A high temperature hot oil production pipe head device for oil and gas trees

Abstract

The present invention discloses a high-temperature hot oil production pipe head device for oil and gas production trees, a tubing spool body, including a bottom secondary sealing assembly arranged at the lower part of the tubing spool body, a tubing hanger assembly arranged in the inner cavity of the tubing spool body, an upper flange arranged at the upper part of the tubing spool body with a cable passing through the tubing hanger assembly to replace the plug, a top screw assembly arranged on one side of the bottom secondary sealing assembly, a sleeve arranged in the inner cavity of the tubing spool body, and an oil pipe connected to the bottom of the tubing hanger assembly. The beneficial effects of the present invention are that reliable sealing is achieved through a simple structure, the manually stimulable seal can be re-stimulated and produce a reliable seal when leakage occurs, reliable sealing can be achieved at high temperatures by metal sealing and graphite sealing, and the cable sealing device also adopts a graphite sealing structure, which solves the problem that sealing cannot be achieved at high temperatures in the past, and further improves stability by adjusting the appropriate sealing pressure.

Description

Technical Field

[0001] The invention relates to the technical field of Christmas trees, in particular to a high-temperature hot oil production pipe head device for Christmas trees. Background Art

[0002] It mainly involves the oil extraction industry, especially the technical needs and development in the field of heavy oil extraction. Heavy oil, also known as heavy oil or high-viscosity oil, faces many challenges in extraction and transportation due to its high viscosity. Traditional extraction methods are often inefficient and costly. Therefore, it is particularly important to develop a technical device that can efficiently and safely extract heavy oil.

[0003] In this context, the development of high-temperature thermal recovery heavy oil tubing head devices for oil and gas trees came into being. This device effectively reduces the viscosity of heavy oil by using high-temperature thermal recovery technology (maximum temperature exceeds 400°C), thereby improving the recovery efficiency. At the same time, the device is also optimized for safety issues in the heavy oil recovery process to ensure the safety and reliability of the recovery process. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

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

[0006] Therefore, the object of the present invention is to provide a high temperature hot oil production pipe head device for oil and gas trees, which can manually stimulate the seal and produce a reliable seal again when leakage occurs, and solve the problem of high temperature failure to seal.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a tubing spool body, comprising a bottom secondary sealing assembly arranged inside the tubing spool body, a tubing hanger assembly arranged in the inner cavity of the tubing spool body, a cable passing substitute plug passing through the tubing hanger assembly, an upper flange arranged on the upper part of the tubing spool body, and a top screw assembly arranged on one side of the bottom secondary sealing assembly;

[0008] The oil pipe spool body is provided with an inner cavity adapted to the bottom secondary sealing assembly;

[0009] The tubing spool body also includes a pressure test hole for testing the pressure of the bottom secondary sealing assembly, a casing penetrating the inner cavity of the tubing spool body, and an oil pipe connected to the bottom of the tubing hanger assembly.

[0010] As a preferred solution of the high-temperature thermal oil production pipe head device for the oil and gas tree of the present invention, the bottom secondary sealing assembly includes a first pressure ring, a V-shaped metal ring arranged on the upper part of the first pressure ring, a support ring arranged on the upper part of the V-shaped metal ring, a first O-shaped sealing ring arranged on the outer ring of the support ring, a first FS sealing ring arranged on the inner side of the support ring, a V-shaped sealing step arranged at the bottom of the first pressure ring, and lifting threaded holes respectively arranged at the bottom of the first pressure ring and the upper part of the support ring.

[0011] As a preferred solution of the high-temperature hot oil production pipe head device for oil and gas trees of the present invention, the V-shaped metal ring includes a V-shaped metal gasket and a graphite material arranged inside the V-shaped metal gasket, and the V-shaped metal gasket can prevent the graphite material from loosening or collapsing.

[0012] As a preferred solution of the high-temperature thermal oil production pipe head device for oil and gas trees of the present invention, the tubing hanger assembly includes a tubing hanger body, a tightening nut symmetrically arranged on both sides of the tubing hanger body, a second pressure ring arranged on the upper part of the tightening nut, a metal sealing ring arranged on the upper part of the second pressure ring, a second FS sealing ring symmetrically arranged on both sides of the tubing hanger assembly, a first V-shaped graphite sealing ring symmetrically arranged on both sides of the tubing hanger assembly, a third pressure ring arranged on the upper part of the first V-shaped graphite sealing ring, a first retaining spring arranged on the upper part of the third pressure ring, a second V-shaped graphite sealing ring arranged on the outer wall of the extended diameter of the tubing hanger assembly, a second retaining spring arranged on the upper part of the second V-shaped graphite sealing ring, two groups of third FS sealing rings symmetrically arranged on both sides of the extended diameter of the tubing hanger assembly and evenly distributed and located on the upper part of the second retaining spring, a metal gasket arranged on the upper part of the extended diameter of the tubing hanger assembly, a third V-shaped graphite sealing ring arranged at the cable passing hole of the tubing hanger assembly, a fourth pressure ring arranged on the upper part of the third V-shaped graphite sealing ring, and a tightening screw threadedly connected to the fourth pressure ring;

[0013] The tightening nuts are symmetrically arranged on the outer wall of the tubing hanger body, the metal sealing ring is an inner and outer double-layer structure, and the tightening screw can stimulate the third V-shaped graphite sealing ring to improve the sealing effect.

[0014] As a preferred solution of the high-temperature thermal oil production pipe head device for oil and gas trees of the present invention, wherein: the oil pipe hanger body realizes combined sealing through the first V-shaped graphite sealing ring, the second FS sealing ring, the third pressure ring, and the first retaining spring;

[0015] The extended diameter of the tubing hanger assembly is combined and sealed by the second V-shaped graphite seal ring, the second retaining ring, the third FS seal ring, and the metal gasket;

[0016] The cable passing hole of the tubing hanger assembly is sealed by a third V-shaped graphite sealing ring, a fourth pressure ring, and a tightening screw.

[0017] As a preferred solution of the high-temperature hot oil production pipe head device for oil and gas trees of the present invention, the cable crossing substitute plug includes a cable crossing substitute plug body, and a plurality of groups of second O-type sealing rings evenly distributed on the outer wall of the cable crossing substitute plug body;

[0018] A fixed thread is arranged at the bottom of the cable crossing substitute plug for locking the cable crossing substitute plug body.

[0019] As a preferred solution of the high-temperature hot oil production pipe head device for oil and gas trees of the present invention, the upper flange includes an upper flange body, a fourth V-shaped graphite sealing ring arranged at the cable passing hole of the upper flange, a locking plate fixedly connected to the upper flange body, a locking bolt passing through the locking plate, and a locking nut threadedly connected to the locking bolt;

[0020] The inner cavity of the upper flange body is provided with a gasket groove matched with the fourth V-shaped graphite sealing ring and a rubber sealing step.

[0021] As a preferred solution of the high-temperature hot oil production pipe head device for oil and gas trees of the present invention, there are multiple groups of top screw assemblies distributed on the outer ring of the upper flange and the outer ring at the bottom of the oil pipe spool body;

[0022] The top screw assembly and the oil pipe cross body are both threadedly connected;

[0023] The pressure test hole comprises a first pressure test hole arranged on a side of the bottom secondary sealing assembly away from the top screw assembly, and a second pressure test hole arranged on a side of the tubing hanger assembly away from the first pressure test hole.

[0024] As a preferred solution of the high-temperature hot oil production pipe head device for oil and gas trees of the present invention, the third V-shaped graphite sealing ring includes a sealing ring support ring, a plurality of sealing ring bodies arranged on the upper part of the sealing ring support ring, a sealing ring pressure ring arranged on the upper part of the sealing ring body, and a disc spring arranged on the upper part of the sealing ring pressure ring;

[0025] The two ends of the disc spring are respectively connected to the top of the sealing ring pressure ring and the bottom of the fourth pressure ring. The disc spring can prevent the clamping screw from loosening. By turning the clamping screw, the fourth pressure ring is driven to move downward, thereby compressing the disc spring and the sealing ring body to achieve further sealing.

[0026] Beneficial effects of the present invention: The present invention achieves reliable sealing through a simple structure. The manually stimulable seal can be re-stimulated to produce a reliable seal when leakage occurs. Reliable sealing can be achieved at high temperatures through metal sealing and graphite sealing. The cable sealing device also adopts a graphite sealing structure, which solves the problem that sealing cannot be achieved at high temperatures in the past, and further improves stability by adjusting the appropriate sealing pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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 labor. Among them:

[0028] Figure 1 Schematic diagram of the installation and pressure test of the tubing head device of the high-temperature hot oil production tubing head device for the oil and gas tree.

[0029] Figure 2 The schematic diagram of the overall structure of the high-temperature hot oil production pipe head device for the oil and gas tree is shown in the cross-sectional view.

[0030] Figure 3 High temperature hot oil production pipe head device for oil and gas trees Figure 2 Enlarged schematic diagram at point A in the middle.

[0031] Figure 4 High temperature hot oil production pipe head device for oil and gas trees Figure 2 Enlarged schematic diagram of point B in the middle.

[0032] Figure 5 Schematic diagram of the cable crossing replacement plug structure for the high-temperature hot oil production pipe head device for oil and gas trees.

[0033] Figure 6 The schematic diagram of the overall structure of the high-temperature hot oil production pipe head device for the oil and gas tree is shown in the cross-sectional view.

[0034] Figure 7 High temperature hot oil production pipe head device for oil and gas trees Figure 6 Enlarged schematic diagram at point C in the middle.

[0035] Figure 8 High temperature hot oil production pipe head device for oil and gas trees Figure 6 Enlarged schematic diagram at point D in the middle.

[0036] Fig. 9 This is a schematic diagram of the structure of the first FS sealing ring of the high-temperature hot oil production pipe head device for oil and gas trees.

[0037] Fig.10 This is a schematic diagram of the V-shaped metal ring structure of a high-temperature hot oil production pipe head device for an oil and gas tree.

[0038] Fig.11 This is a schematic diagram of the implementation structure of the third V-shaped graphite sealing ring of the high-temperature thermal oil production pipe head device for oil and gas trees.

[0039] Figure numbers: 100, tubing spool body; 101, bottom secondary sealing assembly; 102, tubing hanger assembly; 103, cable crossing alternative plug; 104, upper flange; 105, top screw assembly; 106, pressure test hole; 107, casing; 108, tubing; 101a, first pressure ring; 101b, V-shaped metal ring; 101c, support ring; 101d, first O-type sealing ring; 101e, first FS sealing ring; 101f, V-shaped sealing step; 101g, lifting threaded hole; 101b-1, V-shaped metal gasket; 101b-2, graphite material; 102a, tubing hanger body; 102b, tightening nut; 102c, second pressure ring; 102d, metal sealing ring; 102e, second FS sealing ring; 102f, first V-shaped graphite sealing ring; 102g, third pressure ring Ring; 102h, first retaining spring; 102i, second V-type graphite sealing ring; 102j, second retaining spring; 102k, third FS sealing ring; 102l, metal gasket; 102m, V-type graphite sealing ring; 102n, fourth pressure ring; 102o, clamping screw; 103a, cable crossing replacement plug body; 103b, second O-type sealing ring; 104a, upper flange body; 104b, fourth V-type graphite sealing ring; 104c, locking pressure plate; 104d, locking bolt; 104e, locking nut; 106a, first pressure test hole; 106b, second pressure test hole; 101e-1, metal support ring; 101e-2, FS high saturation sealing ring; 102m-1, sealing ring support ring; 102m-2, sealing ring body; 102m-3, sealing ring pressure ring; 102m-4, disc spring. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Example 1, reference Figures 1 to 8, which is the first embodiment of the present invention, provides a high-temperature thermal oil production pipe head device for an oil and gas tree, which includes a bottom secondary sealing component 101, a tubing hanger component 102, a cable crossing replacement plug 103, an upper flange 104, a top screw component 105, a pressure test hole 106, a casing 107 and an oil pipe 108. It can be manually stimulated to seal and can be re-stimulated to produce a reliable seal when leakage occurs, and solves the problem of being unable to seal at high temperature.

[0044] Specifically, the tubing spool body 100 includes a bottom secondary sealing assembly 101 disposed inside the tubing spool body 100, a tubing hanger assembly 102 disposed in the inner cavity of the tubing spool body 100, a cable passing substitute plug 103 passing through the tubing hanger assembly 102, an upper flange 104 disposed on the upper part of the tubing spool body 100, and a top screw assembly 105 disposed on one side of the bottom secondary sealing assembly 101;

[0045] The oil pipe spool body 100 is provided with an inner cavity adapted to the bottom secondary sealing assembly 101;

[0046] The tubing spool body 100 further includes a pressure test hole 106 for testing the pressure of the bottom secondary sealing assembly 101, a sleeve 107 penetrating the inner cavity of the tubing spool body 100, and an oil pipe 108 connected to the bottom of the tubing hanger assembly 102;

[0047] The tubing hanger assembly 102 is disposed on the upper portion of the bottom secondary sealing assembly 101 .

[0048] Furthermore, the bottom secondary sealing assembly 101 includes a first pressure ring 101a, a V-shaped metal ring 101b arranged on the upper part of the first pressure ring 101a, a support ring 101c arranged on the upper part of the V-shaped metal ring 101b, a first O-shaped sealing ring 101d arranged on the outer circle of the support ring 101c, a first FS sealing ring 101e arranged on the inner side of the support ring 101c, a V-shaped sealing step 101f arranged at the bottom of the first pressure ring 101a, and lifting threaded holes 101g respectively arranged at the bottom of the first pressure ring 101a and the upper part of the support ring 101c, and the V-shaped recesses of the V-shaped metal ring 101b are respectively embedded in the upper part of the first pressure ring 101a and the lower part of the support ring 101c.

[0049] Furthermore, the V-shaped metal ring 101b includes a V-shaped metal gasket 101b-1 and a graphite material 101b-2 disposed inside the V-shaped metal gasket 101b-1. The V-shaped metal gasket 101b-1 can prevent the graphite material 101b-2 from loosening or collapsing, thereby ensuring sealing performance.

[0050] Furthermore, the tubing hanger assembly 102 includes a tubing hanger body 102a, tightening nuts 102b symmetrically arranged on both sides of the tubing hanger body 102a, a second pressure ring 102c arranged on the upper part of the tightening nut 102b, a metal sealing ring 102d arranged on the upper part of the second pressure ring 102c, a second FS sealing ring 102e symmetrically arranged on both sides of the tubing hanger assembly 102, a first V-shaped graphite sealing ring 102f symmetrically arranged on both sides of the tubing hanger assembly 102, a third pressure ring 102g arranged on the upper part of the first V-shaped graphite sealing ring 102f, a first retaining spring 102h arranged on the upper part of the third pressure ring 102g, and a second FS sealing ring 102e symmetrically arranged on both sides of the tubing hanger assembly 102. A second V-shaped graphite seal ring 102i on the outer wall of the extended diameter of the hanger assembly 102, a second retaining ring 102j arranged on the upper part of the second V-shaped graphite seal ring 102i, two sets of third FS seal rings 102k symmetrically arranged on both sides of the extended diameter of the tubing hanger assembly 102 and evenly distributed and located on the upper part of the second retaining ring 102j, a metal gasket 102l arranged on the upper part of the extended diameter of the tubing hanger assembly 102, a third V-shaped graphite seal ring 102m arranged at the cable passing hole of the tubing hanger assembly 102, a fourth pressure ring 102n arranged on the upper part of the third V-shaped graphite seal ring 102m, and a clamping screw 102o threadedly connected to the fourth pressure ring 102n;

[0051] The tightening nut 102b is symmetrically arranged on the outer wall of the tubing hanger body 102a, the metal sealing ring 102d is an inner and outer double-layer structure, and the tightening screw 102o can stimulate the third V-shaped graphite sealing ring 102m to improve the sealing effect.

[0052] Further, the tubing hanger body 102a realizes combined sealing through the first V-shaped graphite sealing ring 102f, the second FS sealing ring 102e, the third pressure ring 102g, and the first retaining spring 102h;

[0053] The extended diameter of the tubing hanger assembly 102 is formed by a second V-shaped graphite seal ring 102i, a second retaining spring 102j, a third FS seal ring 102k, and a metal gasket 102l to ensure the sealing performance of the extended neck;

[0054] The cable passing hole of the tubing hanger assembly 102 is sealed by a third V-shaped graphite seal ring 102m, a fourth pressure ring 102n, and a clamping screw 102o;

[0055] The upper flange 104 is driven downward to move under the pressure 1 provided by tightening the fastening bolts on the outer ring of the upper flange 104, the top screw assembly 105 contacts the third pressure ring 102g, the third pressure ring 102g squeezes the first V-shaped graphite sealing ring 102f under the pressure 2, and the pressure 3 provided by the deadweight of the oil pipe causes the metal sealing ring 102d of the inner and outer double-layer structure to be squeezed and deformed, thereby achieving good sealing performance.

[0056] Furthermore, the cable crossing substitute plug 103 comprises a cable crossing substitute plug body 103a, and a plurality of groups of second O-rings 103b disposed on the outer wall of the cable crossing substitute plug body 103a and evenly distributed longitudinally;

[0057] A fixing thread is provided at the bottom of the cable passing substitute plug 103 for locking the cable passing substitute plug body 103a.

[0058] Further, the upper flange 104 includes an upper flange body 104a, a fourth V-shaped graphite sealing ring 104b disposed at the cable passing hole of the upper flange 104, a locking plate 104c fixedly connected to the upper flange body 104a, a locking bolt 104d passing through the locking plate 104c, and a locking nut 104e threadedly connected to the locking bolt 104d;

[0059] The inner cavity of the upper flange 104 is provided with a gasket groove and a rubber sealing step adapted to the fourth V-shaped graphite sealing ring 104b.

[0060] Further, there are multiple groups of top screw assemblies 105 distributed on the outer ring of the upper flange 104 and the outer ring at the bottom of the oil pipe spool body 100;

[0061] The top screw assembly 105 and the oil pipe spool body 100 are both threadedly connected;

[0062] The pressure test hole 106 includes a first pressure test hole 106a disposed on a side of the bottom secondary sealing assembly 101 away from the top screw assembly 105, and a second pressure test hole 106b disposed on a side of the tubing hanger assembly 102 away from the first pressure test hole 106a.

[0063] Further, the third V-shaped graphite sealing ring 102m includes a sealing ring support ring 102m-1, a plurality of sealing ring bodies 102m-2 arranged on the upper part of the sealing ring support ring 102m-1, a sealing ring pressure ring 102m-3 arranged on the upper part of the sealing ring body 102m-2, and a disc spring 102m-4 arranged on the upper part of the sealing ring pressure ring 102m-3;

[0064] The two ends of the disc spring 102m-4 are respectively connected to the top of the sealing ring pressure ring 102m-3 and the bottom of the fourth pressure ring 102n. The disc spring 102m-4 can prevent the clamping screw 102o from loosening. By turning the clamping screw 102o, the fourth pressure ring 102n is driven to move downward, thereby compressing the disc spring 102m-4 and the sealing ring body 102m-2 to achieve further sealing.

[0065] It should be noted that a step adapted to the tubing hanger assembly 102 is provided at the upper portion of the inner cavity of the tubing spool body 100 .

[0066] When in use, the bottom of the tubing spool body 100 is provided with a bottom secondary sealing assembly 101 for separating the annular space pressure of the tubing 108. The bottom secondary sealing assembly 101 is activated by using the first FS sealing ring 101e and one end of the manually adjustable top screw assembly 105 to touch the top of the first pressing ring 101a to stimulate the V-shaped metal ring 101b. The arc surface of one end of the top screw assembly 105 squeezes the bottom of the first pressing ring 101a, so that the first pressing ring 101a is closely fitted with the V-shaped metal ring 101b, the support ring 101c, and the first FS sealing ring 101e to achieve combined sealing. The combined sealing form is more reliable and has a stronger sealing effect. The outer wall of the bottom secondary sealing assembly 101 is double-sealed by the combination of the graphite material 101b-2 and the first O-ring 101d, so that the outer wall of the bottom secondary sealing assembly 101 is closely fitted with the tubing spool body 100.

[0067] The main seal of the tubing hanger assembly 102 uses a double C-type metal seal, a second FS seal ring 102e to achieve a rubber seal, and a first V-type graphite seal ring 102f that can be manually activated by a top screw assembly 105 to achieve a combined seal;

[0068] The extended diameter auxiliary seal of the tubing hanger assembly 102 adopts a stacked combination seal of multiple sets of second V-shaped graphite seal rings 102i, evenly distributed FS-type seal rings 101e and a gasket-type metal seal.

[0069] The cable crossing hole of the tubing hanger assembly 102 adopts a second O-ring 103b to achieve a tight seal between the cable crossing substitute plug 103 and the inner cavity of the tubing cross body 100, and is combined and sealed by stacking a plurality of groups of third V-shaped graphite sealing rings 102m that can be manually activated by using a top screw assembly 105. The third V-shaped graphite sealing ring 102m is combined by stacking a sealing ring support ring 102m-1, a plurality of groups of sealing ring bodies 102m-2, and a sealing ring pressure ring 102m-3, and a disc spring 102n-4 is used to prevent the clamping screw 102o from loosening, and the fourth pressure ring 102n is driven to move downward by turning the clamping screw 102o, thereby compressing the disc spring 102m-4 and the sealing ring body 102m-2 to achieve further sealing;

[0070] The upper flange 104 is driven downward to move under the pressure 1 provided by tightening the fastening bolts on the outer ring of the upper flange 104, the top screw assembly 105 contacts the third pressure ring 102g, the third pressure ring 102g squeezes the first V-shaped graphite sealing ring 102f under the pressure 2, and the pressure 3 provided by the deadweight of the oil pipe causes the metal sealing ring 102d of the inner and outer double-layer structure to be squeezed and deformed, thereby achieving good sealing performance.

[0071] In summary, the present invention achieves reliable sealing through a simple structure. The manually stimulable seal can be re-stimulated to produce a reliable seal when leakage occurs. Reliable sealing can be achieved at high temperatures through metal sealing and graphite sealing. The cable sealing device also adopts a graphite sealing structure, which solves the problem of being unable to seal at high temperatures in the past, and further improves stability by adjusting the appropriate sealing pressure.

[0072] Example 2, reference Figure 8 , which is the second embodiment of the present invention, provides a high-temperature hot oil production pipe head device for an oil and gas tree, which can further improve the sealing performance through a top screw assembly 105.

[0073] One end of the top screw assembly 105 is a conical surface, and multiple groups of top screw assemblies 105 are distributed on the outer circumference of the flange. The head of the top screw assembly 105 is rotated clockwise and moves toward the inner cavity of the tubing cross body 100 through the transmission thread. The conical surface of the head of the top screw assembly 105 converts part of the force into an upward or downward extrusion force, which squeezes the first pressure ring 101a so that the first pressure ring 101a also moves upward or downward according to the direction of the received pressure, thereby further improving the sealing performance.

[0074] In summary, the conical surface at one end of the top screw assembly can be converted into upward or downward pressure as the thread moves inward through the conical surface, and the pressing ring is squeezed to reduce the gap between the pressing rings as much as possible to further improve the sealing effect and achieve a tight seal.

[0075] Importantly, it should be noted that the construction and arrangement of the present application shown in a number 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 without substantially departing from the novel teachings and advantages of the subject matter described in the application (e.g., mounting arrangements, use of materials, color, changes in orientation, etc.). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete element may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to an alternative embodiment. In the claims, any "device plus function" clause is intended to cover the structure of the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to a variety of modifications that still fall within the scope of the appended claims.

[0076] Additionally, in an effort to provide a concise description of example embodiments, all features of an actual implementation may not be described.

[0077] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0078] 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. A high temperature hot oil production pipe head device for an oil and gas tree, characterized in that: include, An oil pipe spool body (100) comprises a bottom secondary sealing assembly (101) arranged in the inner cavity of the oil pipe spool body (100), an oil pipe hanger assembly (102) arranged in the inner cavity of the oil pipe spool body (100), a cable passing substitute plug (103) passing through the oil pipe hanger assembly (102), an upper flange (104) arranged on the upper part of the oil pipe spool body (100), and a top screw assembly (105) arranged on one side of the bottom secondary sealing assembly (101); The oil pipe spool body (100) is provided with an inner cavity adapted to the bottom secondary sealing component (101); The tubing spool body (100) further comprises a pressure test hole (106) for testing the pressure of the bottom secondary sealing assembly (101), a sleeve (107) passing through the inner cavity of the tubing spool body (100), and an oil pipe (108) connected to the bottom of the tubing hanger assembly (102); The bottom secondary sealing assembly (101) comprises a first pressure ring (101a), a V-shaped metal ring (101b) arranged on the upper part of the first pressure ring (101a), a support ring (101c) arranged on the upper part of the V-shaped metal ring (101b), a first O-shaped sealing ring (101d) arranged on the outer circle of the support ring (101c), a first FS sealing ring (101e) arranged on the inner side of the support ring (101c), a V-shaped sealing step (101f) arranged at the bottom of the first pressure ring (101a), and lifting threaded holes (101g) respectively arranged at the bottom of the first pressure ring (101a) and the upper part of the support ring (101c); The V-shaped metal ring (101b) comprises a V-shaped metal gasket (101b-1) and a graphite material (101b-2) arranged inside the V-shaped metal gasket (101b-1), wherein the V-shaped metal gasket (101b-1) can prevent the graphite material (101b-2) from loosening or collapsing; The tubing hanger assembly (102) comprises a tubing hanger body (102a), a tightening nut (102b) symmetrically arranged on both sides of the tubing hanger body (102a), a second pressure ring (102c) arranged on the upper part of the tightening nut (102b), a metal sealing ring (102d) arranged on the upper part of the second pressure ring (102c), a second FS sealing ring (102e) symmetrically arranged on both sides of the tubing hanger assembly (102), a first V-shaped graphite sealing ring (102f) symmetrically arranged on both sides of the tubing hanger assembly (102), a third pressure ring (102g) arranged on the upper part of the first V-shaped graphite sealing ring (102f), a first retaining ring (102h) arranged on the upper part of the third pressure ring (102g), and a second FS sealing ring (102e) symmetrically arranged on both sides of the tubing hanger assembly (102). A second V-shaped graphite sealing ring (102i) on the outer wall of the extended diameter of the hanger assembly (102), a second retaining spring (102j) arranged on the upper part of the second V-shaped graphite sealing ring (102i), two sets of third FS sealing rings (102k) symmetrically arranged on both sides of the extended diameter of the tubing hanger assembly (102) and evenly distributed and located on the upper part of the second retaining spring (102j), a metal gasket (102l) arranged on the upper part of the extended diameter of the tubing hanger assembly (102), a third V-shaped graphite sealing ring (102m) arranged at the cable passing hole of the tubing hanger assembly (102), a fourth pressing ring (102n) arranged on the upper part of the third V-shaped graphite sealing ring (102m), and a clamping screw (102o) threadedly connected to the fourth pressing ring (102n); The tightening nut (102b) is symmetrically arranged on the outer wall of the tubing hanger body (102a); the metal sealing ring (102d) is an inner and outer double-layer structure; and the clamping screw (102o) can stimulate the third V-shaped graphite sealing ring (102m) to improve the sealing effect.

2. The high temperature hot oil production pipe head device for an oil and gas tree according to claim 1, characterized in that: The tubing hanger body (102a) realizes combined sealing through the first V-shaped graphite sealing ring (102f), the second FS sealing ring (102e), the third pressure ring (102g), and the first retaining spring (102h); The extended diameter of the tubing hanger assembly (102) is combinedly sealed by the second V-shaped graphite sealing ring (102i), the second retaining spring (102j), the third FS sealing ring (102k), and the metal gasket (102l); The cable passing hole of the oil pipe hanger assembly (102) is used to achieve combined sealing through the third V-shaped graphite sealing ring (102m), the fourth pressure ring (102n), and the clamping screw (102o).

3. The high temperature hot oil production pipe head device for an oil and gas tree according to claim 2, characterized in that: The cable crossing alternative plug (103) comprises a cable crossing alternative plug body (103a), and a plurality of groups of second O-rings (103b) evenly distributed on the outer wall of the cable crossing alternative plug body (103a); A fixing thread is provided at the bottom of the cable crossing alternative plug (103) for locking the cable crossing alternative plug body (103a).

4. The high temperature hot oil production pipe head device for an oil and gas tree according to claim 3, characterized in that: The upper flange (104) comprises an upper flange body (104a), a fourth V-shaped graphite sealing ring (104b) arranged at the cable passing hole of the upper flange (104), a locking pressure plate (104c) fixedly connected to the upper flange body (104a), a locking bolt (104d) passing through the locking pressure plate (104c), and a locking nut (104e) threadedly connected to the locking bolt (104d); The inner cavity of the upper flange (104) is provided with a gasket groove and a rubber sealing step adapted to the fourth V-shaped graphite sealing ring (104b).

5. The high temperature hot oil production pipe head device for an oil and gas tree according to claim 4, characterized in that: The top screw assemblies (105) are distributed in multiple groups on the outer ring of the upper flange (104) and the outer ring at the bottom of the oil pipe spool body (100); The jack screw assembly (105) and the oil pipe spool body (100) are both threadedly connected; The pressure test hole (106) comprises a first pressure test hole (106a) arranged on a side of the bottom secondary sealing assembly (101) away from the top screw assembly (105), and a second pressure test hole (106b) arranged on a side of the tubing hanger assembly (102) away from the first pressure test hole (106a).

6. The high temperature hot oil production pipe head device for an oil and gas tree according to claim 5, characterized in that: The third V-shaped graphite sealing ring (102m) comprises a sealing ring support ring (102m-1), a plurality of sealing ring bodies (102m-2) arranged on the upper part of the sealing ring support ring (102m-1), a sealing ring pressure ring (102m-3) arranged on the upper part of the sealing ring body (102m-2), and a disc spring (102m-4) arranged on the upper part of the sealing ring pressure ring (102m-3); The first FS sealing ring (101e) comprises a metal support ring (101e-1) and a FS high saturation sealing ring (101e-2) arranged on the outer wall of the metal support ring (101e-1), so as to ensure that the first FS sealing ring (101e) will not tear when subjected to pressure; The two ends of the disc spring (102m-4) are respectively connected to the top of the sealing ring pressure ring (102m-3) and the bottom of the fourth pressure ring (102n); the disc spring (102m-4) can prevent the clamping screw (102o) from loosening, and the fourth pressure ring (102n) is driven to move downward by turning the clamping screw (102o), thereby compressing the disc spring (102m-4) and the sealing ring body (102m-2) to achieve further sealing.

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