Coiled tubing four-ram blowout preventer suspension device and using method

Abstract

The invention relates to the technical field of oil exploitation, in particular to a coiled tubing four-ram blowout preventer suspension device and a using method. According to the technical scheme, a ring seal actuator is installed in an inner cavity of a ring seal actuator bearing cylinder, a suspension actuator bearing cylinder is installed on the lower side of the ring seal actuator bearing cylinder, and a suspension actuator is installed in an inner cavity of the suspension actuator bearing cylinder; the full sealing and shearing device, the ring sealing actuator bearing cylinder and the suspension actuator bearing cylinder are connected and fixed through a plurality of connecting bolts; the coiled tubing hanging device has the beneficial effects that the long-strip-barrel-shaped rubber expansion body is adopted and makes contact with the coiled tubing through the hanging connecting wall, the contact area of the coiled tubing hanging device and the outer wall of the coiled tubing is increased, and the hanging function of the coiled tubing is effectively achieved; besides, a ring sealing rubber expansion body of the ring sealing actuator is adopted, and the designed sealing contact surface and a self-sealing structure are utilized, so that the ring sealing blowout prevention function of the continuous oil pipe can be effectively realized, and the service life of the continuous oil pipe is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil exploitation, in particular to a continuous tubing four-gate blowout preventer suspension device and a use method thereof. BACKGROUND

[0002] Continuous tubing is a flexible and continuous pipe wound on a large reel, which is a component of well servicing operations in the oil and gas industry, unlike traditional joint pipes, continuous tubing does not need to be connected multiple times and can be seamlessly inserted into a well. This technology has completely changed various aspects of well maintenance, including stimulation treatment, cleaning, and even drilling in some cases. By using continuous tubing, operators can more effectively access deep or deviated wells while minimizing downtime, which can save a large amount of time and cost compared to traditional methods.

[0003] In the construction process of continuous tubing, the safety protection device that must be installed is a four-gate blowout preventer, which is used to prevent blowout during operation. The four-gate blowout preventer is a device that uses hydraulic drive, has fast response speed, and high safety factor. Among them, the suspension function of the existing four-gate blowout preventer is realized by using a suspension slip, which is driven by a hydraulic device to press the continuous tubing, thereby realizing the suspension function of the continuous tubing. However, it has the problem that: since the existing suspension slip is a metal structure, it needs to press the wall of the continuous tubing to fix the continuous tubing when suspended, and after continuous pressing, the local wall of the continuous tubing may be deformed due to stress, thereby affecting the service life of the continuous tubing, and the cost of continuous tubing is relatively high, especially the cost of continuous tubing for deep wells is higher, therefore, an improved four-gate blowout preventer suspension device is urgently needed to prolong the service life of the continuous tubing. SUMMARY

[0004] The purpose of the present application is to solve the above-mentioned defects in the prior art, and to provide a continuous tubing four-gate blowout preventer suspension device and a use method thereof. The suspension actuator of the present application is a long cylindrical rubber expansion body, which contacts the continuous tubing through the suspension connecting wall, not only increasing the contact area with the outer wall of the continuous tubing, but also effectively realizing the suspension function of the continuous tubing. In addition, the present application also uses the ring seal rubber expansion body of the ring seal actuator, which can effectively realize the ring seal blowout prevention function of the continuous tubing by using the designed sealing contact surface and self-sealing structure.

[0005] The invention provides a coiled tubing four-gate blowout preventer suspension device, which is characterized by comprising connecting bolts, a ring seal actuator receiving cylinder, a suspension actuator receiving cylinder, a ring seal actuator, and a suspension actuator.

[0006] Preferably, the suspension actuator receiving cylinder comprises a wellhead connecting flange, a suspension actuator receiving cylinder sleeve body, a bottom plug, wellhead bolt connecting holes, blowout preventer assembly connecting holes, a blowout preventer sealing groove, and a steel ring sealing groove.

[0007] Preferably, the bottom plug has a circular through hole in the center for facilitating the passage of the coiled tubing, is threadedly connected to the lower end of the suspension actuator receiving cylinder sleeve body, has an inner diameter smaller than that of the suspension actuator receiving cylinder sleeve body, and has a support step at the top end for supporting the suspension actuator.

[0008] Preferably, the ring seal actuator receiving cylinder comprises a ring seal actuator cylinder body, assembly holes, a ring seal actuator receiving cavity, a coiled tubing passing cavity, a planar sealing groove, a ring seal liquid inlet execution hole, a suspension liquid inlet execution hole, and a suspension actuator upper receiving cavity.

[0009] Preferably, the ring seal actuator comprises a ring seal rubber expansion body, a ring seal power cavity, and a ring seal liquid inlet hole, the center of the ring seal rubber expansion body is provided with a circular through hole for facilitating the continuous oil pipe to pass through; the inner cavity of the ring seal rubber expansion body is provided with a ring seal power cavity, and the outer wall of the ring seal rubber expansion body is provided with a ring seal liquid inlet hole, which is connected to the hydraulic device through the installation of a liquid inlet nozzle and a hydraulic pipeline.

[0010] Preferably, the center of the ring seal rubber expansion body is provided with a sealing contact surface for contacting and cooperating with the outer wall of the continuous oil pipe, and self-sealing structures are respectively arranged at both ends of the sealing contact surface; when the hydraulic oil is injected, the outer wall of the ring seal rubber expansion body is supported by the ring seal actuator cylinder body, the ring seal rubber expansion body is deformed and expanded towards the center, so that the sealing contact surface is in close contact with the outer wall of the continuous oil pipe.

[0011] Preferably, the rubber expansion body is in a hollow long cylindrical structure, the suspension connecting wall of the inner wall is in a reverse tooth structure, and under the action of hydraulic pressure, the rubber expansion body of the suspension actuator is in contact and locked on the outer wall of the continuous oil pipe, so that the continuous oil pipe is in a static suspension state.

[0012] Preferably, the sealing contact surface of the inner wall of the ring seal rubber expansion body is in a structure that the central inner diameter is gradually larger than the inner diameters at both ends, and the self-sealing structures at both ends of the ring seal rubber expansion body are in a triangular notch structure; under the action of hydraulic pressure, the ring seal rubber expansion body of the ring seal actuator is in contact and locked on the outer wall of the continuous oil pipe, thereby playing a role of ring sealing.

[0013] The use method of the continuous oil pipe four-gate blowout preventer suspension device mentioned in the application comprises the following processes: I. Assembling the continuous oil pipe four-gate blowout preventer suspension device, installing a ring seal actuator receiving cylinder below the full sealing and shearing device of the continuous oil pipe four-gate blowout preventer, installing a suspension actuator receiving cylinder below the ring seal actuator receiving cylinder, installing a ring seal actuator in the ring seal actuator receiving cylinder, installing a suspension actuator in the suspension actuator receiving cylinder, and connecting the liquid inlet nozzle of the ring seal liquid inlet hole provided on the ring seal rubber expansion body of the ring seal actuator to the hydraulic device through a hydraulic pipeline by passing through the ring seal liquid inlet execution hole, and connecting the liquid inlet nozzle installed at the liquid inlet hole of the rubber expansion body of the suspension actuator to the hydraulic device through a hydraulic pipeline by passing through the suspension liquid inlet execution hole; then, the connecting bolts are passed from top to bottom through the full sealing and shearing device, the ring seal actuator receiving cylinder and the suspension actuator receiving cylinder; then, the suspension actuator receiving cylinder is installed at the lower part of the wellhead by passing through the wellhead connecting flange again; 2. When it is necessary to suspend the coiled tubing, hydraulic oil is injected into the rubber expansion body of the suspension actuator through the hydraulic device. The hydraulic oil enters the power chamber inside the rubber expansion body. Since the outer wall of the rubber expansion body is attached to the inner wall of the cylinder liner body of the suspension actuator, the hydraulic oil pushes the inner wall of the rubber expansion body to be squeezed and deformed inward, thereby pushing the suspension connecting wall to lock onto the outer wall of the coiled tubing, so that the coiled tubing is in a static suspension state. 3. When ring sealing of the coiled tubing is required, hydraulic oil is injected into the ring sealing rubber expansion body of the ring sealing actuator via a hydraulic device. The hydraulic oil enters the ring sealing power chamber inside the ring sealing rubber expansion body. Since the outer wall of the ring sealing rubber expansion body is attached to the inner wall of the ring sealing actuator cylinder, the hydraulic oil pushes the inner wall of the ring sealing rubber expansion body inward to deform it, thereby pushing the sealing contact surface to press tightly against the outer wall of the coiled tubing. Because the sealing contact surface of the inner wall of the ring sealing rubber expansion body has a structure in which the inner diameter at the center gradually increases to the inner diameter at both ends, and the self-sealing structure at both ends of the ring sealing rubber expansion body is a triangular notch structure; under the action of hydraulic pressure, the ring sealing rubber expansion body contacts and locks tightly against the outer wall of the coiled tubing, playing a ring sealing and anti-blowout role.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: I. This invention replaces the original metal slips with rubber expansion bodies, changing the original rigid connection and suspension between the slips and the outer wall of the coiled tubing to a flexible connection and suspension. The rubber expansion body not only provides excellent protection for the coiled tubing, extending its service life and thus improving economic efficiency, but also the long cylindrical rubber expansion body can effectively hold the coiled tubing, enabling it to achieve a suspension function and avoiding the problem of the coiled tubing wall being squeezed and deformed, leading to premature scrapping of the coiled tubing. Second, this invention also adds a ring seal actuator receiving cylinder and a ring seal actuator. Utilizing the sealing contact surface and self-sealing structure designed on the ring seal actuator, effective sealing and anti-spraying functions can be achieved. The ring seal liquid inlet and suspension liquid inlet designed on the ring seal actuator receiving cylinder deliver hydraulic oil through hydraulic pipelines to the ring seal rubber expansion body and the rubber expansion body inside the suspension actuator, so that the ring seal rubber expansion body and the rubber expansion body can expand and deform towards the center, thereby achieving the suspension and ring sealing functions. Third, by lowering the suspension actuator and the suspension actuator receiving cylinder into the lower part of the wellhead, this invention reduces the space occupied by the above-ground part of the four-gate blowout preventer, makes full use of the space resources of the oil well, greatly improves the safety factor of the entire four-gate blowout preventer, expands the application range of coiled tubing, and reduces the original limitations of the four-gate blowout preventer on the application range of coiled tubing. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the suspension actuator receiving cylinder; Figure 3 This is a schematic diagram of the suspension actuator; Figure 4 yes Figure 3 A schematic diagram of the AA structure in the diagram; Figure 5 This is a schematic diagram of the structure of the ring seal actuator receiving cylinder; Figure 6 This is a schematic diagram of the ring seal actuator; Figure 7 yes Figure 6 A schematic diagram of the BB structure in the image; Figure 8 This is a schematic diagram of the full-sealing and shearing device; In the diagram: 1. Full sealing and shearing device; 2. Ring sealing actuator receiving cylinder; 3. Connecting bolt; 4. Suspension actuator receiving cylinder; 5. Ring sealing actuator; 6. Suspension actuator; 7. Coiled tubing; 8. Blowout preventer body. 1.1 Full sealing device; 1.2 Shearing device; 1.3 Coupling device; 1.4 Ring sealing actuator cylinder body; 2.1 Assembly hole; 2.2 Ring sealing actuator receiving cavity; 2.3 Coiled tubing passage cavity; 2.4 Flat sealing groove; 2.5 Ring sealing fluid inlet actuation hole; 2.6 Suspension fluid inlet actuation hole; 2.7 Suspension actuator upper receiving cavity. 2.8 Wellhead connecting flange 4.1 Suspension actuator receiving cylinder body 4.2 Bottom plug 4.3 Wellhead bolt connection hole 4.4 Blowout preventer assembly connection hole 4.5 Blowout preventer sealing groove 4.6 Steel ring sealing groove 4.7 Assembly process hole 4.8 Weld joint 4.9 Ring seal rubber expansion body 5.1 Ring seal power chamber 5.2 Ring seal fluid inlet 5.3 Sealing contact surface 5.4 Self-sealing structure 5.5 Rubber expansion body 6.1 Power chamber 6.2 Suspension connecting wall 6.3 Fluid inlet 6.4 Detailed Implementation

[0016] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0017] Example 1, referring to Figures 1-7The present invention discloses a four-gate blowout preventer suspension device for continuous tubing, comprising connecting bolts 3, a ring seal actuator receiving cylinder 2, a suspension actuator receiving cylinder 4, a ring seal actuator 5, and a suspension actuator 6. The ring seal actuator 5 is installed inside the ring seal actuator receiving cylinder 2, the suspension actuator receiving cylinder 4 is installed below the ring seal actuator receiving cylinder 2, and the suspension actuator 6 is installed inside the suspension actuator receiving cylinder 4. The ring seal actuator and the shearing device 1 are connected by multiple connecting bolts 3. Cylinder 2 and the suspension actuator receiving cylinder 4 are connected and fixed; the suspension actuator 6 includes a rubber expansion body 6.1, a power chamber 6.2, a suspension connecting wall 6.3, and a liquid inlet 6.4. The power chamber 6.2 is provided inside the rubber expansion body 6.1, and a liquid inlet 6.4 is provided on the outer wall of the rubber expansion body 6.1. A suspension connecting wall 6.3 for contacting the outer wall of the continuous oil pipe 7 is provided at the center of the rubber expansion body 6.1. The hydraulic device is connected to the liquid inlet nozzle installed at the liquid inlet 6.4 through hydraulic pipelines.

[0018] Reference Figure 2 The suspended actuator receiving cylinder 4 mentioned in this invention includes a wellhead connecting flange 4.1, a suspended actuator receiving cylinder body 4.2, a bottom plug 4.3, wellhead bolt connection holes 4.4, blowout preventer assembly connection holes 4.5, a blowout preventer sealing groove 4.6, and a steel ring sealing groove 4.7. The top of the suspended actuator receiving cylinder body 4.2 is fixedly connected to the wellhead connecting flange 4.1 through a welded joint 4.9. The bottom of the suspended actuator receiving cylinder body 4.2 is fitted with a bottom plug 4.3. The suspended actuator 6 is installed in the inner cavity of the suspended actuator receiving cylinder body 4.2. A blowout preventer sealing groove 4.6 is provided on the upper side of the wellhead connecting flange 4.1, and a steel ring sealing groove 4.7 is provided on the lower side. Multiple wellhead bolt connection holes 4.4 are provided on the outer side. Multiple blowout preventer assembly connection holes 4.5 are installed on the suspended actuator receiving cylinder body 4.2 for installing connecting bolts 3.

[0019] The bottom plug 4.3 has a circular through hole in its center to facilitate the passage of the continuous oil pipe 7. The bottom plug 4.3 is threaded to the lower end of the cylinder liner body 4.2 of the suspension actuator. The inner diameter of the bottom plug 4.3 is smaller than the inner diameter of the cylinder liner body 4.2 of the suspension actuator. The top of the bottom plug 4.3 has a support step to support the suspension actuator 6. An assembly process hole 4.8 is provided at the bottom end of the bottom plug 4.3.

[0020] Reference Figure 5The ring seal actuator receiving cylinder 2 mentioned in this invention includes a ring seal actuator cylinder body 2.1, an assembly hole 2.2, a ring seal actuator receiving cavity 2.3, a continuous oil pipe passage cavity 2.4, a planar sealing groove 2.5, a ring seal liquid inlet actuation hole 2.6, a suspension liquid inlet actuation hole 2.7, and a suspension actuator upper receiving cavity 2.8. The ring seal actuator cylinder body 2.1 has the ring seal actuator receiving cavity 2.3, the continuous oil pipe passage cavity 2.4, and the suspension actuator upper receiving cavity 2.8 at its center, and the continuous oil pipe passage cavity 2.4 is located in the ring seal actuator receiving cavity. Between cavity 2.3 and upper receiving cavity 2.8 of the suspension actuator, the outer diameter of the continuous oil pipe passing through cavity 2.4 is smaller than the outer diameter of the receiving cavity 2.3 of the ring seal actuator and the receiving cavity 2.8 of the suspension actuator; multiple assembly holes 2.2 are provided axially on the outer wall of the ring seal actuator cylinder 2.1 for installing connecting bolts 3; a ring seal liquid inlet actuation hole 2.6 is provided at the upper part of the outer wall of the ring seal actuator cylinder 2.1, and a suspension liquid inlet actuation hole 2.7 is provided at the lower part; a planar sealing groove 2.5 is provided at the top and bottom of the ring seal actuator cylinder 2.1 respectively.

[0021] Reference Figures 6-7 The ring-sealing actuator 5 mentioned in this invention includes a ring-sealing rubber expansion body 5.1, a ring-sealing power chamber 5.2, and a ring-sealing liquid inlet 5.3. The ring-sealing rubber expansion body 5.1 has a circular through hole in its center to facilitate the passage of the continuous oil pipe 7. The inner cavity of the ring-sealing rubber expansion body 5.1 is provided with a ring-sealing power chamber 5.2, and the outer wall of the ring-sealing rubber expansion body 5.1 is provided with a ring-sealing liquid inlet 5.3, which is connected to the hydraulic device by installing a liquid inlet nozzle and hydraulic pipeline.

[0022] The aforementioned ring-sealing rubber expansion body 5.1 has a sealing contact surface 5.4 at its center for contacting and engaging with the outer wall of the continuous oil pipe 7, and self-sealing structures 5.5 are provided at both ends of the sealing contact surface 5.4. When hydraulic oil is injected, the outer wall of the ring-sealing rubber expansion body 5.1 expands and deforms towards the center under the support of the ring-sealing actuator cylinder 2.1, so that the sealing contact surface 5.4 is in close contact with the outer wall of the continuous oil pipe 7.

[0023] Among them, the rubber expansion body 6.1 is a hollow long cylindrical structure, and the inner wall of the suspension connection wall 6.3 is a reverse toothed structure. Under hydraulic action, the rubber expansion body 6.1 of the suspension actuator 6 contacts and locks against the outer wall of the continuous oil pipe 7, so that the continuous oil pipe 7 is in a static suspension state.

[0024] Furthermore, the sealing contact surface 5.4 of the inner wall of the aforementioned ring-sealing rubber expansion body 5.1 has a structure in which the inner diameter of the center gradually increases to the inner diameter of both ends, and the self-sealing structure 5.5 at both ends of the ring-sealing rubber expansion body 5.1 is a triangular notch structure; under hydraulic action, the ring-sealing rubber expansion body 5.1 of the ring-sealing actuator 5 contacts and locks against the outer wall of the continuous oil pipe 7, thus playing the role of ring sealing.

[0025] Reference Figure 8 The full sealing and shearing device 1 mentioned in this invention is prior art, including a blowout preventer body 1.1, a full sealing device 1.2, a shearing device 1.3, and a locking device 1.4. The existing full sealing device 1.2 and shearing device 1.3 are installed on the upper part of the blowout preventer body 1.1, which can realize the full sealing function and the shearing function respectively. The locking device 1.4 is installed on the top of the blowout preventer body 1.1.

[0026] The method of using the coiled tubing four-gate blowout preventer suspension device mentioned in this invention includes the following steps: 1. Assemble the suspension device for the four-gate blowout preventer of coiled tubing. Install the annular seal actuator receiving cylinder 2 below the full sealing and shearing device 1 of the four-gate blowout preventer of coiled tubing. Install the suspension actuator receiving cylinder 4 below the annular seal actuator receiving cylinder 2. Install the annular seal actuator 5 inside the annular seal actuator receiving cylinder 2. Install the suspension actuator 6 inside the suspension actuator receiving cylinder 4. Then, pass the fluid through the annular seal inlet hole 5.3 on the annular seal rubber expansion body 5.1 of the annular seal actuator 5. The hydraulic line passes through the annular seal inlet actuator hole 2.6 and is connected to the hydraulic device. The inlet nozzle installed at the inlet hole 6.4 of the rubber expansion body 6.1 of the suspension actuator 6 is connected to the hydraulic device through the hydraulic line passing through the suspension inlet actuator hole 2.7. Then, the connecting bolt 3 is passed from top to bottom through the full sealing and shearing device 1, the annular seal actuator receiving cylinder 2, and the suspension actuator receiving cylinder 4. Then, the suspension actuator receiving cylinder 4 is installed at the lower part of the wellhead through the wellhead connecting flange 4.1. 2. When it is necessary to suspend the continuous oil pipe 7, hydraulic oil is injected into the rubber expansion body 6.1 of the suspension actuator 6 through the hydraulic device. The hydraulic oil enters the power chamber 6.2 inside the rubber expansion body 6.1. Since the outer wall of the rubber expansion body 6.1 is attached to the inner wall of the cylinder liner body 4.2 of the suspension actuator, the hydraulic oil pushes the inner wall of the rubber expansion body 6.1 to be squeezed and deformed inward, thereby pushing the suspension connecting wall 6.3 to lock onto the outer wall of the continuous oil pipe 7, so that the continuous oil pipe 7 is in a static suspension state. 3. When it is necessary to perform ring sealing on the coiled tubing 7, hydraulic oil is injected into the ring sealing rubber expansion body 5.1 of the ring sealing actuator 5 through a hydraulic device. The hydraulic oil enters the ring sealing power chamber 5.2 inside the ring sealing rubber expansion body 5.1. Since the outer wall of the ring sealing rubber expansion body 5.1 is attached to the inner wall of the ring sealing actuator cylinder 2.1, the hydraulic oil pushes the inner wall of the ring sealing rubber expansion body 5.1 to be squeezed and deformed inward, thereby pushing the sealing contact surface 5.4 to be pressed tightly against the outer wall of the coiled tubing 7. Since the sealing contact surface 5.4 of the inner wall of the ring sealing rubber expansion body 5.1 has a structure in which the inner diameter of the center gradually increases to the inner diameter of both ends, and the self-sealing structure 5.5 at both ends of the ring sealing rubber expansion body 5.1 is a triangular notch structure; under the action of hydraulic pressure, the ring sealing rubber expansion body 5.1 is locked in contact with the outer wall of the coiled tubing 7, which plays a role in ring sealing and preventing blowout.

[0027] Example 2: The coiled tubing four-gate blowout preventer suspension device mentioned in this invention includes connecting bolts 3, and also includes a ring seal actuator receiving cylinder 2, a suspension actuator receiving cylinder 4, a ring seal actuator 5, and a suspension actuator 6. The ring seal actuator 5 is installed in the inner cavity of the ring seal actuator receiving cylinder 2, the suspension actuator receiving cylinder 4 is installed on the lower side of the ring seal actuator receiving cylinder 2, and the suspension actuator 6 is installed in the inner cavity of the suspension actuator receiving cylinder 4. The full seal and shearing device 1 and the ring seal actuator are connected by multiple connecting bolts 3. The receiving cylinder 2 and the suspension actuator receiving cylinder 4 are connected and fixed; the suspension actuator 6 includes a rubber expansion body 6.1, a power chamber 6.2, a suspension connecting wall 6.3, and a liquid inlet 6.4. The power chamber 6.2 is provided inside the rubber expansion body 6.1, and a liquid inlet 6.4 is provided on the outer wall of the rubber expansion body 6.1. A suspension connecting wall 6.3 for contacting the outer wall of the continuous oil pipe 7 is provided at the center of the rubber expansion body 6.1. The hydraulic device is connected to the liquid inlet nozzle installed at the liquid inlet 6.4 through hydraulic pipelines.

[0028] The difference from Example 1 is: The suspension connection wall 6.3 on the inner wall of the rubber expansion body 6.1 mentioned in this embodiment has an anti-slip textured structure. Under hydraulic action, the suspension connection wall 6.3 contacts and locks onto the outer wall of the continuous oil pipe 7, so that the continuous oil pipe 7 is in a static suspension state.

[0029] The above description is merely a partial preferred embodiment of the present invention. Any person skilled in the art can modify the above-described technical solutions or modify them into equivalent technical solutions. Therefore, any simple modifications or equivalent transformations made based on the technical solutions of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A coiled tubing four-gate blowout preventer suspension device, comprising connecting bolts (3), characterized in that: It also includes a ring seal actuator receiving cylinder (2), a suspension actuator receiving cylinder (4), a ring seal actuator (5), and a suspension actuator (6). The ring seal actuator (5) is installed in the inner cavity of the ring seal actuator receiving cylinder (2), and the suspension actuator receiving cylinder (4) is installed on the lower side of the ring seal actuator receiving cylinder (2). The suspension actuator (6) is installed in the inner cavity of the suspension actuator receiving cylinder (4). The full sealing and shearing device (1), the ring seal actuator receiving cylinder (2), and the suspension actuator receiving cylinder (4) are connected and fixed by multiple connecting bolts (3). The suspension actuator (6) includes a rubber expansion body (6.1), a power chamber (6.2), a suspension connecting wall (6.3), and a liquid inlet (6.4). The power chamber (6.2) is provided inside the rubber expansion body (6.1), and a liquid inlet (6.4) is provided on the outer wall of the rubber expansion body (6.1). A suspension connecting wall (6.3) for contacting the outer wall of the continuous oil pipe (7) is provided at the center of the rubber expansion body (6.1). The hydraulic device is connected to the liquid inlet nozzle installed at the liquid inlet (6.4) through hydraulic pipelines.

2. The coiled tubing four-gate blowout preventer suspension device according to claim 1, characterized in that: The suspended actuator receiving cylinder (4) includes a wellhead connecting flange (4.1), a suspended actuator receiving cylinder body (4.2), a bottom plug (4.3), a wellhead bolt connection hole (4.4), a blowout preventer assembly connection hole (4.5), a blowout preventer sealing groove (4.6), and a steel ring sealing groove (4.7). The wellhead connecting flange (4.1) is installed on the top of the suspended actuator receiving cylinder body (4.2), the bottom plug (4.3) is installed on the bottom of the suspended actuator receiving cylinder body (4.2), and the suspended actuator (6) is installed in the inner cavity of the suspended actuator receiving cylinder body (4.2). A blowout preventer sealing groove (4.6) is provided on the upper side of the wellhead connecting flange (4.1), a steel ring sealing groove (4.7) is provided on the lower side, and multiple wellhead bolt connection holes (4.4) are provided on the outer side. Multiple blowout preventer assembly connection holes (4.5) are installed on the suspended actuator receiving cylinder body (4.2) for installing connecting bolts (3).

3. The coiled tubing four-gate blowout preventer suspension device according to claim 2, characterized in that: The bottom plug (4.3) has a circular through hole in the center, which facilitates the passage of the continuous oil pipe (7); the bottom plug (4.3) is connected to the lower end of the cylinder liner body (4.2) of the suspension actuator by a thread, the inner diameter of the bottom plug (4.3) is smaller than the inner diameter of the cylinder liner body (4.2) of the suspension actuator, and the top of the bottom plug (4.3) is provided with a support step for supporting the suspension actuator (6); an assembly process hole (4.8) is provided at the bottom end of the bottom plug (4.3).

4. The coiled tubing four-gate blowout preventer suspension device according to claim 3, characterized in that: The ring seal actuator receiving cylinder (2) includes a ring seal actuator cylinder body (2.1), an assembly hole (2.2), a ring seal actuator receiving cavity (2.3), a continuous oil pipe passage cavity (2.4), a planar sealing groove (2.5), a ring seal liquid inlet actuator hole (2.6), a suspension liquid inlet actuator hole (2.7), and a suspension actuator upper receiving cavity (2.8). The ring seal actuator cylinder body (2.1) is provided with the ring seal actuator receiving cavity (2.3), the continuous oil pipe passage cavity (2.4), and the suspension actuator upper receiving cavity (2.8) at its center, and the continuous oil pipe passage cavity (2.4) is located in the ring seal actuator receiving cavity. Between (2.3) and the upper receiving cavity (2.8) of the suspension actuator, the outer diameter of the continuous oil pipe through cavity (2.4) is smaller than the outer diameter of the receiving cavity (2.3) of the ring seal actuator and the upper receiving cavity (2.8) of the suspension actuator; multiple assembly holes (2.2) are provided axially on the outer wall of the ring seal actuator cylinder (2.1) for installing connecting bolts (3); a ring seal liquid inlet execution hole (2.6) is provided on the upper part of the outer wall of the ring seal actuator cylinder (2.1), and a suspension liquid inlet execution hole (2.7) is provided on the lower part; a planar sealing groove (2.5) is provided at the top and bottom of the ring seal actuator cylinder (2.1).

5. The coiled tubing four-gate blowout preventer suspension device according to claim 4, characterized in that: The ring seal actuator (5) includes a ring seal rubber expansion body (5.1), a ring seal power chamber (5.2), and a ring seal liquid inlet (5.3). The ring seal rubber expansion body (5.1) has a circular through hole in the center, which facilitates the passage of the continuous oil pipe (7). The inner cavity of the ring seal rubber expansion body (5.1) is provided with a ring seal power chamber (5.2), and the outer wall of the ring seal rubber expansion body (5.1) is provided with a ring seal liquid inlet (5.3), which is connected to the hydraulic device by installing a liquid inlet nozzle and hydraulic pipeline.

6. The coiled tubing four-gate blowout preventer suspension device according to claim 5, characterized in that: The ring-sealed rubber expansion body (5.1) has a sealing contact surface (5.4) at its center for contacting and engaging with the outer wall of the continuous oil pipe (7), and self-sealing structures (5.5) are provided at both ends of the sealing contact surface (5.4); when hydraulic oil is injected, the outer wall of the ring-sealed rubber expansion body (5.1) expands and deforms towards the center under the support of the ring-sealed actuator cylinder (2.1), so that the sealing contact surface (5.4) is in close contact with the outer wall of the continuous oil pipe (7).

7. The coiled tubing four-gate blowout preventer suspension device according to claim 6, characterized in that: The rubber expansion body (6.1) is a hollow long cylindrical structure, and the inner wall of the suspension connection wall (6.3) is a toothed structure. Under hydraulic action, the rubber expansion body (6.1) of the suspension actuator (6) contacts and locks against the outer wall of the continuous oil pipe (7), so that the continuous oil pipe (7) is in a static suspension state.

8. The coiled tubing four-gate blowout preventer suspension device according to claim 7, characterized in that: The sealing contact surface (5.4) of the inner wall of the ring-sealing rubber expansion body (5.1) is a structure in which the inner diameter of the center gradually increases to the inner diameter of both ends, and the self-sealing structure (5.5) at both ends of the ring-sealing rubber expansion body (5.1) is a triangular notch structure; under hydraulic action, the ring-sealing rubber expansion body (5.1) of the ring-sealing actuator (5) is locked to the outer wall of the continuous oil pipe (7) to play the role of ring sealing.

9. The method of using the four-gate blowout preventer suspension device for coiled tubing according to claim 7, characterized in that: The process includes the following:

1. Assemble the suspension device for the four-gate blowout preventer of coiled tubing. Install the ring seal actuator receiving cylinder (2) below the full sealing and shearing device (1) of the four-gate blowout preventer of coiled tubing. Install the suspension actuator receiving cylinder (4) below the ring seal actuator receiving cylinder (2). Install the ring seal actuator (5) inside the ring seal actuator receiving cylinder (2). Install the suspension actuator (6) inside the suspension actuator receiving cylinder (4). Then, pass the liquid through the inlet of the ring seal inlet hole (5.3) provided on the ring seal rubber expansion body (5.1) of the ring seal actuator (5). The hydraulic line passes through the ring seal inlet actuator hole (2.6) and is connected to the hydraulic device. The inlet nozzle installed at the inlet hole (6.4) of the rubber expansion body (6.1) of the suspension actuator (6) is connected to the hydraulic device through the hydraulic line passing through the suspension inlet actuator hole (2.7). Then, the connecting bolt (3) is passed from top to bottom through the full sealing and shearing device (1), the ring seal actuator receiving cylinder (2), and the suspension actuator receiving cylinder (4). Then, the suspension actuator receiving cylinder (4) is installed at the bottom of the wellhead through the wellhead connecting flange (4.1).

2. When it is necessary to suspend the coiled tubing (7), hydraulic oil is injected into the rubber expansion body (6.1) of the suspension actuator (6) through the hydraulic device. The hydraulic oil enters the power chamber (6.2) inside the rubber expansion body (6.1). Since the outer wall of the rubber expansion body (6.1) is attached to the inner wall of the cylinder liner body (4.2) of the suspension actuator, the hydraulic oil pushes the inner wall of the rubber expansion body (6.1) to be squeezed and deformed inward, thereby pushing the suspension connecting wall (6.3) to lock onto the outer wall of the coiled tubing (7), so that the coiled tubing (7) is in a static suspension state.

3. When it is necessary to perform ring sealing on the coiled tubing (7), hydraulic oil is injected into the ring sealing rubber expansion body (5.1) of the ring sealing actuator (5) through the hydraulic device. The hydraulic oil enters the ring sealing power chamber (5.2) inside the ring sealing rubber expansion body (5.1). Since the outer wall of the ring sealing rubber expansion body (5.1) is attached to the inner wall of the ring sealing actuator cylinder (2.1), the hydraulic oil pushes the inner wall of the ring sealing rubber expansion body (5.1) to be squeezed and deformed inward, thereby pushing the sealing contact surface (5.4) to be pressed against the outer wall of the coiled tubing (7). Since the sealing contact surface (5.4) of the inner wall of the ring sealing rubber expansion body (5.1) has a structure in which the inner diameter of the center gradually increases to the inner diameter of both ends, and the self-sealing structure (5.5) at both ends of the ring sealing rubber expansion body (5.1) is a triangular notch structure; under the action of hydraulic pressure, the ring sealing rubber expansion body (5.1) is locked against the outer wall of the coiled tubing (7), which plays the role of ring sealing and anti-blowout.

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