KR101736663B1 - Pipe joint with sealing part - Google Patents

Pipe joint with sealing part Download PDF

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Publication number
KR101736663B1
KR101736663B1 KR1020160032587A KR20160032587A KR101736663B1 KR 101736663 B1 KR101736663 B1 KR 101736663B1 KR 1020160032587 A KR1020160032587 A KR 1020160032587A KR 20160032587 A KR20160032587 A KR 20160032587A KR 101736663 B1 KR101736663 B1 KR 101736663B1
Authority
KR
South Korea
Prior art keywords
sealing portion
sealing
pin member
width
pipe joint
Prior art date
Application number
KR1020160032587A
Other languages
Korean (ko)
Inventor
조광일
이종관
김종민
Original Assignee
주식회사 포스코
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 포스코 filed Critical 주식회사 포스코
Priority to KR1020160032587A priority Critical patent/KR101736663B1/en
Application granted granted Critical
Publication of KR101736663B1 publication Critical patent/KR101736663B1/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/042—Threaded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
    • F16L15/04—Screw-threaded joints; Forms of screw-threads for such joints with additional sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
    • F16L15/08—Screw-threaded joints; Forms of screw-threads for such joints with supplementary elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems

Abstract

The present invention relates to a pipe joint with a sealing portion, comprising: a pin member which has a male thread; a box member which has a female thread; and a sealing portion which is formed to radially protrude from a portion where the pin member and the box member are screwed together in an axial direction and come in contact. The sealing portion is provided with a width change portion in which a dimension in the width direction of the sealing portion is changed. It is possible to solve stress which can occur at the sealing portion in a width-narrowed portion due to the sealing portion in which the dimension of the width is changed, the excessive contact force is prevented from occurring, and it is possible to secure sealing performance.

Description

{Pipe joint with sealing part}

The present invention relates to a pipe joint capable of securing sealing performance even when excessive bending occurs.

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, .

(Patent Document 1) JP 2015-55296 A

Accordingly, it is a main object of the present invention to provide a pipe joint capable of securing sealing performance even when excessive bending occurs.

A pipe joint according to an embodiment of the present invention includes: a pin member having a male thread; Box members with female threads; And a sealing portion radially protruding from the end portion of the pin member or the box member at a portion where the pin member and the box member are screwed to each other in an axial direction and the sealing portion is provided with a sealing portion And a width changing portion whose dimension changes in the width direction of the sealing portion.

As described above, according to the present invention, the stress that may occur in the sealing portion due to the varying width of the sealing portion can be eliminated at a portion where the width is narrowed, thereby preventing the occurrence of excessive contact force, Can be secured.

1 is a cross-sectional view schematically showing a pipe joint according to an embodiment of the present invention.
Fig. 2 is an enlarged cross-sectional view of part A of Fig. 1. Fig.
3 is a plan view showing a part of the pin member shown in Fig.
4 is a plan view showing a part of a pin member in a pipe joint according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1 is a cross-sectional view schematically showing a pipe joint according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a portion A of FIG.

As shown in these drawings, a pipe joint according to an embodiment of the present invention includes a pin member 10 having a male thread 12; A box member (20) having a female thread (22); And a sealing portion (30) radially protruding from the end portion of the pin member or the box member, at a portion where the pin member and the box member are screwed to each other and axially engaged with each other.

The pipe joint of the present invention comprises a pin member (10) formed at one end or both ends of each pipe, and a box member (20) coupled to the pin member.

The pin member 10 and the box member 20 are provided with tapered threaded portions 12 and 22 as mutually corresponding portions, a sealing portion 30 provided on the non-threaded portion extending from these threads, And shoulder portions 14 and 24 are respectively formed.

The tapered thread 12 and the female thread 22 are important for rigidly assembling and fixing the tube joint and the sealing portion 30 is formed by the pin member 10 and the box member 20 contacting each other, And the shoulder portions 14 and 24 serve as stoppers during the screwing of the pipe joints.

2, the sealing portion 30 is a region where both the non-thread portions of the pin member 10 and the box member 20 are interfered with each other when the corresponding pin member 10 and the box member 20 are fastened to each other, And is in contact with the tapered portion of the box member or the sealing surface 23 on the inner circumferential surface of the obliquely outer portion of the box member.

Although the sealing member 30 is shown as being protruded in the pin member 10 in the present specification, the sealing member 30 is not limited to the sealing member 30, but may be a sealing member having a shape protruding radially inwards from the inner surface of the non- It is also acceptable that an additional portion is provided. However, it is preferable that a sealing portion is formed on the outer circumferential surface of the fin member for ease of processing.

To begin with the box member 20 of the tube joint, the box member comprises a recess 21 which is delimited by a metal forming the tube or coupler. The concave portion 21 has a shoulder portion 24 that is shaped and fixed to the surface of the corresponding pin member 10 at the time of assembling the pipe joint.

The shoulder portion 24 is connected to the non-threaded portion, and a part of the inner peripheral surface of the non-threaded portion becomes the sealing surface 23 and comes into contact with the sealing portion 30 of the pin member 10. The non-thread can be connected to the inner thread 22.

Some of the pin members 10 constituting the pipe joint may have a shape complementary to the concave portion 21 of the box member 20. The pin member has a shoulder portion (14) at the tip end in the axial direction.

The shoulder portion 14 is connected to a non-threaded portion, and a substantially band-shaped sealing portion 30 protruding radially outward is formed along a circumferential direction of the pin member 10 on a part of the outer surface of the non-threaded portion.

The sealing portion 30 may be formed stepwise, and the thickness of the sealing portion may be constant. Particularly, in the sealing part of the pipe joint according to an embodiment of the present invention, the width changing part 32 whose dimension changes in the width direction of the sealing part along the axial direction of the pipe can be provided. The width changing portion may have a shape of a groove opened toward the axial direction of the tube.

In order to ensure the integrity of the good sealing portion 30 and to prevent the sealing portion from being damaged even when stress is added, the size and shape of the formed width changing portion must be carefully selected.

At least one of the width changing portions 32 may be formed in the circumferential direction. When the width changing portions 32 are formed in two or more, the width changing portions 32 may be arranged at regular intervals along the circumferential direction.

The sealing portion 30 of the present invention having the width changing portion 32 comes into contact with the sealing surface 23 of the box member 20. The non-threads can be connected to the outer male threads 12.

When the joint is assembled for pipe connection, the pin member 10 and the box member 20 are threaded by threading the threads 12 and 22, thereby connecting the pin member and the box member. Torque can be applied until a seal is formed between these two members. A seal is formed between the sealing portion 30 and the sealing surface 32 while the shoulder portions 14 and 24 are in contact with each other.

The integrity of the sealing portion 30 is not impaired even if the tube joint is bent due to the bending of the tube. In the case of a conventional pipe joint, for example, the pipe joint is bent due to the bending occurring in the pipe during horizontal excavation. At this time, the contact force is reduced in the sealing portion of the curved inner portion, A contact force may excessively occur in the sealing region. As a result of this deformation, when the excessive contact force is applied to the sealing portion, the sealing portion is broken, and if the bending occurs in the opposite direction, the sealing is not performed.

In the pipe joint according to the embodiment of the present invention, the sealing portion 30 having the width changing portion 32 eliminates the stress that may occur in the sealing portion by the narrowed portion to prevent the excessive contact force from being generated . As a result, breakage of the sealing portion can be avoided, and the integrity of the sealing portion can be maintained without being damaged.

Although only one sealing portion 30 is shown and described herein for convenience of explanation, the present invention is not limited thereto. A plurality of sealing portions may be provided on the outer circumferential surface of the pin member 10 or the inner circumferential surface of the box member 20 .

In addition, the width changing portion 32 is selectively formed so as to have a smoothly changing shape without abrupt change, thereby preventing excessive stress concentration. For example, as shown in FIG. 4, the sealing part of the tube joint according to another embodiment of the present invention may have a soft wave shape at the tip extending along the circumferential direction. Even in this case, the width changing portion 32 'whose dimension changes in the width direction of the sealing portion can be provided.

The foregoing description is merely illustrative of the technical idea of the present invention and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10: pin member 12: male thread
14: shoulder portion 20: box member
22: female thread 23: sealing face
30: sealing part 32, 32 ': width changing part

Claims (7)

A pin member having a male thread;
Box members with female threads; And
Wherein the pin member and the box member are integrally formed with each other at an end portion of the pin member or the box member,
Lt; / RTI >
Wherein the sealing portion is provided with a width changing portion whose dimension changes in the width direction of the sealing portion along the axial direction.
The method according to claim 1,
Wherein the sealing portion is integrally formed on an outer circumferential surface of the pin member or an inner circumferential surface of the box member.
3. The method of claim 2,
Wherein a plurality of the sealing portions are provided.
3. The method of claim 2,
Wherein the sealing portion is formed to be stepped.
5. The method of claim 4,
Wherein the sealing portion has a constant thickness.
The method according to claim 1,
And the width changing portion has a shape of a groove opened toward the axial direction of the tube.
The method according to claim 1,
Wherein the sealing portion has a wave shape at a tip extending along the circumferential direction.
KR1020160032587A 2016-03-18 2016-03-18 Pipe joint with sealing part KR101736663B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020160032587A KR101736663B1 (en) 2016-03-18 2016-03-18 Pipe joint with sealing part

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020160032587A KR101736663B1 (en) 2016-03-18 2016-03-18 Pipe joint with sealing part

Publications (1)

Publication Number Publication Date
KR101736663B1 true KR101736663B1 (en) 2017-05-30

Family

ID=59053034

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020160032587A KR101736663B1 (en) 2016-03-18 2016-03-18 Pipe joint with sealing part

Country Status (1)

Country Link
KR (1) KR101736663B1 (en)

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