Casing suspension device suitable for high-temperature and high-pressure well

Abstract

The utility model relates to a casing suspension device suitable for a high-temperature and high-pressure well, which comprises a pulling-out part and a well leaving part, and a pulling-out sealing mechanism of the pulling-out part arranged between a central pipe and a back-off jacket mainly comprises a sealing pressing cap and a sealing body, a sealing pressing cap provided with a second sealing ring, a third sealing ring and a two-way sealing ring is connected with a sealing body, and the sealing body is installed in the inner wall of the back-off outer sleeve. The size of the lower end of the sealing body exposed between the central pipe and the back-off jacket is smaller than the outer diameter of a coupling connected to the lower end of the central pipe; and a sealing element arranged outside a sealing sleeve of a well-leaving packing mechanism in the well-leaving part is a multi-combination sealing element. According to the device, the sealing performance between the pulling-out part and the well leaving part and the sealing performance of the well leaving part can be ensured, leakage caused by sealing failure is prevented, the steam injection effect is improved, the service life of a well leaving pipe column is prolonged, meanwhile, the well completion quality and operation safety are improved, and therefore the development efficiency of a high-temperature and high-pressure well is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the downhole casing hanger for oil and gas field completion, especially a casing hanger suitable for high temperature and high pressure well. BACKGROUND

[0002] In the heavy oil thermal recovery sidetracking well, the steam injection often causes the temperature in the well to exceed 300 DEG C, which makes the sealing performance of the casing hanger in the well face severe test, and the high temperature working environment can cause the traditional rubber sealing element or composite material sealing element in the hanger to soften, age, and even lose the sealing ability.

[0003] In addition, under high temperature and high pressure environment, the traditional sealing element cannot withstand long-term pressure difference change, which is easy to cause leakage, affecting the safety and stability of downhole operation.

[0004] The above problems can cause workover operation and pay huge workover construction cost.

[0005] At the same time, under the high temperature and high pressure environment of heavy oil thermal recovery steam injection, higher requirements are put forward for the mechanical strength and stability of the hanger. In summary, under the above extreme working conditions, the existing casing hanger is prone to sealing failure, unstable suspension, deformation or damage of sealing parts, and other problems, which seriously affect the safety and construction efficiency of sidetracking completion technology.

[0006] In order to solve the sealing problem of the hanger, the following related technologies have appeared: a high temperature resistant metal sealing hanger disclosed in Chinese patent authorized publication No. CN217151896U is mainly used to solve the problems of liner hanger and sealing under high temperature working condition. The invention creates a sealing ball made of metal and a special hydraulic and mechanical release double insurance mechanism, which successfully improves the safety and reliability of the hanger in heavy oil thermal recovery well, and effectively solves the problem of sand production in high temperature well.

[0007] However, the deficiency of the above invention is that its sealing structure still relies on the traditional sealing method, and the sealing element will have performance attenuation under long time high temperature environment, resulting in sealing failure. In addition, the above device still needs to be accurately positioned during installation, which is complex to operate, increases the installation difficulty and time cost.

[0008] A high temperature and high pressure resistant metal sealing element disclosed in Chinese patent application No. 202410524821.9 aims to improve the sealing performance of downhole packer under high temperature and high pressure conditions. The invention adopts the design of metal inner and outer cylinder and filling powder material, which greatly improves the high temperature and high pressure resistance and repeated use ability of the sealing element, and can realize reliable sealing in high pressure environment.

[0009] However, the design of the above invention focuses on the material and structural improvement of the sealing element itself, without considering the integrated application with the casing hanger device. The sealing element may not be fully compatible with the structure of the existing hanger in actual application, resulting in increased complexity of installation and operation, and reducing construction efficiency.

[0010] The problem of easy failure of the sealing component in the hanger device still needs to be solved. SUMMARY

[0011] The utility model aims at providing a casing hanger device suitable for high temperature and high pressure well, overcomes the problem that the sealing component in the existing casing hanger device cannot bear the differential pressure change for a long time under high temperature and high pressure environment, resulting in unreliable sealing and leakage, affecting the safety and stability of downhole operation. The working reliability of the casing hanger device in the well is improved, the service life of the device is prolonged, the production cost is reduced, and the economic benefit is improved.

[0012] The technical solution of the utility model is: a casing hanger device suitable for high temperature and high pressure well, comprising a tripping-out part and a well-remaining part, the tripping-out part is connected with the reverse-buckle outer sleeve in the well-remaining part through a reverse-buckle sleeve, and the tripping-in part and the well-remaining part are lowered into the well together with the tripping-in string, wherein: the tripping-out sealing mechanism of the tripping-out part installed between the central pipe and the reverse-buckle outer sleeve mainly comprises a sealing pressure cap and a sealing body, the sealing pressure cap connected with the sealing body is provided with sealing ring two, sealing ring three and a bidirectional sealing ring, and the sealing body is installed in the inner wall of the reverse-buckle outer sleeve; the size of the lower end of the sealing body exposed between the central pipe and the reverse-buckle outer sleeve is less than the outer diameter of the coupling connected with the lower end of the central pipe; the sealing element installed outside the sealing sleeve of the well-remaining part is a multiple combination sealing element.

[0013] Preferably, the bidirectional sealing ring is a W-shaped sealing ring.

[0014] Preferably, the outer diameter of the sealing pressure cap is large at the top and small at the bottom, and the outer diameter of the lower part is provided with external threads connected with the internal threads of the upper internal cavity of the sealing body; the sealing ring two and the sealing ring three are installed in the outer circle and the inner circle of the upper body of the sealing pressure cap, and the bidirectional sealing ring is installed in the lower inner circle of the sealing pressure cap.

[0015] Preferably, the sealing body is also provided with a positioning block and a locking shaft, the middle part of the sealing body is provided with a positioning block installation groove and a locking shaft installation hole; the locking shaft installation hole is also arranged in the positioning block, and the locking shaft passes through the locking shaft installation hole and the positioning block, installs the positioning block in the positioning block installation groove and blocks the locking shaft installation hole below.

[0016] Preferably, the positioning block is a block-shaped body with arc-shaped structures on the inner and outer sides and chamfered upper and lower ends; the arc-shaped structure on the inner side of the positioning block corresponds to the central tube, and the arc-shaped structure on the outer side of the positioning block corresponds to the assembly groove on the inner wall of the reverse-threaded outer sleeve.

[0017] Preferably, a threaded hole with a larger diameter than the upper hole is arranged at the lower part of the locking shaft mounting hole below the sealing body, and a locking pin is arranged in the threaded hole. 。

[0018] Preferably, the diameter of the central hole of the sealing body corresponds to the outer diameter of the central tube, and the outer circle of the lower end of the sealing body is chamfered and cooperates with the structure of the sealing body limiting step arranged in the reverse-threaded outer sleeve.

[0019] Preferably, the sealing member arranged on the outer surface of the sealing sleeve in the remaining well part is a multiple combination sealing member mainly composed of a polyether ether ketone layer, a red copper layer, a 306 stainless steel layer and a 321 stainless steel layer, and is vulcanized in layers from the inside to the outside.

[0020] Preferably, a bearing is further arranged in the reverse-threaded dropping hand structure of the pulling-out part, and the bearing is arranged above the supporting seat between the middle connecting sleeve of the pulling-out part and the lower connecting sleeve of the reverse-threaded dropping hand structure.

[0021] Preferably, a righting spring is further arranged between the lower inner cavity of the supporting seat and the reverse-threaded sleeve, and the outer diameter of the reverse-threaded sleeve is smaller than the lower inner cavity of the supporting seat; when the reverse-threaded sleeve is threadedly connected with the reverse-threaded outer sleeve, the reverse-threaded sleeve can move up and down below the righting spring in the lower inner cavity of the supporting seat.

[0022] Compared with the existing casing hanger of a high-temperature and high-pressure well, the utility model has the following remarkable use effects: 1. The utility model solves the defects of insufficient work reliability of the sealing components in the pulling-out part and the remaining well part, uses multiple sealing rings and a W-shaped bidirectional sealing member in the pulling-out part, and uses a multiple combination sealing member with a large deformation rate, good ductility and excellent mechanical properties on the outer surface of the lower sealing sleeve in the remaining well part. The multiple combination sealing member is mainly composed of a polyether ether ketone layer, a red copper layer, a 306 stainless steel layer and a 321 stainless steel layer, and is vulcanized in layers from the inside to the outside, thereby avoiding the leakage and adverse effects on the safety and stability of downhole operation caused by the fact that the sealing components in the existing hanger cannot withstand long-term pressure difference changes in a high-temperature and high-pressure environment, and solving the problem of aging, damage and failure of rubber sealing members under high-temperature steam injection conditions.

[0023] 2、Compared with the traditional O-shaped rubber ring, the bidirectional sealing element provides reliable bidirectional sealing function in the case of pipe string activity, can prevent solid particles such as sand and mud in the well from entering the device, and ensures the sealing effect of the hanging device in the running, setting and back-off. In addition, in the special working conditions such as failure of the running and setting of the hanging device, it also has the re-entry property, which can meet the sealing demand of multiple uses.

[0024] 3、Overcomes the defects that the existing casing hanging device needs to be accurately aligned with the neutral point when installing and connecting the pulled-out part and the well-remaining part and back-off, which can complete the installation and connection and back-off. Greatly facilitates the operation during installation and connection and significantly reduces the operation frequency and time cost of back-off in the high temperature and high pressure environment in the well. Especially in the complex environment of high temperature and high pressure in the well, the precise back-off requirement of the existing hanging device may cause multiple adjustments and back-off failures during construction. However, by using the utility model, under the action of the centralizing spring in the bearing and the supporting seat, the back-off release mechanism rotates freely, the back-off sleeve has a certain space for movement, and the back-off release operation of the pulled-out part can be completed without accurate alignment with the neutral point, which effectively overcomes all adverse consequences caused by the above defects; significantly reduces the construction cost and significantly improves the construction efficiency and reduces the production cost.

[0025] The utility model is mainly applied to the sidetracking well of heavy oil thermal recovery, especially in the high temperature steam injection working condition, the device can effectively solve the problems of cement ring damage at the horn position on the upper end of the lower sealing sleeve in the hanging device and sealing failure of conventional rubber material caused by steam injection high temperature, can ensure the sealing performance of the well-remaining part or the well-remaining pipe column, prevent leakage after sealing failure, improve steam injection effect and service life of the well-remaining pipe column, and improve completion quality and operation safety, so that the development efficiency of the heavy oil thermal recovery well is greatly improved.

[0026] In summary, the utility model not only has good sealing performance, but also is convenient to construct, and has remarkable use effect and application value. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings are used to provide further understanding of the utility model and constitute a part of the specification, are used to explain the utility model together with embodiments of the utility model, and do not constitute limitation to the utility model. In the drawings:

[0028] Figure 1 It is the structure schematic view of the utility model.

[0029] Figure 2 It is Figure 1 The front view and the structure schematic view of A-A direction in the front view of the sealing body.

[0030] Figure 3 It is Figure 1Structure schematic view of the front view and the left view of the positioning block.

[0031] In the figure: lifting short section 1, stabilizing nail 2, sieve cap 3, outer sleeve 4, upper connecting sleeve 5, rubber ring 1 6, claw sleeve 7, lower pressing claw 8, stabilizing nail 2, supporting spring 10, middle connecting sleeve 11, bearing 12, supporting seat 13, righting spring 14, lower connecting sleeve 15, reverse threaded sleeve 16, sealing ring 1 17, reverse threaded sleeve 18, sealing ring 2 19, sealing ring 3 20, sealing pressure cap 21, bidirectional sealing ring 22, sealing body 23, positioning block 24, locking shaft 25, locking nail 26, central pipe 27, sealing inner sleeve 28, upper connecting ring 29, upper sealing sleeve 30, sealing sleeve 31, sealing element 32, sitting hanging sleeve 33, outer connecting sleeve 34, slip 35, stabilizing nail 36, push rod 37, lower connecting ring 38, piston outer sleeve 39, rubber ring 2 40, rubber ring 3 41, shear nail 42; righting body 43, coupling 44. DETAILED DESCRIPTION

[0032] The accompanying drawings are only used for reference and illustration, and are not used to limit the protection scope of the utility model. The technical solutions in the embodiments of the utility model will be clearly and completely described below by combining the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0033] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the utility model will be further described in detail below by combining the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0034] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, in the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0035] Reference Figure 1 - Figure 3The utility model provides a casing hanger device for high temperature and high pressure well, including the part of pulling out and the part of leaving well, the part of pulling out is connected with the part of leaving well through the reverse screw sleeve 16 and the reverse sleeve 18 in the part of leaving well, and the part of sending in and the part of leaving well are lowered into the well together with the pipe string, wherein: the sealing mechanism of the part of pulling out installed between the central tube 27 and the reverse sleeve 18 is mainly composed of sealing pressure cap 21 and sealing body 23, the sealing pressure cap 21 equipped with sealing ring two 19 and sealing ring three 20 and bidirectional sealing ring 22 is connected with the sealing body 23, and the sealing body 23 is installed in the inner wall of the reverse sleeve 18, the size of the lower end of the sealing body 23 exposed between the central tube 27 and the reverse sleeve 18 is less than the outer diameter of the coupling 44 connected to the lower end of the central tube 27, and the sealing element 32 installed outside the sealing sleeve 31 of the sealing mechanism in the part of leaving well is multiple combination sealing element.

[0036] The utility model has improved and optimized the structure of the sealing mechanism of the part of pulling out, the sealing component in the part of leaving well and the sealing element 32 in the part of leaving well.

[0037] The sealing body 23 in the utility model is connected between the central tube 27 and the reverse sleeve 18.

[0038] Because the outer diameter of the coupling 44 is greater than the size of the sealing body 23 between the central tube 27 and the reverse sleeve 18, when the part of pulling out is pulled out from the part of leaving well, the sealing mechanism can be pulled out from the well, and the operation is convenient.

[0039] On the basis of the above embodiment one, the utility model also has the following embodiments: preferably, the bidirectional sealing ring 22 is a W-shaped sealing ring.

[0040] Preferably, the outer diameter of the sealing pressure cap 21 is large at the top and small at the bottom, and the outer diameter of the lower part is provided with external threads and connected with the internal threads of the upper inner cavity of the sealing body 23.

[0041] A preferred embodiment: the sealing body 23 is also provided with a positioning block 24 and a locking shaft 25, the middle part of the sealing body 23 is provided with a positioning block mounting groove and a locking shaft mounting hole; the positioning block 24 is also provided with a locking shaft mounting hole, the locking shaft 25 passes through the locking shaft mounting hole and the positioning block 24, installs the positioning block 24 in the positioning block mounting groove and blocks the locking shaft mounting hole below, which can be blocked by glue or bolts.

[0042] A preferred embodiment: the positioning block 24 is a block-shaped body with arc-shaped structures on the inner and outer sides and chamfers on the upper and lower ends; the arc-shaped structure on the inner side of the positioning block 24 corresponds to the central tube 27, and the arc-shaped structure on the outer side of the positioning block 24 corresponds to the assembly groove on the inner wall of the inverted sleeve 18. The chamfers on the upper and lower ends of the positioning block 24 can smoothly pull out the sealing body 23.

[0043] A preferred embodiment: the lower part of the locking shaft mounting hole below the sealing body 23 is provided with a threaded hole with a larger diameter than the upper hole, and a locking pin 26 is installed in the threaded hole, which can fix the positioning block 24 and the locking shaft 25 in the sealing body 23, and can further ensure the installation firmness of the locking shaft 25 and the sealing body 23 and protect the installation firmness of the pulling-out sealing mechanism. In the sealing body 23, more than two positioning blocks 24 are installed, Figure 2 and Figure 3 four positioning blocks 24 are installed in the sealing body 23. 。

[0044] A preferred embodiment: the diameter of the central hole of the sealing body 23 corresponds to the outer diameter of the central tube 27, and the outer circle of the lower end of the sealing body 23 is provided with a chamfer and cooperates with the structure of the sealing body limiting step arranged in the inverted sleeve 18.

[0045] A preferred embodiment: the sealing element 32 installed on the outside of the sealing sleeve 31 in the wellhead part is a multiple combination sealing element mainly composed of a polyether ether ketone layer, a red copper layer, a 306 stainless steel layer and a 321 stainless steel layer, and is vulcanized from the inside to the outside. The sealing element 32 made by layering and vulcanizing replaces the traditional rubber sealing element, and when the downhole string is pressed into the wellbore, the sealing element 32 can be reliably set by expanding through the wedge-shaped metal cone compression of the lower part of the outer circle of the upper sealing sleeve 30 above the sealing sleeve 31, which seals the annulus between the wellhead part and the wellbore. The sealing performance and isolation effect between the suspension device and the wellbore under the condition of high temperature above 300℃ are improved, the aging, damage and failure of the rubber sealing part under the condition of high temperature steam injection are solved, and the service life of the wellhead part is improved.

[0046] A preferred embodiment: the reverse buckle lost tool structure in the said lifting-out part is also provided with a bearing 12, which is installed above the supporting seat 13 between the middle connecting sleeve 11 of the lifting-out part and the lower connecting sleeve 15 of the reverse buckle lost tool structure. The rotation of the reverse buckle lost tool structure connected below is flexible and smooth.

[0047] A preferred embodiment: the reverse buckle lost tool structure in the said lifting-out part is also provided with a bearing 12, which is installed above the supporting seat 13 between the middle connecting sleeve 11 of the lifting-out part and the lower connecting sleeve 15 of the reverse buckle lost tool structure. The rotation of the reverse buckle lost tool structure connected below is flexible and smooth.

[0048] The reverse buckle sealing mechanism, the reverse buckle lost tool structure and the lifting-out sealing mechanism of the lifting-out part in the utility model are sequentially connected from top to bottom through the lifting short section 1, the upper connecting sleeve 5, the middle connecting sleeve 11 and the central pipe 27; the well-remaining sealing mechanism and the well-remaining supporting mechanism in the well-remaining part are connected through the sitting hanging sleeve 33.

[0049] The reverse buckle sealing mechanism of the lifting-out part is provided with the upper connecting sleeve 5, the claw sleeve 7, the pressing claw 8 and the supporting spring 10; the lifting short section 1 is sequentially threadedly connected with the upper connecting sleeve 5 and the middle connecting sleeve 11, and the rubber ring 1 is installed between the lifting short section 1 and the upper connecting sleeve 5; the steady nail 2 with the supporting spring 10 installed outside is installed in the steady nail hole of the pressing claw 8; the claw sleeve 7 is threadedly connected with the upper connecting sleeve 5; the pressing claw 8 is installed below the claw sleeve 7 and the upper part and the middle part of the pressing claw 8 are connected with the upper connecting sleeve 5 through the thread and the steady nail 2 respectively.

[0050] The middle connecting sleeve 11 is connected between the upper connecting sleeve 5 and the lower connecting sleeve 15 in the reverse buckle lost tool structure; the outer surface of the lower connecting sleeve 15 is connected with the bearing 12, the supporting seat 13 provided with the righting spring 14 and the reverse buckle sleeve 16 which can be threadedly connected with the reverse buckle outer sleeve 18 from top to bottom.

[0051] The lower part of the lower connecting sleeve 15 is connected with the central pipe 27 and the lifting-out sealing mechanism is connected between the reverse buckle outer sleeve 18 and the central pipe 27 through the central pipe 27; the lower end of the central pipe 27 is connected with the coupling 44, and the pipe column can be lifted and sent into the coupling 44 to lift the lifting-out part from the well-remaining part.

[0052] The well-keeping sealing mechanism in the well-keeping part is further provided with an outer sleeve 4 and a sealing inner sleeve 28. The outer sleeve 4 is connected with the reverse-threaded sleeve 18 provided with the sealing ring 17 and the sealing inner sleeve 28 in sequence from top to bottom, and is connected with the setting sleeve 33 and the well-keeping supporting mechanism through the sealing inner sleeve 28. An upper connecting ring 29 is arranged between the outer sleeve 4 and the sealing inner sleeve 28. An upper sealing sleeve 30 connected with the upper connecting ring 29 and a sealing sleeve 31 provided with a sealing element 32 are arranged outside the sealing inner sleeve 28.

[0053] In the well-keeping supporting mechanism, an outer connecting sleeve 34 connected with a centralizer 43 is arranged below the setting sleeve 33. A slip 35, a push rod 37 provided with a stabilizing pin 36, a lower connecting ring 38, a piston outer sleeve 39 and the centralizer 43 are arranged outside the outer connecting sleeve 34 and between the setting sleeve 33 and the centralizer 43. The piston outer sleeve 39 is connected with the outer connecting sleeve 34 through a shear pin 42. The outer connecting sleeve 34 is provided with a liquid inlet hole, and the upper body of the piston outer sleeve 39 is provided with a rubber ring 40 and a rubber ring 41.

[0054] A screen cap 3 is arranged between the lifting sub 1 and the outer sleeve 4, and the screen cap 3 is connected with the lifting sub 1 through a stabilizing pin 1.

[0055] When the device is used to perform downhole operation, a running string is connected with the lifting sub 1, and the reverse-threaded sleeve 16 in the tripping-out part is threadedly connected with the reverse-threaded outer sleeve 18 in the well-keeping part. The running part and the well-keeping part of the device are lowered into the well through the running string.

[0056] When the device is lowered to a preset position in the well according to the operation requirement, the lower outer thread of the outer connecting sleeve 34 in the well-keeping part is threadedly connected with a tailpipe string provided with a ball seat and a rubber plug contact pressure seat at the bottom. Hydraulic pressure is injected into the lifting sub 1 and the tripping-out part. High-pressure liquid enters the body of the piston outer sleeve 39 through the liquid inlet hole of the central pipe 27 and the liquid inlet hole of the outer connecting sleeve 34. Under the action of the hydraulic pressure, the piston outer sleeve 39 pushes the push rod 37 and the slip 35 to move upward along the lower conical surface of the setting sleeve 33, and the slip 35 is supported in the wellbore, thereby completing the setting and sealing of the well-keeping part. The ball seat arranged at the lower end of the tailpipe string provides a closed space for the setting and sealing of the device, and the contact pressure seat provides contact pressure and locking for the cement plug.

[0057] The reverse-threaded sleeve 16 in the tripping-out part is separated from the reverse-threaded outer sleeve 18 in the well-keeping part by rotating the running string on the ground, so that the well-keeping part is left in the well, and the tripping-out part is pulled out of the well.

[0058] The above-described embodiments are merely typical embodiments, but the utility model is not limited to these embodiments, and a person skilled in the art can make modifications without deviating from the spirit and inspiration of the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, a person skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to part of the technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and concept of the utility model should be included in the protection scope of the utility model. Therefore, the protection scope is not limited to the foregoing description.

Claims

1. A casing hanger suitable for use in high temperature and high pressure wells, comprising a pull-out section and a well-remaining section, the pull-out section being connected to a reverse-shouldered casing in the well-remaining section by a reverse-shouldered sleeve, the pull-out section and the well-remaining section being run into the well together with a running string, characterized in that, The running-out sealing mechanism of the running-out part installed between the central pipe and the reverse-threaded outer sleeve mainly consists of a sealing pressure cap and a sealing body, the sealing pressure cap is connected with the sealing body and is provided with sealing ring two, sealing ring three and a bidirectional sealing ring, and the sealing body is installed in the inner wall of the reverse-threaded outer sleeve; the lower end of the sealing body is exposed between the central pipe and the reverse-threaded outer sleeve and has a size smaller than the outer diameter of the coupling connected to the lower end of the central pipe; the sealing member installed outside the sealing sleeve of the well-remaining part is a multiple combination sealing member.

2. A casing hanger system for use in high temperature, high pressure wells as defined in claim 1, wherein, The bidirectional sealing ring is a W-shaped sealing ring.

3. A casing hanger system for use in high temperature, high pressure wells as defined in claim 2, wherein: The outer diameter of the sealing pressure cap is large at the upper part and small at the lower part, and the lower part is provided with external threads connected with the internal threads of the upper inner cavity of the sealing body; the sealing ring two and the sealing ring three are installed in the outer circle and the inner circle of the upper body of the sealing pressure cap, and the bidirectional sealing ring is installed in the lower inner circle of the sealing pressure cap.

4. A casing hanger system for use in high temperature, high pressure wells as defined in claim 3, wherein: The sealing body is further provided with a positioning block and a locking shaft, the middle part of the sealing body is provided with a positioning block installation groove and a locking shaft installation hole; the positioning block is also provided with a locking shaft installation hole, the locking shaft passes through the locking shaft installation hole and the positioning block, installs the positioning block in the positioning block installation groove and blocks the locking shaft installation hole below.

5. A casing hanger system for use in a high temperature, high pressure well as defined in claim 4, wherein: The positioning block is a block-shaped body with arc structures at the inner and outer sides and chamfered upper and lower ends; the arc structure at the inner side of the positioning block corresponds to the central pipe, and the arc structure at the outer side of the positioning block corresponds to the assembly groove of the inner wall of the reverse-threaded outer sleeve.

6. A casing hanger system for use in high temperature, high pressure wells as defined in claim 5, wherein the The lower part of the locking shaft mounting hole below the seal body is provided with a threaded hole with a larger diameter than the upper hole, and a locking pin is installed in the threaded hole 。 7. A casing hanger system for use in high temperature, high pressure wells as defined in claim 5, wherein, The hole diameter of the central hole of the sealing body corresponds to the outer diameter of the central pipe, and the outer circle of the lower end of the sealing body is provided with a chamfer and cooperates with the structure of the sealing body limiting step arranged in the reverse-threaded outer sleeve.

8. A casing hanger system for use in high temperature, high pressure wells as defined in claim 1, wherein, The sealing member installed outside the sealing sleeve in the well-remaining part is a multiple combination sealing member and mainly consists of a polyether ether ketone layer, a red copper layer, a 306 stainless steel layer and a 321 stainless steel layer, which are laminated and vulcanized from the inside to the outside.

9. A casing hanger system for use in high temperature, high pressure wells as defined in claim 1 wherein the The reverse-threaded dropping mechanism of the running-out part is further provided with a bearing, which is installed above the bearing seat between the middle connecting sleeve of the running-out part and the lower connecting sleeve of the reverse-threaded dropping mechanism.

10. A casing hanger system for use in high temperature, high pressure wells as defined in claim 9, wherein the A righting spring is further installed between the lower inner cavity of the bearing seat and the reverse-threaded screw sleeve, and the outer diameter of the reverse-threaded screw sleeve is smaller than the lower inner cavity of the bearing seat; when the reverse-threaded screw sleeve is threadedly connected with the reverse-threaded outer sleeve, the reverse-threaded screw sleeve can move up and down below the righting spring in the lower inner cavity of the bearing seat.

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