Shale gas wellhead casing device

Abstract

The utility model belongs to the field of shale gas exploitation, and particularly relates to a shale gas wellhead casing device which sequentially comprises an instrument and a rotary valve from top to bottom and further comprises an extension pipe used for connecting the instrument and the rotary valve, and an annular installation sleeve capable of moving along a pipe body is arranged on the extension pipe. The mounting sleeve is provided with a plurality of clamping grooves, the inner cambered surface of each arc-shaped module is provided with a clamping column which can be connected with the corresponding clamping groove in a matched mode, and the outer cambered surface of each arc-shaped module is provided with a clamping groove; the bottom of the clamping groove is provided with a barb groove, and the free end of the clamping column is provided with a barb matched with the barb groove. According to the utility model, the problems of meter reading and maintenance difficulty caused by the fact that the position of the sleeve is lower than the grating plate in the prior art can be solved, the safety risk of maintenance personnel is reduced, and water is prevented from entering the instrument.

Description

Technical Field

[0001] The utility model belongs to the field of shale gas mining, and in particular relates to a shale gas wellhead casing device. Background Art

[0002] In oil and gas field production, gas gathering stations are key facilities for natural gas collection and initial processing, making their operation safe and efficient. Wellhead casing pressure monitoring in gas gathering stations is a crucial parameter for ensuring normal gas well production and maintaining the stable operation of pipeline systems. However, traditional casing pressure installation methods have numerous shortcomings, posing significant challenges to field operations and maintenance. Specifically, traditional casing pressure sensors are typically installed beneath the grating of the wellbore. This installation method requires field operators to lie on the grating to read the casing pressure data, which is not only inconvenient but also poses serious safety hazards. Furthermore, for personnel who need to enter the wellbore to perform instrument maintenance, the confined space and poor lighting present serious safety risks, such as falls and hydrogen sulfide poisoning. Furthermore, the traditional casing pressure inlet conduit design is also non-standard. Because the conduit is higher than the electrical interface, rainwater can easily flow back into the instrument during the rainy season. Utility Model Content

[0003] The utility model proposes a shale gas wellhead casing device to solve the difficulties in meter reading and maintenance caused by the casing position being lower than the grid plate in the prior art, reduce the safety risks of maintenance personnel, and prevent water from entering the instrument.

[0004] The utility model provides a shale gas wellhead casing device, which comprises, from top to bottom, an instrument, a rotary valve, and an extension pipe for connecting the instrument and the rotary valve. The extension pipe is provided with an annular mounting sleeve that can move along the pipe body. The mounting sleeve is provided with a plurality of slots. The inner arc surface of each arc module is provided with a clamping column that can be matched with the slot, and the outer arc surface is provided with a slot. The bottom of the slot is provided with a barb groove, and the free end of the clamping column is provided with a barb that matches the barb groove.

[0005] Beneficial effects: 1. By adding an extension pipe between the instrument and the rotary valve, the instrument can be higher than the grille plate, making it more convenient for maintenance personnel to read the meter. In addition, due to the raised position of the instrument, potential damage to the instrument caused by liquid or gas backflow is effectively avoided, ensuring the stability and accuracy of the instrument. 2. For existing shale gas wellheads, in order to add an extension pipe without destroying the wellhead structure, it is necessary to cut the grille plate to form a modification port. Therefore, an installation sleeve is added to the extension pipe. Through freely splicable arc modules, a module with roughly the same shape and size as the grille plate modification port can be quickly spliced ​​together to achieve blocking, ensuring the safety and cleanliness of the wellhead, and avoiding safety accidents caused by maintenance personnel stepping on air, further improving the safety and reliability of the wellhead. This module simplifies the installation and splicing process, reduces on-site installation time and cost, and facilitates subsequent maintenance and replacement of parts. 3. The matching design of the barb and the barb groove effectively prevents the arc module from accidentally falling off or loosening during operation, enhancing the overall stability and safety of the wellhead casing device.

[0006] Furthermore, the arc modules are divided into the first arc module, the second arc module, and the Nth arc module in order from near to far according to the distance from the installation sleeve. By stacking layer by layer and in a circular manner, the finally assembled blocking module is closer to the shape and size of the modification port, making the blocking tighter, preventing debris from falling and people from stepping on air, and improving the compactness and functionality of the overall structure.

[0007] Furthermore, the first arc modules are inserted into the slots of the mounting sleeve to form a first circle of annular modules; the second arc modules are inserted into the slots of the first circle of annular modules to form a second circle of annular modules; the Nth arc modules are inserted into the slots of (N-1) annular modules to form an Nth circle of annular modules; each circle of arc modules can be spliced ​​to form an annular structure, which can enhance the structural strength.

[0008] Furthermore, the extension tube body is provided with external threads, and the mounting sleeve is provided with matching internal threads. This threaded connection allows for precise control of the mounting sleeve's position on the extension tube, ensuring that the overall layout of the wellhead casing assembly meets design requirements. The threaded connection also features a self-locking feature that effectively resists vibration and impact during wellhead operations, maintaining a stable and secure connection.

[0009] Furthermore, the number of the slots on the mounting sleeve is 12, and the corresponding number of the first arc-shaped modules is 12.

[0010] Furthermore, the number of the slots on the mounting sleeve is 6, and the corresponding number of the first arc-shaped modules is 6. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1This is a schematic diagram of the cooperation between the extension pipe and the installation sleeve of a shale gas wellhead casing device of the present invention;

[0012] Figure 2 This is a top view of a shale gas wellhead casing device of the utility model;

[0013] Figure 3 for Figure 2 Schematic diagram of the structure of the first arc module. DETAILED DESCRIPTION

[0014] The following is further described in detail through specific implementation methods:

[0015] The reference numerals in the drawings of the specification include: extension tube 1, mounting sleeve 2, clamping groove 3, clamping column 4, first arc module 5, second arc module 6, barb groove 7, barb 8.

[0016] Example 1: Figure 1-Figure 3 A shale gas wellhead casing assembly is shown, comprising an instrument at the top and a rotary valve at the bottom, with a casing extension device connected between the instrument and the rotary valve. The extension device comprises an extension tube 1, with internal threads at both ends for connection. The tube body of the extension tube 1 is externally threaded, and an annular mounting sleeve 2 is threadedly connected to the tube body of the extension tube 1.

[0017] The mounting sleeve 2 is evenly distributed with 12 slots 3. The inner surface of the first curved module 5 has a latch 4 that can be inserted into the slots 3. When all 12 first curved modules 5 are inserted into the mounting sleeve 2, they are spliced ​​to form a first ring of modules. The outer surface of the first curved module 5 has a latch 3 for inserting the second curved module 6. The second curved module 6 has a latch 4 that can be inserted into the slots 3. When all 12 second curved modules 6 are inserted into the first curved module, a second ring of modules is formed. Similarly, the mounting sleeve 2 can freely insert multiple layers of curved modules. Each layer can be fully populated or partially populated as needed, with a maximum of 12 modules fully populated. The free end of the latch 4 has a barb 8, and the slot 3 has a barb groove 7 that matches the barb.

[0018] When renovating an existing wellhead casing on-site, workers use pliers to cut a modification opening in the well screen. Disassembly begins at this opening (i.e., removing the instrument from the rotary valve). Extension tube 1 is threaded onto the rotary valve's interface, and then mounting sleeve 2 is rotated until it is roughly flush with the screen. The area and shape of the modification opening determine the location and number of curved modules required on mounting sleeve 2. For example, if extension tube 1 is located off-center from the modification opening, multiple layers of curved modules are inserted into mounting sleeve 2 at locations corresponding to the larger area of ​​the modification opening. This ensures that the final shape and area of ​​the curved modules are roughly equivalent to the modification opening, ultimately sealing the modification opening.

[0019] Example 2: The difference from Example 1 is that there are 6 slots 3 on the installation sleeve 2, the first circle of annular modules is composed of 6 first arc modules, the second circle of annular modules is composed of 6 second arc modules, and so on. Multiple layers of arc modules can be freely inserted into the installation sleeve 2, and each layer can be fully inserted or not fully inserted as needed, and the full number is 6.

[0020] The above description is merely an embodiment of the present invention, and the commonly known specific technical solutions and / or features of the solution are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be considered as the scope of protection of the present invention, and these will not affect the effectiveness of the implementation of the present invention and the practicality of the patent. The scope of protection claimed by the present invention shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A shale gas wellhead casing device, comprising, from top to bottom, an instrument and a rotary valve, characterized in that: It also includes an extension tube for connecting the instrument and the rotary valve, which is provided with an annular mounting sleeve that can move along the tube body; the mounting sleeve is provided with a plurality of slots, and the inner arc surface of each arc module has a clamping column that can match and connect with the slot, and the outer arc surface has a clamping slot; the bottom of the slot has a barb groove, and the free end of the clamping column has a barb that matches the barb groove.

2. A shale gas wellhead casing device according to claim 1, characterized in that: The arc modules are divided into a first arc module, a second arc module, and finally an Nth arc module in order from near to far distances from the mounting sleeve.

3. The shale gas wellhead casing device according to claim 2, characterized in that: The first arc modules are inserted into the slots of the mounting sleeve to form a first ring-shaped module; the second arc modules are inserted into the slots of the first ring-shaped module to form a second ring-shaped module; the Nth arc modules are inserted into the slots of the (N-1)th ring-shaped module to form an Nth ring-shaped module.

4. The shale gas wellhead casing device according to claim 3, characterized in that: The extension tube body is provided with an external thread, and the installation sleeve is provided with an internal thread matching the extension tube body.

5. The shale gas wellhead casing device according to claim 4, characterized in that: The number of the slots on the mounting sleeve is 12, and the number of the corresponding first arc-shaped modules is 12.

6. The shale gas wellhead casing device according to claim 5, characterized in that: The number of the slots on the mounting sleeve is 6, and the number of the corresponding first arc-shaped modules is 6.

Images