Blowout preventer for composite continuous pipe for high-temperature gas injection well

Abstract

The utility model relates to a wellhead blowout preventer, in particular to a blowout preventer for a composite continuous pipe for a high-temperature gas injection well, which is used for overcoming the defects that the existing blowout preventer for thermal recovery of heavy viscosity heavy crude oil adopts a rubber sealing element, is poor in high-temperature resistance and cannot seal high-temperature steam. The blowout prevention device for the composite continuous pipe for the high-temperature gas injection well comprises a movable sealing part, a ram blowout prevention part and a cooling assembly, the functions of a blowout prevention box and a ram blowout preventer are integrated, and a cooling circulation liquid channel and a metal heat dissipation device are integrated in the cooling assembly; the technical problem that an existing blowout preventer cannot be suitable for a high-temperature steam medium is solved.

Description

Technical Field

[0001] The utility model relates to a wellhead blowout prevention device, in particular to a composite continuous pipe blowout prevention device used in a high-temperature gas injection well. Background Art

[0002] Since heavy crude oil with high viscosity cannot flow under normal temperature and pressure conditions, steam-driven thermal recovery is generally used to recover heavy crude oil with high viscosity. That is, a natural gas boiler is used to generate high-temperature steam, which is then injected into the downhole oil layer through a thermal recovery wellhead device. After the downhole oil layer is heated and the viscosity is reduced, oil is recovered. However, this thermal recovery method will cause high carbon emissions. In order to reduce emissions and carbon, a downhole high-power electric heating steam generator is used to heat the heavy crude oil with high viscosity, so that the energy used for gas injection will gradually transition from natural gas to "green electricity".

[0003] Because the underground high-power electric heating steam generator is lowered from the gas injection wellhead device to the underground oil layer through a continuous pipe, and then water is injected into the production well to generate high-temperature steam, the formation crude oil is heated and driven into the production well, and finally the crude oil is extracted from the production well. During the operation, the wellhead of the production well must be equipped with a blowout preventer as a wellhead safety device to prevent steam leakage and ensure operation safety. However, existing blowout preventers all use rubber seals, which have poor high temperature resistance and cannot seal high-temperature steam. Utility Model Content

[0004] The utility model aims to solve the problem that the existing blowout preventers for thermal recovery of heavy viscosity heavy crude oil all use rubber seals, which have poor high temperature resistance and cannot seal high temperature steam, and provide a composite continuous pipe blowout preventer for high temperature gas injection wells.

[0005] In order to solve the deficiencies of the above-mentioned prior art, the present invention provides the following technical solutions:

[0006] A composite continuous pipe blowout prevention device for high-temperature gas injection wells, which is special in that it includes a dynamic sealing part, a gate blowout prevention part and a cooling component;

[0007] The dynamic sealing part includes an upper flange, a sealing assembly and an upper hydraulic cylinder which are coaxially arranged and connected in sequence; the upper hydraulic cylinder includes an upper hydraulic cylinder body and an upper piston arranged in the upper hydraulic cylinder body; a central through hole for passing the coiled tubing is arranged in the middle of the upper flange, the sealing assembly and the upper piston; the upper hydraulic cylinder is used to communicate with an external hydraulic control device, drive the sealing assembly to hold the coiled tubing tightly, and realize the dynamic sealing function of the coiled tubing during the lifting and lowering process;

[0008] The gate blowout prevention part includes a blowout preventer body and A gate parts; the value of A is 2 or 3; the upper end of the blowout preventer body is provided with an upper hydraulic cylinder body, the lower end is provided with a lower flange, and the blowout preventer body is provided with a vertical cavity penetrating in the vertical direction and A gate cavities penetrating in the horizontal direction; the upper end of the vertical cavity is connected to the central through hole;

[0009] The A gate parts correspond to the A gate cavities one by one, and each gate part includes a gate assembly, two locking shafts, and two gate push cylinders; the gate assembly is arranged in the corresponding gate cavity, and the outer side of the gate assembly is connected to the gate push cylinder and the locking shaft, and the gate push cylinder includes a push cylinder body, a cylinder cover, and a gate piston, and the push cylinder body and the cylinder cover form a cavity, and the gate piston is arranged in the cavity; the push cylinder body is connected to the end face of the blowout preventer body through the side door bolts; the two ends of the gate piston are respectively connected to the gate assembly and the locking shaft;

[0010] The cooling component includes a cooling circulating liquid channel, a metal heat sink, a high temperature resistant non-metallic heat insulating rubber tube and a temperature monitoring instrument; the cooling circulating liquid channel is arranged on the blowout preventer body, including A circulating channels respectively arranged on the bottom wall of the corresponding gate cavity, and each circulating channel is provided with a liquid inlet and a liquid outlet;

[0011] The metal heat dissipation device comprises two heat sink assemblies symmetrically arranged at the lower part of the blowout preventer body along the axis of the blowout preventer body; the high temperature resistant non-metallic heat insulating rubber tube is arranged in the upper neck of the lower flange; the temperature monitoring instrument is arranged on the side wall of the vertical cavity (211) between the two gate cavities for detecting its temperature.

[0012] Furthermore, the sealing assembly includes an upper rubber cylinder, a sealing sleeve, and a transition sleeve which are coaxially arranged in sequence from the inside to the outside, the upper end of the transition sleeve is threadedly connected to the upper flange, and the lower end is threadedly connected to the upper hydraulic cylinder body; an upper bushing is provided between the upper end of the upper rubber cylinder and the upper flange, a lower bushing is provided between the lower end and the upper piston, and the center through hole is provided in the middle.

[0013] Furthermore, the end surface of the pushing fluid cylinder body is provided with an outer cone, the inner wall of the gate cavity is provided with an inner cone matching the outer cone, and a first sealing member is provided between the pushing fluid cylinder body and the inner wall of the gate cavity.

[0014] Furthermore, a gap is provided between the pushing cylinder body and the end surface of the blowout preventer body for accommodating the thermal expansion volume of the blowout preventer body.

[0015] The side door bolts are always in a compressed state at high temperature, so that the conical metal hard seal is always in a tightly fitted state, ensuring the reliability of the seal here.

[0016] Furthermore, the pushing cylinder body is slidably connected to the gate assembly via a guide rod arranged thereon.

[0017] The gate cavity is connected to the external hydraulic control device. The energy for the gate's opening and closing reciprocating motion comes from the hydraulic energy in the gate's pushing cylinder.

[0018] Furthermore, the upper hydraulic cylinder body of the upper hydraulic cylinder is an integrated part with the blowout preventer body.

[0019] Furthermore, each of the heat sink assemblies includes a bottom plate, a top plate, and a plurality of partitions arranged between the bottom plate and the top plate and parallel to each other, the plurality of partitions are perpendicular to the axis of the locking shaft, and a spacer is provided between two adjacent partitions; the bottom plate, the top plate and the plurality of partitions constitute a heat dissipation shell, the upper end of the heat dissipation shell is provided with a first groove for accommodating the blowout preventer body in the vertical direction, and one side is provided with a second groove for accommodating the neck of the lower flange in the horizontal direction, the bottom surface of the first groove is provided with a connecting plate, and the connecting plate is connected to the bottom surface of the cube part of the blowout preventer body; a plurality of through holes are provided on the bottom plate to facilitate gas circulation and heat dissipation.

[0020] Furthermore, each of the circulation channels includes two transverse channels and six longitudinal channels. The transverse channels and the longitudinal channels are perpendicular to each other. The two transverse channels are connected to the six longitudinal channels respectively. One end of a transverse channel is connected to the outside as a liquid inlet, and one end of the other transverse channel is connected to the outside as a liquid outlet.

[0021] Furthermore, the first sealing component and the high temperature resistant non-metallic heat insulating rubber tube are both made of perfluoroether rubber material.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] (1) The utility model discloses a composite continuous tubing blowout preventer for high-temperature gas injection wells, comprising a dynamic sealing portion, a gate blowout preventer portion and a cooling component, integrating the functions of a blowout preventer box and a gate blowout preventer, and integrating a cooling circulating fluid channel and a metal heat sink in the cooling component, thereby solving the technical problem that the existing blowout preventer cannot be applied to high-temperature steam media.

[0024] (2) The utility model is a composite coiled tubing blowout preventer for high-temperature gas injection wells. A circulation channel is provided in the bottom wall of each gate cavity in the blowout preventer body. The cooling liquid provided by the external circulation system can reduce the temperature of the gate sealing cavity. At the same time, a metal heat sink is provided at the bottom of the blowout preventer body to reduce the internal temperature of the blowout preventer by heat conduction.

[0025] (3) In the blowout preventer for composite coiled tubing used in high-temperature gas injection wells of the utility model, a high-temperature resistant non-metallic heat-insulating rubber tube is arranged in the neck of the blowout preventer body, which can ensure the normal lifting and lowering of the coiled tubing while directly preventing the steam from rising, isolating most of the high-temperature steam below the gate cavity, and preventing the cold and hot air flows from meeting to form an air vortex; in addition, all non-metallic sealing components are made of perfluoroether rubber material, which can withstand temperatures above 300°, thus solving the problem of the short-term effectiveness of existing blowout preventer seals at high temperatures.

[0026] (4) The utility model is a composite continuous pipe blowout prevention device for high-temperature gas injection wells. A composite structure of a conical metal hard seal and a non-metallic sealing ring is used between the push cylinder body and the blowout preventer body to ensure the reliability of the seal. At the same time, considering the expansion effect of high temperature on the blowout preventer body, a gap is provided between the push cylinder body and the end face of the blowout preventer body to accommodate the thermal expansion volume. The side door bolts are always in a compressed state at high temperatures, so that the conical metal hard seal is always in a tightly matched state, ensuring the reliability of the seal here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a front view of an embodiment of a composite continuous tubing blowout prevention device for a high-temperature gas injection well according to the utility model;

[0028] Figure 2 for Figure 1 Side view of

[0029] Figure 3 for Figure 1 A partial enlarged view of point I in the middle;

[0030] Figure 4 for Figure 1 AA section view in;

[0031] Figure 5 for Figure 1 BB section view in;

[0032] Figure 6 for Figure 1 CC section view in;

[0033] Figure 7 This is a schematic structural diagram of the blowout preventer body in the embodiment of the utility model;

[0034] Figure 8 This is a front view of a metal heat sink in an embodiment of the utility model;

[0035] Fig. 9 It is a side view of the metal heat sink in the embodiment of the utility model;

[0036] Fig.10 for Figure 8DD section view in;

[0037] Fig.11 for Figure 8 EE cross-sectional view in;

[0038] Fig.12 It is a structural schematic diagram of the blowout prevention device closing chamber and the blowout prevention device opening chamber in the embodiment of the utility model.

[0039] The reference numerals are as follows: 1-dynamic sealing part, 11-upper flange, 12-transition sleeve, 13-upper hydraulic cylinder, 131-upper hydraulic cylinder body, 132-upper piston, 14-upper rubber cylinder, 15-sealing sleeve, 16-upper bushing, 17-lower bushing;

[0040] 2-gate blowout prevention part, 21-blowout preventer body, 211-vertical cavity, 212-gate cavity, 213-inner cone, 22-gate assembly, 23-locking shaft, 24-gate push cylinder, 241-push cylinder body, 242-cylinder cover, 243-gate piston, 244-outer cone, 25-side door bolt, 26-first seal, 27-gap, 28-guide rod, 29-lower flange; 201-blowout prevention device opening cavity; 202-blowout prevention device closing cavity;

[0041] 3-cooling circulation liquid channel, 31-transverse channel, 32-longitudinal channel, 33-liquid inlet, 34-liquid outlet;

[0042] 4-metal heat sink, 41-heat sink assembly, 411-bottom plate, 412-top plate, 413-partition plate, 414-first groove, 415-connecting plate, 416-through hole, 417-spacer, 418-second groove;

[0043] 5-High temperature resistant non-metallic heat insulating rubber tube; 6-Temperature monitoring instrument. DETAILED DESCRIPTION

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

[0045] Reference Figures 1 to 12 A composite continuous pipe blowout prevention device for a high-temperature gas injection well comprises a dynamic sealing part 1, a gate blowout prevention part 2 and a cooling component.

[0046] The dynamic seal part 1 comprises an upper flange 11, a sealing assembly, an upper hydraulic cylinder 13, an upper bushing 16 and a lower bushing 17 which are coaxially arranged and sequentially connected. The upper hydraulic cylinder 13 comprises an upper hydraulic cylinder body 131 and an upper piston 132 arranged in the upper hydraulic cylinder body 131.

[0047] The sealing assembly includes an upper rubber cylinder 14, a sealing sleeve 15, and a transition sleeve 12 which are coaxially arranged from the inside to the outside. The upper rubber cylinder 14 is a two-half type. The upper end of the transition sleeve 12 is threadedly connected to the upper flange 11, and the lower end is threadedly connected to the upper hydraulic cylinder body 131. An upper bushing 16 is arranged between the upper end of the upper rubber cylinder 14 and the upper flange 11, and a lower bushing 17 is arranged between the lower end and the upper piston 132. The upper rubber cylinder 14 can be compressed by manually tightening the threads between the upper flange 11 and the transition sleeve 12.

[0048] A central through hole for passing the coiled tubing is provided in the middle of the upper flange 11, the upper rubber cylinder 14 of the sealing assembly, and the upper piston 132. The upper hydraulic cylinder 13 is used to communicate with an external hydraulic control device. When the external hydraulic control device supplies fluid to the upper hydraulic cylinder 13, the upper piston 132 pushes the lower bushing 17 upward and compresses the upper rubber cylinder 14, so that the upper rubber cylinder 14 is squeezed and deformed and then tightly holds the coiled tubing to form a closed space, thereby realizing the dynamic sealing function of the coiled tubing during the lifting and lowering process.

[0049] The gate blowout prevention part 2 includes a blowout preventer body 21, a gate part and a lower flange; Figure 7 The upper end of the blowout preventer body 21 is provided with an upper hydraulic cylinder 13, and the lower end is provided with a lower flange 29. The blowout preventer body 21 is provided with a vertical cavity 211 penetrating in the vertical direction and A gate cavities 212 penetrating in the horizontal direction; the upper end of the vertical cavity 211 is connected to the central through hole; the value of A can be 2 or 3, and is 2 in this embodiment.

[0050] In order to make the structure more compact, the upper hydraulic cylinder body 131 of the upper hydraulic cylinder 13 and the blowout preventer body 21 are integrated.

[0051] The gate part corresponds to the gate cavity 212 one by one, and each gate part includes a gate assembly 22, two locking shafts 23, and two gate push cylinders 24. The gate assembly 22 is arranged in the corresponding gate cavity 212, and a locking shaft 23 and a gate push cylinder 24 are arranged at both ends of the gate assembly 22. The gate push cylinder 24 includes a push cylinder body 241, a cylinder cover 242 and a gate piston 243. The push cylinder body 241 and the cylinder cover 242 form a cavity, and the gate piston 243 is arranged in the cavity. The push cylinder body 241 is connected to the end surface of the blowout preventer body 21 through the side door bolts 25. The gate assembly 22 and the locking shaft 23 are connected to the gate piston 243 at both ends.

[0052] In order to ensure the reliability of the seal, the seal between the pusher cylinder body 241 and the blowout preventer body 21 adopts a composite structure of a conical metal hard seal and a non-metallic sealing ring. Specifically, the end face of the pusher cylinder body 241 is provided with an outer conical surface 244, and the inner wall of the gate cavity 212 is provided with an inner conical surface 213 matched with the outer conical surface 244. The outer conical surface 244 and the inner conical surface 213 constitute a conical metal hard seal; a first sealing member 26 is provided between the pusher cylinder body 241 and the inner wall of the gate cavity 212.

[0053] Reference Figure 3 At the same time, considering the effect of high temperature on the expansion of the BOP body 21, a gap 27 for accommodating the volume thermal expansion of the BOP body 21 is provided between the push cylinder body 241 and the end face of the BOP body 21. The side door bolts 25 are always in a compressed state at high temperature, so that the conical metal hard seal is always in a tightly matched state, ensuring the reliability of the seal here.

[0054] Reference Figure 1 For better guidance, the push cylinder body 241 is slidably connected to the gate assembly 22 through the guide rod 28 provided thereon. The gate cavity 212 is connected to the external hydraulic control device. The energy for the reciprocating motion of the gate is derived from the hydraulic energy in the gate push cylinder 24.

[0055] The pipeline of the external hydraulic control device and the blowout prevention device closing chamber 202 and the blowout prevention device opening chamber 201 ( Fig.12 When it is necessary to close, the hydraulic oil enters the closing chamber 202 of the blowout preventer from the external hydraulic control device, pushing the gate piston 243 to move toward the center of the wellhead, driving the gate to move toward the center, thereby holding the coiled tubing tightly to achieve the purpose of closing the wellhead. When it is necessary to open, the blowout preventer opening chamber 201 only needs to be filled with oil, and the gate piston 243 moves outward, driving the gate to move outward. Its working principle is similar to that of a conventional double-gate blowout preventer, and will not be described in detail here.

[0056] The cooling component includes a cooling circulation fluid channel 3, a metal heat dissipation device 4, a high temperature resistant non-metallic heat insulating rubber tube 5 and a temperature monitoring instrument 6.

[0057] Reference Figures 1 to 6 The cooling circulating liquid channel 3 is arranged on the blowout preventer body 21, and includes A circulating channels respectively arranged on the bottom wall of the corresponding gate cavity 212; each circulating channel includes two transverse channels 31 and six longitudinal channels 32, the transverse channels 31 and the longitudinal channels 32 are perpendicular to each other, the two transverse channels 31 are respectively connected with the six longitudinal channels 32, one end of one transverse channel 31 is connected with the outside as a liquid inlet 33, and one end of the other transverse channel 31 is connected with the outside as a liquid outlet 34.

[0058] Reference Figures 8 to 11The metal heat sink 4 includes two heat sink assemblies 41 symmetrically arranged at the lower part of the blowout preventer body 21 along the axis of the blowout preventer body 21; each heat sink assembly 41 includes a bottom plate 411, a top plate 412, and a plurality of partitions 413 arranged between the bottom plate 411 and the top plate 412 and parallel to each other, the plurality of partitions 413 are perpendicular to the axis of the locking shaft 23, and a spacer 417 is arranged between two adjacent partitions 413 to prevent the partitions 413 from deforming; the bottom plate 411, the top plate 412, and the plurality of partitions 413 are arranged between the bottom plate 411 and the top plate 412. 412 and a plurality of partitions 413 constitute a heat dissipation shell, the upper end of the heat dissipation shell is provided with a first groove 414 for accommodating the blowout preventer body 21 in the vertical direction, and one side is provided with a second groove 418 for accommodating the neck of the lower flange 29 in the horizontal direction, the bottom surface of the first groove 414 is provided with a connecting plate 415, and the connecting plate 415 and the bottom surface of the cube part of the blowout preventer body 21 are connected by bolts; the bottom plate 411 is provided with a plurality of through holes 416 for detecting its temperature.

[0059] The bottom plate 411, the top plate 412, the partition plate 413 and the connecting plate 415 are all made of aluminum alloy with good heat dissipation performance and low density. Thus, the metal heat sink 4 reduces the internal temperature of the blowout prevention device by heat conduction.

[0060] Reference Figure 1 The high temperature resistant non-metallic heat insulating rubber tube 5 is arranged in the upper neck of the lower flange 29, which can directly prevent the steam from rising and prevent the cold and hot air flows from meeting to form an air vortex while ensuring the normal lifting and lowering of the coiled pipe.

[0061] Reference Figure 2 The temperature monitoring instrument 6 is arranged on the BOP body 21 to detect the temperature of the portion of the vertical cavity 211 between the two gate cavities 212. Thus, the temperature value after cooling can be accurately measured to provide real-time data feedback for construction operations.

[0062] In addition, for the working conditions where the sealing medium is high-temperature steam, all non-metallic seals of the blowout preventer are made of perfluoroether rubber material. All non-metallic seals can withstand temperatures above 300°, solving the problem of short-term high-temperature performance of existing blowout preventer seals.

Claims

1. A composite coiled tubing blowout preventer for high-temperature gas injection wells, characterized in that: It comprises a dynamic sealing part (1), a gate blowout prevention part (2) and a cooling component; The dynamic sealing part (1) comprises an upper flange (11), a sealing assembly and an upper hydraulic cylinder (13) which are coaxially arranged and connected in sequence; the upper hydraulic cylinder (13) comprises an upper hydraulic cylinder body (131) and an upper piston (132) arranged in the upper hydraulic cylinder body (131); a central through hole for passing the coiled tubing is arranged in the middle of the upper flange (11), the sealing assembly and the upper piston (132); the upper hydraulic cylinder (13) is used to communicate with an external hydraulic control device to drive the sealing assembly to hold the coiled tubing tightly, thereby realizing a dynamic sealing function during the coiled tubing lifting and lowering process; The gate blowout prevention part (2) comprises a blowout preventer body (21) and A gate parts; the value of A is 2 or 3; the upper end of the blowout preventer body (21) is provided with the upper hydraulic cylinder body (131), the lower end is provided with a lower flange (29), and the blowout preventer body (21) is provided with a vertical cavity (211) penetrating in the vertical direction and A gate cavities (212) penetrating in the horizontal direction; the upper end of the vertical cavity (211) is connected to the central through hole; The A gate parts correspond to the A gate cavities (212) one by one, and each gate part comprises a gate assembly (22), two locking shafts (23), and two gate push cylinders (24); the gate assembly (22) is arranged in the corresponding gate cavity (212), the outer side of the gate assembly (22) is connected to the gate push cylinder (24) and the locking shaft (23), the gate push cylinder (24) comprises a push cylinder body (241), a cylinder cover (242), and a gate piston (243); the push cylinder body (241) and the cylinder cover (242) form a cavity, and the gate piston (243) is arranged in the cavity; the push cylinder body (241) is connected to the end surface of the blowout preventer body (21) through the side door bolts (25); the two ends of the gate piston (243) are respectively connected to the gate assembly (22) and the locking shaft (23); The cooling component comprises a cooling circulating liquid channel (3), a metal heat dissipation device (4), a high temperature resistant non-metallic heat insulating rubber tube (5) and a temperature monitoring instrument (6); the cooling circulating liquid channel (3) is arranged on the blowout preventer body (21), and comprises A circulating channels respectively arranged on the bottom wall of the corresponding gate cavity (212), and each circulating channel is provided with a liquid inlet (33) and a liquid outlet (34); The metal heat sink (4) comprises two heat sink assemblies (41) symmetrically arranged at the lower part of the blowout preventer body (21) along the axis of the blowout preventer body (21); the high temperature resistant non-metallic heat insulating rubber tube (5) is arranged in the upper neck of the lower flange (29); the temperature monitoring instrument (6) is arranged on the side wall of the vertical cavity (211) between the two gate cavities (212) for detecting its temperature.

2. The composite coiled tubing blowout preventer for high-temperature gas injection wells according to claim 1, characterized in that: The sealing assembly comprises an upper rubber cylinder (14), a sealing sleeve (15), and a transition sleeve (12) which are coaxially arranged in sequence from the inside to the outside. The upper end of the transition sleeve (12) is threadedly connected to the upper flange (11), and the lower end is threadedly connected to the upper hydraulic cylinder body (131); an upper bushing (16) is arranged between the upper end of the upper rubber cylinder (14) and the upper flange (11), and a lower bushing (17) is arranged between the lower end and the upper piston (132), and the central through hole is arranged in the middle.

3. The blowout prevention device for composite coiled tubing used in high-temperature gas injection wells according to claim 2, characterized in that: The end surface of the pushing liquid cylinder body (241) is provided with an outer cone (244), the inner wall of the gate cavity (212) is provided with an inner cone (213) matched with the outer cone (244), and a first sealing member (26) is provided between the pushing liquid cylinder body (241) and the inner wall of the gate cavity (212).

4. The blowout prevention device for composite coiled tubing used in high-temperature gas injection wells according to claim 3, characterized in that: A gap (27) for accommodating thermal expansion of the volume of the blowout preventer body (21) is provided between the push cylinder body (241) and the end surface of the blowout preventer body (21).

5. A composite coiled tubing blowout preventer for high-temperature gas injection wells according to claim 4, characterized in that: The pushing liquid cylinder body (241) is slidably connected to the gate assembly (22) via a guide rod (28) arranged thereon.

6. A composite coiled tubing blowout preventer for high-temperature gas injection wells according to claim 5, characterized in that: The upper hydraulic cylinder body (131) of the upper hydraulic cylinder (13) and the blowout preventer body (21) are integrated.

7. The composite coiled tubing blowout preventer for high-temperature gas injection wells according to claim 1, characterized in that: Each of the heat sink assemblies (41) comprises a bottom plate (411), a top plate (412), and a plurality of partitions (413) arranged between the bottom plate (411) and the top plate (412) and parallel to each other, wherein the plurality of partitions (413) are perpendicular to the axis of the locking shaft (23), and a spacer sleeve (417) is arranged between two adjacent partitions (413); the bottom plate (411), the top plate (412) and the plurality of partitions (413) constitute a heat sink housing, and the upper end of the heat sink housing A first groove (414) for accommodating the blowout preventer body (21) is arranged in the vertical direction, and a second groove (418) for accommodating the neck of the lower flange (29) is arranged in the horizontal direction on one side. A connecting plate (415) is arranged on the bottom surface of the first groove (414), and the connecting plate (415) is connected to the bottom surface of the cube part of the blowout preventer body (21); a plurality of through holes (416) are distributed on the bottom plate (411) to facilitate gas circulation and heat dissipation.

8. The composite coiled tubing blowout preventer for high-temperature gas injection wells according to claim 2, characterized in that: Each of the circulation channels comprises two transverse channels (31) and six longitudinal channels (32); the transverse channels (31) and the longitudinal channels (32) are perpendicular to each other; the two transverse channels (31) are respectively connected to the six longitudinal channels (32); one end of one transverse channel (31) is connected to the outside as a liquid inlet (33); and one end of the other transverse channel (31) is connected to the outside as a liquid outlet (34).

9. The composite coiled tubing blowout preventer for high-temperature gas injection wells according to claim 3, characterized in that: The first sealing member (26) and the high temperature resistant non-metallic heat insulating rubber tube (5) are both made of perfluoroether rubber material.

Images