Adjustable casing head fixture with carrier

Abstract

The application discloses a casing head fixing device with a bearing seat and relates to the technical field of wellheads. The device comprises a seat body fixed to the top end of a guide pipe, the seat body is internally provided with a guide structure extending along the axial direction, a bearing block is slidably arranged in the guide structure, the top inner side of the bearing block is provided with a first bearing surface inclined relative to the axial direction, the upper end surface of the bearing block is provided with a threaded hole, an adjusting member penetrates through the top of the seat body and is in transmission connection with the bearing block, and a suspension member is arranged in the inner cavity of the seat body, the bottom outer side of the suspension member is provided with a second bearing surface parallel to the first bearing surface, the first bearing surface and the second bearing surface are matched, and the inner side of the suspension member is locked with the casing. The device guides the vertical load of the casing into the guide pipe through the suspension member, the bearing block, the adjusting member and the seat body, so that the suspension and fixation of the casing are not dependent on the cementing quality of the casing cement sheath, the axial displacement of the bearing block is realized by rotating the adjusting member to compensate for the deviation of the hanging position caused by the residual over-tension of well cementing, and the precision adjustment and long-term stable fixation of the casing suspension are realized.

Description

Technical Field

[0001] This invention relates to the field of drilling wellhead technology, and in particular to an adjustable casing head fixing device with a bearing seat. Background Technology

[0002] In oil and gas drilling, the surface casing is the first casing string run into the wellbore. Its main functions are to reinforce shallow, soft formations, isolate shallow water layers, fix the wellhead, and provide foundation support for subsequent deeper casing runs and drilling operations. After the surface casing is run, cementing is performed by injecting cement slurry into the annulus between the casing and the wellbore, bonding the casing to the formation. After cementing, the top of the surface casing is connected to the upper blowout preventer assembly, Christmas tree, and other wellhead equipment via the casing head, thus forming a complete wellhead equipment system.

[0003] However, existing casing heads are essentially just centering connectors, lacking their own ground anchoring points. The entire weight of the surface casing and the additional loads generated by formation deformation rely on the bonding force between the cement sheath and the formation. Affected by factors such as fluctuations in the cement slurry system's performance, non-uniform release of formation stress, and cyclical changes in downhole temperature, the bonding integrity of the cement sheath inevitably decays gradually over long-term service, leading to vertical settlement and radial displacement of the surface casing. This, in turn, triggers a series of chain failures, including overall wellhead tilting, blowout preventer (BOP) sealing surface eccentricity, and drill string wear. Furthermore, after cementing operations, tens of tons of elastic overstress often remain within the casing string. Existing casing heads lack any means to release or compensate for this residual stress, causing the actual mounting position of the hanger slips to deviate from the design position by several millimeters, leading to potential safety hazards such as false jamming, uneven loading, and even slippage. Due to the lack of a rigid mechanical force transmission path independent of the cement sheath and methods for adjusting residual stress after cementing, the reliability and long-term stability of existing surface casing fixing structures are significantly insufficient under complex cementing conditions. . Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is that the existing surface casing fixing structure lacks a mechanical force transmission path independent of the cement sheath, the casing is prone to sinking and displacement after cementing, and it cannot compensate for the problem of the hanger not being properly seated due to residual over-tension in cementing.

[0005] The above-mentioned technical problems are solved by the following technical solutions: An adjustable sleeve head fixing device with a support base includes a base body, a support block, an adjusting component, and a suspension component.

[0006] In a preferred embodiment of the adjustable sleeve head fixing device with bearing seat described in this invention: the seat body is fixed to the top end of the conduit, and the seat body is provided with a guide structure extending axially. A support block is slidably disposed within the guide structure. The inner top side of the support block is provided with a first support surface that is inclined relative to the axial direction, and the upper end face of the support block is provided with a screw hole. An adjusting element passes through the top of the seat and is drively connected to the bearing block; A suspension component is disposed in the inner cavity of the seat body. The bottom outer side of the suspension component is provided with a second bearing surface parallel to the first bearing surface. The first bearing surface and the second bearing surface cooperate with each other, and the inner side of the suspension component is locked with the sleeve.

[0007] In a preferred embodiment of the adjustable sleeve head fixing device with bearing seat of the present invention: the adjusting component includes a screw and a nut, the bottom of the screw is threadedly engaged with the bearing block, the nut is threadedly engaged with the top of the screw, and the nut abuts against the top surface of the seat.

[0008] In a preferred embodiment of the adjustable sleeve head fixing device with bearing seat of the present invention: the suspension member includes a slip seat and a slip tooth, the second bearing surface is disposed on the outer side of the bottom of the slip seat, the outer wall of the slip tooth is an outer conical surface, the inner wall of the slip seat is an inner conical surface, the outer conical surface and the inner conical surface cooperate, and the inner wall of the slip tooth bites the outer wall of the sleeve.

[0009] In a preferred embodiment of the adjustable sleeve head fixing device with a bearing seat according to the present invention: the seat, the bearing block and the suspension member are all split structures divided along the circumference, and are fastened together and attached to the periphery of the sleeve by fasteners.

[0010] In a preferred embodiment of the adjustable sleeve head fixing device with bearing seat described in this invention: both the first bearing surface and the second bearing surface are inclined surfaces with an inclination of 30° to 60° relative to the axis of the sleeve.

[0011] In a preferred embodiment of the adjustable sleeve head fixing device with bearing seat described in this invention: the axial adjustable stroke of the adjusting member is not less than 300mm.

[0012] In a preferred embodiment of the adjustable sleeve head fixing device with bearing seat of the present invention: the top of the slip seat is provided with an observation hole, the bottom of the observation hole extends to the bottom edge of the second bearing surface, so that the protrusion state of the first bearing surface relative to the second bearing surface can be visually judged through the observation hole.

[0013] In a preferred embodiment of the adjustable sleeve head fixing device with bearing seat of the present invention: the inner wall of the locking tooth is provided with multiple rows of transverse teeth along the axial direction, the tips of the teeth face the outer wall of the sleeve, and when the locking tooth contracts radially under the wedging action of the outer conical surface and the inner conical surface, the teeth penetrate into the outer wall surface of the sleeve to form a mechanical engagement.

[0014] In a preferred embodiment of the adjustable sleeve head fixing device with a bearing seat according to the present invention: the seat body is fixed to the top end of the conduit, the sleeve passes through the central channel of the seat body and extends upward, and the top end surface of the sleeve is not higher than the top end surface of the seat body, so that the top of the seat body forms a mounting base for directly receiving the upper sleeve head.

[0015] In a preferred embodiment of the adjustable sleeve head fixing device with a bearing seat according to the present invention: the screw hole of the bearing block is coated with thread-locking adhesive, and after the lower end of the screw is screwed into the screw hole, the thread-locking adhesive forms an anti-loosening lock on the threaded pair between the screw and the bearing block in the cured state.

[0016] The beneficial effects of this invention are as follows: By setting a seat body supported on the top of the guide tube, a bearing block slidably disposed within the guide structure of the seat body, an adjusting component connected to the bearing block in a transmission manner, and a suspension component disposed within the inner cavity of the seat body, this invention constructs a complete rigid force transmission path from the casing through the suspension component, the bearing block, the adjusting component to the seat body, and finally to the guide tube. This makes the suspension and fixation of the casing independent of the bonding quality of the cement sheath of the casing itself. At the same time, by rotating the adjusting component to drive the axial displacement of the bearing block to lift the suspension component, it achieves precise compensation for the seat position deviation caused by residual over-tension after cementing, thereby effectively suppressing the sinking of the surface casing and wellhead offset, and significantly improving the casing fixation accuracy and long-term stability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0018] Figure 1 A schematic diagram of an adjustable sleeve head fixing device with a support base is shown. Figure 2 A schematic diagram of the base of an adjustable sleeve head fixing device with a support seat is shown; Figure 3 A schematic diagram of the observation hole of the slip seat of an adjustable sleeve head fixing device with a bearing seat is shown; Figure 4A schematic diagram of the outer and inner conical surfaces of the slip teeth of an adjustable sleeve head fixing device with a support seat is shown. Figure 5 A schematic diagram of a support block for an adjustable sleeve head fixing device with a support seat is shown. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0021] Reference Figures 1-5 This embodiment provides an adjustable sleeve head fixing device with a support seat, including a seat body 1, fixed to the top of the conduit D, and a guide structure C1 extending axially inside the seat body 1; a support block 2, slidably disposed within the guide structure C1, with a first support surface M1 inclined relative to the axial direction on the inner side of the top of the support block 2, and a screw hole H1 on the upper end face of the support block 2; an adjusting member 3, passing through the top of the seat body 1 and being connected to the support block 2 in a transmission manner; and a suspension member 4, disposed in the inner cavity of the seat body 1, with a second support surface M2 parallel to the first support surface M1 on the outer side of the bottom of the suspension member 4, the first support surface M1 and the second support surface M2 cooperating, and the inner side of the suspension member 4 being locked with the sleeve T.

[0022] like Figure 2 The base 1 serves as the supporting base for the entire device, and its upper end is provided with a through hole H2; for example Figure 1 The bottom of the base 1 rests directly on the top surface of the guide pipe D, utilizing the large-area cement bond between the guide pipe D and the shallow strata to achieve ground anchorage, providing a rigid endpoint for the subsequent transfer of all loads. For example... Figure 2 The guide structure C1 extends axially along the inner wall of the seat 1 to constrain the bearing block 2 to slide only axially, converting the rotational motion of the adjusting member 3 into pure axial displacement of the bearing block 2, and ensuring that the posture of the first bearing surface M1 remains unchanged during the adjustment process.

[0023] like Figure 5The first bearing surface M1 on the inner side of the top of the bearing block 2 is inclined relative to the axial direction, so that when the vertical load from the suspension member 4 is transmitted to this surface, part of it is decomposed into a radial component pointing towards the axis of the sleeve T, thereby pushing the suspension member 4 towards the center of the sleeve T and realizing automatic centering during the bearing process. The screw hole H1 on the upper end face of the bearing block 2 and the lower end of the adjusting member 3 form a helical transmission pair. When the adjusting member 3 is rotated, the bearing block 2 generates axial displacement under the constraint of the guide structure C1, driving the first bearing surface M1 to rise or fall, so as to adjust the axial mounting position of the suspension member 4.

[0024] The adjusting member 3 extends into the interior of the seat 1 after passing through the through hole H2 at the top of the seat 1. Its upper limit structure axially abuts against the top surface of the seat 1, transmitting the tension from the bearing block 2 to the seat 1.

[0025] The suspension component 4 is disposed in the inner cavity of the seat body 1 and located above the bearing block 2. The second bearing surface M2 on the outer side of its bottom is parallel and fits against the first bearing surface M1, realizing surface contact bearing between the suspension component 4 and the bearing block 2. Under the gravity of the sleeve T, the inner side of the suspension component 4 radially contracts, and the toothed structure penetrates the outer wall surface of the sleeve T to form a mechanical engagement. The heavier the sleeve T, the tighter the engagement, realizing a self-locking suspension.

[0026] Thus, the entire vertical load of the casing T is transmitted step by step along the path of the suspension member 4, the second bearing surface M2, the first bearing surface M1, the bearing block 2, the adjusting member 3, and the seat 1, and finally all of it is introduced into the guide tube D through the lower end face of the seat 1, and then dissipated into the shallow formation by the formation cementing force through the guide tube D.

[0027] It should be noted that in existing surface casing fixing schemes, the top of the casing head directly connects to the surface casing, structurally serving only as a centering connection and lacking any ground anchorage. The vertical load of the casing string and the additional stress generated by formation deformation rely entirely on the bonding force between the cement sheath and the wellbore formation. However, under the influence of multiple uncontrollable factors such as formation stress release, temperature cycling, and the shrinkage of the cement slurry system itself, the bonding integrity of the cement sheath will inevitably gradually decline over time. Once local voids or a decrease in strength occur, the casing loses effective vertical and radial constraints, resulting in settlement displacement and wellhead deviation. Furthermore, after cementing operations are completed, the residual elastic overstretch within the casing string can typically reach tens of tons. This residual stress can cause an axial deviation of several millimeters between the actual engagement position of the hanger slips and the designed mounting surface. Existing structures lack any means of compensation or adjustment for this deviation, resulting in the slips being in a state of loose engagement or uneven loading, posing a risk of slippage during long-term service. The two problems mentioned above essentially stem from the same structural defect: the existing casing head design completely lacks a rigid mechanical force transmission link independent of the cement sheath bonding quality in the force transmission path, and also lacks the ability to actively compensate for residual over-tension in cementing.

[0028] Therefore, to address the aforementioned problems, this invention constructs a complete rigid force transmission path from the casing through the suspension component, the suspension component, and the support block to the seat and finally into the casing by setting a seat at the top of the guide tube, and placing the suspension component on the support block. The helical drive between the adjusting component and the support block allows the support block to be driven to move axially along the guide structure by rotating the adjusting component during cementing and after cementing, actively compensating for the suspension component's mounting position deviation caused by the elastic recoil of the casing, and ensuring that the first and second support surfaces always maintain full contact and fit. This invention uses the top of the guide tube as the sole support terminal, completely eliminating the dependence of the casing's cement sheath bonding quality on the casing's own suspension and fixing, fundamentally solving the problem of casing sinking and wellhead offset caused by cement sheath failure. At the same time, the precisely adjustable support block achieves quantitative compensation for residual over-tension in cementing, significantly improving the stability of the suspension device's mounting, positioning accuracy, and long-term service reliability of the device.

[0029] Specifically, the adjusting component 3 includes a screw 31 and a nut 32. The bottom of the screw 31 is threadedly engaged with the bearing block 2, and the nut 32 is threadedly engaged with the top of the screw 31, abutting against the top surface of the seat 1. The threaded engagement between the screw 31 and the bearing block 2 converts the rotational motion into axial displacement of the bearing block 2 along the guide structure C1. The nut 32 abutting against the top surface of the seat 1 forms an axial limit, causing the screw 31 to generate an upward axial traction force when the nut 32 is rotated. This drives the bearing block 2 to slide upward along the guide structure C1 to lift the suspension component 4, thereby compensating for the seat position deviation caused by residual over-tension from cementing. The thread pitch of the screw 31 and the nut 32 determines the axial displacement of the bearing block 2 per revolution, and thus determines the adjustment accuracy of the seat position compensation.

[0030] In one alternative implementation, the screw 31 can be a fully threaded screw, and the nut 32 can be a hexagonal nut, so that it can be operated on-site using a standard wrench; In another alternative embodiment, the screw 31 and nut 32 may also be selected as trapezoidal thread pairs. The tooth angle of the trapezoidal thread makes the thread root strength higher and the load-bearing capacity greater, while also having self-locking characteristics, making it suitable for use under conditions where the bushing is subjected to heavy loads for a long time.

[0031] Specifically, the suspension component 4 includes a slip seat 41 and a slip tooth 42, and the second bearing surface M2 is disposed on the outer side of the bottom of the slip seat 41, such as... Figure 4 The outer wall of the slip tooth 42 is an outer conical surface Z1, and the inner wall of the slip seat 41 is an inner conical surface Z2. The outer conical surface Z1 and the inner conical surface Z2 mate, and the inner wall of the slip tooth 42 bites the outer wall of the sleeve T.

[0032] The inner conical surface Z2 of the slip seat 41 is larger at the top and smaller at the bottom. The outer conical surface Z1 of the slip tooth 42 matches the taper of the inner conical surface Z2 of the slip seat 41. When the weight of the sleeve T is transmitted to the slip tooth 42 body through the teeth of the slip tooth 42, the slip tooth 42 tends to slide downward along the inner conical surface Z2. During this sliding process, the wedge-tightening effect between the outer conical surface Z1 and the inner conical surface Z2 forces the slip tooth 42 to contract radially inward, and the teeth on its inner wall bite into the outer wall surface of the sleeve T. The heavier the sleeve T, the tighter the slip tooth 42 holds, forming a positive feedback self-locking suspension.

[0033] In one optional embodiment, both the slip seat 41 and the slip tooth 42 are split structures divided into three circumferential segments, with a contraction gap between each segment. Each slip tooth 42 independently slides and contracts along the corresponding inner conical surface Z2 region to adapt to the local non-roundness of the outer wall of the sleeve T. In another alternative embodiment, the locking seat 41 and locking teeth 42 may also be divided into four or more circumferential segments. The more segments there are, the more uniform the radial contraction of each segment will be, the more fully the circumferential coverage of the outer wall of the sleeve will be, and the more balanced the circumferential distribution of the biting force will be.

[0034] Specifically, the base 1, the bearing block 2, and the suspension component 4 are all circumferentially segmented split structures, which are fastened together and attached to the outer periphery of the sleeve T using fasteners. The split structure allows the device to be installed without having to be inserted from the top of the sleeve T. Instead, the two halves can be pre-installed with the adjusting component 3 and the bearing block 2 respectively, and then the two halves can be closed and tightened from both sides of the sleeve T. Fastening bolts are then inserted through the flange surfaces of the two halves and locked in place, achieving on-site installation of the device without disassembly.

[0035] In one alternative embodiment, the base 1, the bearing block 2, and the suspension component 4 are all symmetrically divided into two halves along the same longitudinal dividing plane. The structures of the two halves are completely symmetrical, which facilitates the standardization of manufacturing molds and the interchangeability of parts. In another alternative implementation, the components can also be divided along different split surfaces to adapt to working conditions where on-site installation space is limited.

[0036] Specifically, both the first bearing surface M1 and the second bearing surface M2 are inclined planes with an inclination of 30° to 60° relative to the axis of the sleeve T, preferably 45°. When a vertical load F is applied to the inclined bearing surface, the load is decomposed into a normal component Fn = F·cos45° and a radial component Fr = F·sin45°. The radial component Fr pushes the suspension 4 towards the axis of the sleeve T, so that the initial alignment deviation of the locking teeth 42 relative to the sleeve T is automatically corrected. The static friction force generated by the normal component Fn between the first bearing surface M1 and the second bearing surface M2 is sufficient to resist the outward slippage tendency of the radial component Fr on the suspension 4. Under the conventional friction coefficient conditions of the steel-to-steel interface, the friction self-locking condition μ·Fn ≥ Fr always holds.

[0037] Specifically, the axial adjustable stroke of the adjusting component 3 is not less than 300mm and not less than the preset compensation amount. The 300mm axial adjustable stroke provides ample displacement compensation space for the bearing block 2, which is sufficient to cover the axial position deviation of several millimeters to tens of millimeters caused by the elastic recoil of the casing T after cementing operations. It also takes into account the differences in the release of residual over-tension of the casing under different block and well depth conditions, so that this device can be adapted to various cementing conditions without replacing parts.

[0038] Specifically, such as Figure 3 The top of the locator 41 is vertically provided with an observation hole K. The bottom of the observation hole K extends to the bottom edge of the second bearing surface M2, so that the protrusion state of the first bearing surface M1 relative to the second bearing surface M2 can be visually judged through the observation hole K.

[0039] As shown in the figure, during the initial adjustment during cementing and the secondary compensation adjustment after cementing, the operator looks downwards through the observation hole K. If the top of the first bearing surface M1 protrudes beyond the bottom edge of the second bearing surface M2, it indicates that the bearing block 2 has not yet lifted the suspension component 4 to the fully seated position, and the adjustment component 3 needs to be rotated further. If the first bearing surface M1 is flush with or slightly lower than the bottom edge of the second bearing surface M2, it indicates that the suspension component 4 has been fully seated. The observation hole K provides a means of visually judging the seated status of the device without disassembling any components, greatly improving the certainty and convenience of on-site operation.

[0040] Specifically, the inner wall of the locking tooth 42 has multiple rows of transverse teeth along the axial direction, with the tips of the teeth facing the outer wall of the sleeve T. When the locking tooth 42 contracts radially under the wedging action of the outer conical surface Z1 and the inner conical surface Z2, the teeth penetrate the outer wall surface of the sleeve T, forming a mechanical bite. The multiple rows of teeth are arranged in layers along the axial direction, so that the biting force is distributed along the axial direction of the sleeve T to multiple biting sections, avoiding stress concentration in a single row of teeth that could cause crushing of the sleeve surface or tooth breakage.

[0041] In one alternative embodiment, the hardness of the tooth tip is at least fifteen Rockwell hardness units higher than the hardness of the outer wall of the sleeve T, ensuring that the tooth tip can reliably penetrate the outer wall of the sleeve without undergoing its own plastic deformation. In another alternative implementation, the teeth can be formed by carburizing and quenching on the 42 base material, or a composite structure with embedded carbide teeth can be used to meet the biting requirements of high-grade steel sleeves.

[0042] Specifically, the base 1 is fixed to the top of the guide tube D. The casing T passes through the central channel of the base 1 and extends upward. The top surface of the casing T is not higher than the top surface of the base 1, so that the top of the base 1 forms an installation base for directly receiving the upper casing head. After cementing is completed and the suspension component 4 is confirmed to be in place, the excess length of the casing T is cut to be flush with or slightly lower than the top of the base 1 according to the wellhead design height. At this time, the top area of ​​the base 1 directly serves as the flange installation base surface of the upper casing head. The casing head sits directly on the top surface of the base 1, without the need for additional transition flanges or shims between the base 1 and the casing head, thus simplifying the vertical stacking layers of wellhead equipment.

[0043] Specifically, threadlocking adhesive is applied to the screw hole H1 of the bearing block 2. After the lower end of the screw 31 is screwed into the screw hole H1, the threadlocking adhesive, in its cured state, forms an anti-loosening lock on the threaded pair between the screw 31 and the bearing block 2. After the device has completed all adjustments and the suspension component 4 has been confirmed to be in place, the threadlocking adhesive gradually cures at room temperature, filling the microscopic gaps between the thread teeth and locking the threaded pair between the screw 31 and the bearing block 2 into one unit. This prevents slight loosening of the threaded pair due to equipment vibration, temperature fluctuations, or casing load fluctuations during long-term service, ensuring that the adjustment position remains stable throughout the entire drilling and subsequent production cycle.

[0044] It should be noted that in existing technologies, the suspension and fixation of the casing relies entirely on the bonding force of the cement sheath. Once the cement sheath experiences localized detachment or strength reduction, the casing loses effective constraint and experiences settlement displacement. Simultaneously, the elastic overstretch remaining within the casing string after cementing lacks any release pathway, causing the actual mounting position of the slips to deviate by several millimeters from the designed position. Existing structures lack any compensation mechanisms for this deviation, leaving the slips in a state of loose mounting or uneven loading for extended periods, posing a risk of slippage. Furthermore, in existing wellhead equipment, there is a lack of a unified force transmission terminal between the seat and the guide tube, and between the seat and the casing head. The load transmission path is dispersed and discontinuous, and contact failure at any interface can lead to the interruption of the entire force transmission chain.

[0045] Therefore, to address the aforementioned problems, this invention constructs a continuous rigid force transmission path from the casing through the suspension, the suspension, the support block, the adjusting component, to the support and finally into the casing. The helical drive between the adjusting component and the support block allows operators to perform axial precision adjustments during cementing and after cementing, actively compensating for positional deviations caused by casing elastic recoil, and visually verifying the adjustment results through an observation hole. This invention uses the top of the casing as the sole bearing terminal, completely eliminating the dependence on the cement sheath bonding quality of the casing itself for casing suspension and fundamentally solving the casing sinking and wellhead offset problems caused by cement sheath failure. Simultaneously, the self-centering and frictional self-locking effects of the precisely adjustable support block and the inclined bearing interface provide dual assurance of the suspension device's mounting accuracy and stability, significantly improving the long-term reliability of the device under complex cementing conditions.

[0046] Finally, it should be noted that the devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. An adjustable sleeve head fixing device with a bearing seat, characterized in that, include: A seat (1) is fixed to the top of the conduit (D), and the seat (1) is provided with a guide structure (C1) extending axially. The support block (2) is slidably disposed in the guide structure (C1). The top inner side of the support block (2) is provided with a first bearing surface (M1) that is inclined relative to the axial direction. The upper end surface of the support block (2) is provided with a screw hole (H1). Adjustment component (3) passes through the top of the seat (1) and is connected in a transmission manner to the bearing block (2); The suspension component (4) is located in the inner cavity of the seat body (1). The bottom outer side of the suspension component (4) is provided with a second bearing surface (M2) parallel to the first bearing surface (M1). The first bearing surface (M1) and the second bearing surface (M2) cooperate with each other. The inner side of the suspension component (4) is locked with the sleeve (T).

2. The adjustable sleeve head fixing device with a bearing seat as described in claim 1, characterized in that: The adjusting component (3) includes a screw (31) and a nut (32). The bottom of the screw (31) is threadedly engaged with the bearing block (2), and the nut (32) is threadedly engaged with the top of the screw (31). The nut (32) abuts against the top surface of the seat (1).

3. The adjustable sleeve head fixing device with a bearing seat as described in claim 1, characterized in that: The suspension component (4) includes a slip seat (41) and a slip tooth (42). The second bearing surface (M2) is located on the outer side of the bottom of the slip seat (41). The outer wall of the slip tooth (42) is an outer conical surface (Z1), and the inner wall of the slip seat (41) is an inner conical surface (Z2). The outer conical surface (Z1) and the inner conical surface (Z2) cooperate, and the inner wall of the slip tooth (42) bites the outer wall of the sleeve (T).

4. The adjustable sleeve head fixing device with bearing seat as described in claim 1, characterized in that: The seat (1), the bearing block (2) and the suspension member (4) are all split structures divided along the circumference, and are fastened together and attached to the periphery of the sleeve (T) by fasteners.

5. The adjustable sleeve head fixing device with a bearing seat as described in claim 1, characterized in that: Both the first bearing surface (M1) and the second bearing surface (M2) are inclined surfaces with an angle of 30° to 60° relative to the axis of the sleeve (T).

6. The adjustable sleeve head fixing device with a bearing seat as described in claim 1, characterized in that: The axial adjustable stroke of the adjusting component (3) is not less than 300 mm.

7. The adjustable sleeve head fixing device with a bearing seat as described in claim 1 or 3, characterized in that: The top of the locator (41) is vertically provided with an observation hole (K), the bottom of which extends to the bottom edge of the second bearing surface (M2), so that the protrusion state of the first bearing surface (M1) relative to the second bearing surface (M2) can be visually determined through the observation hole (K).

8. The adjustable sleeve head fixing device with a bearing seat as described in claim 3, characterized in that: The inner wall of the locking tooth (42) is provided with multiple rows of transverse teeth along the axial direction. The tips of the teeth face the outer wall of the sleeve (T). When the locking tooth (42) contracts radially under the wedging action of the outer conical surface (Z1) and the inner conical surface (Z2), the teeth penetrate the outer wall surface of the sleeve (T) to form a mechanical engagement.

9. The adjustable sleeve head fixing device with a bearing seat as described in claim 1, characterized in that: The seat (1) is fixed to the top of the conduit (D), the sleeve (T) passes through the central channel of the seat (1) and extends upward, and the top surface of the sleeve (T) is not higher than the top surface of the seat (1), so that the top of the seat (1) forms an installation base for directly receiving the upper sleeve head.

10. The adjustable sleeve head fixing device with a bearing seat as described in claim 2, characterized in that: The screw hole (H1) of the bearing block (2) is coated with thread adhesive. After the lower end of the screw (31) is screwed into the screw hole (H1), the thread adhesive forms an anti-loosening lock on the threaded pair between the screw (31) and the bearing block (2) in the cured state.

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