CN220748212U

CN220748212U - Gas well wellhead sealing device

Info

Publication number: CN220748212U
Application number: CN202322401323.9U
Authority: CN
Inventors: 屈孝和; 袁博阳; ***
Original assignee: Xian Sitan Apparatus Co Ltd
Current assignee: Xian Sitan Apparatus Co Ltd
Priority date: 2023-09-05
Filing date: 2023-09-05
Publication date: 2024-04-09
Anticipated expiration: 2033-09-05

Abstract

Embodiments of the present disclosure relate to a gas well wellhead sealing device, comprising: the first pipe body is in sealing connection with an interface extending out of a power cable in a tee joint of the wellhead of the gas well; the first sealing component is arranged in the joint of the interface and the first pipe body; the cable sequentially passes through the first sealing assembly and the first pipe body; the second sealing assembly is connected with the first pipe body in a sealing way, and a wire and a cable at one end inside the second sealing assembly are connected; and the outer joint assembly is connected with the second sealing assembly, and a ground wire in the outer joint assembly is connected with a wire at the other end in the second sealing assembly. In the embodiment, the wellhead sealing of the tee joint is realized by arranging the first sealing assembly and the first pipe body, so that the damage to the tee joint is effectively reduced; the connection between the lead and the cable is realized through the second sealing component, so that the circuit is prevented from being exposed; and the outer joint assembly is used for sealing the ground electric wire end, so that the sealing effect is achieved.

Description

Gas well wellhead sealing device

Technical Field

The embodiment of the disclosure relates to the technical field of wellhead sealing, in particular to a wellhead sealing device of a gas well.

Background

With the deep development of oil reservoir exploration, the proportion of low permeability oil reservoir reserves is continuously increased, and efficient and reasonable development of low permeability oil reservoirs is becoming increasingly important. The viscosity of crude oil can be effectively reduced by injecting high-pressure gas into the ground, the fluidity ratio is improved, and the interfacial tension is reduced, so that the gas injection can effectively develop a low-permeability oil reservoir, and has important significance for oil field development.

The underground instruments need ground power supply and real-time feedback of temperature and pressure data acquired by the underground instruments, and the underground instruments need to be led into the well from a well head, so that the problem of sealing and blowout prevention of the well head needs to be considered.

In the related art, the wellhead tee joint is welded by adopting alloy steel, and is usually sealed by directly enclasping the tee joint by adopting a conical thread, so that the sealing pressure-bearing performance of the wellhead tee joint is poor after the wellhead tee joint is used for many times, and the wellhead tee joint is damaged.

Accordingly, there is a need to improve one or more problems in the related art as described above.

It is noted that this section is intended to provide a background or context for the technical solutions of the present disclosure as set forth in the claims. The description herein is not admitted to be prior art by inclusion in this section.

Disclosure of Invention

It is an object of embodiments of the present disclosure to provide a gas well wellhead sealing device that overcomes, at least in part, one or more of the problems due to the limitations and disadvantages of the related art.

The embodiment of the disclosure provides a gas well wellhead sealing device, comprising:

the first pipe body is in sealing connection with an interface extending out of a power cable in a tee joint of the wellhead of the gas well;

a first seal assembly disposed within a junction of the interface and the first tubular body; the cable sequentially passes through the first sealing assembly and the first pipe body;

the second sealing assembly is in sealing connection with the first pipe body, and a wire at one end inside the second sealing assembly is connected with the cable;

and the outer joint assembly is connected with the second sealing assembly, and a ground wire in the outer joint assembly is connected with a wire at the other end in the second sealing assembly.

In an embodiment of the disclosure, a metal gasket is disposed between the first tube and the interface.

In an embodiment of the disclosure, the first sealing component includes a compression screw, a metal cone sealing element and a sealing ring, the compression screw and the interface are sealed by the sealing ring, and the compression screw is provided with the metal cone sealing element.

In one embodiment of the disclosure, the cable is stripped or stripped of the outer skin of the steel tube 5-10 cm from the metallic cone seal.

In an embodiment of the disclosure, the second sealing component comprises a sealing plug and a sealing joint, the sealing plug is arranged on the sealing joint, both ends of the sealing plug are connected with wires, one end of the sealing joint is connected with the first pipe body, and the other end of the sealing joint is connected with the second pipe body.

In an embodiment of the disclosure, the connection relationship between the wire and the sealing plug is welding.

In an embodiment of the disclosure, the external joint assembly includes an external pressure joint and an external pressure sleeve, the external pressure joint is connected with the second pipe body, and the external pressure sleeve is sleeved at the end of the external pressure joint.

In an embodiment of the disclosure, the external pressure joint and the external pressure sleeve are sealed by a sealing colloid.

In an embodiment of the disclosure, the ground wire is fixed in position by the sealant.

In an embodiment of the disclosure, the connection relationship between the second pipe body and the first pipe body is threaded connection.

The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects:

according to the wellhead sealing device for the gas well, disclosed by the embodiment of the utility model, the wellhead sealing of the tee joint is realized by arranging the first sealing assembly and the first pipe body, so that the damage to the tee joint is effectively reduced; the connection between the lead and the cable is realized through the second sealing component, so that the circuit is prevented from being exposed, and the sealing effect is achieved; and the outer joint assembly is used for sealing the ground electric wire end, so that the sealing effect is achieved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.

FIG. 1 illustrates a schematic structural view of a gas well wellhead sealing device in an exemplary embodiment of the present disclosure;

FIG. 2 illustrates a schematic of the positional relationship of a gas well wellhead seal and a wellhead tee in an exemplary embodiment of the present disclosure.

Reference numerals:

C. an interface; D. a gas well wellhead sealing device; 1. a compression screw; 2. a metal gasket; 3. a metal cone seal; 4. a first tube body; 5. a sealing plug; 6. sealing the joint; 7. a second tube body; 8. an external pressure joint; 9. sealing colloid; 10. and (5) externally pressing the sleeve.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Furthermore, the drawings are merely schematic illustrations of embodiments of the disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities.

In this example embodiment, a gas well wellhead sealing device D is provided, and referring to fig. 1 and 2, may include: a first tubular body 4, a first seal assembly, a second seal assembly and an outer joint assembly.

Specifically, the first pipe body 4 is in sealing connection with an interface C extending out of a power cable in a tee joint of a wellhead of the gas well. The wellhead tee joint can be formed by integrally forging stainless steel, and the pressure-resistant reliability and the corrosion-resistant performance are remarkably improved.

The first sealing component is arranged inside the joint of the interface C and the first pipe body 4. The cable passes through the first sealing assembly and the first pipe body 4 in turn and out from the first pipe body 4.

The second sealing component is in sealing connection with the first pipe body 4, and a wire at one end inside the second sealing component is connected with the cable.

The outer joint component is connected with the second sealing component, and a ground wire in the outer joint component is connected with a wire at the other end in the second sealing component.

In the embodiment, the wellhead sealing of the tee joint is realized by arranging the first sealing assembly and the first pipe body 4, so that the damage to the tee joint is effectively reduced; the connection between the lead and the cable is realized through the second sealing component, so that the circuit is prevented from being exposed, and the sealing effect is achieved; and the outer joint assembly is used for sealing the ground electric wire end, so that the sealing effect is achieved.

Optionally, in some embodiments, a metal gasket 2, for example, a 316L metal gasket 2, is disposed between the first pipe body 4 and the interface C, and the metal gasket 2 is used to seal the two, so as to effectively reduce damage to the tee.

Optionally, in some embodiments, the first sealing assembly includes a compression screw 1, a metal cone seal 3, and a sealing ring, the compression screw 1 and the interface C are sealed by using the sealing ring, and the metal cone seal 3 is disposed on the compression screw 1. Wherein the compression screw 1 may be a straight thread type. The compression screw 1 is connected with the connector C in a common thread and sealing ring mode, and a metal cone sealing mode is adopted to fix the cable in the tee joint and plays a role in primary sealing. Leading out the cable from the side hole of the wellhead tee joint interface C, enabling the compression screw 1 and the metal cone sealing piece 3 to penetrate through the cable, screwing the compression screw 1 and the wellhead tee joint C, screwing the metal cone sealing piece 3 and the compression screw 1, achieving the purpose that the metal cone sealing piece 3 is extruded and deformed, and tightly holding the cable to achieve metal sealing of the cable.

Alternatively, in some embodiments, the outer skin of the steel tube of the cable outside the position about 5cm to 10cm away from the metal cone sealing member 3 is in a stripped or stripped state, the copper core of the steel tube is exposed, and 2 cm to 4cm of copper core can be reserved for connection with a wire.

Optionally, in some embodiments, the second sealing assembly comprises a sealing plug 5 and a sealing joint 6, the sealing plug 5 being arranged on the sealing joint 6. Both ends of the sealing plug 5 are connected with wires. One end of the sealing joint 6 is connected with the first pipe body 4, and the other end is connected with the second pipe body 7. Specifically, the left end of the sealing plug 5 is welded with a wire, the length of the wire is kept to be 10-15 cm, the welding point at the left end of the sealing plug 5 is wound and sealed by using a high-pressure self-adhesive tape, the right end of the sealing plug 5 is welded with the wire, the length of the wire is kept to be 15-18 cm, the sealing plug 5 is screwed with the sealing joint 6, the wire at the left end of the sealing plug 5 is welded with copper cores of 2-4 cm of a cable, and the copper cores are wound and tightly by using the self-adhesive tape, and all the copper cores are required to be wound.

Optionally, in some embodiments, the external joint assembly includes an external pressure joint 8 and an external pressure sleeve 10, where the external pressure joint 8 is connected to the second pipe body 7, and the external pressure sleeve 10 is sleeved on an end of the external pressure joint 8. The external pressure joint 8 and the external pressure sleeve 10 are sealed by a sealing colloid 9. The ground wire enters the second pipe body 7 through the external pressure sleeve 10 and the external pressure connector 8, the copper core of the ground wire is peeled 2-4 cm, the lead at the right end of the sealing plug 5 is connected with the copper core of the ground wire by using a self-adhesive tape, the external pressure connector 8 is screwed with the second pipe body 7, the external pressure sleeve 10 is screwed with the external pressure connector 8, and the sealing colloid 9 is extruded to achieve the purposes of ground water resistance and ground wire looseness prevention. Wherein, the ground wire adopts the patchcord.

The sealing device of this application realizes the cable seal that will draw forth+fixed effect, and whole withstand voltage is not less than 35MPa, and 4mm steel pipe cable adopts cut-off type seal, carries out secondary metal seal through 316L metal seal pad, realizes that multilayer circle is sealed+metal seal, draws forth the cable and waterproof through holding tightly rubber packing, through fixed compression cable such as sealing block, and this new-type well head sealing device adopts multistage seal, and can effectively protect the tee bend.

It is to be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like in the above description are directional or positional relationships as indicated based on the drawings, merely to facilitate description of the embodiments of the present disclosure and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus are not to be construed as limiting the embodiments of the present disclosure.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present disclosure, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the presently disclosed embodiments, the terms "mounted," "connected," "secured," and the like are to be construed broadly, as well as being either fixedly connected, detachably connected, or integrally formed, unless otherwise specifically indicated and defined; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art as the case may be.

In the presently disclosed embodiments, unless expressly stated and limited otherwise, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims

1. A gas well wellhead sealing device, comprising:

the outer joint assembly is connected with the second sealing assembly, and a ground wire in the outer joint assembly is connected with a wire at the other end in the second sealing assembly;

the first sealing assembly comprises a compression screw, a metal cone sealing piece and a sealing ring, wherein the compression screw is sealed with the sealing ring by the aid of the sealing ring, and the metal cone sealing piece is arranged on the compression screw.

2. The gas well wellhead seal of claim 1, wherein a metal gasket is disposed between the first tubular body and the interface.

3. A gas well wellhead seal according to claim 1, wherein the cable is stripped or stripped of the steel tube skin beyond 5-10 cm from the metal cone seal.

4. The wellhead seal of claim 1, wherein the second seal assembly comprises a sealing plug and a sealing joint, the sealing plug is disposed on the sealing joint, both ends of the sealing plug are connected with wires, one end of the sealing joint is connected with the first pipe body, and the other end is connected with the second pipe body.

5. The gas well wellhead sealing device of claim 4, wherein the connection between the wire and the sealing plug is a weld.

6. The gas well wellhead sealing device of claim 4, wherein the outer joint assembly comprises an outer pressure joint and an outer pressure sleeve, the outer pressure joint being connected to the second tubular body, the outer pressure sleeve being disposed over an end of the outer pressure joint.

7. The wellhead seal of claim 6, wherein the outer pressure fitting and outer pressure sleeve are sealed by a sealant.

8. The gas well wellhead seal of claim 7, wherein the surface electrical line is positionally fixed by the sealant.

9. The wellhead seal of claim 6, wherein the connection between the second tubular body and the first tubular body is a threaded connection.