Multi-stage casing head capable of being adjusted during installation

Abstract

The utility model relates to the technical field of oil well casing heads, in particular to a multistage casing head capable of being adjusted during installation, which comprises a casing head main body, the casing head main body is arranged at the end part of a casing string, the casing head main body is arranged on a hoistway, and a base is fixed on the hoistway; the outer wall of the casing head body is sleeved with an adjusting ring in a threaded mode, and the adjusting ring can move in the axial direction of the casing head body. When sitting hanging is in place, the lower end of the casing head body abuts against the upper surface of the base, and sitting hanging of the casing head body is not affected by the adjusting ring. And when the sitting hanging is not in place, the adjusting ring can be rotated to displace, so that the lower end of the adjusting ring is propped against the upper surface of the base, sitting hanging support is provided between the casing head main body and the base, and the sitting hanging stability and safety of the casing are improved when the sitting hanging is not in place. According to the utility model, the technical problem that the casing head and the base are difficult to sit and hang in place when sitting and hanging errors exist is solved.

Description

Technical Field

[0001] This utility model relates to the field of oil well casing head technology, and more specifically, to a multi-stage adjustable casing head that can be installed. Background Technology

[0002] The casing head in an oil and gas well is a critical component of the entire wellhead assembly. Located at the bottom of the wellhead, it sits directly on the surface casing or guide pipe. The casing head is a key component of the wellhead assembly, used in oil and gas drilling or completion operations to support and seal the casing string, and to provide a connection interface for subsequent drilling, completion, or production operations. It forms the basis for connecting the various casing strings within the well to surface equipment such as blowout preventers and Christmas trees.

[0003] Currently, during the actual installation of casing heads, issues such as height deviation, misalignment, and deformation under stress may cause the casing head to fail to sit properly on the base after being connected to the casing string via threads. This can lead to problems such as wellhead sealing failure, on-site installation delays, and damage to the structure of tilting equipment during the installation of multi-stage casing heads.

[0004] Currently, during the installation of the casing head, the tubing is first inserted into the oil and gas wellbore, and then the casing string is matched outside the tubing, suspending the tubing inside the oil and gas wellbore. The casing head is then used to mount the casing string onto the base, providing support and sealing for the casing string.

[0005] However, during the actual installation of the casing head, issues such as height deviation, misalignment, and deformation under stress may cause the casing head to fail to sit properly on the base after being connected to the casing string via threads. This can lead to problems such as wellhead and wellbore sealing failure, on-site installation delays, improper installation of multi-stage casing heads, or installation tilt, and easy damage to the equipment structure.

[0006] To solve the above problems, a sleeve head that can maintain the hanging effect even when there is a hanging error is needed. Utility Model Content

[0007] The purpose of this application is to provide an adjustable multi-stage sleeve head during installation, which solves the technical problem of difficulty in properly mounting the sleeve head when there is a mounting error between the sleeve head and the base.

[0008] To solve the above-mentioned technical problems, the solution adopted in this application is as follows:

[0009] An adjustable multi-stage sleeve head for installation, comprising a sleeve head body.

[0010] Preferably, the casing head body is located at the end of the casing string, the casing head body is located on the wellbore, and a base is fixed on the wellbore.

[0011] Preferably, an adjusting ring is threaded onto the outer wall of the sleeve head body.

[0012] Preferably, when the sleeve head is in place, the lower end of the sleeve head body abuts against the upper surface of the base.

[0013] Preferably, when the seat is not properly positioned, the lower end of the adjusting ring abuts against the upper surface of the base.

[0014] Preferably, an indicator pin is vertically provided at the lower end of the sleeve head body.

[0015] Preferably, the upper surface of the base is provided with a pin hole that matches the vertical orientation of the display pin.

[0016] Preferably, the inner ring of the adjusting ring is provided with a trapezoidal thread, and the adjusting ring is fitted and matched with the external thread of the sleeve head body through the trapezoidal thread.

[0017] Preferably, the outer ring of the adjusting ring is provided with multiple adjusting holes.

[0018] Preferably, before mounting, the lower end of the adjusting ring does not extend beyond the lower end of the sleeve head body.

[0019] The technical solution of this application has at least the following advantages and beneficial effects:

[0020] In this utility model, in order to solve the problem of easy sitting error when the sleeve head is hung on the base, an adjustment ring is threaded on the outer wall of the sleeve head body. When the sleeve head body is not properly hung on the base, the position of the adjustment ring can be changed by thread adjustment, and the adjustment ring is used to abut against the base. Thus, the sleeve head body is fully supported on the base by the adjustment ring, thereby improving the sitting stability and safety.

[0021] In this invention, because the mounting error is small, workers can quickly observe and judge when the mounting is not in place. Therefore, an indicator pin is also provided on the main body of the sleeve head, and a pin hole matching the indicator pin is also provided on the upper surface of the base. During the mounting process, workers can observe whether the indicator pin is inserted into the pin hole in place to determine whether the sleeve head is mounted in place and the type of error in mounting. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the present invention when it is seated or hung.

[0023] Figure 2 This is a schematic diagram of the adjusting ring in this utility model.

[0024] Figure 3 This is a schematic diagram of the structure of the indicator pin in this utility model.

[0025] In the figure: 1-Casing head body, 2-Base, 3-Adjusting ring, 31-Trapezoidal thread, 32-Adjusting hole, 4-Indicator pin. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. The terms "center," "upper," "lower," "inner," and "outer," indicating orientation or positional relationships based on the orientation or positional relationships shown in the figures, or the orientation or positional relationships commonly used when the product is in use, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation on this application. It should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] Example

[0029] Please refer to Figures 1-3 This utility model provides an adjustable multi-stage casing head for installation, including a casing head body 1, which is fixed to the end of the casing string. An oil pipe is fitted inside the casing string and the casing head body 1. The oil pipe is installed in the wellbore for transporting oil and gas. A base 2 is fixedly mounted on the wellbore.

[0030] In the existing technology, the casing head body 1 is generally directly mounted on the base 2 to support and seal the casing string and tubing. However, when mounting the casing head body 1, it is easy to fail to mount it properly on the base 2 due to installation errors.

[0031] To solve the above problems, in this embodiment, an adjusting ring 3 is threaded on the outer wall of the sleeve head body 1. When the sleeve head body 1 is not properly seated on the base 2, the position of the adjusting ring 3 can be changed by thread adjustment, so that the adjusting ring 3 can be used to abut against the base 2, thereby making the sleeve head body 1 fully supported on the base 2, improving the stability and safety of the seat.

[0032] Specifically, the inner ring of the adjusting ring 3 is provided with a trapezoidal thread 31, and the adjusting ring 3 is sleeved with the external thread of the sleeve head body 1 through the trapezoidal thread 31.

[0033] During the mounting process, the adjusting ring 3 is threaded onto the casing head body 1 and mounts towards the base 2 along with the casing head body 1. At this time, the adjusting ring 3 will not extend beyond the end of the casing head body 1. This prevents a situation where, if the adjusting ring 3 extends beyond the casing head body 1 and the casing head body 1 is properly mounted and aligned with the base 2, the extended adjusting ring 3 would obstruct and interfere with the mounting process, preventing normal mounting. Therefore, during normal mounting, the adjusting ring 3 simply fits around the casing head body 1 and does not perform any adjustment.

[0034] Only when there is still a gap or angle error between the main body 1 of the casing head and the base 2 after the casing head body 1 has been displaced into position during the hanging process, the adjusting ring 3 is twisted to make it move along the length direction of the casing head body 1 through the thread, gradually approaching and abutting the base 2, so that the casing head body 1 is hung on the base 2 through the adjusting ring 3.

[0035] The adjusting ring 3 has multiple adjusting holes 32 on its outer ring. These holes 32 can be connected to tools, allowing the operator to rotate the adjusting ring 3 to move it. (The matching of the adjusting holes 32 and the tools can be configured as a quick-release structure, such as matching a hexagonal hole with a hexagonal wrench, or a screw hole with a stud.)

[0036] It is worth noting that during the mounting process, when the casing head body 1 and the base 2 are not properly mounted, there are two main mounting states. One is due to spacing errors (such as inaccurate distance measurement, deformation of the tubing causing changes in the matching position of the casing head body 1), resulting in no contact between the casing head body 1 and the base 2, with a straight-line gap. The other is due to angle errors (such as casing string misalignment, angular deflection in the wellbore), resulting in only one side of the casing head body 1 and the base 2 being in contact, with the contact mounting surfaces of the two forming an angle, resulting in uneven stress.

[0037] The adjustment effect of the adjusting ring 3 on the sleeve head body 1 differs depending on the two main situations described above. The specific principles are as follows:

[0038] When the casing head body 1 and base 2 are not properly seated, resulting in a straight-line gap, the lower end face of the adjusting ring 3 is parallel to the upper surface of the base 2. At this point, the operator directly rotates the adjusting ring 3 using a tool, causing it to move vertically downwards. The adjusting ring 3 gradually extends beyond the lower end of the casing head body 1, and its lower end face approaches and abuts against the upper surface of the base 2. When the operator can no longer turn the adjusting ring 3, the tool is removed, completing the seating function. At this point, the entire lower end face of the adjusting ring 3 is completely in contact with the upper surface of the base 2, allowing the weight of the casing head body 1, casing string, and tubing on the adjusting ring 3 to be transferred to the base 2 for support. Furthermore, the trapezoidal thread 31 on the adjusting ring 3 has higher strength than ordinary threads, enabling it to withstand higher loads and share the weight transmitted from the casing head body 1, maintaining the safety and stability of all equipment.

[0039] When the casing head body 1 is not properly seated on the base 2, resulting in uneven force distribution, the lower end face of the adjusting ring 3 forms an angle with the upper surface of the base 2. At this point, the operator directly rotates the adjusting ring 3 using a tool, causing it to shift towards the lower end of the casing head body 1. The adjusting ring 3 gradually extends beyond the lower end of the casing head body 1, and one side of its lower end face first approaches and abuts against the upper surface of the base 2. When the operator can no longer turn the adjusting ring 3, the tool is removed, completing the seating function. At this time, part of the lower end face of the adjusting ring 3 is in contact with the upper surface of the base 2, so that part of the lower end face of the adjusting ring 3 and the contact end of the casing head body 1 work together on the upper surface of the base 2, increasing the seating area and thus improving seating stability. Furthermore, the trapezoidal thread 31 on the adjusting ring 3 can also distribute the weight from the casing head body 1, ensuring that the weight of the casing head body 1 is distributed across the adjusting ring 3, preventing the weight from being concentrated at a single point and improving the safety of the casing head body 1 during seating.

[0040] Furthermore, because the installation process requires precise measurement and calculation to ensure construction safety, even if the installation of the casing head body 1 and the base 2 is inaccurate due to unforeseen circumstances and fails to be installed in place, the resulting error range is relatively small. This small error makes it difficult for workers to accurately observe whether the casing head body 1 is installed in place during the installation process, thus making it difficult to ensure the stability and safety of the installation.

[0041] To address the aforementioned issues, an indicator pin 4 is also provided on the main body 1 of the casing head, which is used to indicate to the staff that the main body 1 of the casing head is in the correct position during the mounting process.

[0042] Specifically, the display pin is pin-shaped, with its top end vertically fixed to the lower end section of the sleeve head body 1, while the upper surface of the base 2 is also provided with a pin hole that matches the display pin.

[0043] During the mounting process, when the sleeve head body 1 is properly mounted on the surface of the base 2, the indicator pin can be vertically inserted into the pin hole. When the sleeve head body 1 and the base 2 are in contact, the indicator pin cannot be observed by the staff, thus prompting the staff to mount the sleeve in place.

[0044] During the mounting process, when there is a straight-line gap between the sleeve head body 1 and the base 2 surface, the indicator pin can be vertically inserted into the pin hole. However, after the sleeve head body 1 and the base 2 are close together, the staff can observe the indicator pin through the gap, thus prompting the staff that the mounting is not in place and that the mounting problem comes from the straight-line gap.

[0045] During the mounting process, when the sleeve head body 1 is mounted on the surface of the base 2 and there is uneven force, the indicator pin cannot be inserted into the pin hole due to the angle deviation, and the sleeve head body 1 and the base 2 do not fit together. At this time, the staff can directly observe that the indicator pin is not inserted into the pin hole, thus prompting the staff that the mounting is not in place and that the mounting problem is caused by uneven force.

[0046] In practice, the error gap is small. To increase the visibility of the display pin, in some embodiments, the shaft end of the display pin extending beyond the end of the sleeve head body 1 is coated with conspicuous paint or markings. When the pin is properly seated, it is fully inserted into the pin hole, and the staff cannot observe the conspicuous paint or markings. However, when the pin is not properly seated, the paint or markings on the display pin will be quickly observed by the staff, thereby improving the accuracy of the staff's judgment.

[0047] The various embodiments of this utility model have now been described in detail. To avoid obscuring the concept of this utility model, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solution of this utility model based on the above description. The scope of this utility model is defined by the appended claims.

Claims

1. A multi-stage adjustable sleeve head for installation, characterized in that, Includes the main body of the sleeve head (1); The casing head body (1) is located at the end of the casing string, and the casing head body (1) is located on the wellbore, and a base (2) is fixed on the wellbore; An adjusting ring (3) is threaded onto the outer wall of the sleeve head body (1); When the sleeve head body (1) is in place, the lower end of the sleeve head body (1) abuts against the upper surface of the base (2); When the seat is not properly positioned, the lower end of the adjusting ring (3) abuts against the upper surface of the base (2).

2. The adjustable multi-stage sleeve head according to claim 1, characterized in that, The lower end of the sleeve head body (1) is provided with an indicator pin (4); The upper surface of the base (2) is provided with a pin hole that matches the vertical position of the display pin.

3. The adjustable multi-stage sleeve head according to claim 1, characterized in that, The inner ring of the adjusting ring (3) is provided with a trapezoidal thread (31), and the adjusting ring (3) is matched with the external thread of the sleeve head body (1) through the trapezoidal thread (31).

4. The adjustable multi-stage sleeve head according to claim 1, characterized in that, The outer ring of the adjusting ring (3) is provided with a plurality of adjusting holes (32).

5. The adjustable multi-stage sleeve head according to claim 1, characterized in that, Before mounting, the lower end of the adjusting ring (3) should not extend beyond the lower end of the sleeve head body (1).

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