A self-weight activated slip hanger with PR2F structure for casing head

Abstract

The application discloses a self-weight excitation type slip hanger with a PR2F structure for a casing head, which comprises a supporting assembly, a slip assembly and a connecting piece. The supporting assembly comprises a supporting base, a sealing element and a gasket, the sealing element is arranged on the supporting base, and the gasket is arranged on the sealing element. The slip assembly comprises a slip shell and a slip tooth, the slip shell is provided with a taper hole, and the slip tooth is arranged in the taper hole. The supporting assembly is fixed to the slip shell through the connecting piece. The internal sliding block ring can better ensure the synchronism of the slip when the slip is hung on the hanger casing, and the limiting block can make the slip shell be properly separated, so that the slip tooth can be assembled into the slip shell.

Description

Technical Field

[0001] This invention relates to the field of suspension technology, and in particular to a weight-activated slip suspension with a PR2F structure for a sleeve head. Background Technology

[0002] The casing head assembly is mainly used to fix the wellhead of the drilled well, connect the downhole casing string, and reliably seal and control the annular space between the casing and the casing. It is an important piece of equipment in oilfield (gas) wellhead assemblies. The casing hanger is the most crucial component within the casing head assembly. Currently, there are two types of casing hangers on the market: automatically activated sealing slip hangers and manually activated sealing slip hangers. The self-weight activated slip hanger has been widely used in domestic and international markets. The self-weight activated slip hanger is an annular hanger composed of a sealing ring, slips, and slip housing. It has a split, self-locking structure. After the casing is suspended, the sealing ring below the slips automatically forms a seal on the casing due to gravity. Casing tilt can be reduced by controlling friction. The self-weight activated slip hanger is easier to install on-site and provides a more reliable seal compared to the self-activated slip hanger.

[0003] However, with the gradual deterioration of geological conditions in oilfield production and the requirements of some high-standard wellhead conditions, higher performance requirements have been put forward for casing heads, especially casing hanger equipment. At present, no domestic or foreign wellhead manufacturers have a slip hanger that meets the performance requirements of PR2F. Therefore, a self-weight excitation slip hanger with PR2F structure for casing heads has been developed and designed. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of the embodiments of the present invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this section, the abstract and title of the invention. Such simplifications or omissions shall not be used to limit the scope of the present invention.

[0005] In view of the problems existing in the above and / or prior art, the present invention is proposed.

[0006] Therefore, the technical problem to be solved by the present invention is that the existing slip teeth have poor synchronization in the slip housing and are inconvenient to assemble into the slip housing.

[0007] To solve the above technical problems, the present invention provides the following technical solution: a self-weight-excited slip hanger with a PR2F structure for a casing head, comprising a support assembly, wherein the support assembly includes a support base, a seal and a gasket, the seal being disposed on the support base and the gasket being disposed on the seal; A slip assembly, comprising a slip housing and slip teeth, wherein the slip housing has a conical hole and the slip teeth are disposed in the conical hole; The support assembly is fixed to the housing of the cladding via connectors.

[0008] As a preferred embodiment of the PR2F structure for the sleeve head of the present invention, the slip hanger is provided with a groove on the outer side of the slip tooth, and a slider ring is provided in the groove.

[0009] As a preferred embodiment of the PR2F structure for the casing head of the present invention, the tapered hole sidewall is provided with a side groove, and the slider is embedded in the side groove.

[0010] As a preferred embodiment of the PR2F structure self-weight excitation slip hanger for the sleeve head described in this invention, wherein: a positioning screw is provided on the slip housing, and the positioning screw passes through the slip housing and connects to the slip teeth.

[0011] As a preferred embodiment of the PR2F structure self-weight excitation slip hanger for the sleeve head described in this invention, the slip housing includes a first half-shell and a second half-shell, the first half-shell is provided with a first arc groove, and a first locking shaft is provided in the first arc groove. The second half-shell is provided with a second arc groove, and a second retaining shaft is provided in the second arc groove.

[0012] As a preferred embodiment of the PR2F structure for the casing head of the present invention, the first clamping shaft includes a first half-shaft and a first hemisphere disposed at the end of the first half-shaft, wherein the cross-section of the first hemisphere and the first half-shaft are perpendicular.

[0013] As a preferred embodiment of the PR2F structure for the casing head of the present invention, the second clamping shaft includes a second half-shaft and a second hemisphere disposed at the end of the second half-shaft, and the cross sections of the second hemisphere and the second half-shaft are perpendicular.

[0014] As a preferred embodiment of the PR2F structure for the casing head of the present invention, the cross-sections of the first half-shaft and the second half-shaft are arranged facing each other, and the cross-sections of the first hemisphere and the second hemisphere are arranged facing each other.

[0015] As a preferred embodiment of the PR2F structure self-weight excitation slip hanger for the casing head described in this invention, it further includes a limiting block, wherein a first inclined groove is provided in the limiting block, and a second inclined groove is provided at the bottom of the first inclined groove; The first inclined groove has slots at both ends and a circular groove in the middle, with a fixing sleeve in the circular groove.

[0016] As a preferred embodiment of the PR2F structure self-weight excitation slip hanger for the casing head described in this invention, the sealing element includes a sealing ring and cover plates disposed on both sides of the sealing ring, and the sealing ring has a beveled cross-section.

[0017] The beneficial effects of this invention are: the internal slider ring better ensures the synchronization of the slips when they are in the hanger sleeve, and the setting of the limiting block allows the slip housing to be appropriately separated, which facilitates the assembly of the slip teeth into the slip housing. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 A schematic diagram of the overall structure of a weight-activated slip hanger with a PR2F structure for the casing head, provided by an embodiment of the present invention; Figure 2 A schematic diagram of the overall cross-sectional structure of a weight-excited slip hanger with a PR2F structure for a casing head, provided by an embodiment of the present invention; Figure 3 A schematic diagram of the slip teeth in a weight-activated slip hanger with a PR2F structure for the casing head, provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the overall exploded structure of a weight-activated slip hanger with a PR2F structure for the casing head, provided by an embodiment of the present invention. Figure 5 A schematic diagram of the first and second cladding shafts in a weight-activated slip hanger with a PR2F structure for the casing head, provided in an embodiment of the present invention; Figure 6 A schematic diagram of the limiting block in a weight-activated slip hanger with a PR2F structure for the casing head, provided in one embodiment of the present invention; Figure 7 A schematic diagram of the internal structure of the limiting block in a weight-activated slip hanger with a PR2F structure for the casing head, provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the sealing element in a weight-activated slip hanger with a PR2F structure for the sleeve head, as described in one embodiment of the present invention. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0021] Secondly, the present invention will be described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure will be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0022] Furthermore, the term "an 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 phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments.

[0023] Example 1 Reference Figures 1-8 This embodiment provides a weight-activated slip hanger with a PR2F structure for a casing head, comprising: a support assembly 100, which includes a support base 101, a seal 102, and a gasket 103, wherein the seal 102 is disposed on the support base 101 and the gasket 103 is disposed on the seal 102; and a slip assembly 200, which includes a slip housing 201 and slip teeth 202, wherein the slip housing 201 has a conical hole 201a and the slip teeth 202 are disposed in the conical hole 201a; and the support assembly 100 is fixed to the slip housing 201 by a connector.

[0024] Furthermore, a groove 202a is provided on the outer side of the slip tooth 202, and a slider ring 202b is provided in the groove 202a; a side groove 201b is provided on the side wall of the tapered hole 201a, and the slider ring 202b is embedded in the side groove 201b.

[0025] In this embodiment, the slip hanger of the present invention adopts a slider ring design inside, which better ensures the synchronization of the slips when hanging the sleeve. Compared with the traditional screw structure, the slips slide with better synchronization, ensuring uniform force on the outer wall of the sleeve and making the sleeve suspension more reliable.

[0026] The slip housing 201 is provided with a positioning screw 201c, which passes through the slip housing 201 and connects to the slip tooth 202.

[0027] It should be noted that there are multiple slip teeth 202, which are the same size and evenly distributed inside the slip housing 201.

[0028] As the locking teeth 202 slide downwards, under the structural action of the conical hole 201a, multiple locking teeth 202 converge towards the center, filling the gaps between them.

[0029] Furthermore, a gasket 103 is designed between the slip housing 201 and the seal 102. This gasket not only protects the sealing ring assembly but also prevents the slip from sliding excessively downwards, thus preventing damage to the sleeve. Adding the gasket improves the safety performance of the slip hanger during use. The slip housing 201 includes a first half-shell 201d and a second half-shell 201e. The first half-shell 201d is provided with a first arc groove 201d-1, and a first locking shaft 201d-2 is provided in the first arc groove 201d-1. The second half-shell 201e is provided with a second arc groove 201e-1, and a second locking shaft 201e-2 is provided in the second arc groove 201e-1.

[0030] The first half-shell 201d and the second half-shell 201e can be symmetrical structures. The hole structure provided on them for installing the positioning screws 201c is set as needed, specifically determined by the number of locking teeth and the number of positioning screws 201c installed.

[0031] Specifically, the first locking shaft 201d-2 includes a first half-shaft 201d-3 and a first hemisphere 201d-4 disposed at the end of the first half-shaft 201d-3, the cross-sections of the first hemisphere 201d-4 and the first half-shaft 201d-3 being perpendicular; the second locking shaft 201e-2 includes a second half-shaft 201e-3 and a second hemisphere 201e-4 disposed at the end of the second half-shaft 201e-3, the cross-sections of the second hemisphere 201e-4 and the second half-shaft 201e-3 being perpendicular.

[0032] Both the first hemisphere 201d-4 and the first half-shaft 201d-3 are half-structures, with their cross-sections being planes along their axial direction.

[0033] Furthermore, the cross-sections of the first half-shaft 201d-3 and the second half-shaft 201e-3 are arranged facing each other, and the cross-sections of the first hemisphere 201d-4 and the second hemisphere 201e-4 are arranged facing each other.

[0034] This allows the first half-shell 201d and the second half-shell 201e to combine into a complete circular shaft structure after splicing, and the first half-shaft 201d-3 and the second half-shaft 201e-3 to combine into a spherical structure.

[0035] Furthermore, it also includes a limiting block 203, in which a first inclined groove 203a is provided, and a second inclined groove 203b is provided at the bottom of the first inclined groove 203a; slots 203c are provided at both ends of the first inclined groove 203a, and a circular groove 203d is provided in the middle of the first inclined groove 203a, and a fixing sleeve 203e is provided in the circular groove 203d.

[0036] The limiting block 203 has an overall arc-shaped structure, which matches the structure of the first arc groove 201d-1 and the second arc groove 201e-1. The limiting block 203 has a first inclined groove 203a on its inner side. The bottom of the first inclined groove 203a has a second inclined groove 203b with a groove height higher than the first inclined groove 203a. It should be noted that the first inclined groove 203a is dimensionally matched with the first half-shaft 201d-3, and the first half-shaft 201d-3 can slide in the first inclined groove 203a. The second inclined groove 203b is dimensionally matched with the first hemisphere 201d-4, and the first hemisphere 201d-4 can slide in the second inclined groove 203b.

[0037] It should be noted that the first inclined groove 203a and the second inclined groove 203b are both located on the inner side of the edge of the limiting block 203 and on the outer side of the middle of the limiting block 203.

[0038] The limiting block 203 is embedded in the first arc groove 201d-1 and the second arc groove 201e-1 to connect the first locking shaft 201d-2 and the second locking shaft 201e-2, and to limit the relative position of the first half shell 201d and the second half shell 201e.

[0039] The fixing sleeve 203e is provided with a ball groove 203f. The fixing sleeve 203e is provided with a circular groove structure with a size smaller than the diameter of the ball groove 203f. The outer side of the circular groove structure is provided with a chamfer. The fixing sleeve 203e is used to fix the first hemisphere 201d-4 and the second hemisphere 201e-4 together.

[0040] Specifically, during installation, the first retaining shaft 201d-2 and the second retaining shaft 201e-2 are respectively inserted into the slots 203c located at both ends of the limiting block 203. Preferably, the first half-shell 201d and the second half-shell 201e are connected by two limiting blocks 203. Pushing the limiting blocks 203 will cause the first hemisphere 201d-4 and the second hemisphere 201e-4 to move along the second arc groove 201e-1, and the first half-shell 201d and the second half-shell 201e will move closer together. Simultaneously, the limiting block 203 is embedded into the first arc groove 201d-1 and the second arc groove 201e-1, and finally the first hemisphere 201d-4 and the second hemisphere 201e-4 are joined together and placed in the circular groove 203d. Then, the fixing sleeve 203e is squeezed into the circular groove 203d, so that the first hemisphere 201d-4 and the second hemisphere 201e-4 are squeezed into the ball groove 203f, thereby fixing the first hemisphere 201d-4 and the second hemisphere 201e-4.

[0041] The function of the limiting block 203 of the present invention is that it can maintain the relative position of the first half shell 201d and the second half shell 201e, which facilitates the installation of the locking tooth. After the locking tooth 202 is inserted into the conical hole 201a, the locking tooth 202 can be closed by pushing the first half shell 201d and the second half shell 201e towards the middle.

[0042] The sealing element 102 includes a sealing ring 102a and cover plates 102b disposed on both sides of the sealing ring 102a. The sealing ring 102a has a beveled cross section.

[0043] The seal 102 features an integral annular structure design. During the sealing process, the sealing area of ​​the seal 102 is evenly stressed, resulting in a more reliable seal. Furthermore, because the seal 102 is subjected to overall stress, the required sealing load is lower compared to other slip hangers, allowing the PR2F structure's self-weight-activated slip hanger to handle a wider range of suspension sleeve loads. Early establishment of the initial seal also enhances the safety performance of the sleeve hanger during use.

[0044] The sealing ring 102a of this invention has an interlaced cut, with the cut of the sealing ring 102a offset from the cuts of the slip housing 201, gasket 103, and support 101 at a certain angle. This design avoids the possibility of leakage from the cut position during PR2F high and low temperature tests. Compared to ordinary self-weight-excited slip hangers, this design enhances the sealing performance of the hanger under high and low temperature cycling conditions.

[0045] Furthermore, the seal 102 adopts a double-layer split-type cover plate design. A split-type metal cover plate 102b is vulcanized on the upper and lower surfaces and corners of the rubber sealing ring 102a. Simultaneously, another split-type metal cover plate 102b is assembled on the upper and lower surfaces on top of the first layer. When the slip hanger undergoes high and low temperature tests, because the slip hanger is split, there are large gaps at the split points, and there are also gaps between the slip hanger and the inner cavity of the sleeve head. The rubber of the seal 102 can easily penetrate into these gaps. When the rubber of the seal 102 is damaged, leakage is likely to occur first at these locations. The double-layer split-type cover plate design effectively prevents the sealing ring rubber from entering the gaps, thereby further enhancing the sealing performance of the hanger under high and low temperature cycling conditions.

[0046] Therefore, this invention can improve the sealing performance of the product, making the wellhead suitable for harsher geological mining environments, while ensuring that it is simple and easy to understand and operate, thereby greatly improving the assembly efficiency of the wellhead on site.

[0047] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0048] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0049] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0050] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A self-weight-excited slip hanger with a PR2F structure for casing heads, characterized in that: include, A support assembly (100) includes a support base (101), a seal (102), and a gasket (103). The seal (102) is disposed on the support base (101), and the gasket (103) is disposed on the seal (102). The slip assembly (200) includes a slip housing (201) and slip teeth (202), wherein a conical hole (201a) is provided in the slip housing (201) and the slip teeth (202) are disposed in the conical hole (201a); The slip housing (201) includes a first half-shell (201d) and a second half-shell (201e). A first arc groove (201d-1) is provided on the first half-shell (201d), and a first locking shaft (201d-2) is provided in the first arc groove (201d-1). The second half-shell (201e) is provided with a second arc groove (201e-1), and a second retaining shaft (201e-2) is provided in the second arc groove (201e-1). It also includes a limiting block (203), in which a first inclined groove (203a) is provided, and a second inclined groove (203b) is provided at the bottom of the first inclined groove (203a); The first inclined groove (203a) has slots (203c) at both ends, and a circular groove (203d) is provided in the middle of the first inclined groove (203a), and a fixing sleeve (203e) is provided in the circular groove (203d). The support assembly (100) is fixed to the slip housing (201) by a connector.

2. The self-weight-activated slip hanger with PR2F structure for casing head according to claim 1, characterized in that: The outer side of the locking tooth (202) is provided with a groove (202a), and a slider ring (202b) is provided in the groove (202a).

3. The self-weight-activated slip hanger with PR2F structure for casing head according to claim 2, characterized in that: The tapered hole (201a) has a side groove (201b) on its side wall, and the slider ring (202b) is embedded in the side groove (201b).

4. The self-weight-activated slip hanger with PR2F structure for casing head according to claim 3, characterized in that: The slip housing (201) is provided with a positioning screw (201c), which passes through the slip housing (201) and connects to the slip tooth (202).

5. The self-weight-activated slip hanger with PR2F structure for casing head according to claim 1, characterized in that: The first clasp (201d-2) includes a first half-shaft (201d-3) and a first hemisphere (201d-4) disposed at the end of the first half-shaft (201d-3), wherein the cross-sections of the first hemisphere (201d-4) and the first half-shaft (201d-3) are perpendicular.

6. The self-weight-activated slip hanger with PR2F structure for casing head according to claim 5, characterized in that: The second clasp (201e-2) includes a second half-shaft (201e-3) and a second hemisphere (201e-4) disposed at the end of the second half-shaft (201e-3), the cross sections of the second hemisphere (201e-4) and the second half-shaft (201e-3) being perpendicular.

7. The self-weight-excited slip hanger with PR2F structure for casing head according to claim 6, characterized in that: The cross-sections of the first half-shaft (201d-3) and the second half-shaft (201e-3) are set facing each other, and the cross-sections of the first hemisphere (201d-4) and the second hemisphere (201e-4) are set facing each other.

8. The self-weight-activated slip hanger with PR2F structure for casing head according to claim 1, characterized in that: The sealing element (102) includes a sealing ring (102a) and cover plates (102b) disposed on both sides of the sealing ring (102a). The sealing ring (102a) has a beveled cross section.

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