An ultra-large radial locking device suitable for casing heads and pipelines at oil and gas wellheads

Abstract

The present invention discloses an oversized radial locking device suitable for casing heads and pipelines at oil and gas wellheads in the field of pipeline connection technology, including an installation unit, including a sleeve component sleeved on the pipeline, multiple groups of pressure measuring valves arranged on the sleeve component, and two groups of sealing strips arranged on the inner wall of the sleeve component and symmetrically located on the upper and lower sides of the inner end of the pressure measuring valve. The present invention designs a large-size radial locking mechanism, breaking the previous welding operation method between the base and the water-proof pipe, improving the retention performance between the wellhead and the water-proof pipe, and is easy to install, reliable in connection, and can be equipped with matching seals. When the roundness of the pipe diameter is not enough and there is slight deformation, it can also meet the connection requirements, so it has stronger applicability and practicality.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline connection, and in particular to an oversized radial locking device suitable for casing heads and pipelines at oil and gas production wellheads. Background Art

[0002] In the prior art, welding is often used as a method of fixing the bottom device of the wellhead equipment of oil and gas wells and the water-blocking pipe. However, due to the characteristics of welding, the weather and post-welding insulation conditions are relatively high when welding the pipe, and the welding quality cannot be 100% guaranteed. At the same time, the welding connection method has a low fault tolerance rate. Once additional conditions occur, it is difficult to perform other operations again. Moreover, the larger the diameter of the water-blocking pipe, the more difficult it is to operate the welding connection method. Summary of the invention

[0003] In view of the problems existing in the above-mentioned existing oversized radial locking devices applicable to casing heads and pipelines at oil and gas production wellheads, the present invention is proposed.

[0004] Therefore, the purpose of the present invention is to provide an extra-large radial locking device suitable for casing heads and pipelines at oil and gas production wellheads, the purpose of which is to simplify the connection method between the device and the pipeline, improve the fault tolerance of the connection measures, and effectively ensure the connection effect.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: including, an installation unit, including a sleeve component sleeved on the pipeline, sealing strips arranged on the inner wall of the sleeve component in groups of two, and a pressure measuring valve correspondingly arranged on each group of the sealing strips; and a locking unit, including a pushing component arranged on the outer wall of the sleeve component in a vertical direction, and one end of the pushing component extends into the sleeve component, a cava component connected to the inner end of the pushing component, a connecting cover sleeved on the outer end of the pushing component, a transmission nut sleeved in the connecting cover, a locking nut located at the top of the transmission nut, a tightening nut located at the top of the locking nut, and a stop screw arranged on the outside of the connecting cover, and the inner end of the stop screw passes through the connecting cover and abuts against the outer wall of the transmission nut.

[0006] As a preferred solution of the super-large radial locking device suitable for casing heads and pipelines at oil and gas wellheads described in the present invention, there are two rows of locking units, each row has 20 groups, and the two rows of locking units are symmetrically and evenly distributed on the outer walls of both ends of the sleeve component, the head ends of the slip components on the inner ends of each adjacent two groups of locking units are close to each other's tail ends, and there is a gap between the two, and the outer end of the pushing component passes through the inside of the pushing component, the connecting cover, the transmission nut, the locking nut and the tightening nut from the inside to the outside.

[0007] As a preferred solution of the super-large radial locking device suitable for oil and gas wellhead casing heads and pipelines described in the present invention, the sleeve component includes a circular tubular sleeve, a storage groove opened on the inner wall of the sleeve and corresponding to the position of the slip component, and two groups of bolts symmetrically arranged on the outer wall of the sleeve in the vertical direction, and the upper and lower sides of the end of the connecting cover are inserted into the bolts.

[0008] As a preferred solution of the oversized radial locking device suitable for oil and gas wellhead casing heads and pipelines described in the present invention, the pushing component includes a connecting rod extending into the pipe sleeve, a connecting block arranged at the inner end of the connecting rod and extending into the slip component, a threaded rod arranged at the outer end of the pushing component and extending outward to the outside of the pipe sleeve, and a top nut arranged at a fixed point on the outer end of the threaded rod.

[0009] As a preferred solution of the super-large radial locking device suitable for oil and gas wellhead casing heads and pipelines described in the present invention, the slip component includes a slip tooth with an arc-shaped structure, a limiting groove opened on the slip tooth, and the connecting block is inserted into the limiting groove, and slip teeth arranged at multiple levels of inclined angles are opened on the inner side wall of the slip tooth.

[0010] As a preferred solution of the oversized radial locking device suitable for oil and gas wellhead casing heads and pipelines described in the present invention, the connecting cover includes a sleeve sleeved on the threaded rod, and a connecting seat arranged at the end of the sleeve and tightly attached to the outer wall of the pipe sleeve, and the upper and lower ends of the connecting seat are respectively inserted into the bolts.

[0011] As a preferred solution of the oversized radial locking device suitable for oil and gas wellhead casing heads and pipelines described in the present invention, the transmission nut includes a transmission cylinder extending into the sleeve, and the transmission cylinder is threadedly connected to the threaded rod, a tail end round head is arranged at the end of the transmission cylinder, and a limiting hole exists at the connection position between the transmission cylinder and the tail end round head.

[0012] As a preferred solution of the oversized radial locking device suitable for oil and gas wellhead casing heads and pipelines described in the present invention, the locking nut and the tightening nut are both threadedly connected to the threaded rod, the stop screw is threadedly connected to the sleeve in a vertical direction, and the end passes through the sleeve and extends into the limiting hole.

[0013] The beneficial effects of the present invention are as follows: a large-size radial locking mechanism is designed to break the previous welding operation mode between the base and the watertight conductor, thereby improving the retention performance between the wellhead and the watertight conductor, and the installation is convenient, the connection is reliable, and it can be equipped with a matching seal. Even when the pipe diameter is not round enough and there is slight deformation, it can still meet the connection requirements, so it has stronger applicability and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0015] Figure 1 The present invention is a schematic diagram of the overall structure of the super-large radial locking device applicable to the casing head and pipeline of the oil and gas production wellhead.

[0016] Figure 2 It is a longitudinal sectional plan schematic diagram of the super-large radial locking device applicable to the casing head and pipeline of the oil and gas production wellhead of the present invention.

[0017] Figure 3 The present invention is a schematic structural diagram of a locking unit of an ultra-large radial locking device applicable to casing heads and pipelines at oil and gas production wellheads.

[0018] Figure 4 The present invention is a schematic diagram of the structural decomposition of a locking unit of an ultra-large radial locking device applicable to casing heads and pipelines at oil and gas production wellheads.

[0019] Figure 5 This is a schematic diagram of the super-large radial locking device of the casing head and pipeline of the oil and gas production wellhead of the present invention being applied to two identical pipelines and the pipeline retention.

[0020] Figure 6 The present invention is a schematic diagram of the super-large radial locking device applicable to casing heads and pipelines at oil and gas production wellheads being applied to the retention of watertight pipes.

[0021] Figure 7 The invention is an ultra-large radial locking device suitable for casing heads and pipelines at oil and gas production wellheads Figure 6 A schematic diagram of the enlarged structure in the middle.

[0022] 10. The nut of the embodiment of the present invention is as follows: 100, mounting unit; 101, sleeve component; 101a, pipe sleeve; 101b, storage groove; 101c, bolt; 102, pressure measuring valve; 103, sealing strip; 200, locking unit; 201, pushing component; 201a, connecting rod; 201b, connecting block; 201c, threaded rod; 201d, top nut; 202, slip component; 202a, slip tooth; 202b, limiting groove; 202c, slip tooth; 203, connecting cover; 203a, sleeve; 203b, connecting seat; 204, transmission nut; 204a, transmission cylinder; 204b, round head at the tail end; 204c, limiting hole; 205, locking nut; 206, tightening nut; 207, stop screw. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0026] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0027] Example 1

[0028] Reference Figure 1 to Figure 3 , which is the first embodiment of the present invention, provides an ultra-large radial locking device suitable for casing heads and pipelines at oil and gas production wellheads, the device comprising an installation unit 100, comprising a sleeve component 101 sleeved on the pipeline, sealing strips 103 arranged on the inner wall of the sleeve component 101 in groups of two, and a pressure measuring valve 102 correspondingly arranged on each group of sealing strips 103, the sleeve component 101 is a circular ring structure, which is convenient for sleeve matching on the pipeline;

[0029] Four sealing strips 103 are further moved in the socket component. The four groups of sealing strips 103 are grouped in pairs. Two groups of pressure testing valves 102 are symmetrically arranged on each sealing strip 103, and the two groups of pressure testing valves 102 are connected to the inside of the sealing strip 103. Test gas can be injected into the sealing strip 103 through the two groups of connected pressure testing valves 102. At the same time, a pressure testing valve 102 is connected between the sealing strips 103 that are grouped in pairs. This pressure testing valve 102 can be used to detect whether the gas injected from the other two groups of pressure testing valves 102 is injected into the sealing strip 103, thereby achieving the effect of sealing pressure testing.

[0030] The locking unit 200 includes a pushing component 201 vertically arranged on the outer wall of the sleeve component 101, and one end of the pushing component 201 extends into the sleeve component 101, a cava component 202 connected to the inner end of the pushing component 201, a connecting cover 203 sleeved on the outer end of the pushing component 201, a transmission nut 204 sleeved in the connecting cover 203, a locking nut 205 located at the top of the transmission nut 204, a tightening nut 206 located at the top of the locking nut 205, and a stop screw 207 arranged on the outside of the connecting cover 203, and the inner end of the stop screw 207 passes through the connecting cover 203 and abuts against the outer wall of the transmission nut 204.

[0031] During use, the device sleeve component 101 is sleeved on the outside of the pipe, and the pushing component 201 is rotated clockwise by tapping the wrench to push the connecting cover 203 to abut against the outer wall of the pipe. Then, the locking nut 205 is tightened and the nut 206 is tightened to apply the double limit function to keep the connecting cover 203 fixed in the abutting state and unable to loosen, and continue to apply the force abutting against the outer wall of the pipe, so as to connect the sleeve component 101 to the pipe. If it needs to be disassembled, loosen and tighten the nut 206 and the locking nut 205 in turn, and then rotate the pushing component 201 counterclockwise to move the pushing component 201 outward and drive the connecting cover 203 to break away from the abutment with the outer wall of the pipe. At this time, the pipe will be disconnected from the locking unit 200.

[0032] Example 2

[0033] Reference Figure 2 to Figure 7 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that multiple sets of locking units 200 are provided to form multiple entry points with the outside of the pipeline, which greatly increases the connectivity with the pipeline and significantly improves the stability when connecting the pipeline.

[0034] Compared with Example 1, further, there are two rows of locking units 200, each row has 20 groups, and the two rows of locking units 200 are symmetrically and evenly distributed on the outer walls of the two ends of the socket component 101. The cava components 202 on the inner ends of each two adjacent groups of locking units 200 have their head ends close to each other's tail ends, and there is a gap between the two. The outer end of the pushing component 201 passes through the interior of the pushing component 201, the connecting cover 203, the transmission nut 204, the locking nut 205 and the tightening nut 206 from the inside to the outside.

[0035] During use, each locking unit 200 includes a set of slip components 202, and multiple sets of slip components 202 are distributed around the locking unit 200. When the device is sleeved on the outside of the pipeline, the connecting cover 203 on the device can be evenly distributed around the outside of the pipeline from multiple directions to ensure the stability between the force points. Figure 2The 20 groups of slip components 202 corresponding to the 20 groups of locking units 200 in each row can apply forces from 20 directions in different circumferential directions at the same horizontal height on the outer wall of the corresponding pipe, and there are at least 20 contact points in 20 directions. In this way, when the roundness of the pipe diameter is not enough, there are enough contact points between the guarantee device and the pipe to provide sufficient bearing capacity.

[0036] Among them, the sleeve component 101 includes a circular tubular sleeve 101a, a storage groove 101b opened on the inner wall of the sleeve 101a and corresponding to the position of the cava component 202, and two groups of bolts 101c symmetrically arranged on the outer wall of the sleeve 101a in the vertical direction, and the upper and lower ends of the connecting cover 203 are inserted into the bolts 101c.

[0037] During use, the pipe sleeve 101a of the circular tube structure makes it convenient to connect the device to the outside of the pipe, and the cava component 202 can be stored in the storage groove 101b as a whole. The upper and lower sides of the cava component 202 are limited by the storage groove 101b and can only slide vertically in the horizontal direction in the storage groove 101b.

[0038] Among them, the pushing component 201 includes a connecting rod 201a extending into the sleeve 101a, a connecting block 201b arranged at the inner end of the connecting rod 201a and extending into the cava component 202, a threaded rod 201c arranged at the outer end of the pushing component 201 and extending outward to the outside of the sleeve 101a, and a top nut 201d arranged at a fixed point at the outer end of the threaded rod 201c.

[0039] During use, the locking nut 205, the tightening nut 206 and the transmission nut 204 are all threadedly connected to the connecting rod 201a, and the connecting block 201b is a T-shaped structure extending into the limit groove 202b. Therefore, the pushing component 201 is connected to the cava component 202 through the connecting block 201b, which can drive the pushing component 201 to slide in the horizontal direction.

[0040] Among them, the connecting cover 203 includes a sleeve 203a which is sleeved on the threaded rod 201c, and a connecting seat 203b which is arranged at the end of the sleeve 203a and is tightly attached to the outer wall of the pipe sleeve 101a, and the upper and lower ends of the connecting seat 203b are respectively inserted into the bolt 101c. When the connecting seat 203b is inserted into the bolt 101c, the connecting seat 203b can be fixed and limited to the outside of the pipe sleeve 101a by installing a nut on the top of the bolt 101c, thereby playing a role of limiting and fixing.

[0041] Among them, the transmission nut 204 includes a transmission cylinder 204a extending into the sleeve 203a, and the transmission cylinder 204a is threadedly connected to the threaded rod 201c, a tail round head 204b is arranged at the end of the transmission cylinder 204a, and a limiting hole 204c exists at the connection position between the transmission cylinder 204a and the tail round head 204b.

[0042] During use, the transmission cylinder 204a is integrally inserted into the sleeve 203a, and a thread matching the threaded rod 201c is provided inside the transmission cylinder 204a. Therefore, there is a threaded connection between the transmission cylinder 204a and the threaded rod 201c. A limit plate is provided at the top of the transmission cylinder 204a. The size of the limit plate is larger than the inner diameter of the sleeve 203a, thereby limiting the top of the transmission cylinder 204a outside the sleeve 203a, making it impossible to be fully inserted into the sleeve 203a.

[0043] Among them, the locking nut 205 and the tightening nut 206 are both threadedly connected to the threaded rod 201c, and the stop screw 207 is threadedly connected to the sleeve 203a in the vertical direction, and the end passes through the sleeve 203a and extends to the limiting hole 204c. The stop screw 207 extending into the limiting hole 204c can limit and fix the transmission cylinder 204a in the sleeve 203a, so that it can no longer slide horizontally or rotate in the circumferential direction in the sleeve 203a.

[0044] During use, the connecting cover 203 is fixed on the outer wall of the pipe sleeve 101a, and then the transmission nut 204 inserted in the sleeve 203a is fixed by the stop screw 207, and the connecting block 201b is clamped by a wrench to drive the pushing component 201 to rotate clockwise. The pushing component 201 will cooperate with the thread of the transmission cylinder 204a through the threaded rod 201c, and will extend as a whole to the inside of the pipe sleeve 101a. The inwardly extended pushing component 201 will push the slip component 202 through the end. At this time, the slip component 202 will extend a part of it from the storage groove 101b, and be squeezed and pushed by the pushing component 201 to fit firmly on the inner wall of the pipe. Then, the locking nut 205 and the tightening nut 206 are tightened to perform double limit reinforcement. Multiple sets of locking units 200 are operated in the same way, and the device can be connected to the pipeline as a whole from multiple directions.

[0045] The remaining structures are the same as those of Example 1.

[0046] Example 3

[0047] Reference Figure 3 to Figure 7 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that the preload force between the device and the pipeline is strengthened by arranging the slip components 202 in a specific orientation.

[0048] Compared with Example 2, further, the cava component 202 includes an arc-shaped cava tooth 202a, a limiting groove 202b provided on the cava tooth 202a, and a connecting block 201b inserted into the limiting groove 202b, and a cava tooth 202c arranged at multiple levels of inclined angles provided on the inner side wall of the cava tooth 202a.

[0049] During use, the cava tooth 202a is an arc-shaped structure, and its upper and lower surfaces are in contact with the storage groove 101b. It is limited by the storage groove 101b and can only slide horizontally along the storage groove 101b. The setting of the arc-shaped structure can better fit the outer wall of the pipeline and increase the tightness of the connection with the pipeline. The cava tooth 202c set at an inclined angle can squeeze and cut into the outer wall of the pipeline when in contact with the outer wall of the pipeline, thereby increasing the friction between the device and the pipeline and further ensuring the connectivity between the two. At the same time, since the device adopts multiple groups of cava components 202, the cava teeth 202c on every two adjacent groups of cava components 202 have opposite inclination angles. In this way, multiple groups of cava components 202 at the same horizontal height can have pre-tightening forces from both the upper and lower sides at the same time.

[0050] The remaining structure is the same as that of Example 2.

[0051] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0052] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An ultra-large radial locking device suitable for casing heads and pipelines at oil and gas production wellheads, characterized by: include, The installation unit (100) comprises a sleeve component (101) sleeved on a pipeline, sealing strips (103) arranged in groups of two on the inner wall of the sleeve component (101), and a pressure measuring valve (102) correspondingly arranged on each group of the sealing strips (103); and, The locking unit (200) comprises a pushing component (201) vertically arranged on the outer wall of the sleeve component (101), one end of the pushing component (201) extending into the sleeve component (101), a slip component (202) connected to the inner end of the pushing component (201), a connecting cover (203) sleeved on the outer end of the pushing component (201), a driving nut (204) sleeved in the connecting cover (203), a locking nut (205) located at the top end of the driving nut (204), a tightening nut (206) located at the top end of the locking nut (205), and a stop screw (207) arranged on the outer side of the connecting cover (203), wherein the inner end of the stop screw (207) passes through the connecting cover (203) and abuts against the outer wall of the driving nut (204); The locking units (200) are arranged in two rows, each row having 20 groups, and the two rows of locking units (200) are evenly and symmetrically distributed on the outer walls at both ends of the sleeve component (101). The head ends of the slip components (202) on the inner ends of each two adjacent groups of locking units (200) are close to each other's tail ends, and there is a gap between them. The outer end of the pushing component (201) passes through the inside of the pushing component (201), the connecting cover (203), the transmission nut (204), the locking nut (205), and the tightening nut (206) in sequence from the inside to the outside.

2. The super-large radial locking device for casing heads and pipelines at oil and gas production wellheads according to claim 1 is characterized in that: The sleeve component (101) comprises a circular tubular sleeve (101a), a receiving groove (101b) provided on the inner wall of the sleeve (101a) and corresponding to the position of the slip component (202), and two groups of bolts (101c) symmetrically arranged on the outer wall of the sleeve (101a) in a vertical direction, and the upper and lower sides of the end of the connection cover (203) are inserted into the bolts (101c).

3. The super-large radial locking device for casing heads and pipelines at oil and gas production wellheads according to claim 2 is characterized in that: The pushing component (201) comprises a connecting rod (201a) extending into the pipe sleeve (101a), a connecting block (201b) arranged at the inner end of the connecting rod (201a) and extending into the slip component (202), a threaded rod (201c) arranged at the outer end of the pushing component (201) and extending outward to the outside of the pipe sleeve (101a), and a top nut (201d) arranged at a fixed point on the outer end of the threaded rod (201c).

4. The super-large radial locking device for casing heads and pipelines at oil and gas production wellheads according to claim 3 is characterized in that: The slip component (202) comprises a slip tooth (202a) of an arc-shaped structure, a limiting groove (202b) provided on the slip tooth (202a), the connecting block (201b) being inserted into the limiting groove (202b), and slip teeth (202c) arranged at multiple levels of inclined angles provided on the inner side wall of the slip tooth (202a).

5. The super-large radial locking device for casing heads and pipelines at oil and gas production wellheads according to claim 4 is characterized in that: The connecting cover (203) comprises a sleeve (203a) sleeved on the threaded rod (201c), and a connecting seat (203b) arranged at the end of the sleeve (203a) and tightly attached to the outer wall of the pipe sleeve (101a), and the upper and lower ends of the connecting seat (203b) are respectively plugged into the bolt (101c).

6. The super-large radial locking device for casing heads and pipelines at oil and gas production wellheads according to claim 5, characterized in that: The transmission nut (204) comprises a transmission cylinder (204a) extending into the sleeve (203a), the transmission cylinder (204a) being threadedly connected to the threaded rod (201c), a tail round head (204b) arranged at the end of the transmission cylinder (204a), and a limiting hole (204c) existing at the connection position between the transmission cylinder (204a) and the tail round head (204b).

7. The super-large radial locking device for casing heads and pipelines at oil and gas production wellheads according to claim 6 is characterized in that: The locking nut (205) and the tightening nut (206) are both threadedly connected to the threaded rod (201c), and the stop screw (207) is vertically threadedly connected to the sleeve (203a), with the end thereof penetrating the sleeve (203a) and extending into the limiting hole (204c).

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