilling chuck 1) of the cylinder or hydraulic cylinder assembly 14. The bottom surface of the upper shell 11 is also provided with four first slide grooves 112, and the top surface of the lower shell 12 is also provided with four second slide grooves 122 ( Figures 4 to 7 ); The four upper connecting plates 151 are respectively located in the four first slide grooves 112, and the four lower connecting plates 153 are respectively located in the four second slide grooves 122. Thus, by controlling the oil in and out of the cylinder or hydraulic cylinder assembly 14, the piston 143 can indirectly drive the slip 16 to move radially to clamp or loosen the round drill rod.

[0051] Reference Figures 10 to 12The oil-guiding and air-guiding rotor 2 includes an inner hollow bushing 21 and a housing assembly which are sequentially sleeved on the hollow driving sleeve 13 from the inside to the outside, and a first bearing assembly and a first sealing assembly which are arranged between the inner hollow bushing 21 and the housing assembly; the housing assembly includes a pressure ring 22 and a housing 23, the inner hollow bushing 21 and the housing 23 are sequentially sleeved on the hollow driving sleeve 13 from the inside to the outside, the upper end of the inner hollow bushing 21 extends out of the housing 23 and is connected to the lower housing 12; the pressure ring 22 is arranged on the top of the housing 23 and is located on the outer periphery of the inner hollow bushing 21; the first bearing assembly includes a pressure ring 22 and a housing 23 which are sequentially sleeved on the inner hollow driving sleeve 13 from the inside to the outside, the upper end of the inner hollow bushing 21 extends out of the housing 23 and is connected to the lower housing 12; the pressure ring 22 is arranged on the top of the housing 23 and is located on the outer periphery of the inner hollow bushing 21; the first bearing assembly includes a pressure ring 22 and a housing 23 which are sequentially arranged on the inner hollow bushing 21 from top to bottom. An upper bearing 24 and a lower bearing 25 are provided between the hollow bushing 21 and the housing 23, and an annular cavity is formed between the upper bearing 24, the lower bearing 25, the inner hollow bushing 21 and the housing 23. The first sealing assembly includes a third spacer ring 28, an upper second spacer ring 27, a first spacer ring 26 and a lower second spacer ring 27 which are sequentially arranged in the annular cavity from top to bottom, and three first sealing members 201 which are sequentially arranged between the third spacer ring 28 and the upper second spacer ring 27, between the upper second spacer ring 27 and the first spacer ring 26, and between the first spacer ring 26 and the lower second spacer ring 27 from top to bottom.

[0052] Reference Figure 1 The rotary BOP 3 comprises a BOP housing 31 and a rotating body assembly 32 rotatably connected in the BOP housing 31 .

[0053] The rotating body assembly 32 comprises a rotating body 321 and a rubber sleeve 322 which are connected in sequence from top to bottom (the upper part of the rubber sleeve 322 is made of metal, and the rest is made of non-metal, so different section lines are used); the upper end of the rotating body 321 is provided with a second connecting tooth 3221 for plugging with the first connecting tooth 131, and a second sealing assembly and a second bearing assembly are provided between the rotating body 321 and the upper shell 311 of the blowout preventer; the second sealing assembly comprises a second sealing member 33 provided between the rotating body 321 and the upper shell 311 of the blowout preventer; a pressing cap 34 for pressing the second sealing member 33 is provided above the second sealing member 33; the second bearing assembly comprises a first bearing 35 provided between the upper end of the rubber sleeve 322 and the upper shell 311 of the blowout preventer, and a second bearing 36 provided between the middle part of the rubber sleeve 322 and the lower shell 312 of the blowout preventer, and the first bearing 35 and the second bearing 36 can both bear the axial load of the rotating body assembly 32 and ensure its rotation. Thus, the rotating body assembly 32 can be rotated relative to the housing 23 under the drive of the pneumatic or hydraulic rotary-while-drilling chuck 1 (when the first connecting teeth 131 and the second connecting teeth 3221 are plugged in).

[0054] The BOP housing 31 includes an upper BOP housing 311 and a lower BOP housing 312 connected in sequence from top to bottom; the top surface of the upper BOP housing 311 is provided with six circumferentially evenly distributed internal threaded holes, the lower end of the housing 23 is provided with a connection limit plate 29 corresponding to the six internal threaded holes, the lower end of the fixing rod 4 is connected to the corresponding internal threaded holes of the upper BOP housing 311, and the upper end of the fixing rod 4 is connected to the connection limit plate 5 by bolts after passing through the corresponding connection limit plate 29. A gap is provided axially between the top surface of the upper BOP housing 311 and all the connection limit plates 29, which is used to disengage the first connection teeth 131 from the second connection teeth 3221.

[0055] Reference Figure 1 , Figure 6 , Figure 8 A second channel 145 is provided on the cylinder body 141, and a first channel 144 is provided on the cylinder body 141 and the cylinder head 142; the first channel 144 is communicated with the rodless cavity of the cylinder or liquid cylinder assembly 14, and the second channel 145 is communicated with the rod cavity of the cylinder or liquid cylinder assembly 14; a third channel 123 and a fourth channel 124 are provided on the lower shell 12; a fifth channel 211 and a sixth channel 212 are provided on the inner hollow bushing 21, the fifth channel 211 includes a first radial channel 213 and a first axial channel 214, and the sixth channel 212 includes a second radial channel 215 and a second axial channel 216; six second radial gas-liquid holes 271 are provided on each second partition ring 27; a first air inlet and liquid inlet 231 and a second air inlet and liquid inlet 232 are provided on the shell 23.

[0056] The first air and liquid inlet 231, the second radial air and liquid hole 271, the first radial channel 213, the first axial channel 214, the third channel 123 and the first channel 144 are connected in sequence, and are used for air or liquid intake to drive the piston rod to extend, drive the slip body 15 and the slip 16 to move inward and hold the round drill rod; the second air and liquid inlet 232, the second radial air and liquid hole 271, the second radial channel 215, the second axial channel 216, the fourth channel 124 and the second channel 145 are connected in sequence, and are used for air or liquid intake to drive the piston rod to retract, drive the slip body 15 and the slip 16 to move outward and release the round drill rod.

[0057] The working principle of the present invention is as follows:

[0058] Step 1: Before use, install the pneumatic or hydraulic rotary drilling chuck 1, the oil and gas guiding rotor 2 and the rotary blowout preventer 3 respectively, and connect the rotary blowout preventer 3 to the wellhead;

[0059] Step 2: When in use, supply gas or liquid to the first gas and liquid inlet 231, and the gas or liquid enters the rodless cavity of the cylinder or liquid cylinder assembly 14 through the second radial gas-liquid hole 271, the first radial channel 213, the first axial channel 214, the third channel 123 and the first channel 144 in turn, and drives the piston rod to extend, pushing the slip body 15 and the slip 16 thereon to move inward and hold the round drill pipe tightly; during the rotary cycle operation, the top drive drives the round drill pipe to rotate, and the round drill pipe drives the pneumatic or hydraulic rotary drilling chuck 1 and the rotary body assembly 32 in the rotary blowout preventer 3 to rotate in turn; since the rotary body assembly 32 is rotationally connected to the blowout preventer housing 31 of the rotary blowout preventer 3, and dynamic sealing is achieved through the second sealing member 33, wellhead rotary sealing can be achieved to meet the rotary sealing operation requirements;

[0060] Step 3: After the rotation cycle operation is completed, gas or liquid is supplied to the second air and liquid inlet 232, and the gas or liquid passes through the second radial gas-liquid hole 271, the second radial channel 215, the second axial channel 216, the fourth channel 124 and the second channel 145 below in sequence, driving the piston rod to retract, driving the slip body 15 and the slip 16 thereon to move outward and loosen the round drill rod.

[0061] Since the slip teeth are specially designed (the clamping is radially limited and does not affect the axial movement of the round drill pipe in the clamping state), when the slip teeth clamp the round drill pipe and drive the pneumatic or hydraulic rotary drilling chuck 1 to rotate with drilling, it does not affect the up and down movement of the round drill pipe in the clamping state.

Claims

1. A rotary blowout preventer for use with a top drive, comprising a rotary blowout preventer (3), characterized in that: The invention also comprises a pneumatic or hydraulic rotary drilling chuck (1) and an oil-conducting and air-conducting rotor (2); the pneumatic or hydraulic rotary drilling chuck (1) comprises an upper shell (11), a lower shell (12) and a hollow driving sleeve (13) which are coaxially arranged in sequence from top to bottom; the middle of the upper shell (11), the lower shell (12) and the hollow driving sleeve (13) are respectively provided with a connected drill rod through hole for passing a round drill rod; a hole for holding a round drill rod is provided between the upper shell (11) and the lower shell (12). The slip mechanism of the drill rod; the upper end of the hollow driving sleeve (13) is connected to the lower shell (12), and the lower end is provided with a first connecting tooth (131); the slip mechanism comprises a plurality of slip units evenly distributed around the circumference of the drill rod through hole, and each slip unit comprises a cylinder or liquid cylinder assembly (14), a slip body (15) and a slip (16) connected in sequence from the outside to the inside; the top surfaces of the cylinder or liquid cylinder assembly (14) and the slip body (15) are connected to the bottom surface of the upper shell (11), and the bottom surfaces are The oil-conducting and air-conducting rotor (2) comprises an inner hollow bushing (21) which is sequentially sleeved on the hollow driving sleeve (13) from the inside to the outside, a shell assembly, and a first bearing assembly and a first sealing assembly which are arranged between the inner hollow bushing (21) and the shell assembly; the upper end of the inner hollow bushing (21) is connected to the lower shell (12); the rotary blowout preventer (3) comprises a blowout preventer shell (31) and a rotating body assembly (32) which is rotatably connected to the blowout preventer shell (31); the rotating body assembly (32) comprises a rotating body (321), and the upper end of the rotating body (321) is provided with a second connecting tooth (3221) for plugging with the first connecting tooth (131); the upper end of the blowout preventer shell (31) is connected to the lower end of the shell assembly, and a gap is axially provided between the top surface of the blowout preventer shell (31) and the bottom surface of the shell assembly, so as to enable the first connecting tooth (131) to be disengaged from the second connecting tooth (3221); The cylinder or liquid cylinder assembly (14) is provided with a first channel (144) and a second channel (145), the first channel (144) is communicated with the rodless cavity of the cylinder or liquid cylinder assembly (14), and the second channel (145) is communicated with the rod cavity of the cylinder or liquid cylinder assembly (14); the lower shell (12) is provided with a third channel (123) and a fourth channel (124); the inner hollow bushing (21) is provided with a fifth channel (211) and a sixth channel (212); the shell assembly is provided with a first air inlet and a second air inlet and a second liquid inlet (231); 2); the first air inlet and liquid inlet (231), the fifth channel (211), the third channel (123) and the first channel (144) are connected in sequence, and are used for air or liquid inlet to drive the air cylinder or liquid cylinder assembly (14) to drive the slip body (15) and the slip (16) to move inward and hold the round drill rod; the second air inlet and liquid inlet (232), the sixth channel (212), the fourth channel (124) and the second channel (145) are connected in sequence, and are used for air or liquid inlet to drive the air cylinder or liquid cylinder assembly (14) to drive the slip body (15) and the slip (16) to move outward and release the round drill rod.

2. A rotary blowout preventer for use with a top drive according to claim 1, characterized in that: The rotating body assembly (32) further comprises a rubber sleeve (322), the rotating body (321) and the rubber sleeve (322) are connected in sequence from top to bottom, and a second sealing assembly and a second bearing assembly are arranged between the rotating body (321) and the blowout preventer housing (31).

3. A rotary blowout preventer for use with a top drive according to claim 2, characterized in that: The slip body (15) comprises an upper connecting plate (151), a body (152) and a lower connecting plate (153) which are coaxially connected in sequence from top to bottom; a piston rod clamping groove (154) is arranged on the outer side surface of the body (152), and the slip (16) is arranged on the inner side surface, and all the slips (16) are closed to hold the round drill rod tightly; The gas cylinder or liquid cylinder assembly (14) comprises a cylinder body (141), a cylinder cover (142) and a piston (143); the cylinder cover (142) is arranged at the outer end opening of the cylinder body (141), a piston cavity is formed between the cylinder cover (142) and the cylinder body (141), the piston (143) is arranged in the piston cavity, a piston rod is arranged on the inner side surface of the piston (143), and one end of the piston rod is located in the piston rod clamping groove (154); the top surface and the bottom surface of the cylinder body (141) are both provided with convex ridges (146) near the piston rod, which are respectively clamped with a first clamping groove (111) provided on the bottom surface of the upper shell (11) and a second clamping groove (121) provided on the top surface of the lower shell (12), so as to radially limit the gas cylinder or liquid cylinder assembly (14); The first passage (144) is provided on the cylinder body (141) and the cylinder head (142), and the second passage (145) is provided on the cylinder body (141).

4. A rotary blowout preventer for use with a top drive according to claim 3, characterized in that: The bottom surface of the upper shell (11) is also provided with a plurality of first slide grooves (112), and the top surface of the lower shell (12) is also provided with a plurality of second slide grooves (122); the plurality of upper connecting plates (151) are respectively provided in cooperation with the plurality of first slide grooves (112), and the plurality of lower connecting plates (153) are respectively provided in cooperation with the plurality of second slide grooves (122).

5. A rotary blowout preventer for use with a top drive according to any one of claims 2 to 4, characterized in that: The housing assembly comprises a pressure ring (22) and a housing (23), wherein the housing (23) is sleeved on the inner hollow bushing (21), and the pressure ring (22) is arranged on the top of the housing (23) and is located on the outer periphery of the inner hollow bushing (21); The first bearing assembly comprises an upper bearing (24) and a lower bearing (25) which are arranged in sequence from top to bottom between an inner hollow bushing (21) and a housing (23); an annular cavity is formed between the upper bearing (24), the lower bearing (25), the inner hollow bushing (21) and the housing (23); and the first sealing assembly is arranged in the annular cavity.

6. A rotary blowout preventer for use with a top drive according to claim 5, characterized in that: The first sealing assembly comprises a third spacer ring (28), an upper second spacer ring (27), a first spacer ring (26) and a lower second spacer ring (27) which are sequentially arranged in the annular cavity from top to bottom, and three first sealing members (201) which are sequentially arranged from top to bottom between the third spacer ring (28) and the upper second spacer ring (27), between the upper second spacer ring (27) and the first spacer ring (26), and between the first spacer ring (26) and the lower second spacer ring (27); Each second spacer ring (27) is provided with a plurality of second radial gas-liquid holes (271). The first air and liquid inlet (231) and the fifth channel (211), as well as the second air and liquid inlet (232) and the sixth channel (212) are all in communication via at least one second radial air-liquid hole (271).

7. A rotary blowout preventer for use with a top drive according to claim 6, characterized in that: The blowout preventer housing (31) comprises a blowout preventer upper housing (311) and a blowout preventer lower housing (312) which are connected in sequence from top to bottom; a plurality of circumferentially evenly distributed internal threaded holes are arranged on the top surface of the blowout preventer upper housing (311); a connection limit plate (29) corresponding to the plurality of internal threaded holes is arranged at the lower end of the housing assembly; each internal threaded hole is connected to a corresponding connection limit plate (29) through a fixing rod (4); and the gap is axially arranged between the top surface of the blowout preventer upper housing (311) and all the connection limit plates (29).

8. The rotary blowout preventer for use with a top drive according to claim 7, characterized in that: The second sealing assembly comprises a second sealing member (33) disposed between the rotating body (321) and the upper shell (311) of the blowout preventer, and the second sealing member (33) is pressed by a pressing cap (34) located above the second sealing member (33); The second bearing assembly comprises a first bearing (35) arranged between the upper end of the rubber sleeve (322) and the upper shell (311) of the blowout preventer, and a second bearing (36) arranged between the middle part of the rubber sleeve (322) and the lower shell (312) of the blowout preventer.

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