CN219570040U

CN219570040U - Mechanical seal flushing pipe assembly for petroleum and natural gas drilling

Info

Publication number: CN219570040U
Application number: CN202320369037.6U
Authority: CN
Inventors: 李学军; 张义; 闫伟成
Original assignee: Beijing Jiejiexi Petroleum Equipment Co ltd
Current assignee: Beijing Jiejie West Technology Co ltd
Priority date: 2023-03-02
Filing date: 2023-03-02
Publication date: 2023-08-22
Anticipated expiration: 2033-03-02

Abstract

The utility model relates to a mechanical seal flushing pipe assembly for petroleum and natural gas drilling, which comprises an upper nut main body, a sealing ring assembly and a lower nut which are sequentially connected from top to bottom; the sealing ring assembly consists of two first sealing rings and a second sealing ring which are in axial butt joint, the first sealing rings are connected with the upper nut main body, and the second sealing rings are connected with the lower nut; any one of the first sealing ring and the second sealing ring comprises a sealing ring main body and a metal ring seat sleeved outside the sealing ring main body. The mechanical seal flushing pipe assembly has the beneficial effects that the mechanical seal flushing pipe assembly is connected to the outside of the sealing ring body in a sleeved mode through the metal ring seat, even if the sealing ring body is broken and damaged due to vibration and impact, the broken and damaged sealing ring body can be prevented from falling into a well through the metal ring seat, and compared with the prior art, the mechanical seal flushing pipe assembly is higher in safety, and the drilling operation efficiency is not affected due to the fact that the broken and damaged sealing ring body falls into the well.

Description

Mechanical seal flushing pipe assembly for petroleum and natural gas drilling

Technical Field

The utility model relates to the technical field of petroleum and natural gas drilling, in particular to a mechanical seal flushing pipe assembly for petroleum and natural gas drilling.

Background

The mechanical seal washpipe assembly is one of the important components of an oil and gas drilling water tap or top drive for connecting a gooseneck and a base pipe that rotates relative to the gooseneck. The upper end of the mechanical seal flushing pipe assembly is connected with the gooseneck, and the lower end of the mechanical seal flushing pipe assembly is connected with the faucet or the top-driven main shaft, so that a circulating channel of drilling fluid is formed, and meanwhile, the main shaft is rotationally sealed. The device for preventing fluid leakage is formed by keeping the joint and relative sliding of a pair of end faces perpendicular to the rotation axis under the action of fluid pressure and the elasticity of a compensation mechanism and the cooperation of auxiliary sealing, and ensures that high-pressure slurry output by a slurry pump can be conveyed to a downhole drill bit. Two annular parts which are mutually adhered and relatively rotated in the mechanical seal flushing pipe assembly are called a sealing ring. In order to ensure that the sealing ring has long service life and good sealing performance, the material of the sealing ring is selected by considering the matters of wear resistance, corrosion resistance, high temperature resistance, good thermal conductivity, high mechanical strength, small friction coefficient, self-lubricity and the like. Meanwhile, the drilling mud is corrosive due to the various additives contained therein and the high temperature and pressure. Engineering ceramics have excellent chemical stability, high hardness and wear resistance, so the engineering ceramics are ideal sealing ring materials for corrosion-resistant mechanical sealing. However, engineering ceramics have the disadvantages of low impact toughness and high brittleness. Meanwhile, in the petroleum and natural gas drilling process, vibration and impact generated by breaking rock by a drill bit can be transmitted to a water tap or a top drive through a drilling tool and act on a mechanical seal flushing pipe assembly, once the vibration and impact cause the sealing ring to be broken, the broken sealing ring easily enters the bottom of a well along with mud, the drill bit is damaged slightly, and the drill bit is stuck or the drilling is blocked, so that underground falling object accident treatment is needed. Therefore, the broken sealing ring is prevented from falling into the well, the intrinsic safety of equipment is improved, and the sealing ring is also an important factor for guaranteeing the working efficiency and safety of petroleum and natural gas drilling.

There is a need for a mechanically sealed washpipe assembly for oil and gas drilling that prevents broken seal rings from falling into the well.

Disclosure of Invention

First, the technical problem to be solved

In view of the above-mentioned shortcomings and disadvantages of the prior art, the present utility model provides a mechanical seal flushing pipe assembly for petroleum and gas drilling, which solves the technical problem that the working efficiency is affected because the broken sealing ring cannot be prevented from falling into the well in the prior art.

(II) technical scheme

In order to achieve the above purpose, the main technical scheme adopted by the utility model comprises the following steps:

the utility model provides a mechanical seal flushing pipe assembly for petroleum and natural gas drilling, which comprises an upper nut main body, a sealing ring assembly and a lower nut which are sequentially connected from top to bottom. The sealing ring assembly is composed of two first sealing rings and a second sealing ring which are in axial butt joint, the first sealing rings are connected with the upper nut main body, and the second sealing rings are connected with the lower nut. Any one of the first sealing ring and the second sealing ring comprises a sealing ring main body and a metal ring seat sleeved outside the sealing ring main body.

Optionally, an elastic sealing ring is further arranged between the sealing ring main body and the metal ring seat.

Alternatively, the seal ring body includes a ceramic ring located radially inward and a metal ring bonded to a radially outer peripheral surface of the ceramic ring.

Optionally, an anti-rotation component is further arranged on the metal ring seat. The anti-rotation component is connected with the metal ring seat and the sealing ring main body so as to prevent relative rotation between the sealing ring main body and the metal ring seat.

Optionally, the upper nut body includes an upper nut, an upper flange, a floating ring, a lower flange, and an elastic assembly. The upper nut is sleeved with the floating ring in a vertically sliding manner through the upper flange, and the floating ring is connected with the first sealing ring through the lower flange; the elastic component is connected between the upper flange and the lower flange.

Optionally, sliding holes are respectively formed in the left edge and the right edge of the lower flange. The elastic component comprises two guide rods and springs penetrating through the guide rods. One ends of the two guide rods are respectively fixed on the upper flange, the left edge and the right edge of the lower flange are sleeved on the guide rods in a vertically sliding way through the sliding holes, and the springs are positioned between the upper flange and the lower flange.

Optionally, the second end of the guide rod is provided with threads and the second end thereof is screwed with a safety nut.

Optionally, a plurality of first installation blind holes are evenly formed in the bottom of the upper nut body along the circumferential direction of the upper nut body, and a downward first connecting pin is inserted into each first installation blind hole. The outer side of the first sealing ring is uniformly provided with a plurality of first butt joint grooves along the circumferential direction of the first sealing ring, and a plurality of first connecting pins are inserted into a plurality of first butt joint grooves in a one-to-one correspondence manner.

Optionally, a plurality of second installation blind holes are evenly formed in the top of the lower nut along the circumferential direction of the lower nut, and a second connecting pin is inserted into each second installation blind hole. And a plurality of second butt joint grooves are uniformly formed in the outer side of the second sealing ring along the circumferential direction of the second sealing ring, and a plurality of second connecting pins are correspondingly inserted into a plurality of second butt joint grooves one by one.

(III) beneficial effects

The beneficial effects of the utility model are as follows:

according to the mechanical seal flushing pipe assembly for petroleum and natural gas drilling, the metal ring seat is sleeved outside the sealing ring main body, even if the sealing ring main body is broken and damaged due to vibration and impact, the broken and damaged sealing ring main body can be prevented from falling into a well by the metal ring seat, and compared with the prior art, the mechanical seal flushing pipe assembly is higher in safety, and the drilling operation efficiency is not affected due to the fact that the broken and damaged sealing ring main body falls into the well.

Drawings

FIG. 1 is a schematic illustration of a mechanically sealed washpipe assembly for oil and gas drilling in accordance with an embodiment of the present utility model;

FIG. 2 is an exploded view of a second seal ring in accordance with an embodiment of the present utility model;

FIG. 3 is a schematic structural view of a seal ring body in accordance with an embodiment of the present utility model;

FIG. 4 is a schematic vertical cross-section of a seal ring body in an embodiment of the utility model.

[ reference numerals description ]

11: a top nut; 12: an upper flange; 13: a floating ring; 14: a lower flange; 15: a guide rod; 16: a spring; 21: a first seal ring; 22: a second seal ring; 23: a seal ring main body; 231: a ceramic ring; 232: a metal ring; 24: a metal ring seat; 241: an anti-rotation screw; 25: an elastic sealing ring; 3: and a lower nut.

Detailed Description

In order that the above-described aspects may be better understood, exemplary embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art. Wherein references herein to "upper", "lower", "left", "right", etc. are made to the orientation of fig. 1.

As shown in fig. 1-4, the embodiment of the utility model provides a mechanical seal flushing pipe assembly for petroleum and gas drilling, which comprises an upper nut main body, a sealing ring assembly and a lower nut 3 which are sequentially connected from top to bottom. The sealing ring assembly consists of two axially butted first sealing rings 21 and second sealing rings 22, wherein the first sealing rings 21 are connected with the upper nut body, and the second sealing rings 22 are connected with the lower nut 3. Either one of the first seal ring 21 and the second seal ring 22 includes a seal ring body 23 and a metal ring seat 24 sleeved outside the seal ring body 23. Wherein the seal ring main body 23 includes a ceramic ring 231 located at a radially inner side and a metal ring 232 coupled to a radially outer circumferential surface of the ceramic ring 231, sealability and corrosion resistance are ensured by the ceramic ring 231 at the inner side, and the ceramic ring 231 is protected by the metal ring 232 at the outer ring.

Specifically, the mechanical seal flushing pipe assembly for petroleum and natural gas drilling provided by the embodiment of the utility model is sleeved outside the sealing ring main body 23 through the metal ring seat 24, even if the sealing ring main body 23 is broken and damaged by vibration and impact, the broken and damaged sealing ring main body 23 can be prevented from falling into the well through the metal ring seat 24, and compared with the prior art, the mechanical seal flushing pipe assembly has the advantages that the drilling operation efficiency is not affected due to the falling of the broken and damaged sealing ring main body 23 into the well, and the safety is higher.

Further, as shown in fig. 2, an elastic sealing ring 25 is further arranged between the sealing ring main body 23 and the metal ring seat 24, and the elastic sealing ring 25 is made of an elastic material, so that the sealing effect is achieved, and meanwhile, the damping and buffering effects can be achieved, and the impact and vibration received by the sealing ring main body 23 are relieved. The metal ring seat 24 is also provided with an anti-rotation component, and the anti-rotation component is connected with the metal ring seat 24 and the sealing ring main body 23 so as to prevent relative rotation between the sealing ring main body and the metal ring seat. The anti-rotation assembly includes an anti-rotation screw 241. The lateral part of metal ring seat 24 has evenly offered a plurality of rotation prevention through-holes along its circumference, and a plurality of rotation prevention blind holes have been seted up along its circumference to the lateral part of sealing ring main part 23, and a plurality of rotation prevention through-holes and a plurality of rotation prevention blind holes one-to-one, rotation prevention screw 241 pass the rotation prevention through-hole, twist in the rotation prevention blind hole that corresponds with the rotation prevention through-hole, when fixing sealing ring main part 23, can also prevent to take place relative rotation between sealing ring main part 23 and the metal ring seat 24, can not influence torque transmission and the seal between first sealing ring 21 and the second sealing ring 22.

Further, as shown in fig. 1, the upper nut body includes an upper nut 11, an upper flange 12, a floating ring 13, a lower flange 14, and an elastic member. The upper nut 11 is sleeved with the floating ring 13 in a vertically sliding manner through the upper flange 12, a sealing structure is further arranged between the upper nut 11 and the floating ring 13, the floating ring 13 is connected with the first sealing ring 21 through the lower flange 14, and the elastic component is connected between the upper flange 12 and the lower flange 14. Specifically, slide holes are respectively formed at the left and right edges of the lower flange 14. The elastic component comprises two guide rods 15 and a spring 16 penetrating the guide rods 15. One end of each of the two guide rods 15 is fixed to the upper flange 12, the left and right edges of the lower flange 14 are sleeved on the guide rods 15 in a vertically sliding manner through sliding holes, the springs 16 are located between the upper flange 12 and the lower flange 14, the second ends of the guide rods 15 are provided with threads, and the second ends of the guide rods 15 are screwed with safety nuts so as to prevent the lower flange 14 from being separated from the guide rods 15.

Further, as shown in fig. 1, a plurality of first installation blind holes are uniformly formed in the bottom of the upper nut body along the circumferential direction of the upper nut body, and a downward first connecting pin is inserted into each first installation blind hole. A plurality of first butt joint grooves are uniformly formed in the circumferential direction of the outer side of the first sealing ring 21, and a plurality of first connecting pins are inserted into the plurality of first butt joint grooves in a one-to-one correspondence manner. In this embodiment, the first mounting hole is formed at the bottom of the lower flange 14, and the first docking groove is formed at the outer side of the metal ring seat 24 of the first seal ring 21. A plurality of second installation blind holes are uniformly formed in the top of the lower nut 3 along the circumferential direction of the lower nut, and a second connecting pin is inserted into each second installation blind hole. A plurality of second butt joint grooves are uniformly formed in the circumferential direction of the outer side of the second sealing ring 22, and a plurality of second connecting pins are inserted into the second butt joint grooves in a one-to-one correspondence manner. Specifically, the second docking groove is opened on the outer side of the metal ring seat 24 of the second seal ring 22. In this embodiment, the number of the first mounting blind holes and the second mounting blind holes is three, and the first mounting blind holes and the second mounting blind holes are distributed on the bottom of the lower flange 14 and the top of the lower nut 3 in a triangular shape, and the first sealing ring 21 and the second sealing ring 22 can be fixed by the three first connecting pins and the three second connecting pins, respectively, and the first sealing ring 21 and the second sealing ring 22 can be prevented from rotating relatively.

The mechanical seal flushing pipe assembly for petroleum and gas drilling provided by the specific embodiment of the utility model can be installed on a petroleum and gas drilling water tap or a top drive, an upper nut 11 can be screwed on the lower end joint of a gooseneck, a lower nut 3 can be screwed on the upper end joint of a central pipe, the connection of the gooseneck and the central pipe is realized, the sealing effect on high-pressure and high-temperature slurry can be ensured by an upper nut main body, a first sealing ring 21, a second sealing ring 22 and a lower nut 35, vibration and impact on the sealing ring main body 23 can be relieved by an elastic sealing ring 25, the service life of the sealing ring main body 23 is prolonged, and the cracking and failure of the sealing ring main body 23 can be prevented by a metal ring seat 24 from falling into a well so as to improve the drilling operation efficiency and safety.

In the description of the present utility model, it should be understood that 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 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 present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; may be a communication between two elements or an interaction between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature is "on" or "under" a second feature, which may be in direct contact with the first and second features, or in indirect contact with the first and second features via an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is level lower than the second feature.

In the description of the present specification, the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., refer to particular features, structures, materials, or characteristics described in connection with the embodiment or example as being included in at least one embodiment or example of the present utility model. 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. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that alterations, modifications, substitutions and variations may be made in the above embodiments by those skilled in the art within the scope of the utility model.

Claims

1. A mechanical seal flushing pipe assembly for petroleum and natural gas drilling is characterized in that,

comprises an upper nut main body, a sealing ring component and a lower nut (3) which are sequentially connected from top to bottom;

the sealing ring assembly consists of two first sealing rings (21) and second sealing rings (22) which are in axial butt joint, the first sealing rings (21) are connected with the upper nut main body, and the second sealing rings (22) are connected with the lower nut (3);

any one of the first sealing ring (21) and the second sealing ring (22) comprises a sealing ring main body (23) and a metal ring seat (24) sleeved outside the sealing ring main body (23).

2. The mechanically sealed washpipe assembly for oil and gas drilling of claim 1, wherein,

an elastic sealing ring (25) is further arranged between the sealing ring main body (23) and the metal ring seat (24).

3. The mechanically sealed washpipe assembly for oil and gas drilling of claim 1, wherein,

the seal ring main body (23) includes a ceramic ring (231) located radially inward and a metal ring (232) bonded to a radially outer peripheral surface of the ceramic ring (231).

4. The mechanically sealed washpipe assembly for oil and gas drilling of claim 1, wherein,

an anti-rotation component is further arranged on the metal ring seat (24);

the anti-rotation component is connected with the metal ring seat (24) and the sealing ring main body (23) so as to prevent relative rotation between the sealing ring main body (23) and the metal ring seat (24).

5. The mechanically sealed washpipe assembly for oil and gas drilling of claim 1, wherein,

the upper nut main body comprises an upper nut (11), an upper flange (12), a floating ring (13), a lower flange (14) and an elastic component;

the upper nut (11) is sleeved with the floating ring (13) in a vertically sliding way through the upper flange (12), and the floating ring (13) is connected with the first sealing ring (21) through the lower flange (14); the elastic assembly is connected between the upper flange (12) and the lower flange (14).

6. The mechanically sealed washpipe assembly for oil and gas drilling of claim 5,

slide holes are respectively formed in the left edge and the right edge of the lower flange (14);

the elastic component comprises two guide rods (15) and springs (16) penetrating through the guide rods (15);

one ends of the two guide rods (15) are respectively fixed on the upper flange (12), the left edge and the right edge of the lower flange (14) are sleeved on the guide rods (15) in a vertically sliding mode through the sliding holes, and the springs (16) are located between the upper flange (12) and the lower flange (14).

7. The mechanically sealed washpipe assembly for oil and gas drilling of claim 6, wherein,

the second end of the guide rod (15) is provided with threads, and the second end of the guide rod is screwed with a safety nut.

8. The mechanically sealed washpipe assembly for oil and gas drilling of claim 1, wherein,

the bottom of the upper nut main body is uniformly provided with a plurality of first mounting blind holes along the circumferential direction of the upper nut main body, and each first mounting blind hole is internally inserted with a downward first connecting pin;

the outer side of the first sealing ring (21) is uniformly provided with a plurality of first butt joint grooves along the circumferential direction of the first sealing ring, and a plurality of first connecting pins are inserted into a plurality of first butt joint grooves in a one-to-one correspondence manner.

9. The mechanically sealed washpipe assembly for oil and gas drilling of claim 1, wherein,

a plurality of second mounting blind holes are uniformly formed in the top of the lower nut (3) along the circumferential direction of the lower nut, and a second connecting pin is inserted into each second mounting blind hole;

and a plurality of second butt joint grooves are uniformly formed in the outer side of the second sealing ring (22) along the circumferential direction of the second sealing ring, and a plurality of second connecting pins are correspondingly inserted into a plurality of second butt joint grooves one by one.