A wellhead non-disassembly type rotary blowout preventer

Abstract

The present invention discloses a wellhead non-disassembly type rotary blowout preventer, and relates to the technical field of petroleum machinery and equipment. The present invention comprises: a housing; a center hole is provided at the top of the housing; a rotating assembly, the rotating assembly comprises an outer cylinder and a rotating head, the outer wall of the outer cylinder is provided with an oil inlet ring groove and an oil return ring groove spaced apart along its axial direction, the upper part of the inner wall is provided with an oil return port connected to the sealing cavity, and the lower part is provided with an oil inlet connected to the sealing cavity; an oil distribution assembly, the upper part of the oil distribution assembly is sleeved on the outer wall of the outer cylinder, the lower part is fixedly connected to the housing, the upper part of the oil distribution assembly is provided with an oil inlet hole connected to the oil inlet ring groove and an oil return hole connected to the oil return ring groove, the oil inlet hole is connected to the oil inlet pipe, and the oil return hole is connected to the oil return pipe. The present invention sets the oil distribution assembly, so that after the rotating assembly is installed in place, the rotating assembly can be automatically connected to the hydraulic circuit, without the need for manual repeated disassembly and assembly of the hydraulic pipeline, avoiding manual high-altitude operations, and improving production efficiency and work safety.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum mechanical equipment, and more particularly to a wellhead non-disassembly type rotary blowout preventer. Background Art

[0002] The rotary blowout preventer is used to seal the drill bit during the drilling process. It is an essential key equipment in pressure-controlled drilling and underbalanced drilling. Rotary blowout preventers are mainly divided into two categories: active and passive. The active type is used much less than the passive type due to factors such as complex control and inconvenience in replacing the rubber core on site. The service life of the rubber core of the passive rotary blowout preventer is short, and it is often necessary to replace the rubber core on site. Passive rotary blowout preventers usually include a shell, a rotating assembly, and a clamp for connecting the shell and the rotating assembly. For example, the invention patent with publication number CN1254052A discloses a drilling rotary blowout preventer, which is a passive rotary blowout preventer, which includes a rotating assembly and a shell. A center tube is provided in the rotating assembly. An upper connecting flange is provided on the upper part of the center tube and is fixed to the center tube by bolts and locating pins. An upper rubber core is provided on the upper part of the center tube. An oil pressure capsule is provided in the annulus between the upper rubber core and the center tube. A lower rubber core leakage observation hole is provided, a sliding bearing straightening sleeve is provided on the outside of the central tube, a lubricating oil channel is provided in the sliding bearing straightening sleeve, and a lubricating oil injection hole and a discharge hole are provided on the outside of the sleeve. An axial thrust ball bearing and a radial tapered rolling bearing are provided on the outside of the middle of the central tube, a V-shaped packing, an anti-wear straightening sleeve, a cooling fin, and a cooling water injection port and a discharge port are provided on the lower part of the central tube, and a lower rubber core is also provided on the lower part of the central tube, which is fixed to the central tube by bolts; a clamp is provided on the outside of the shell, and the rotating assembly and the shell are fixedly connected by bolts. When the lower rubber core needs to be replaced, the rotating assembly together with the lower rubber core can be lifted out and the lower rubber can be replaced by loosening the fixing bolts on the clamp. However, there are the following prominent problems in the process of replacing the rubber core: in the process of replacing the rubber core, the fixing bolts of the clamp need to be loosened, the rotating assembly needs to be lifted out, and before the rotating assembly is lifted out, the control oil circuit needs to be cut off and the lubricating oil delivery pipeline on it needs to be removed to prevent the pipeline from breaking and causing lubricating oil leakage. However, since the rotary blowout preventer is located at the highest point of the wellhead, the disassembly and assembly operation is very inconvenient, the disassembly and assembly efficiency is low and the safety is poor, which can easily cause the drilling to stop for too long, thereby causing other drilling accidents.

[0003] Therefore, how to provide a rotary blowout preventer that is simple to operate and easy to assemble and disassemble is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] In view of this, the present invention aims to provide a wellhead non-disassembly rotary blowout preventer to at least to some extent solve the problems of cumbersome manual disassembly, low efficiency and poor safety when replacing the rubber core of the rotary blowout preventer in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A wellhead non-disassembly type rotary blowout preventer, comprising:

[0007] A shell; a center hole is formed on the top of the shell;

[0008] A rotating assembly, the rotating assembly comprising an outer cylinder and a rotating head, the outer cylinder being installed in the center hole, an upper dynamic sealing ring being installed on the inner wall of the upper end of the outer cylinder, and a lower dynamic sealing ring being installed on the inner wall of the lower end, the upper part of the rotating head being rotatably installed in the outer cylinder, and a sealing cavity is formed between its outer wall and the upper dynamic sealing ring and the lower dynamic sealing ring, and a bearing is installed at the outer wall of the rotating head corresponding to the sealing cavity; an oil inlet ring groove and an oil return ring groove are provided at intervals along the axial direction of the outer wall of the outer cylinder, an oil return port connected to the sealing cavity is provided on the upper part of the inner wall, an oil inlet port connected to the sealing cavity is provided on the lower part, and an oil inlet channel connected to the oil inlet ring groove and the oil inlet and an oil return channel connected to the oil return ring groove and the oil return port are provided inside the side wall;

[0009] An oil distribution assembly, the upper part of which is sleeved on the outer side wall of the outer cylinder, and the lower part is connected to the shell. The upper part of the oil distribution assembly is provided with an oil inlet hole connected to the oil inlet ring groove and an oil return hole connected to the oil return ring groove. The oil inlet hole is connected to the oil inlet pipe, and the oil return hole is connected to the oil return pipe.

[0010] The beneficial effects that can be achieved by the present invention are as follows: by setting an oil distribution assembly, the oil inlet pipe and the oil return pipe are connected to the oil distribution assembly, so that after the rotating assembly is installed, its oil inlet ring groove and the oil return ring groove can be automatically connected to the oil inlet pipe and the oil return pipe respectively through the oil distribution assembly, and the oil inlet pipe and the oil return pipe joint do not need to be disassembled and assembled, avoiding manual high-altitude operations, saving manpower, shortening the drilling stop time, improving production efficiency, and avoiding safety accidents.

[0011] Furthermore, the oil distribution assembly includes an oil distribution ring and a plurality of oil distribution ring fixings, the oil distribution ring being sleeved on the outer side wall of the outer cylinder, and the oil distribution ring being provided with an oil inlet hole connected to the oil inlet ring groove and an oil return hole connected to the oil return ring groove; the plurality of oil distribution ring fixings are arranged at intervals along the circumferential direction of the oil distribution ring, and the top of each of the oil distribution ring fixings is connected to the bottom of the oil distribution ring, a limiting protrusion is formed on the bottom, and a limiting groove connected to the limiting protrusion is provided on the outer side wall of the shell corresponding to each of the limiting protrusions.

[0012] Furthermore, the limiting protrusion is fixed in the limiting groove by means of screws.

[0013] Furthermore, a clamp assembly is provided, the clamp assembly comprising an oil cylinder and a first hoop piece and a second hoop piece connected in a buckle-type manner, one end of the first hoop piece is hingedly connected to the fixed end of the oil cylinder, one end of the second hoop piece is hingedly connected to the other end of the first hoop piece, and the other end is hingedly connected to the movable end of the oil cylinder;

[0014] The first hoop plate has the same structure as the second hoop plate, and a through slot is formed on the inner side wall thereof corresponding to the oil distribution ring fixing piece, and a lower annular clamping convex is formed on the lower part of the inner side wall, and an upper annular clamping groove is formed on the upper part, and a lower annular clamping groove which is engaged with the lower annular clamping convex is formed on the outer side wall of the shell body corresponding to the upper limit groove, and an upper annular clamping convex which is engaged with the upper annular clamping groove is formed on the outer side wall of the outer cylinder.

[0015] Furthermore, the oil cylinder comprises:

[0016] The cylinder barrel is a cylindrical structure with closed ends, one end of which is provided with a first oil port, and the other end of which is provided with a second oil port; the first hoop is hinged on the outer wall of the cylinder barrel at one end close to the second oil port;

[0017] A piston assembly, one end of which is slidably installed in the inner cavity of the cylinder along the axial direction of the cylinder, and the other end of which passes through the end of the other end of the cylinder and is hinged to the second hoop.

[0018] Furthermore, the piston assembly comprises:

[0019] A piston rod, one end of which is slidably mounted in the inner cavity of the cylinder barrel along the axial direction of the cylinder barrel, and the other end of which passes through the end wall of the cylinder barrel near one end of the first oil port and is hinged to the second hoop;

[0020] An outer sleeve, the outer sleeve is a cylindrical structure with closed ends, fixed to the end of the piston rod corresponding to the cylinder, and its outer wall is slidably connected to the inner wall of the cylinder; a plurality of first oil holes are provided at one end of the outer sleeve close to the first oil port, and a plurality of second oil holes are provided at one end close to the second oil port; a plurality of sliding openings communicating with its inner cavity are circumferentially spaced on the side wall of the outer sleeve;

[0021] A wedge pushing assembly, wherein the wedge pushing assembly is slidably installed in the inner cavity of the outer sleeve along the axial direction of the cylinder;

[0022] A plurality of wedge blocks, an inner wall of the cylinder barrel close to the second oil port is provided with a cylinder barrel inclined sliding surface whose inner diameter gradually decreases toward the direction away from the second oil port, the plurality of wedge blocks correspond to the plurality of sliding ports one by one and are slidably installed in the sliding ports along the radial direction of the outer sleeve, and each of the wedge blocks is provided with a first inclined sliding surface that can slide with the cylinder barrel inclined sliding surface on the side away from the inner cavity of the outer sleeve, and the side close to the inner cavity of the outer sleeve is connected to the output end of the wedge block pushing assembly so as to slide along the radial direction of the outer sleeve under the drive of the wedge block pushing assembly.

[0023] Furthermore, the wedge block pushing assembly includes:

[0024] An inner piston, the inner piston comprising a sealing section and a mounting section with an outer diameter smaller than that of the sealing section, the mounting section being slidably mounted in the inner cavity of the outer sleeve along the axial direction of the outer sleeve, the sealing section being integrally connected to a side of the mounting section close to the first oil hole, and a plurality of plunger mounting holes arranged along the axial direction of the outer sleeve are circumferentially spaced apart on an outer peripheral side of the sealing section corresponding to the mounting section;

[0025] A wedge sleeve, wherein the wedge sleeve is slidably sleeved on the outer side wall of the mounting section along the axial direction of the outer sleeve, the wedge sleeve is provided with a plurality of oil holes arranged along the axial direction of the outer sleeve at intervals in the circumferential direction, and a wedge sleeve inclined surface whose diameter gradually increases toward the first oil hole is provided on its outer side wall, and a second inclined sliding surface which is slidably matched with the wedge sleeve inclined surface is provided on the side of the wedge block close to the inner cavity of the outer sleeve;

[0026] A plurality of plungers are provided, each of the plungers corresponds to the plurality of plunger mounting holes one by one and is slidably mounted in the plunger mounting holes along the axial direction of the outer sleeve, and an end of each plunger away from the first oil hole can abut against an end of the wedge sleeve close to the first oil hole.

[0027] Furthermore, a limit stop ring is fixed on the outer wall of the mounting section near one end of the second oil hole, and an annular limit groove is provided on the end surface of the wedge sleeve near one end of the second oil hole and passes through its inner wall, and the limit stop ring can be clamped in the limit groove.

[0028] Furthermore, the inclination angle of the wedge sleeve inclined surface is 10°.

[0029] Furthermore, the inclined surface of the wedge sleeve is provided with a plurality of long strip sliding grooves arranged along its axial direction in length direction, and the second inclined sliding surface is formed with a plurality of sliding strips which are slidably matched with the long strip sliding grooves.

[0030] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a wellhead non-disassembly type rotary blowout preventer, which has the following beneficial effects:

[0031] 1. By setting up the oil distribution assembly, the rotating assembly and the hydraulic circuit can be automatically connected after the rotating assembly is installed in place, eliminating the need for repeated manual disassembly and assembly of hydraulic pipelines, avoiding manual high-altitude operations, and improving production efficiency and work safety.

[0032] 2. The oil cylinder with automatic locking function can realize mechanical automatic locking when closing and automatic unlocking before opening. There is no need to manually disassemble and assemble the locking bolts, which avoids manual high-altitude operations, saves manpower, and improves production efficiency and work safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0034] Figure 1 The present invention provides a schematic diagram of the overall structure of a wellhead non-disassembly type rotary blowout preventer.

[0035] Figure 2 A schematic diagram of the explosion structure of a wellhead non-disassembly type rotary blowout preventer provided by the present invention.

[0036] Figure 3 The present invention provides a cross-sectional structural diagram of a wellhead non-disassembly type rotary blowout preventer.

[0037] Figure 4 for Figure 3 A schematic diagram of the enlarged structure of part A.

[0038] Figure 5 for Figure 3 The enlarged structural diagram of part B is shown in the figure.

[0039] Figure 6 The present invention is a schematic cross-sectional structure diagram of the oil cylinder piston rod in a retracted and locked state.

[0040] Figure 7 This is another cross-sectional structural schematic diagram of the oil cylinder piston rod of the present invention in a retracted and locked state.

[0041] Figure 8 It is a schematic cross-sectional structure diagram of the oil cylinder piston rod of the present invention extending to the middle state.

[0042] Fig. 9 It is another cross-sectional structural schematic diagram of the oil cylinder piston rod of the present invention when it is extended to the middle state.

[0043] Fig.10 It is a schematic cross-sectional structure diagram of the oil cylinder piston rod of the present invention in a fully extended state.

[0044] Fig.11 Another cross-sectional structural schematic diagram of the oil cylinder piston rod of the present invention is in a fully extended state.

[0045] Fig.12 It is a schematic diagram of the oil cylinder explosion structure of the present invention.

[0046] Fig.13 It is a schematic diagram of the wedge sleeve structure of the present invention.

[0047] Fig.14 It is a schematic diagram of the wedge structure of the present invention.

[0048] In the figure:

[0049] 1. Shell;

[0050] 2. Rotating assembly, 21. Outer cylinder, 211. Oil inlet ring groove, 212. Oil return ring groove, 213. Oil return port, 214. Oil inlet port, 215. Oil inlet passage, 216. Oil return passage, 22. Rotating head, 23. Upper dynamic seal ring, 24. Lower dynamic seal ring, 25. Bearing;

[0051] 3. Oil distribution assembly, 31. Oil distribution ring, 311. Oil inlet hole, 312. Oil return hole, 32. Oil distribution ring fixing part, 321. Limiting protrusion;

[0052] 4. Clamp assembly, 41. Oil cylinder, 411. Cylinder barrel, 4111. Cylinder body, 41111. Cylinder barrel inclined sliding surface, 4112. First end cover, 41121. First oil port, 4113. Second end cover, 41131. Second oil port, 412. Piston rod, 4121. First shaft, 4122. Second shaft, 41221. Annular limit groove, 412211. Positioning block, 413. Outer sleeve, 4131. First sleeve, 41311. First oil hole, 4132. Second sleeve , 41321, second oil hole, 41322, sliding mouth, 414, wedge block, 4141, first inclined sliding surface, 4142, second inclined sliding surface, 41421, slide bar, 415, inner piston, 4151, sealing section, 41511, plunger mounting hole, 4152, mounting section, 4153, limit stop ring, 416, wedge sleeve, 4161, oil hole, 4162, wedge sleeve inclined surface, 41621, long strip slide groove, 417, plunger, 42, first hoop piece, 43, second hoop piece;

[0053] 5. Oil inlet pipe;

[0054] 6. Oil return pipe. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] See also Figure 1-Figure 14 The embodiment of the present invention discloses a wellhead non-disassembly type rotary blowout preventer, comprising:

[0059] Shell 1; a center hole is opened on the top of the shell 1;

[0060] The rotating assembly 2 comprises an outer cylinder 21 and a rotating head 22. The outer cylinder 21 is installed in the center hole. An upper dynamic sealing ring 23 is installed on the inner wall of the upper end of the outer cylinder 21, and a lower dynamic sealing ring 24 is installed on the inner wall of the lower end. The upper part of the rotating head 22 is rotatably installed in the outer cylinder 21, and a sealing cavity is formed between its outer wall and the upper dynamic sealing ring 23 and the lower dynamic sealing ring 24. A bearing 25 is installed at the outer wall of the rotating head 22 corresponding to the sealing cavity; an oil inlet groove 211 and an oil return groove 212 are provided at intervals along the axial direction of the outer wall of the outer cylinder 21, an oil return port 213 connected to the sealing cavity is provided on the upper part of the inner wall, an oil inlet port 214 connected to the sealing cavity is provided on the lower part, and an oil inlet channel 215 connecting the oil inlet groove 211 and the oil inlet port and an oil return channel 216 connecting the oil return groove 212 and the oil return port 213 are provided inside the side wall;

[0061] The oil distribution assembly 3, the upper part of the oil distribution assembly 3 is sleeved on the outer side wall of the outer cylinder 21, and the lower part is fixedly connected to the shell 1. The upper part of the oil distribution assembly 3 is provided with an oil inlet hole 311 connected to the oil inlet ring groove 211 and an oil return hole 312 connected to the oil return ring groove 212. The oil inlet hole 311 is connected to the oil inlet pipe 5, and the oil return hole 312 is connected to the oil return pipe 6.

[0062] In order to further optimize the above technical solution, the oil distribution assembly 3 includes an oil distribution ring 31 and a plurality of oil distribution ring fixings 32. The oil distribution ring 31 is sleeved on the outer wall of the outer cylinder 21, and the oil distribution ring 31 is provided with an oil inlet hole 311 connected to the oil inlet ring groove 211 and an oil return hole 312 connected to the oil return ring groove 212; the plurality of oil distribution ring fixings 32 are arranged at intervals along the circumferential direction of the oil distribution ring 31, and the top of each oil distribution ring fixing 32 is connected to the bottom of the oil distribution ring 31, and a limiting protrusion 321 is formed at the bottom, and a limiting groove connected to the limiting protrusion 321 is provided on the outer wall of the housing 1. The oil distribution ring 31 is fixed to the housing 1 through the oil distribution ring fixing 32 and is firmly installed.

[0063] In order to further optimize the above technical solution, the limiting protrusion 321 is fixed in the limiting groove by screws to enhance the firmness of the installation of the oil distribution assembly 3.

[0064] In order to further optimize the above technical solution, a clamp assembly 4 is further provided, which includes an oil cylinder 41 and a first hoop piece 42 and a second hoop piece 43 connected in a buckle-type manner, wherein one end of the first hoop piece 42 is hingedly connected to the fixed end of the oil cylinder 41, and one end of the second hoop piece 43 is hingedly connected to the other end of the first hoop piece 42, and the other end is hingedly connected to the movable end of the oil cylinder 41;

[0065] The first hoop piece 42 has the same structure as the second hoop piece 43, and a through slot is formed on the inner wall corresponding to the oil distribution ring fixing piece 32, and a lower annular clamping protrusion is formed on the lower part of the inner wall, and an upper annular clamping groove is formed on the upper part. A lower annular clamping groove that is engaged with the lower annular clamping protrusion is formed on the upper part of the corresponding limit groove of the outer wall of the shell 1, and an upper annular clamping protrusion that is engaged with the upper annular clamping groove is formed on the outer wall of the outer cylinder 21. The outer cylinder 21 and the shell 1 are locked by the clamp assembly 4.

[0066] In order to further optimize the above technical solution, the oil cylinder 41 includes:

[0067] The cylinder 411 is a cylindrical structure with both ends closed, with a first oil port 41121 opened at one end and a second oil port 41131 opened at the other end; the first hoop 42 is hinged on the outer wall of the cylinder 411 near the second oil port 41131;

[0068] The piston assembly has one end which is slidably installed in the inner cavity of the cylinder 411 along the axial direction of the cylinder 411 , and the other end which passes through the end of the other end of the cylinder 411 and is hinged to the second hoop 43 .

[0069] The cylinder 411 comprises a cylinder body 4111 and a first end cover 4112 and a second end cover 4113 respectively mounted at two ends of the cylinder body. The first end cover 4112 is provided with a first oil port 41121, the second end cover 4113 is provided with a second oil port 41131, and the first hoop 42 is hinged to the second end cover 4113.

[0070] The hydraulic cylinder in the prior art only relies on the pressure of the hydraulic oil to push the piston rod to move, and after the piston rod slides into place, the hydraulic oil pressure needs to be maintained stable to ensure that the piston rod stops at the set position. Once the hydraulic oil changes, the piston will slide, which may cause the clamp to fail to clamp. Therefore, in order to further optimize the above technical solution, the piston assembly includes:

[0071] A piston rod 412, one end of which is slidably installed in the inner cavity of the cylinder 411 along the axial direction of the cylinder 411, and the other end of which passes through the end wall of the cylinder 411 close to the first oil port 41121 and is hinged to the second hoop 43;

[0072] The outer sleeve 413 is a cylindrical structure with closed ends, which is fixed to one end of the piston rod 412 corresponding to the cylinder 411, and its outer wall is slidably connected to the inner wall of the cylinder 411; the outer sleeve 413 is provided with a plurality of first oil holes 41311 at one end close to the first oil port 41121, and a plurality of second oil holes 41321 at one end close to the second oil port 41131; a plurality of sliding openings 41322 communicating with its inner cavity are circumferentially spaced on the side wall of the outer sleeve 413;

[0073] A wedge block pushing assembly, which is slidably installed in the inner cavity of the outer sleeve 413 along the axial direction of the cylinder 411;

[0074] A plurality of wedge blocks 414 are provided, and a cylinder inclined sliding surface 41111 whose inner diameter gradually decreases toward the direction away from the second oil port 41131 is provided on the inner wall of the cylinder body 4111 near the second oil port 41131. The plurality of wedge blocks 414 correspond one-to-one to the plurality of sliding openings 41322 and are slidably installed in the sliding openings 41322 along the radial direction of the outer sleeve 413. In addition, a first inclined sliding surface 4141 which can slide with the cylinder inclined sliding surface 41111 is provided on the side away from the inner cavity of the outer sleeve 413, and the side close to the inner cavity of the outer sleeve 413 is connected to the output end of the wedge pushing assembly so as to slide along the radial direction of the outer sleeve 413 under the drive of the wedge pushing assembly.

[0075] The piston rod 412 is a stepped shaft, which includes a first shaft 4121 and a second shaft 4122 with an outer diameter smaller than the first shaft 4121. One end of the first shaft 4121 is hinged to the second hoop plate 43, and the other end is integrally connected to the second shaft 4122, and a shaft shoulder is formed at the connection with the second shaft 4122; an annular limiting groove 41221 is provided on the side wall of the other end of the second shaft 4122, and the outer sleeve 413 is sleeved on the second shaft 4122, and the end face of one end thereof is in contact with the shaft shoulder, and the other end is provided with a limiting ring that is clamped with the annular limiting groove 41221.

[0076] In order to further optimize the above technical scheme, the outer sleeve 413 includes a first sleeve 4131 and a second sleeve 4132. The first sleeve 4131 and the second sleeve 4132 are both cylindrical structures with one end open. The first sleeve 4131 and the second sleeve 4132 are arranged with their openings facing each other. The first sleeve 4131 is sleeved on the second shaft 4122 and its closed end abuts against the shaft shoulder. A plurality of first oil holes 41311 are circumferentially spaced apart at the closed end of the first sleeve 4131; the open end of the second sleeve 4132 abuts against the end wall of the open end of the first sleeve 4131, and a plurality of second oil holes 41321 are circumferentially spaced apart at the closed end. A limiting ring 41323 is arranged at the closed end of the second sleeve 4132, and a plurality of sliding openings 41322 are circumferentially spaced apart on the side wall of the second sleeve 4132.

[0077] A plurality of positioning blocks 412211 are fixed at intervals in the circumferential direction on the bottom of the annular limiting groove 41221, and a plurality of positioning grooves which are positioned and connected to the positioning blocks 412211 are circumferentially arranged on the limiting ring 41323 to prevent relative rotation between the outer sleeve 413 and the piston rod.

[0078] In order to further optimize the above technical solution, the second sleeve 4132 is formed by circumferentially splicing a plurality of arc-shaped structural plates, so that the second sleeve 4132 can be sleeved on the second shaft 4122 .

[0079] In order to further optimize the above technical solution, the wedge block pushing assembly includes:

[0080] The inner piston 415 includes a sealing section 4151 and a mounting section 4152 whose outer diameter is smaller than that of the sealing section 4151. The mounting section 4152 is slidably mounted in the inner cavity of the outer sleeve 413 along the axial direction of the outer sleeve 413. The sealing section 4151 is integrally connected to a side of the mounting section 4152 close to the first oil hole 41311, and a plurality of plunger mounting holes 41511 arranged along the axial direction of the outer sleeve 413 are circumferentially spaced apart on the outer peripheral side of the sealing section 4151 corresponding to the mounting section 4152; wherein the sealing section 4151 and the mounting section 4152 are both sleeve-like structures, which can be slidably mounted on the second shaft 4122 to improve the stability of the inner piston 415 during sliding.

[0081] The wedge sleeve 416 is slidably sleeved on the outer wall of the mounting section 4152 along the axial direction of the outer sleeve 413. The wedge sleeve 416 is provided with a plurality of oil holes 4161 arranged along the axial direction of the outer sleeve 413 at intervals in the circumferential direction, and a wedge sleeve inclined surface 4162 whose diameter gradually increases toward the first oil hole 41311 is provided on its outer wall. The wedge block 414 is provided with a second inclined sliding surface 4142 that is slidably matched with the wedge sleeve inclined surface 4162 on the side close to the inner cavity of the outer sleeve 413;

[0082] A plurality of plungers 417 correspond one-to-one to a plurality of plunger mounting holes 41511 and are slidably installed in the plunger mounting holes 41511 along the axial direction of the outer sleeve 413, and one end of each plunger 417 away from the first oil hole 41311 can abut against the end of the wedge sleeve 416 close to the first oil hole 41311.

[0083] In order to further optimize the above technical solution, a limiting stop ring 4153 is fixed on the outer wall of the installation section 4152 near one end of the second oil hole 41321, and an annular limiting groove is provided on the end face of the wedge sleeve 416 near one end of the second oil hole 41321 and passes through its inner wall. The limiting stop ring 4153 can be clamped in the limiting groove to limit the wedge sleeve 416 so that the wedge sleeve 416 can slide with the inner piston.

[0084] In order to further optimize the above technical solution, the optimal inclination angle of the wedge sleeve inclined surface 4162 is 10°, so as to realize self-locking between the wedge block 414, the wedge sleeve 416 and the cylinder barrel 411.

[0085] In order to further optimize the above technical solution, Figure 12-14 As shown, the inclined surface 4162 of the wedge sleeve is provided with a plurality of long strip slide grooves 41621 arranged along its axial direction, and the second inclined sliding surface 4142 is formed with a plurality of slide bars 41421 that slide with the long strip slide grooves 41621. It is ensured that the wedge block 414 can only slide along the axial direction of the cylinder 411, and at the same time, the toothed sliding matching structure formed by the plurality of slide bars 41421 and the plurality of long strip slide grooves 41621 increases the contact area between the wedge sleeve 416 and the wedge block 414, increases the friction force, so as to realize self-locking at a larger tilt angle, shorten the stroke, and make the structure more compact.

[0086] Working principle:

[0087] The equipment needs to be installed at the wellhead before work. During installation, except for the rotating assembly 2, other components are installed as a whole on the wellhead drilling equipment. After the equipment is in place, the oil pipelines of the oil cylinder 41 and the oil distribution assembly 3 are installed. The rotating assembly 2 is lowered with the drilling tool and is ready to be installed in place. Figure 2As shown, at this time, the piston rod 412 of the oil cylinder 41 is in an extended state, which drives the clamp assembly 4 to be in an open state. When the rotating assembly 2 continues to fall, its front end will pass through the oil distribution assembly 3 and the clamp assembly 4 and abut against the housing 1;

[0088] After the rotating assembly 2 falls into place, the hydraulic device is operated to retract the piston rod 412 of the oil cylinder 41, driving the clamp assembly 4 to close to clamp the rotating assembly 2. At this time, the positions of the various components are as follows: Figure 1 As shown;

[0089] After the rotating assembly 2 is installed in place, the oil circuit inside it is automatically connected through the oil distribution ring 31, and no manual connection is required. The oil circuit is as follows: the oil in the oil inlet pipe enters through the oil inlet hole 311, enters the oil inlet ring groove 211 through the oil inlet hole 311, and then enters the sealing cavity through the oil inlet port 214, flows upward from the bottom of the rotating control assembly through all bearings 25, cools and lubricates the bearings 25, enters the oil return ring groove 212 through the oil return port 213, and then flows to the oil return pipe through the oil return hole 312.

[0090] When it is necessary to lift the rotating assembly 2 to replace wearing parts, the oil circuit will be interrupted. In order to reduce environmental pollution and waste of resources, after shutdown, compressed air is used to blow the oil stored in the inner cavity of the rotating assembly 2 into the oil tank before opening the clamp assembly 4 and lifting the rotating assembly 2.

[0091] After the piston rod 412 of the oil cylinder 41 is retracted to close the clamp assembly 4, the mechanical locking at this position can be automatically realized. At this time, even if the hydraulic pressure disappears, the piston rod 412 will not be loosened. The reverse oil pressure must be operated to unlock the internal mechanism before the piston rod 412 can be extended, so that the mechanism no longer needs to be manually locked, and the function of disassembly-free wellhead is realized;

[0092] Figure 6 , Figure 7It is a cross-sectional view of the cylinder 41 in the automatic locking state after the piston rod is retracted. It works as follows: the pressure oil enters the rod chamber through the first oil port 41121, the piston rod 412 is retracted, the driving clamp assembly 4 is closed, and the pressure oil in the rod chamber enters the inner chamber of the outer sleeve 413 through the first oil hole 41311 on the outer sleeve 413, acts on the end face of the sealing section 4151 of the inner piston 415, and pushes the inner piston 415 to move left until the end face of the mounting section 4152 of the inner piston 415 abuts against the inner end wall of the outer sleeve 413. During the process of the inner piston 415 moving left, the end face of the wedge sleeve 416 abuts against the side of the sealing section 4151 away from the rod chamber, and the pressure oil does not contact the wedge sleeve 416, so that there is no relative movement between the wedge sleeve 416 and the inner piston 415. When the inner piston 415 moves to the left end and abuts against the end wall of the cylinder 411, the pressure oil can no longer push the inner piston 415 to the left. At this time, the pressure oil acts on the plunger 417, pushing the plunger 417 to move left. The left movement of the plunger 417 pushes the wedge sleeve 416 to move left. Because the wedge block 414 is movably mounted in the sliding mouth and is constrained by the sliding mouth to only move radially, when the wedge sleeve 416 moves to the left, the second inclined sliding surface 4142 and the inclined surface 4162 of the wedge sleeve will cooperate to cause the wedge block 414 to expand radially outward until the first inclined sliding surface 4141 of the wedge block 414 abuts against the inclined sliding surface 41111 of the cylinder. Since the second inclined surface and the wedge sleeve inclined surface 4162 are self-locking inclined angles, the wedge block 414, the cylinder inclined sliding surface 41111 and the wedge sleeve inclined surface 4162 form a self-locking inclined surface mechanism. At this time, even if the hydraulic pressure disappears, the rightward reaction force from the piston rod 412 acts on the outer sleeve 413. Since the mechanism is in a self-locking state, the outer sleeve 413 will not move to the right, so the piston rod 412 will not move to the right, and the clamp assembly hinged to the piston rod 412 will not loosen. The piston rod 412 is in a mechanically locked state at this position.

[0093] When the clamp assembly needs to be opened, the reversing valve needs to be operated to reverse the oil circuit of the oil cylinder 41. At this time, the pressure oil enters the rodless chamber of the cylinder barrel 411 from the second oil port 41131, and the oil in the rod chamber returns to the oil tank through the second oil port 41131. Figure 8 , Fig. 9, the pressure oil enters the inner cavity of the outer sleeve 413 through the second oil hole 41321, acts on the inner piston 415 to make the inner piston 415 move right. Since the limit stop ring 4153 on the inner piston 415 is engaged with the annular limit groove on the wedge sleeve 416, when the inner piston 415 continues to move right, it will pull the wedge sleeve 416 to move right together until the sealing section 4151 abuts against the inner end surface of the outer sleeve 413. At this time, the wedge block 414 is no longer affected by the expansion effect of the wedge sleeve 416 and can be retracted into the inner cavity of the outer sleeve 413 along the sliding mouth. As shown in the figure, the piston assembly completes the unlocking of the mechanism. Under the action of oil pressure, the piston assembly continues to move to the right until the piston rod 412 is fully extended, and the clamp assembly hinged to the piston rod 412 is also fully opened. When the piston rod 412 is fully extended, the state of its internal components is as follows Fig.10 , Fig.11 As shown;

[0094] When the reversing valve is operated again to reverse the oil circuit and close the clamp assembly, the internal parts of the piston assembly are in the following state: Figure 6 , Figure 7 As shown, the pressure oil enters the rod chamber through the first oil port 41121, pushing the piston assembly to complete self-locking, so that the piston rod 412 is retracted and mechanical locking is achieved.

[0095] During the mechanical locking process, the power for the movement of the wedge sleeve 416 comes from the driving force of the plunger 417. Since the diameter of the plunger 417 is small, the locking force it generates is small, and the smaller force can reduce the wear of parts during movement; when the mechanism is unlocked, the power for the movement of the wedge sleeve 416 comes from the driving force of the inner piston 415. Compared with when the pressure oil acts on the end face of the plunger 417, the pressure oil acts on the end face of the inner piston 415. The effective area is larger and the unlocking force provided is also larger, thereby avoiding unlocking failure and improving the reliability of the mechanism.

[0096] After the rotary blowout preventer of the present invention is installed in place, during the entire working period, when it is necessary to lift the rotating assembly 2 to replace wearing parts, or to lower the rotating assembly 2 for installation in place, the hydraulic circuit can be automatically connected through the oil distribution assembly 3, and the clamp assembly 4 can also be automatically unlocked and locked by the oil cylinder 41, and it is no longer necessary to manually go to the wellhead for high-altitude disassembly and assembly operations, thereby realizing manual disassembly and assembly, and greatly improving production efficiency and work safety.

[0097] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0098] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wellhead non-disassembly type rotary blowout preventer, characterized in that: include: A shell (1); a center hole is formed on the top of the shell (1); The rotating assembly (2) comprises an outer cylinder (21) and a rotating head (22), wherein the outer cylinder (21) is installed in the center hole, an upper dynamic sealing ring (23) is installed on the inner wall of the upper end of the outer cylinder (21), and a lower dynamic sealing ring (24) is installed on the inner wall of the lower end of the outer cylinder (21), and the upper part of the rotating head (22) is rotatably installed in the outer cylinder (21), and a sealing cavity is formed between the outer wall of the rotating head (22) and the upper dynamic sealing ring (23) and the lower dynamic sealing ring (24), and the outer wall of the rotating head (22) is installed at a position corresponding to the sealing cavity. A bearing (25) is installed; an outer wall of the outer cylinder (21) is provided with an oil inlet ring groove (211) and an oil return ring groove (212) spaced apart in the axial direction thereof; an upper portion of the inner wall is provided with an oil return port (213) connected to the sealing cavity; a lower portion is provided with an oil inlet port (214) connected to the sealing cavity; and an oil inlet passage (215) connecting the oil inlet ring groove (211) and the oil inlet port (214) and an oil return passage (216) connecting the oil return ring groove (212) and the oil return port (213) are provided inside the side wall; An oil distribution assembly (3), wherein the upper portion of the oil distribution assembly (3) is sleeved on the outer side wall of the outer cylinder (21), and the lower portion is connected to the housing (1); the upper portion of the oil distribution assembly (3) is provided with an oil inlet hole (311) connected to the oil inlet ring groove (211) and an oil return hole (312) connected to the oil return ring groove (212); the oil inlet hole (311) is connected to the oil inlet pipe (5), and the oil return hole (312) is connected to the oil return pipe (6).

2. A wellhead non-disassembly type rotary blowout preventer according to claim 1, characterized in that: The oil distribution assembly (3) comprises an oil distribution ring (31) and a plurality of oil distribution ring fixing members (32); the oil distribution ring (31) is sleeved on the outer wall of the outer cylinder (21), and the oil distribution ring (31) is provided with an oil inlet hole (311) connected to the oil inlet ring groove (211) and an oil return hole (312) connected to the oil return ring groove (212); the plurality of oil distribution ring fixing members (32) are arranged at intervals along the circumferential direction of the oil distribution ring (31), and the top of each of the oil distribution ring fixing members (32) is connected to the bottom of the oil distribution ring (31), and a limiting protrusion (321) is formed on the bottom; and a limiting groove corresponding to each limiting protrusion (321) and connected to the limiting protrusion (321) is provided on the outer wall of the housing (1).

3. A wellhead non-disassembly type rotary blowout preventer according to claim 2, characterized in that: The limiting protrusion (321) is fixed in the limiting groove by means of screws.

4. The wellhead non-disassembly type rotary blowout preventer according to claim 2, characterized in that: A clamp assembly (4) is also provided, the clamp assembly (4) comprising an oil cylinder (41) and a first hoop piece (42) and a second hoop piece (43) connected in a buckle-type manner, one end of the first hoop piece (42) being hingedly connected to a fixed end of the oil cylinder (41), one end of the second hoop piece (43) being hingedly connected to the other end of the first hoop piece (42), and the other end being hingedly connected to a movable end of the oil cylinder (41); The first hoop plate (42) and the second hoop plate (43) have the same structure, and a through-notch is formed on the inner wall thereof corresponding to the oil distribution ring fixing member (32), and a lower annular clamping protrusion is formed on the lower part of the inner wall thereof, and an upper annular clamping groove is formed on the upper part thereof, and a lower annular clamping groove is formed on the outer wall of the housing (1) corresponding to the upper part of the limit groove and is engaged with the lower annular clamping protrusion, and an upper annular clamping protrusion is formed on the outer wall of the outer cylinder (21) and is engaged with the upper annular clamping groove.

5. The wellhead non-disassembly type rotary blowout preventer according to claim 4, characterized in that: The oil cylinder (41) comprises: A cylinder barrel (411), the cylinder barrel (411) being a cylindrical structure with both ends closed, a first oil port (41121) being provided at one end thereof, and a second oil port (41131) being provided at the other end thereof; the first hoop (42) being hingedly connected to an outer wall of the cylinder barrel (411) at one end thereof close to the second oil port (41131); A piston assembly, one end of which is slidably mounted in the inner cavity of the cylinder (411) along the axial direction of the cylinder (411), and the other end of which passes through the end of the other end of the cylinder (411) and is hinged to the second hoop (43).

6. The wellhead non-disassembly type rotary blowout preventer according to claim 5, characterized in that: The piston assembly comprises: a piston rod (412), one end of the piston rod (412) being slidably mounted in the inner cavity of the cylinder barrel (411) along the axial direction of the cylinder barrel (411), and the other end of the piston rod (412) passing through an end wall of the cylinder barrel (411) close to one end of the first oil port (41121) and being hingedly connected to the second hoop plate (43); An outer sleeve (413), the outer sleeve (413) being a cylindrical structure with both ends closed, fixed to one end of the piston rod (412) corresponding to the cylinder (411), and having an outer wall slidably connected to the inner wall of the cylinder (411); a plurality of first oil holes (41311) are provided at one end of the outer sleeve (413) close to the first oil port (41121), and a plurality of second oil holes (41321) are provided at one end of the outer sleeve (413) close to the second oil port (41131); a plurality of sliding openings (41322) communicating with the inner cavity thereof are circumferentially spaced apart on the side wall of the outer sleeve (413); a wedge pushing assembly, the wedge pushing assembly being slidably mounted in the inner cavity of the outer sleeve (413) along the axial direction of the cylinder (411); A plurality of wedge blocks (414) are provided, on the side of the inner wall of the cylinder (411) close to the second oil port (41131), with a cylinder inclined sliding surface (41111) whose inner diameter gradually decreases in the direction away from the second oil port (41131); the plurality of wedge blocks (414) correspond one-to-one to the plurality of sliding ports (41322) and are slidably installed in the sliding ports (41322) along the radial direction of the outer sleeve (413); a first inclined sliding surface (4141) slidably matched with the cylinder inclined sliding surface (41111) is provided on the side away from the inner cavity of the outer sleeve (413); and the side close to the inner cavity of the outer sleeve (413) is connected to the output end of the wedge block pushing assembly so as to slide along the radial direction of the outer sleeve (413) under the drive of the wedge block pushing assembly.

7. The wellhead non-disassembly type rotary blowout preventer according to claim 6, characterized in that: The wedge block pushing assembly comprises: an inner piston (415), the inner piston (415) comprising a sealing section (4151) and a mounting section (4152) having an outer diameter smaller than that of the sealing section (4151); the mounting section (4152) is slidably mounted in the inner cavity of the outer sleeve (413) along the axial direction of the outer sleeve (413); the sealing section (4151) is integrally connected to a side of the mounting section (4152) close to the first oil hole (41311); and a plurality of plunger mounting holes (41511) arranged along the axial direction of the outer sleeve (413) are circumferentially spaced apart on the outer circumferential side of the sealing section (4151) corresponding to the mounting section (4152); A wedge sleeve (416), the wedge sleeve (416) being slidably sleeved on the outer wall of the mounting section (4152) along the axial direction of the outer sleeve (413), the wedge sleeve (416) being provided with a plurality of oil holes (4161) arranged along the axial direction of the outer sleeve (413) at intervals in the circumferential direction, and a wedge sleeve inclined surface (4162) whose diameter gradually increases in a direction approaching the first oil hole (41311) being provided on the outer wall thereof, and a second inclined sliding surface (4142) being slidably matched with the wedge sleeve inclined surface (4162) being provided on a side of the wedge block (414) close to the inner cavity of the outer sleeve (413); A plurality of plungers (417), the plurality of plungers (417) corresponding one to one with the plurality of plunger mounting holes (41511) and slidably mounted in the plunger mounting holes (41511) along the axial direction of the outer sleeve (413), and an end of each plunger (417) away from the first oil hole (41311) abuts against an end of the wedge sleeve (416) close to the first oil hole (41311).

8. The wellhead non-disassembly type rotary blowout preventer according to claim 7, characterized in that: A limit stop ring (4153) is fixed on the outer wall of the mounting section (4152) near the second oil hole (41321), and an annular limit groove is provided on the end surface of the wedge sleeve (416) near the second oil hole (41321) and passes through the inner wall thereof, and the limit stop ring (4153) is clamped in the limit groove.

9. The wellhead non-disassembly type rotary blowout preventer according to claim 7, characterized in that: The inclination angle of the wedge sleeve inclined surface (4162) is 10°.

10. The wellhead non-disassembly type rotary blowout preventer according to claim 7, characterized in that: The wedge sleeve inclined surface (4162) is provided with a plurality of long strip sliding grooves (41621) arranged along its axial direction in the length direction, and the second inclined sliding surface (4142) is formed with a plurality of sliding strips (41421) that slidably cooperate with the long strip sliding grooves (41621).

Images