Wellhead sealing device

Abstract

The present invention provides a wellhead sealing device, which belongs to the technical field of oilfield exploitation. The device includes: a base, a hanger assembly and a deformable sealing assembly; the base is sealed and connected to the wellhead, and a first chamfered structure is arranged on the surface of the through hole of the base; the hanger assembly is fixedly arranged inside the through hole, and the hanger assembly seals the oil pipe in the well, and the hanger assembly includes: a hanger body and a support ring sleeved on the hanger body, and the hanger body has a protruding structure, and the support ring is provided with a first through groove; the deformable sealing assembly is arranged between the hanger assembly and the base, and the deformable sealing assembly is sleeved in the area defined by the protruding structure and the support ring, and the second through groove arranged on the deformable sealing assembly is connected with the first through groove for the cable to pass through; wherein, a second chamfered structure is arranged at one end of the support ring away from the deformable sealing assembly, and the second chamfered structure is engaged with the first chamfered structure. The present invention is used to seal the wellhead.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield exploitation, and in particular to a wellhead sealing device. Background Art

[0002] In petroleum engineering, different amounts of water can be injected into different injection layers in the water injection well through stratified water injection technology (for example, cabled intelligent stratified water injection technology) to achieve the purpose of increasing the production of oil wells that are connected to the water injection wells. In the process of cabled intelligent stratified water injection, it is necessary to provide power and transmit signals to the intelligent water distributor set in the water injection well through cables, so as to inject water into the oil layer through the water distributor.

[0003] In order to achieve the purpose of communication and control of the whole well during the stratified water injection process, the cable needs to be installed on the outer wall of the pipe string during the construction phase of the water injection well, and the cable is lowered into the well along with the pipe string. In order to facilitate construction, the cable that has not been lowered into the well is usually placed at the wellhead during the construction interval.

[0004] However, since the cable runs along the wellhead, the existing device cannot seal the wellhead, and the material in the well (for example, water and other liquids in the injection well) may leak, posing a safety hazard to well control. Summary of the invention

[0005] The present invention provides a wellhead sealing device, which can solve the problem in the related art that the existing device cannot seal the wellhead due to the cable running along the wellhead. The technical solution is as follows:

[0006] A wellhead sealing device is provided, the device comprising: a base, a hanger assembly and a deformable sealing assembly;

[0007] The base is used for sealing connection with the wellhead, the base is provided with a through hole, and a first chamfered structure is provided on the surface of the through hole;

[0008] The hanger assembly is fixedly arranged inside the through hole, and is used to seal the oil pipe in the well. The hanger assembly comprises: a hanger body and a support ring sleeved on the hanger body, and the hanger body has a convex structure, and the support ring is provided with a first through groove;

[0009] The deformable sealing component is fixedly arranged between the hanger component and the base, and the deformable sealing component is sleeved in the area defined by the protruding structure and the support ring, and a second through groove is arranged on the deformable sealing component, and the second through groove is communicated with the first through groove for allowing the cable to pass through;

[0010] Wherein, a second chamfered structure is provided at one end of the support ring away from the deformable sealing assembly, and the second chamfered structure is used to engage with the first chamfered structure. The base, the hanger assembly and the deformable sealing assembly embedded with the cable are used to seal the wellhead.

[0011] Optionally, at least one of the first end face and the second end face of the deformable sealing assembly is inlaid with a washer, the first end face is the end face of the deformable sealing assembly used to contact the protruding structure, and the second end face is the end face of the deformable sealing assembly used to contact the support ring.

[0012] Optionally, the groove body of the second through groove is in contact with the base.

[0013] Optionally, the groove body of the second through groove includes: a sub-groove body arranged inside the deformable sealing component and cutouts arranged on both sides of the sub-groove body and penetrating the deformable sealing component.

[0014] Optionally, a third through slot is provided on the protruding structure, and the third through slot is communicated with the second through slot for allowing the cable to pass through.

[0015] Optionally, the hanger assembly further comprises: a limit ring sleeved on the hanger body, the limit ring being arranged on a side of the support ring away from the deformable sealing assembly, the limit ring being used to limit the installation position of the deformable sealing assembly and the support ring.

[0016] Optionally, an orthographic projection of the limiting ring on the outlet surface of the through hole does not overlap with an orthographic projection of the second through groove on the outlet surface of the through hole.

[0017] Optionally, a third chamfered structure is provided at one end of the protruding structure away from the deformable sealing component;

[0018] The device further comprises: a jackscrew assembly, the jackscrew assembly is movably connected to the base, and the jackscrew assembly is used to define the installation position of the third chamfered structure.

[0019] Optionally, a jackscrew mounting hole is provided on the base, the jackscrew assembly includes: a jackscrew, and the device further includes: a second sealing assembly, and the second sealing assembly is provided between the jackscrew mounting hole and the jackscrew.

[0020] Optionally, the top screw assembly and the first chamfer structure are respectively arranged at the top and bottom ends of the wellhead sealing device.

[0021] The wellhead sealing device provided in an embodiment of the present invention has a base sealedly connected to the wellhead, and a deformable sealing component fixedly arranged between the hanger assembly and the base, so that the cable can pass through the second through groove of the deformable sealing component, and when the cable passes through the second through groove, the deformable sealing component can be squeezed by the protruding structure and the supporting ring to ensure the sealing between the cable and the deformable sealing component, and then the wellhead is sealed by the base, the hanger assembly and the deformable sealing component embedded with the cable. Compared with the related art, the problem of being unable to seal the well during construction breaks can be solved, the probability of leakage of materials in the well is reduced, and the potential safety hazards of well control in water injection wells during construction breaks are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a structural schematic diagram of a wellhead sealing device provided by an embodiment of the present invention.

[0024] Figure 2 It is a structural schematic diagram of a hanger assembly provided by an embodiment of the present invention.

[0025] Figure 3 It is a schematic structural diagram of another wellhead sealing device provided in an embodiment of the present invention.

[0026] Figure 4 It is a structural schematic diagram of a deformable sealing component provided by an embodiment of the present invention.

[0027] Figure 5 It is a schematic structural diagram of another deformable sealing component provided by an embodiment of the present invention.

[0028] Figure 6 The present invention provides a flowchart of a well sealing method. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] The embodiment of the present invention provides a wellhead sealing device, which can solve the problem in the related art that the wellhead cannot be sealed due to the cable running along the wellhead, such as Figure 1 As shown, the device may include: a base 101 , a hanger assembly 102 and a deformable sealing assembly 103 .

[0031] The base 101 is used for sealing connection with the wellhead, and a through hole is provided on the base 101, and a first chamfered structure is provided on the surface of the through hole. For example, during the intermittent stage of the cable intelligent injection construction of the water injection well, the base 101 can be set at the wellhead of the water injection well, and at this time, the extension direction of the through hole can be parallel to the depth direction of the water injection well.

[0032] The hanger assembly 102 can be fixedly arranged inside the through hole, and the hanger assembly 102 is used to seal the oil pipe. For example, during the intermittent stage of water injection well construction, one end of the hanger assembly 102 can be connected to the oil pipe, and the other end of the hanger assembly 102 can be connected to a well sealing device (such as a plug valve), and the oil pipe is sealed by the well sealing device to prevent leakage of substances in the oil pipe.

[0033] The hanger assembly 102 may include: a hanger body 1021 and a support ring 1022 sleeved on the hanger body 1021. The hanger body 1021 has a protruding structure. The support ring 1022 is provided with a first through groove.

[0034] The deformable sealing component 103 is fixedly arranged between the hanger component 102 and the base 101, and the deformable sealing component 103 is sleeved in the area defined by the protruding structure and the support ring 1022. A second through groove is arranged on the deformable sealing component 103. The second through groove is connected to the first through groove and is used for passing the cable. When the wellhead sealing device is arranged at the wellhead, the extension direction of the second through groove is parallel to the well depth direction. When the deformable sealing component 103 is sleeved in the area defined by the protruding structure and the support ring 1022, the deformable sealing component 103 can be fixed by the protruding structure and the support ring 1022. Furthermore, the deformable sealing component 103 can be squeezed by applying forces in opposite directions through the protruding structure and the supporting ring 1022 to improve the sealing performance between the deformable sealing component 103 and the cable, so that the deformable sealing component 103 can isolate the areas on the upper and lower sides of the deformable sealing component 103 to seal the liquid in the oil casing annulus in the oil casing annulus to avoid leakage. The oil casing annulus is the area between the pipe string and the casing, and the oil pipe is arranged inside the pipe string.

[0035] Optionally, in order to ensure the sealing between the cable and the deformable sealing component 103, the angle between the extension direction of the first through slot and the extension direction of the through hole can be less than a preset angle threshold, and / or the angle between the extension direction of the second through slot and the extension direction of the through hole can be less than a preset angle threshold, so as to facilitate the passage of the cable. Furthermore, the extension direction of the first through slot can be the same as the extension direction of the second through slot, so as to further ensure the sealing between the cable and the deformable sealing component 103.

[0036] The end of the support ring 1022 away from the deformable sealing assembly 103 may be provided with a second chamfered structure. The second chamfered structure is used to engage with the first chamfered structure. By engaging the first chamfered structure with the second chamfered structure, the hanger assembly 102 can be hung inside the through hole of the base 101. When the wellhead sealing device is set on the wellhead of the water injection well, the hanger assembly 102 can be prevented from falling into the well.

[0037] Optionally, the deformable sealing component 103 may be a sealing ring, and the deformable sealing component 103 may be made of rubber. In addition, in order to ensure that the cable in the oil casing annulus is effectively insulated from the liquid in the oil casing annulus, the cable may be an armored cable.

[0038] To summarize, the wellhead sealing device provided in the embodiment of the present invention has a base sealedly connected to the wellhead, and a deformable sealing component fixedly arranged between the hanger assembly and the base, so that the cable can pass through the second through groove of the deformable sealing component, and when the cable passes through the second through groove, the deformable sealing component can be squeezed by the protruding structure and the support ring to ensure the sealing between the cable and the deformable sealing component, and then the wellhead is sealed through the base, the hanger assembly and the deformable sealing component embedded with the cable. Compared with the related art, the problem of being unable to seal the well during construction breaks can be solved, the probability of leakage of materials in the well is reduced, and the potential safety hazards of well control in water injection wells during construction breaks are reduced.

[0039] In order to ensure that the support ring 1022 does not hinder the cable, on the one hand, the orthographic projection of the support ring 1022 on the outlet surface of the through hole may not overlap with the orthographic projection of the second through groove on the outlet surface of the through hole. On the other hand, the orthographic projection of the second through groove on the outlet surface of the through hole may be located within the orthographic projection of the contact surface between the support ring 1022 and the base 101 on the outlet surface of the through hole. In this case, a first through groove may be provided on the support ring 1022. The notch of the first through groove toward the second through groove may cover the notch of the second through groove toward the first through groove. For example, the orthographic projection of the second through groove on the outlet surface of the through hole may be located inside the orthographic projection of the first through groove on the outlet surface of the through hole, or the orthographic projection of the second through groove on the outlet surface of the through hole may overlap with the orthographic projection of the first through groove on the outlet surface of the through hole, so that the cable can pass through the first through groove and the second through groove in sequence.

[0040] And, if Figure 2 As shown, a third through slot may be provided on the protruding structure 10211. The third through slot is connected to the second through slot for allowing the cable to pass through. The notch of the third through slot toward the second through slot may cover the notch of the second through slot toward the third through slot. For example, the orthographic projection of the third through slot on the outlet surface of the through hole may cover the orthographic projection of the second through slot on the outlet surface of the through hole, so that the cable can pass through the first through slot, the second through slot and the third through slot in sequence.

[0041] Alternatively, if Figure 3 As shown, the base 101 can be a lifting nipple. The first end A of the lifting nipple can be sealed and connected to the wellhead. In order to ensure the sealing between the lifting nipple and the wellhead, the lifting nipple and the wellhead can be connected by a flange. In addition, a sealing steel ring groove can be provided on the first end A and the second end B of the lifting nipple. When the first end A of the lifting nipple is connected to the wellhead, a sealing steel ring can be provided in the sealing steel ring groove on the first end A to further ensure the sealing of the connection between the lifting nipple and the wellhead. Similarly, when the second end B of the lifting nipple is connected to other components, a sealing steel ring can be provided in the sealing steel ring groove on the second end B to ensure the sealing of the connection.

[0042] For further information, please continue to refer to Figure 3 The hanger body 1021 may be a tubing hanger. The lower end of the tubing hanger is used for sealing connection with the tubing 105, and the upper end of the tubing hanger is used for fixed connection with the well sealing device to seal the tubing 105. Optionally, the tubing hanger and the tubing 105 may be connected by a tapered thread, and the tapered thread connection may improve the sealing performance of the connection between the tubing hanger and the tubing 105.

[0043] Furthermore, the groove body of the second through groove can contact the base 101. When the groove body of the second through groove can contact the base 101, during the process of installing the wellhead sealing device at the wellhead, the cable can be embedded into the second through groove from the side of the deformable sealing component 103 close to the base 101, so as to simplify the installation process of the wellhead sealing device.

[0044] The second through groove may include: a sub-groove disposed inside the deformable sealing component 103 and cutouts disposed on both sides of the sub-groove that penetrate the deformable sealing component 103. The shape of the sub-groove may be set according to the shape of the longitudinal section of the cable to be embedded in the extension direction of the cable, so as to ensure that the embedded cable and the deformable sealing component 103 can fit well. For example, when the longitudinal section of the cable in the extension direction is circular, the shape of the sub-groove may be circular. Figure 4 is a top view of the deformable sealing component 103, as shown in Figure 4 As shown, a circular sub-groove is provided on the annular deformable sealing component 103 , and cutouts penetrating the deformable sealing component 103 are provided on both sides of the sub-groove.

[0045] Figure 5 for Figure 4 Schematic diagram of the cross section at CC'. Figure 4 and 5 As shown, at least one of the first end face and the second end face of the deformable sealing component 103 may be inlaid with a washer 106. The first end face is the end face of the deformable sealing component 103 for contacting the protruding structure 10211, and the second end face is the end face of the deformable sealing component 103 for contacting the support ring 1022. Optionally, the washer 106 may be inlaid in the deformable sealing component 103 through a vulcanization process. By inlaying the washer 106 in the deformable sealing component 103, it is possible to prevent the loss of rubber when the deformable sealing component 103 is extruded.

[0046] In an implementable manner, the hanger assembly may further include: a limiting ring sleeved on the hanger body 1021. The limiting ring may be arranged on a side of the support ring 1022 away from the deformable sealing assembly 103, and the limiting ring may be fixedly connected to the hanger body 1021.

[0047] Optionally, please continue to refer to Figure 2, the limiting ring 1023 can be fixedly connected with the hanger body 1021 by means of threads or the like. For example: the surface of the hanger body 1021 that is used to contact the limiting ring 1023 can be provided with an external thread, and the inner ring of the limiting ring 1023 can be provided with an internal thread, and the size of the internal thread matches the size of the external thread, and the limiting ring 1023 and the hanger body 1021 can be connected by the internal thread and the external thread. When the limiting ring 1023 is connected with the hanger body 1021 by threads, during the process of installing the limiting ring 1023, the limiting ring 1023 can be rotated to displace the limiting ring 1023 relative to the hanger body 1021, so as to fix the limiting ring 1023 at a preset position. Furthermore, when the stop ring is fixed at a preset position, the hanger body 1021 can squeeze the support ring 1022 and the deformable sealing assembly 103 under the weight of the oil pipe 105 in the well, further improving the sealing performance between the deformable sealing assembly 103 and the cable. At the same time, when the stop ring 1023 is connected to the hanger body 1021 through threads, the process of installing and removing the stop ring 1023 is relatively simple, which can simplify the installation and removal process of the wellhead sealing device.

[0048] During the installation process of the wellhead sealing device, the deformable sealing assembly 103, the support ring 1022 and the limit ring 1023 can be sequentially sleeved on the hanger body 1021, and then the limit ring 1023 can be fixed on the hanger body 1021, so that the installation position of the deformable sealing assembly 103 and the support ring 1022 can be fixed at a preset position through the limit ring 1023.

[0049] Furthermore, when the installation positions of the deformable sealing component 103 and the support ring 1022 are controlled by the limiting ring 1023, the installation tightness of the deformable sealing component 103 and the support ring 1022 can be adjusted by adjusting the contact position between the limiting ring 1023 and the hanger body 1021, so that the deformable sealing component 103 can effectively contact other components such as cables, thereby ensuring the sealing of the connection.

[0050] It should be noted that the orthographic projection of the limit ring 1023 on the outlet surface of the through hole may not overlap with the orthographic projection of the second through groove on the outlet surface of the through hole, so that the limit ring 1023 will not hinder the cable from passing through the first through groove, the second through groove and the third through groove in sequence.

[0051] Furthermore, the protruding structure 10211 may be provided with a third chamfered structure at one end away from the deformable sealing component 103. Figure 3As shown, the wellhead sealing device may also include: a top screw assembly 104. The top screw assembly 104 is movably connected to the base 101, and the top screw assembly 104 is used to define the installation position of the third chamfer structure. The top screw assembly 104 can fix the hanger assembly 102 inside the through hole of the base 101 by defining the installation position of the third chamfer, so as to prevent the hanger assembly 102 from being pushed out of the well due to excessive pressure in the well. In addition, since the third chamfer structure and the first chamfer structure are respectively arranged at two opposite ends of the hanger body 1021, the third chamfer structure and the first chamfer structure can respectively apply forces in opposite directions to the hanger body 1021, so that the hanger body 1021 can be stably fixed inside the through hole of the base 101 under the joint action of the third chamfer structure and the first chamfer structure.

[0052] Optionally, please continue to refer to Figure 3 A top screw installation hole may be provided on the base 101, and the top screw assembly 104 may include: a top screw 1041 and a top screw pressure cap 1042. An internal thread is provided on the inner surface of the top screw pressure cap 1042, and an external thread is provided on the outer surface of the top screw pressure cap 1042. The top screw pressure cap 1042 may be fixedly connected to the top screw 1041 via the internal thread, and the top screw pressure cap 1042 may be fixedly connected to the top screw assembly installation hole via the external thread. Furthermore, the top screw 1041 may be rotated to change the position of the top screw 1041 in the top screw installation hole, so as to realize the ejection and retraction of the top screw, so as to change the magnitude of the force applied by the top screw 1041 to the third chamfered structure.

[0053] It should be noted that at least one top screw assembly 104 may be provided at the position where the base contacts the third chamfer structure. When multiple top screw assemblies 104 are provided, the multiple top screw assemblies 104 may jointly generate a force on the third chamfer structure to control the installation position of the hanger assembly 102, thereby enhancing the control capability of the top screw 1041 on the installation position of the hanger assembly 102. Furthermore, when the multiple top screw assemblies 104 are evenly provided on the base, the uniformity of the force of the top screw assembly 104 on the hanger assembly 102 can be improved, so as to further enhance the control capability of the top screw 1041 on the position of the hanger assembly 102.

[0054] In an achievable manner, the wellhead sealing device may further include: a second sealing component ( Figure 3(not shown in the figure), the second sealing component can be arranged between the top screw installation hole and the top screw 1041, so that the base 101 and the top screw 1041 can be sealed to prevent the liquid in the well from leaking from the top screw installation hole. Optionally, a sealing groove can be arranged between the top screw 1041 and the top screw installation hole, and the second sealing component can be a top screw packing, which can be arranged in the sealing groove to achieve sealing between the top screw component 104 and the top screw installation hole.

[0055] Furthermore, the top screw assembly 104 and the first chamfered structure can be respectively arranged at the top and bottom of the wellhead sealing device. For example, when the wellhead sealing device is arranged at the wellhead, the top screw assembly 104 and the first chamfered structure can be arranged in sequence along the well depth direction. At this time, the top screw assembly 104 is located at the upper end of the first chamfered structure. When the liquid level in the well exceeds the height of the first chamfered structure, and the liquid level does not exceed the height of the top screw assembly 104, since there is no gap between the first chamfered structure and the base, there is no possibility of liquid leaking through the base. Therefore, when the top screw assembly 104 and the first chamfered structure can be respectively arranged at the top and bottom of the wellhead sealing device, the probability of liquid in the casing annulus leaking from the top screw installation hole can be further reduced, thereby improving the sealing performance of the wellhead sealing device.

[0056] To summarize, the wellhead sealing device provided in the embodiment of the present invention has a base sealedly connected to the wellhead, and a deformable sealing component fixedly arranged between the hanger assembly and the base, so that the cable can pass through the second through groove of the deformable sealing component, and when the cable passes through the second through groove, the deformable sealing component can be squeezed by the protruding structure and the support ring to ensure the sealing between the cable and the deformable sealing component, and then the wellhead is sealed through the base, the hanger assembly and the deformable sealing component embedded with the cable. Compared with the related art, the problem of being unable to seal the well during construction breaks can be solved, the probability of leakage of materials in the well is reduced, and the potential safety hazards of well control in water injection wells during construction breaks are reduced.

[0057] Furthermore, since the wellhead sealing device reduces the potential safety hazard of well control during the intermittent phase of water injection well construction, the use of the wellhead sealing device can be conducive to the large-scale promotion of the cabled intelligent stratified water injection technology, making the cabled intelligent stratified water injection technology have a wider application prospect.

[0058] The embodiment of the present invention further provides a well sealing method, which can be applied to the wellhead sealing device provided in the above embodiment, such as Figure 6 As shown, the method may include:

[0059] Step 201: sealingly connect the base of the wellhead sealing device to the wellhead to be sealed.

[0060] For example, the base may be connected to the wellhead of the well to be sealed via a flange to achieve a sealed connection between the wellhead and the base.

[0061] Step 202: sleeve the deformable sealing assembly onto the hanger body.

[0062] Step 203: embed the cable inside the well to be sealed into the second through groove of the deformable sealing component.

[0063] For example, a second through groove is provided on the deformable sealing component, and the groove body of the second through groove contacts the base. When the deformable sealing component is set in the through hole of the base, the cable can be embedded into the second through groove from the side of the deformable sealing component close to the base.

[0064] Step 204: sequentially sleeve the support ring and the limit ring onto the hanger body.

[0065] The limiting ring and the hanger body can be connected by threads. For example, the support ring and the limiting ring can be sleeved on the hanger body in sequence, and the limiting ring can be moved to a preset position of the hanger body by rotating the limiting ring, and the limiting ring can be fixed on the hanger body.

[0066] Step 205: Fixedly connect the oil pipe inside the well to be sealed to the hanger body.

[0067] For example, the oil pipe inside the well to be sealed can be fixedly connected to the hanger assembly by threaded connection.

[0068] Step 206: fix the hanger assembly inside the through hole of the base.

[0069] For example, after completing the connection of the various components in the hanger assembly, the hanger assembly can be placed on the first chamfer, and the top screw can be rotated to push the top screw out, so as to control the installation position of the third chamfer by the top screw, and then fix the hanger assembly inside the through hole of the base, so that the hanger assembly seat is hung in the through hole of the base.

[0070] Step 207: fix the well plugging device on the hanger assembly.

[0071] For example, the well plugging device can be connected to the hanger assembly to seal the oil pipe. For example, the well plugging device can be connected to the hanger assembly through a plug valve.

[0072] To sum up, the well sealing method provided by the embodiment of the present invention, by sealingly connecting the base of the wellhead sealing device to the wellhead to be sealed, and fixing the deformable sealing component between the hanger component and the base, can allow the cable to pass through the second through groove of the deformable sealing component, and when the cable passes through the second through groove, the deformable sealing component can be squeezed by the protruding structure and the support ring to ensure the sealing between the cable and the deformable sealing component, and then the wellhead can be sealed by the base, the hanger component and the deformable sealing component embedded with the cable. Compared with the related art, the problem of being unable to seal the well during construction breaks can be solved, the probability of leakage of materials in the well is reduced, and the potential safety hazards of well control in water injection wells during construction breaks are reduced.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A wellhead sealing device, characterized in that: The device comprises: a base, a hanger assembly and a deformable sealing assembly; The base is used for sealing connection with the wellhead, the base is provided with a through hole, and a first chamfered structure is provided on the surface of the through hole; The hanger assembly is fixedly arranged inside the through hole, and is used to seal the oil pipe in the well. The hanger assembly comprises: a hanger body and a support ring sleeved on the hanger body, and the hanger body has a convex structure, and the support ring is provided with a first through groove; The deformable sealing component is fixedly arranged between the hanger component and the base, and the deformable sealing component is sleeved in the area defined by the protruding structure and the support ring, and a second through groove is arranged on the deformable sealing component, and the second through groove is communicated with the first through groove for allowing the cable to pass through; Wherein, a second chamfered structure is provided at one end of the support ring away from the deformable sealing assembly, and the second chamfered structure is used to engage with the first chamfered structure, and the base, the hanger assembly and the deformable sealing assembly embedded with the cable are used to seal the wellhead; The protruding structure is provided with a third through slot, which is communicated with the second through slot and is used for allowing the cable to pass through.

2. The device according to claim 1, characterized in that At least one of the first end face and the second end face of the deformable sealing component is inlaid with a washer, the first end face is the end face of the deformable sealing component used to contact the protruding structure, and the second end face is the end face of the deformable sealing component used to contact the support ring.

3. The device according to claim 1, characterized in that The groove body of the second through groove is in contact with the base.

4. The device according to claim 3, characterized in that The groove body of the second through groove includes: a sub-groove body arranged inside the deformable sealing component and cutouts arranged on both sides of the sub-groove body and penetrating the deformable sealing component.

5. The device according to any one of claims 1 to 4, characterized in that: The hanger assembly further comprises: a limit ring sleeved on the hanger body, the limit ring being arranged on a side of the support ring away from the deformable sealing assembly, and the limit ring being used to limit the installation position of the deformable sealing assembly and the support ring.

6. The device according to claim 5, characterized in that The orthographic projection of the limiting ring on the outlet surface of the through hole does not overlap with the orthographic projection of the second through groove on the outlet surface of the through hole.

7. The device according to any one of claims 1 to 4, characterized in that: A third chamfered structure is provided at one end of the protruding structure away from the deformable sealing component; The device further comprises: a jackscrew assembly, the jackscrew assembly is movably connected to the base, and the jackscrew assembly is used to define the installation position of the third chamfered structure.

8. The device according to claim 7, characterized in that The base is provided with a jack screw installation hole, the jack screw assembly includes a jack screw, and the device further includes a second sealing assembly, which is arranged between the jack screw installation hole and the jack screw.

9. The device according to claim 7, characterized in that The top screw assembly and the first chamfer structure are respectively arranged at the top end and the bottom end of the wellhead sealing device.

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