A hydraulic ring light sleeve head outer clamping quick connecting device

Abstract

The present application relates to a kind of hydraulic annular light casing head outer clamping quick coupling device, to solve the prior art only applicable to the wellhead without pipe string in casing, and installation difficult, long installation time when using problem, it includes hydraulic drive unit and clamping unit;Hydraulic drive unit includes shell assembly, annular piston and lower piston assembly;Annular piston and lower piston assembly can move up and down in shell assembly interior to drive clamping unit clamping or loose clamping the light casing head being connected;Clamping unit includes spring seat and annular split slip;Shell assembly, annular piston and spring seat form first clamping hydraulic cavity, shell assembly and lower piston assembly form second clamping hydraulic cavity;Shell assembly and annular piston and lower piston assembly form first loose clamping hydraulic cavity and second loose clamping hydraulic cavity respectively, and it is equipped with clamping oil hole and loose clamping oil hole on it;Annular split slip is set in annular piston, and annular piston and lower piston assembly drive annular split slip to contract or open.

Description

TECHNICAL FIELD

[0001] The present application relates to a quick external clamping connection device for oilfield well control emergency, in particular to a hydraulic annular light casing head external clamping quick connection device. BACKGROUND

[0002] In the oilfield operation site, in two cases, if oil, water, gas well blowout, well gushing or fire accident occurs, special equipment is needed to control the well to reduce losses: one is that the wellhead has a wellhead device, if the wellhead device fails, it cannot shut down the well and cannot be repaired, the conventional method is to use hydraulic cutting to cut off the wellhead device from the casing at the flange of the wellhead, remove the wellhead device, expose the light casing head, and then use coiled tubing equipment or pressure operation equipment to control the blowout; the other is the casing blowout accident during casing operation. The patent document CN202010456727.6 discloses a hydraulic annular light casing head internal plugging clamping connection device. The device uses a light casing internal clamping device to insert into the wellhead casing without a pipe string and connect with other well control equipment to control the blowout. However, the device must be inserted into the casing when in use, and is only suitable for wellheads without pipe strings in the casing. At the same time, due to the small channel of the device, the device will encounter a lot of resistance during the process of falling to the preset installation position, making the installation difficult and time-consuming. SUMMARY

[0003] The purpose of the present application is to solve the technical problems of the prior art, which is only suitable for wellheads without pipe strings in the casing, and encounters a lot of resistance during the process of falling to the preset installation position when in use, making the installation difficult and time-consuming. The present application provides a hydraulic annular light casing head external clamping quick connection device, which can quickly connect with the exposed casing outside the wellhead in the case of light casing blowout, well gushing and fire, so that it can normally connect other well control equipment, thereby achieving the purpose of fast, safe and efficient control of blowout accidents.

[0004] To achieve the above purpose, the technical solution provided by the present application is:

[0005] A hydraulic annular light casing head external clamping quick connection device, characterized in that:

[0006] It comprises a hydraulic drive unit and a clamping unit;

[0007] The hydraulic drive unit comprises a housing assembly, an annular piston and a lower piston assembly arranged in the housing assembly; the annular piston and the lower piston assembly can move up and down inside the housing assembly to drive the clamping unit to clamp or unclamp the connected casing head;

[0008] The clamping unit comprises a spring seat arranged inside the housing assembly and an annular split slip sleeve arranged in the spring seat, the lower part of the annular split slip sleeve is provided with a split slip paw, the inner wall of the split slip paw is provided with a slip tooth, and the upper part of the annular split slip sleeve is provided with a floating ring.

[0009] The upper surface of the annular piston and the lower part of the spring seat jointly form a first clamping hydraulic cavity, and the second clamping hydraulic cavity is formed between the housing assembly and the lower part of the lower piston assembly.

[0010] The housing assembly, the lower part of the annular piston and the upper part of the lower piston assembly form a first slip clamping hydraulic cavity and a second slip clamping hydraulic cavity, respectively.

[0011] The housing assembly is provided with a clamping oil hole and a slip clamping oil hole, the clamping oil hole is in communication with the first clamping hydraulic cavity and the second clamping hydraulic cavity, and the slip clamping oil hole is in communication with the first slip clamping hydraulic cavity and the second slip clamping hydraulic cavity.

[0012] The annular split slip sleeve is arranged in the annular piston, and the annular piston and the lower piston assembly can drive the annular split slip sleeve to contract or expand.

[0013] Further, the housing assembly comprises, in sequence from top to bottom along the axial direction, a wellhead large four-way joint, a transition flange, a main housing and a lower annular cover plate.

[0014] Further, the outer wall of the split slip paw is provided with a first outer taper surface and a second outer taper surface, the lower part of the inner wall of the annular piston is provided with a first inner taper surface matched with the first outer taper surface, and the upper part of the inner wall of the lower piston assembly is provided with a second inner taper surface matched with the second outer taper surface.

[0015] Further, the spring seat is sealingly connected with the inner hole wall of the transition flange, an elastic member is arranged between the spring seat and the floating ring, the elastic member can provide the floating ring with an upward elastic force to push the annular split slip sleeve upward, and the total pushing force of the elastic member is greater than three times the sum of the mass of the floating ring and the annular split slip sleeve.

[0016] Further, the elastic member is a compression spring, the spring seat is provided with a spring accommodating cavity, the upper part of the compression spring abuts against the bottom surface of the floating ring, and the lower part of the compression spring abuts against the bottom surface of the spring accommodating cavity.

[0017] Further, the lower piston assembly comprises an upper special-shaped annular piston and a lower special-shaped annular piston, the upper special-shaped annular piston is irregularly shaped, an annular sealing rubber sleeve is arranged between the upper special-shaped annular piston and the lower special-shaped annular piston, the upper part of the upper special-shaped annular piston is provided with a second inner taper surface, the lower part of the upper special-shaped annular piston is provided with a groove matched with the upper part of the annular sealing rubber sleeve, the upper part of the upper special-shaped annular piston is provided with a third guide section, the third guide section is arranged in the inside of the main housing and has an outer diameter matched with the inner diameter of the corresponding position of the main housing, and the upper part of the lower special-shaped annular piston is provided with a groove matched with the lower part of the annular sealing rubber sleeve.

[0018] Further, a locking valve is further included, two front oil ports of the locking valve are communicated with the inlet and outlet of the external hydraulic station respectively; two rear oil ports of the locking valve are connected with the clamping oil hole and the unclamping oil hole respectively.

[0019] Further, the shell assembly is internally provided with a first oil channel and a second oil channel, the first oil channel is communicated with the clamping oil hole, the first clamping hydraulic cavity and the second clamping hydraulic cavity respectively; the second oil channel is communicated with the unclamping oil hole, the first unclamping hydraulic cavity and the second unclamping hydraulic cavity respectively.

[0020] Further, the lower part of the spring seat is provided with a first guide section, the annular piston sleeve is arranged outside the first guide section, and the outer diameter of the first guide section is matched with the inner hole diameter of the annular piston;

[0021] The upper part of the upper annular piston is provided with a third guide section, the third guide section is sleeved inside the main shell, and the outer diameter is matched with the inner diameter of the corresponding position of the main shell.

[0022] Further, the upper part of the lower annular cover plate is provided with a second guide section, the lower special-shaped annular piston is sleeved outside the second guide section, and the outer diameter of the second guide section is matched with the inner diameter of the lower special-shaped annular piston.

[0023] The beneficial effects of the present application are:

[0024] 1、In the present application, when the casing is in the light casing state, the casing can be quickly clamped and connected with the outer wall of the casing in the case of blowout, well surge, and fire, so that it can be normally connected with other well control equipment, thereby achieving the purpose of fast, safe and efficient control of blowout accidents, avoiding the loss of formation energy caused by long-time blowout, and reducing environmental pollution;

[0025] 2、The annular piston of the present application is floating, even in the use process of the hydraulic full-seal ram preventer, the upward force of the well pressure on the whole device gradually increases, causing the whole device to move upward, the slips of the annular piston will tightly engage on the outer wall of the casing, and the engagement force will increase with the increase of the upward force;

[0026] 3、The present application can be applied to wellheads without pipe columns in the casing, and can also be applied to wellheads with pipe columns in the casing, and has a wider application range, and because the channel of the present application is larger, it can play a role in guiding the upwelling liquid in the well, and can fall to the preset installation position quickly and conveniently. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is the cross section of the embodiment of the present application Figure 1 (the state of the slip not clamping the light casing head);

[0028] Figure 2is the profile structure schematic diagram of the embodiment of the present application;

[0029] Figure 3 is the structure schematic diagram of the split claw in the embodiment of the present application;

[0030] Figure 4 is the profile of the embodiment of the present application Figure 2 (the sealing state of the slip tight casing head);

[0031] Figure 5 is the connection schematic diagram of the embodiment of the present application and other functional components and external hydraulic control devices.

[0032] The reference signs are as follows:

[0033] 1 - housing assembly, 101 - large four-way, 102 - transition flange, 103 - main housing, 104 - lower annular cover plate, 105 - first oil passage, 106 - second oil passage, 2 - annular piston, 3 - lower piston assembly, 301 - upper special-shaped annular piston, 3011 - third guide section, 302 - annular sealing rubber sleeve, 303 - lower special-shaped annular piston, 304 - second inner taper surface, 41 - first clamping hydraulic cavity, 42 - second clamping hydraulic cavity, 51 - first unclamping hydraulic cavity, 52 - second unclamping hydraulic cavity, 6 - clamping oil hole, 7 - unclamping oil hole, 8 - annular split slip, 81 - split claw, 82 - slip tooth, 83 - first outer taper surface, 84 - second outer taper surface, 9 - floating ring, 10 - spring seat, 1001 - spring accommodating cavity, 1002 - first guide section, 1041 - second guide section, 11 - elastic member, 12 - locking valve, 13 - light casing, 14 - blowout valve, 15 - well killing valve, 16 - hydraulic full seal ram preventer, 17 - ignition tube, 18 - remote hydraulic control console, 21 - first inner taper surface. DETAILED DESCRIPTION

[0034] The annular space formed between the lower inner hole of the hydraulic external clamping quick connecting device of the annular optical casing head and the optical casing is provided with a set of annular split slips with teeth on the inner wall, and when the annular split slips are in a free state, the inner hole formed has a diameter greater than the outer diameter of the casing, so that the quick connecting device can smoothly pass through the casing when falling; the axial relative movement of the first inner conical surface 21 and the second outer conical surface 84 pushes the slip body to contract radially, and then the slip teeth 82 tightly engage the outer wall of the casing, forming the rooting place of the quick connecting device; the annular sealing rubber sleeve 302 is arranged between the upper special-shaped annular piston 301 and the lower special-shaped annular piston 303, and after being extruded by the first inner conical surface 21 and the second outer conical surface 84, the annular sealing rubber sleeve 302 contracts inward, the inner hole of the rubber sleeve becomes smaller, thereby sealing the outer wall of the casing, so that the high-pressure fluid in the well cannot be sprayed out from the outer wall of the casing. The axial relative movement of the first inner conical surface 21 and the second outer conical surface 84 is pushed by the upper special-shaped annular piston 301 and the lower special-shaped annular piston 303 inside the device, and the movement of the upper special-shaped annular piston 301 and the lower special-shaped annular piston 303 is realized by the hydraulic power of the external remote hydraulic control device. The greater the external remote hydraulic pressure, the greater the thrust of the first inner conical surface 21 and the second outer conical surface 84, and the more reliable the slip teeth 82 tightly bite the outer wall of the casing.

[0035] Referring to Figure 1 、 Figure 2 、 Figure 3 , the application provides a hydraulic external clamping quick connecting device of an annular optical casing head, which comprises a hydraulic drive unit and a clamping unit. The hydraulic drive unit comprises a shell assembly 1, an annular piston 2 arranged in the shell assembly 1 and a lower piston assembly 3. The annular piston 2 and the lower piston assembly 3 can move up and down inside the shell assembly 1 to drive the clamping unit to clamp the casing head 13. The clamping unit comprises a spring seat 10 arranged inside the shell assembly 1 and an annular split slip 8 sleeved in the spring seat 10, and the lower part of the annular split slip 8 is provided with a split claw 81, and the inner wall of the split claw 81 is provided with slip teeth 82.

[0036] Specifically, the shell assembly 1 comprises a wellhead large four-way joint 101, a transition flange 102, a main shell 103 and a lower annular cover plate 104 which are sequentially connected in the axial direction from top to bottom. The shell assembly 1 is provided with a first oil channel 105 and a second oil channel 106, and the first oil channel 105 is respectively connected with the clamping oil hole 6, the first clamping hydraulic cavity 41 and the second clamping hydraulic cavity 42. The second oil channel 106 is respectively connected with the loosening clamping oil hole 7, the first loosening clamping hydraulic cavity 51 and the second loosening clamping hydraulic cavity 52.

[0037] The upper surface of the ring-shaped piston 2 and the spring seat 10 and the shell assembly 1 jointly form a first clamping hydraulic cavity 41, and the lower part of the shell assembly 1 and the lower piston assembly 3 jointly form a second clamping hydraulic cavity 42; the outer side surface of the ring-shaped piston 2 and the shell assembly 1 and the upper part of the lower piston assembly 3 jointly form a first unclamping hydraulic cavity 51 and a second unclamping hydraulic cavity 52 respectively. The shell assembly 1 is provided with a clamping oil hole 6 and an unclamping oil hole 7, the clamping oil hole 6 is in communication with the first clamping hydraulic cavity 41 and the second clamping hydraulic cavity 42, and the unclamping oil hole 7 is in communication with the first unclamping hydraulic cavity 51 and the second unclamping hydraulic cavity 52.

[0038] The clamping unit comprises the spring seat 10 arranged in the shell assembly 1 and the ring-shaped split slip 8 sleeved in the spring seat 10, the lower part of the ring-shaped split slip 8 is provided with a split pawl 81, the inner wall of the split pawl 81 is provided with a slip tooth 82, the ring-shaped split slip 8 is arranged in the ring-shaped piston 2, and when the ring-shaped piston 2 and the lower piston assembly 3 move towards each other, the ring-shaped split slip 8 can be pushed to shrink to clamp the outer wall of the casing head; when the ring-shaped piston 2 and the lower piston assembly 3 move reversely, the ring-shaped split slip 8 expands by itself to separate from the outer wall of the casing; at the same time, under the pushing of the elastic member 11, the floating ring 9 and the ring-shaped split slip 8 are always at the uppermost end, and the slip tooth 82 is always in the expanded state. In order to ensure that the floating ring 9 and the ring-shaped split slip 8 are always at the uppermost end, the total pushing force of the elastic member 11 is greater than three times the sum of the mass of the floating ring 9 and the ring-shaped split slip 8.

[0039] The outer wall of the split pawl 81 is provided with a first outer taper surface 83 and a second outer taper surface 84, and the lower part of the inner wall of the ring-shaped piston 2 is provided with a first inner taper surface 21 matched with the first outer taper surface 83. The upper part of the inner wall of the lower piston assembly 3 is provided with a second inner taper surface 304 matched with the second outer taper surface 84.

[0040] The transition flange 102 is sealingly connected with the large four-way joint 101. The spring seat 10 and the floating ring 9 are provided with the elastic member 11, and the elastic member 11 can provide the floating ring 9 with upward elastic force. The elastic member 11 is a compression spring, the spring seat 10 is provided with a spring accommodating cavity 1001, the upper part of the compression spring abuts against the bottom surface of the floating ring 9, and the lower part abuts against the bottom surface of the spring accommodating cavity 1001. The compression spring can be multiple, and the multiple compression springs are uniformly distributed on the spring seat 10 in the circumferential direction. The upper surface of the spring seat 10 and the ring-shaped piston 2 and the shell assembly 1 jointly form the first clamping hydraulic cavity 41, and the outer side surface of the ring-shaped piston 2 and the shell assembly 1 jointly form the first unclamping hydraulic cavity 51.

[0041] The lower piston assembly 3 includes an upper irregularly shaped annular piston 301 and a lower irregularly shaped annular piston 303. An annular sealing rubber sleeve 302 is disposed between the upper and lower irregularly shaped annular pistons 301 and 303. A second inner conical surface 304 is disposed on the upper inner wall of the upper irregularly shaped annular piston 301. A first clamping hydraulic chamber 42 is formed between the lower irregularly shaped annular piston 303 and the lower annular cover plate 104, while a second release hydraulic chamber 52 is formed between the upper irregularly shaped annular piston 301 and the main housing 103.

[0042] The bottom of the spring seat 10 extends downward to form a first guide section 1002. The annular piston 2 is sleeved around the outside of this first guide section 1002, with the outer diameter of this first guide section 1002 matching the inner diameter of the annular piston 2. A third guide section 3011 is provided on the top of the upper irregularly shaped annular piston 301. This third guide section 3011 sleeves inside the main housing 103, with its outer diameter matching the inner diameter of the corresponding position of the main housing 103. The top of the lower annular cover plate 104 extends upward to form a second guide section 1041. The lower irregularly shaped annular piston 303 sleeves around this second guide section 1041, with its outer diameter matching the inner diameter of the lower irregularly shaped annular piston 303.

[0043] A locking valve 12 is further provided on the outside of the housing assembly 1 , the two front oil ports of the locking valve 12 are respectively connected to the oil ports of the external hydraulic station, and the two rear oil ports of the locking valve 12 are respectively connected to the clamping oil hole 6 and the loosening oil hole 7 .

[0044] See also Figure 4 、 Figure 5 During on-site use, the hydraulic annular smooth casing head external clamping quick-connect device provided by the present invention is first connected to the upper hydraulic fully enclosed gate valve BOP 16. The upper end of the hydraulic fully enclosed gate valve BOP 16 is connected to the ignition tube 17. The loosening oil hole 7 and the clamping oil hole 6 are respectively connected to the oil pipeline of the remote hydraulic control console 18 through the locking valve 12. The left and right ends of the large four-way valve 101 are respectively connected to a set of blowout gate valves 14 and a set of well-killing gate valves 15. The blowout gate valve 14 is externally connected to the blowout pipe to facilitate the release of pressure from the blowout well, and the well-killing gate valve 15 is externally connected to the well-killing pipeline to provide a channel for well-killing.

[0045] The function of the hydraulic fully sealed gate blowout preventer 16 is to close the main channel to control the pressure in the well. The function of the ignition tube 17 is to divert the well fluid or flame to ensure that the device of the present invention is not blocked or pushed up when it is installed in place.

[0046] When handling a blowout on site, a dedicated grab robot or lifting equipment can be used to lift the device of the present invention together with related functional components, and the lower end of the quick connection device of the present invention can be aligned with the upper end of the optical sleeve 13, and the weight of the device can be used to drop it to a suitable position.

[0047] After the external clamping quick connecting device of the application is sleeved outside the optical casing 13, the remote hydraulic control console 18 is operated to supply oil to the clamping oil hole 6, the oil enters the first clamping hydraulic cavity 41 and the second clamping hydraulic cavity 42 through the clamping oil hole 6, and respectively pushes the annular piston 2 to move downward and the lower piston assembly 3 to move upward as a whole; the first inner tapered surface 21 on the annular piston 2 and the second inner tapered surface 304 of the upper special-shaped annular piston 301 simultaneously push the multiple petal bodies of the annular split slip 8 and make them shrink inward, so that the slip teeth 82 are clamped on the outer wall of the optical casing 13; in the process of moving the lower piston assembly 3 upward as a whole, the lower special-shaped annular piston 303 moves upward and extrudes the annular sealing rubber sleeve 302, so that the annular sealing rubber sleeve 302 expands inward, thereby sealing the annulus between the lower piston assembly 3 and the optical casing 13, and hydraulic clamping and sealing are completed.

[0048] In the process of closing the hydraulic full-seal ram preventer 16, the upward thrust of the whole set of devices caused by the well pressure gradually increases with the gradual narrowing of the main channel, which may cause the whole set of devices to move upward. In order to avoid that the slip teeth 82 also move upward with the whole set of devices, the annular piston 2 in the application is made into a floating type, that is, even if the device body moves upward, the slip teeth 82 will tightly engage on the casing outer wall, and the engagement force of the slip teeth 82 increases with the increase of the upward thrust.

[0049] Then the hydraulic full-seal ram preventer 16 is closed to seal the wellbore. At this time, the wellbore is in a pressurized and sealed state, and the blowout is controlled. The blowout is discharged by using the blowout ram valve 14, or the well is pressed by using the well killing ram valve 15.

[0050] After the well killing is completed, the remote hydraulic control console 18 is operated to supply oil to the slip releasing oil hole 7, the oil enters the first slip releasing hydraulic cavity 51 and the second slip releasing hydraulic cavity 52 through the slip releasing oil hole 7, and the oil in the first clamping hydraulic cavity 41 and the second clamping hydraulic cavity 42 is discharged through the clamping oil hole 6, the annular piston 2 moves upward, the lower piston assembly 3 moves downward, the multiple petal bodies of the annular split slip 8 recover to the original state radially outward under their own elasticity, and the slip teeth 82 are separated from the outer wall of the optical casing 13; at the same time, the annular sealing rubber sleeve 302 in the lower piston assembly 3 also recovers to the original state by its own elasticity, and the sealing between the lower piston assembly 3 and the outer wall of the optical casing 13 is removed. Finally, the whole set of devices is lifted away by using lifting equipment, and a new wellhead can be repositioned.

Claims

1. A hydraulic annular light casing head external clamping quick connection device, characterized by: It includes a hydraulic drive unit and a clamping unit; The hydraulic drive unit comprises a housing assembly (1) and an annular piston (2) and a lower piston assembly (3) arranged therein; the annular piston (2) and the lower piston assembly (3) can move up and down inside the housing assembly (1) to drive the clamping unit to clamp or loosen the head of the connected light sleeve (13); The clamping unit comprises a spring seat (10) arranged inside the housing assembly (1) and an annular petal slip (8) sleeved inside the spring seat (10); a petal claw (81) is provided at the lower portion of the annular petal slip (8), and a slip tooth (82) is provided on the inner wall of the petal claw (81); and a floating ring (9) is provided at the upper portion of the annular petal slip (8); The housing assembly (1), the upper surface of the annular piston (2) and the lower portion of the spring seat (10) together form a first clamping hydraulic chamber (41), and a second clamping hydraulic chamber (42) is formed between the housing assembly (1) and the lower portion of the lower piston assembly (3); A first loosening hydraulic chamber (51) and a second loosening hydraulic chamber (52) are respectively formed between the housing assembly (1), the lower portion of the annular piston (2), and the upper portion of the lower piston assembly (3); The housing assembly (1) is provided with a clamping oil hole (6) and a loosening oil hole (7); the clamping oil hole (6) is in communication with both the first clamping hydraulic chamber (41) and the second clamping hydraulic chamber (42); the loosening oil hole (7) is in communication with both the first loosening hydraulic chamber (51) and the second loosening hydraulic chamber (52); The annular petal slip (8) is arranged in the annular piston (2), and the annular piston (2) and the lower piston assembly (3) can drive the annular petal slip (8) to contract or expand; the housing assembly (1) comprises a wellhead large four-way (101), a transition flange (102), a main housing (103) and a lower annular cover plate (104) connected in series in the axial direction from top to bottom; A first outer conical surface (83) and a second outer conical surface (84) are provided on the outer wall of the petal-splitting claw (81); The lower portion of the inner wall of the annular piston (2) is provided with a first inner conical surface (21) adapted to the first outer conical surface (83); the upper portion of the inner wall of the lower piston assembly (3) is provided with a second inner conical surface (304) adapted to the second outer conical surface (84).

2. The hydraulic annular smooth casing head external clamping quick connection device according to claim 1, characterized in that: The spring seat (10) is sealedly connected to the inner hole wall of the transition flange (102); an elastic member (11) is provided between the spring seat (10) and the floating ring (9), and the elastic member (11) can provide an upward elastic force for the floating ring (9) to push the annular petal cava (8) upward, and the total thrust of the elastic member (11) is greater than three times the sum of the masses of the floating ring (9) and the annular petal cava (8).

3. The hydraulic annular smooth casing head external clamping quick connection device according to claim 2, characterized in that: The elastic member (11) is a compression spring, and a spring accommodating cavity (1001) is provided on the spring seat (10). The upper portion of the compression spring abuts against the bottom surface of the floating ring (9), and the lower portion abuts against the bottom surface of the spring accommodating cavity (1001).

4. The hydraulic annular smooth casing head external clamping quick connection device according to any one of claims 1 to 3, characterized in that: The lower piston assembly (3) comprises an upper special-shaped annular piston (301) and a lower special-shaped annular piston (303), an annular sealing rubber sleeve (302) is provided between the upper special-shaped annular piston (301) and the lower special-shaped annular piston (303), and the second inner conical surface (304) is provided on the upper inner wall of the upper special-shaped annular piston (301).

5. The hydraulic annular smooth casing head external clamping quick connection device according to claim 4, characterized in that: It also includes a locking valve (12) arranged on the outside of the housing assembly (1), wherein the two front oil ports of the locking valve (12) are respectively connected to the inlet and outlet of the external hydraulic station; and the two rear oil ports of the locking valve (12) are respectively connected to the clamping oil hole (6) and the loosening oil hole (7).

6. The hydraulic annular smooth casing head external clamping quick connection device according to claim 5, characterized in that: A first oil passage (105) and a second oil passage (106) are provided in the housing assembly (1). The first oil passage (105) is connected to the clamping oil hole (6), the first clamping hydraulic chamber (41), and the second clamping hydraulic chamber (42), respectively; and the second oil passage (106) is connected to the loosening oil hole (7), the first loosening hydraulic chamber (51), and the second loosening hydraulic chamber (52), respectively.

7. The hydraulic annular smooth casing head external clamping quick connection device according to claim 6, characterized in that: A first guide section (1002) is provided at the lower portion of the spring seat (10), the annular piston (2) is sleeved on the outside of the first guide section (1002), and the outer diameter of the first guide section (1002) is adapted to the inner hole diameter of the annular piston (2); A third guide section (3011) is provided on the upper portion of the upper special-shaped annular piston (301). The third guide section (3011) is sleeved inside the main housing (103), and its outer diameter is adapted to the inner diameter of a corresponding position of the main housing (103).

8. The hydraulic annular smooth casing head external clamping quick connection device according to claim 7, characterized in that: A second guide section (1041) is provided on the upper portion of the lower annular cover plate (104), and the lower special-shaped annular piston (303) is sleeved on the outer side of the second guide section (1041). The outer diameter of the second guide section (1041) is adapted to the inner diameter of the lower special-shaped annular piston (303).

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