KR101758564B1 - Joint for metal pipe - Google Patents

Abstract

The present invention relates to a pin member having an external thread formed on an outer peripheral surface thereof; A box member having an internal thread formed on an inner peripheral surface thereof to be engaged with the external thread of the pin member; And a sealing section that seals a portion of the pin member and the box member which are in contact with each other in the circumferential direction when the pin member and the box member are fastened to each other and the sealing section is formed by an outer peripheral surface of the pin member, And a ring-shaped tapered ring member provided on at least one side of the inner peripheral surface of the tubular member and projecting obliquely in the circumferential direction, wherein the tapered ring member is provided with a plurality of rows of tubular joints extending over the pin member and the box member do.

Description

[0001] JOINT FOR METAL PIPE [0002]

The present invention relates to a well pipe joint having improved sealing performance.

It should be noted that the contents described in this section merely provide background information on the present invention and do not constitute the prior art.

The drilling depth of land or marine wells is getting deeper and the pipes used for this purpose are exposed to high temperature and high pressure environment. These pipes are usually made to be about 10m long and should be connected more than a few km, so many joints or joints are required. The joints used here must withstand various loads depending not only on the environment of high temperature and high pressure but also on the direction of drilling.

In order to connect the pipes, a male thread is machined on the outer surface of the end of one pipe, a female thread is machined on the inner surface of the other pipe or coupler connected thereto, Is used.

Typically, or in the following, a tubular connecting structure having a male thread on a tapered outer circumferential surface is referred to as a pin member, and a tubular connecting structure having female threads on an inner circumferential surface tapered to engage with a male thread of the pin member Referred to as a box member. Such a pin member or a box member may be separately formed and then welded to the pipe or provided as a separate member to the pipe connection and may be provided to the pipe connection by directly machining the shape corresponding to the pin member or the box member.

Such tubular joints must have sealing performance to prevent fluid from escaping to the outside or to prevent foreign substances from entering the interior. The integrity of the sealing performance is determined by the taper of the threads and the contact force that appears at the sealing portion due to the torque generated from each shape. Accordingly, the shape of the thread should be designed to maximize the contact force of the sealing portion.

However, as the horizontal excavation increases, a large amount of bending occurs in the pipe. In the normal sealing part applied to the pipe joint, there is a difference in the contact force generated in the axial inner and outer contact portions between the sealing portions when the bending occurs, .

SUMMARY OF THE INVENTION The present invention provides, as one aspect, a joint for a pipe for a pipe which can improve a sealing performance by increasing a contact area of a sealing section.

According to an aspect of the present invention, there is provided an internal combustion engine comprising: a pin member having an external thread formed on an outer peripheral surface thereof; A box member having an internal thread formed on an inner peripheral surface thereof to be engaged with the external thread of the pin member; And a sealing section that seals a portion of the pin member and the box member which are in contact with each other in the circumferential direction when the pin member and the box member are fastened to each other and the sealing section is formed by an outer peripheral surface of the pin member, And a ring-shaped tapered ring member provided on at least one side of the inner peripheral surface of the tubular member and projecting obliquely in the circumferential direction, wherein the tapered ring member is provided with a plurality of rows of tubular joints extending over the pin member and the box member do.

Preferably, the inclined ring member may be formed of a plurality of rows on either side of the pin member and the box member.

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Preferably, the inclined ring member may be integrally formed on the outer circumferential surface of the pin member, or integrally formed on the inner circumferential surface of the box member.
According to another aspect of the present invention for achieving the above object, the present invention provides a pin member having an external thread formed on an outer peripheral surface thereof; A box member having an internal thread formed on an inner peripheral surface thereof to be engaged with the external thread of the pin member; And a sealing section that seals a portion of the pin member and the box member which are in contact with each other in the circumferential direction when the pin member and the box member are fastened to each other and the sealing section is formed by an outer peripheral surface of the pin member, And a ring-shaped tapered ring member provided on at least one side of the inner circumferential surface of the pin member and protruding obliquely in the circumferential direction, wherein the tapered ring member is formed of a plurality of rows on either side of the pin member and the box member, The ring member is configured such that the inclined ring member disposed relatively close to the shoulder surface in which the pin member and the box member are in contact in the axial direction is disposed on the outer peripheral surface of the pin member or the inner peripheral surface of the box member And the protruding portion is further protruded from the outer circumference of the pipe.

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Preferably, the inclined groove portion is formed at a position opposite to the inclined ring member in a state where the pin member and the box member are engaged.

According to another aspect of the present invention for achieving the above object, the present invention provides a pin member having an external thread formed on an outer peripheral surface thereof; A box member having an internal thread formed on an inner peripheral surface thereof to be engaged with the external thread of the pin member; And a sealing section that seals a portion of the pin member and the box member which are in contact with each other in the circumferential direction when the pin member and the box member are fastened to each other and the sealing section is formed by an outer peripheral surface of the pin member, And a ring-shaped tapered ring member provided on at least one side of the inner circumferential surface of the tapered ring member and projecting obliquely in the circumferential direction, wherein an inclination ring formed at a position opposed to the tapered ring member in a state in which the pin member and the box member are fastened Wherein the inclined ring member and the inclined groove portion are formed in a curved shape, wherein the inclined ring member has a relatively large curvature as compared with the inclined groove portion.

As described above, according to the embodiment of the present invention, the sealing area of the sealing section is increased to improve the sealing performance of the oil pipe joint.

1 is a cross-sectional view illustrating a joint for a pipe tube according to an embodiment of the present invention.
2 is a view showing details of an inclined ring member provided on the pin member of the present invention.
FIG. 3 is a view showing details of a pipe joint according to an embodiment of the present invention in which the "A" portion of FIG. 1 is enlarged.
Fig. 4 is a view showing details of a pipe joint according to another embodiment of the present invention in which the "A" portion of Fig. 1 is enlarged.
Fig. 5 is a view showing details of a joint for a pipe tube according to another embodiment of the present invention in which the "A" portion of Fig. 1 is enlarged.
FIG. 6 is a view showing details of a pipe joint according to another embodiment of the present invention in which the "A" portion of FIG. 1 is enlarged.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. The shape and size of elements in the drawings may be exaggerated for clarity.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a well pipe joint according to an embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, a well pipe according to an embodiment of the present invention may include a pin member 100, a box member 200, and a sealing section.

A pin member 100 formed on an outer circumferential surface of the outer thread 110 and an inner thread 210 engaged with the outer thread 110 of the pin member 100 are formed on the inner circumferential surface of the box member 100, And a sealing section for sealing a portion where the pin member 100 and the box member 200 abut against each other in the circumferential direction when the pin member 100 and the box member 200 are fastened together, The sealing section may include a ring-shaped bevel ring member 300 provided on at least one of the outer circumferential surface of the pin member 100 and the inner circumferential surface of the box member 200 and projecting obliquely in the circumferential direction .

The joint of the present invention includes a pin member (100) formed at one end of a first fluid pipe, a box member (200) formed at one end of a second fluid pipe connected to the first fluid pipe, 100, respectively.

Torque can be applied to the external thread 110 of the pin member 100 and the internal thread 210 of the box member 200 to couple the pin member 100 and the box member 200 in the axial direction of the fluid pipe .

1, the pin member 100 includes an external thread 110 formed on the outer circumferential surface thereof, a sealing member 110 formed on the external thread 110 and extending in the end direction, And the shoulder surface S formed at the tip of the pin member 100 may be formed.

The box member 200 includes an internal thread 210 formed on the inner circumferential surface of the box member 200 and a sealing section formed in the internal thread 210 and extending in the end direction and having a tapered shape without forming the internal thread 210, The shoulder surface S may be formed on the tip end portion.

The external thread 110 of the pin member 100 and the internal thread 210 of the box member 200 are screwed together so that the pin member 100 and the box member 200 are axially close to each other, The second fluid pipe can be fastened.

The external thread 110 of the pin member 100 and the internal thread 210 of the box member 200 are screwed together so that the outer circumferential surface of the pin member 100 and the inner circumferential surface of the box member 200 are close to each other, And the sealing section of the box member 200 are brought into contact with each other in the circumferential direction, the joints of the first and second inertia pipes can be sealed.

The pin member 100 and the box member 200 are fastened with the compound thread applied to the external thread 110 and the internal thread 210 to form a part of the state in which the fastening of the external thread 110 and the internal thread 210 is completed The space can be filled with compounds.

The shoulder surface S of the pin member 100 and the shoulder surface S of the box member 200 are in contact with each other when the pin member 100 and the box member 200 are screwed together, And the stopper of the box member 200.

The sealing section is a region where the pin member 100 and the box member 200 are in contact with each other in the circumferential direction when fastened.

The outer circumferential surface of the pin member 100 and the inner circumferential surface of the box member 200 are in contact with each other to interfere with each other, thereby sealing the joint of the tubular member.

When the external thread 110 of the pin member 100 and the internal thread 210 of the box member 200 are engaged with each other, the tapered sealing section of the pin member 100 extended from the external thread 110, The pin member 100 and the box member 200 can be hermetically sealed while the tapered sealing sections of the box member 200 extending from the first and second protrusions 210 are in contact with each other in the circumferential direction.

That is, the tapered sealing section of the pin member 100 and the tapered sealing section of the box member 200 are deformed by the pressing force applied to the pin member 100 and the box member 200 The sealing section can be sealed.

3 to 6, the inclined ring member 300 may be provided on at least one of the outer circumferential surface of the pin member 100 and the inner circumferential surface of the box member 200.

Previously, the pipe joint deformed due to the bending occurring in the pipe during horizontal excavation. At this time, the contact force is reduced in the sealing part of the curved inner part.

The oil well pipe joint of the present invention can improve the sealing performance of the joint by increasing the contact area of the sealing section by the ring-shaped oblique ring member 300 projecting obliquely in the circumferential direction.

When the sealing section is formed of a helical type, there is a possibility that the fluid leaks out along the screw direction.

On the other hand, according to the present invention, a sealing section is formed by a ring-shaped inclined ring member 300 having a cross section closed in the circumferential direction, so that a single inclined ring member 300 integrally forms a sealing section And it is possible to effectively prevent the fluid flowing inside the fluid tube from leaking.

The tapered outer circumferential surface of the pin member 100 and the tapered inner circumferential surface of the box member 200 are deformed by the pressing force applied to the tapered ring member 300 to seal the pin member 100 and the box member 200, .

The inclined ring member 300 may be composed of a ring-shaped member protruding in the peripheral direction on the outer circumferential surface of the pin member 100 or the inner circumferential surface of the box member 200.

2, the inclined ring member 300 is installed in a form inclined at an inclination angle T set at a line perpendicular to the axial direction of the pin member 100 or the box member 200 .

For example, as shown in Fig. 2, the inclined ring member 300 may be constituted by a ring-shaped member projecting obliquely in the peripheral direction on the outer peripheral surface of the pin member 100. [

When the pin member 100 and the box member 200 are engaged with each other, the tapered ring member 300 provided in the sealing region of the tapered pin member 100 contacts the sealing region of the box member 200 in the circumferential direction Can be reached.

At this time, the upper surface of the inclined ring member 300 is deformed by contact with the sealing section of the box member 200, so that the sealing sections of the pin member 100 and the box member 200 can be sealed with each other.

As another example, as shown in Fig. 4, the inclined ring member 300 may be constituted by a ring-shaped member projecting obliquely in the circumferential direction on the inner peripheral surface of the box member 200. [

The inclined ring member 300 may be formed in a plurality of rows on either side of the pin member 100 and the box member 200 as shown in Figures 2 (b) and 3 (b) .

An inclined ring member 300 may be formed to protrude from the outer circumferential surface of the pin member 100 and a plurality of rows of inclined ring members 300 may be formed.

It is needless to say that a plurality of rows of inclined ring members 300 may protrude from the inner circumferential surface of the box member 200 although not shown.

As shown in FIG. 4, the inclined ring member 300 may be formed in a plurality of rows across the pin member 100 and the box member 200.

A first inclined ring member 301 protruding from the outer circumferential surface of the pin member 100 and a second inclined ring member 302 protruding from the inner circumferential surface of the box member 200. [

Of course, although not shown, the oblique ring member 300 is formed in a plurality of rows over the pin member 100 and the box member 200, and a first inclined ring member 301 is formed on the outer circumferential surface of the pin member 100, Two or more rows of the second inclined ring members 302 may be formed on the inner peripheral surface of the box member 200. [

The inclined ring member 300 may be integrally formed on the outer circumferential surface of the pin member 100 or integrally formed on the inner circumferential surface of the box member 200.

That is, the fin member 100 can be processed in a state in which the oblique ring member 300 is formed on the outer peripheral surface of the pin member 100 when machining, and the box member 200 can be formed on the inner peripheral surface of the box member 200 It can be processed in a state in which the inclined ring member 300 is formed.

At this time, the inclined ring member 300 may be formed as a metal seal integrally formed on the outer circumferential surface of the pin member 100 or the inner circumferential surface of the box member 200.

The sealing section of the pin member 100 and the box member 200 can be sealed while the metal seal is deformed by the pressing force applied to the tapered outer peripheral surface of the pin member 100 and the tapered inner peripheral surface of the box member 200. [

4 to 6, in a state where the pin member 100 and the box member 200 are engaged with each other, a position opposite to the inclined ring member 300 such that the inclined ring member 300 is inserted And an inclined groove portion 400 provided on the upper surface of the substrate.

The inclined groove portion 400 is a portion into which the inclined ring member 300 is inserted in a state where the pin member 100 and the box member 200 are engaged.

The inclined groove portion 400 may be formed on at least one of the outer circumferential surface of the pin member 100 and the inner circumferential surface of the box member and may have a shape inclined inward in the circumferential direction.

At this time, the inclined groove portion 400 can be disposed at a position where the inclined ring member 300 is opposed to the inclined groove portion 400, in a state where the pin member 100 and the box member 200 are completely fastened.

As shown in FIG. 4 (b), a part of the inclined ring member 300 may be inserted into the inclined groove portion 400.

The inclined ring member 300 may have the same curvature in the inclined groove portion 400 and the inclined ring member 300 may be inclined with respect to the inclined ring member 300 in a state that a part of the inclined ring member 300 is in contact with the inclined groove portion 400, The sealing surface can be ensured while the contact surface of the groove portion 400 is pressed.

When the inclined ring member 300 is formed on the pin member 100, the inclined groove portion 400 may be formed on the box member 200.

When the inclined ring member 300 is formed on the box member 200, the inclined groove portion 400 may be formed on the pin member 100 fastened to the box member 200.

At this time, the inclined groove portion 400 can be disposed at a position where the inclined ring member 300 is opposed to the inclined groove portion 400, in a state where the pin member 100 and the box member 200 are completely fastened.

4 (b), the inclined groove portion 400 may be formed in a plurality of rows across the pin member 100 and the box member 200.

A first inclined groove portion 401 formed inwardly from the outer peripheral surface of the pin member 100 and a second inclined groove portion 402 formed inwardly from the inner peripheral surface of the box member 200. [

Of course, the inclined groove portion 400 is formed in a plurality of rows over the pin member 100 and the box member 200, and two or more first inclined groove portions 401 are formed on the outer peripheral surface of the pin member 100, Two or more second inclined groove portions 402 may be formed on the inner peripheral surface of the box member 200.

5, the inclined ring member 300 disposed relatively close to the shoulder surface S on which the pin member 100 and the box member 200 are axially contacted is disposed relatively far away Can be further protruded from the outer circumferential surface of the pin member 100 or the inner circumferential surface of the box member 200 as compared with the inclined ring member 300.

This is because the pin member 100 and the box member 200 generate greater stress in the region closer to the pin member 100 and the shoulder surface S in contact with the box member 200 in the axial direction The reason for this is that the inclined ring member 300, which is more protruded by the large stress, can be easily deformed in the sealing section.

As the protruding tapered ring member 300 is deformed by contact, the sealing section having a larger area can be primarily sealed, and the relatively less protruding tapered ring member 300 can seal the sealing section secondarily .

6, the inclined ring member 300 and the inclined groove portion 400 are formed in a curved shape, and the inclined ring member 300 has a relatively large curvature relative to the inclined groove portion 400, Lt; / RTI >

The inclined ring member 300 having a relatively large curvature is deformed by contact with the inclined groove portion 400 so that the upper end of the inclined ring member 300 is deformed and inserted into the inclined groove portion 400, have.

Although the embodiments of the present invention have been described in detail, it is to be understood that the scope of the present invention is not limited to the above embodiments and various changes and modifications may be made without departing from the scope of the present invention. It will be obvious to those of ordinary skill in the art.

100: pin member 110: external thread
200: box member 210: internal thread
300: inclined ring member 301: first inclined ring member
302: second inclined ring member 400: inclined groove portion
401: first inclined groove portion 402: second inclined groove portion
S: shoulder surface T: tilt angle

Claims (7)

A pin member formed on an outer peripheral surface of an external thread;
A box member having an internal thread formed on an inner peripheral surface thereof to be engaged with the external thread of the pin member; And
And a sealing section for sealing a portion of the pin member and the box member abutting against each other in the circumferential direction when the pin member and the box member are engaged,
In the sealing section,
And a ring-shaped oblique ring member provided on at least one of an outer circumferential surface of the pin member and an inner circumferential surface of the box member and projecting obliquely in the circumferential direction,
Wherein the inclined ring member is formed in a plurality of rows across the pin member and the box member.
The method according to claim 1,
Wherein the inclined ring member is formed of a plurality of rows on either side of the pin member and the box member.
delete 2. The apparatus according to claim 1,
Wherein the joint member is integrally formed on the outer circumferential surface of the pin member or integrally formed on the inner circumferential surface of the box member.
A pin member formed on an outer peripheral surface of an external thread;
A box member having an internal thread formed on an inner peripheral surface thereof to be engaged with the external thread of the pin member; And
And a sealing section for sealing a portion of the pin member and the box member abutting against each other in the circumferential direction when the pin member and the box member are engaged,
In the sealing section,
And a ring-shaped oblique ring member provided on at least one of an outer circumferential surface of the pin member and an inner circumferential surface of the box member and projecting obliquely in the circumferential direction,
Wherein the inclined ring member is formed in a plurality of rows on either side of the pin member and the box member,
The inclined ring member
The inclined ring member disposed relatively close to the shoulder surface in which the pin member and the box member are in contact in the axial direction is further protruded from the outer circumferential surface of the pin member or the inner circumferential surface of the box member Wherein the joint of the well pipe is characterized in that:
The method according to any one of claims 1, 2, 4, and 5,
And a tapered groove portion formed at a position opposite to the tapered ring member in a state where the pin member and the box member are fastened together.
A pin member formed on an outer peripheral surface of an external thread;
A box member having an internal thread formed on an inner peripheral surface thereof to be engaged with the external thread of the pin member; And
And a sealing section for sealing a portion of the pin member and the box member abutting against each other in the circumferential direction when the pin member and the box member are engaged,
In the sealing section,
And a ring-shaped oblique ring member provided on at least one of an outer circumferential surface of the pin member and an inner circumferential surface of the box member and projecting obliquely in the circumferential direction,
And an inclined groove portion formed at a position opposite to the inclined ring member in a state where the pin member and the box member are engaged,
Wherein the inclined ring member and the inclined groove portion are formed in a curved shape, and the inclined ring member has a curvature relatively larger than that of the inclined groove portion.

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