CN200968455Y

CN200968455Y - Double shoulder arc-to-cone sealed tube screwed connection structure

Info

Publication number: CN200968455Y
Application number: CN 200620151412
Authority: CN
Inventors: 王春河; 邱峰; 徐志谦; 孙一清; 张军; 屈强; 陈涛; 郝玉华
Original assignee: Tianjin Pipe Group Corp
Current assignee: Tianjin Pipe Group Corp
Priority date: 2006-11-20
Filing date: 2006-11-20
Publication date: 2007-10-31
Anticipated expiration: 2016-11-20

Abstract

The utility model provides a double-shouldered arc-to-bevel sealed pipe threaded connection structure, which is screwed together by a pipe with an external thread on an end and a coupling with an internal thread on the end. The external thread of the pipe and the internal thread of the coupling are the taper thread with the serrated thread form. A first external torque shoulder, an external arc sealing face and a second external torque shoulder are orderly arranged on the end of the external thread; a first internal torque shoulder, an internal taper sealing face and a second internal torque shoulder are orderly arranged on the corresponding position of the coupling matching with the pipe. The beneficial effect of the utility model is that the pipe threaded connection structure combined the serrated threaded connection and the arc-to-bevel sealing face promotes the anti slipping performance and improves the anti-leakage property of the coupling; the double shoulder structure strengthens the anti-over torque ability of the threaded connector while screwing, and prevents the sealing structure from plastic deformation.

Description

Two shoulder arcs are to the cone sealing pipe screw connection structure

Technical field

The utility model relates to petroleum pipeline seal for pipe joints connected element, particularly is applied in the drilling well, completion process in the petroleum natural gas exploration, and two shoulder arcs that manifold is connected and sealed are to the cone sealing pipe screw connection structure.

Background technique

In the exploration and recovery process of petroleum and natural gas, tubing is one of important materials of completion.Along with the more sophisticated of geological condition and the continuous increase of well depth, the particularly exploitation of high pressure oil field, traditional pipe thread connects can not satisfy the demand in oil field fully, and the oil field user presses for that join strength is higher, sealability petroleum pipeline product more reliably.

In drilling well and completion process, a lot of branch casings formed tubing string that links together, descend the oil-gas layer position of underground km and even thousands of meters, sleeve pipe will bear the effect of the multiple load such as pressure, stretching and bending of stratum and oil-gas layer, and stressing conditions is very complicated.Now the encapsulating method of the special retaining ring pipe of hermetic seal that generally uses generally adopts the seal form that the separate unit shoulder metal conical surface cooperates cambered surface the conical surface or the conical surface, and relies on tight (interference) the formed contact pressure of cooperation between the sealing contact surface and reach the purpose of sealing.When sleeve joint is subjected to doing the time spent than high pulling torque, torque shoulder very easily produces plastic deformation, thereby influences the sealing reliability of sleeve joint.

Summary of the invention

For solving the problem that exists in the above-mentioned technology, the purpose of this utility model provides two shoulder arcs to the cone sealing pipe screw connection structure, be beneficial to solve the airtight sleeve joint of common single torque shoulder under torsional interaction, torque shoulder very easily produces the problem of plastic deformation, improve the torque capability that resisted of joint, increased the reliability of sealing.

For achieving the above object, the technical solution adopted in the utility model provides a kind of pair of shoulder arc to the cone sealing pipe screw connection structure, this structure is to have box cupling that externally threaded pipe and end have internal thread by an end to screw lemon and connect and form, wherein: the internal thread of the outside thread of described pipe A and box cupling B all is set to have the taper thread of the buttress thread form thread form of self-locking property, and the end of described pipe A is provided with the first outer torque shoulder 1, outer arcuate sealing surface 3 and the second outer torque shoulder 2 successively; Be provided with successively on the relevant position that described box cupling B goes up with pipe A cooperates the first internal torque shoulder 1 ', inner conical sealing surface 3 ' the reach second internal torque shoulder 2 '.

Described buttress thread form with self-locking property, the approaching face angle of its profile of tooth is a 45, and the supporting plane angle is 0 ° of angle, and thread angle is a 45, and tooth depth is 1.40mm.

Described first, second

outer torque shoulder

1,2 and first, second internal torque shoulder 1 ', 2 ' be 0 ° of angle with the angle of the cross section of pipe A.

Described inner conical sealing surface 3 ' cone angle be 20 ° of angles, the radius of outer arcuate sealing surface 3 is R=125mm.

To be this pair shoulder arcs make the tensile strength of pipe screw joint can reach the tensile strength of body to the awl structure that is tightly connected to the beneficial effects of the utility model, improved the anti-slip performance of pipe screw joint, two shoulder designs of primary seal structure, because the increasing of area of contact, the torque capability that resisted of pipe screw joint is strengthened, avoid sealing the position plastic deformation of metal, guaranteed the sealing reliability of pipe screw joint.Simultaneously, buttress thread form has good, the last good advantage of shackle performance of technology capability, increases work efficiency.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is a connecting thread thread form enlarged view of the present utility model;

Fig. 3 is a STRUCTURE DECOMPOSITION schematic representation of the present utility model.

Among the figure:

The A-pipe B-box cupling 1-first outer torque shoulder 2-second outer torque shoulder

3-outer arcuate sealing surface 1 '-the first internal torque shoulder 2 '-the second internal torque shoulder

3 '-the inner conical sealing surface

Embodiment

Reaching example in conjunction with the accompanying drawings is illustrated the cone sealing pipe screw connection structure of the present utility model pair of shoulder arc.

As Fig. 1, shown in Figure 3, of the present utility model pair of shoulder arc includes the box cupling B that two ends have internal thread, inner conical sealing surface and two internal torque shoulders to the cone sealing pipe screw connection structure, also has two pipe A that have outside thread, outer arcuate sealing surface and two outer torque shoulder respectively to connect to form.

Internal thread on outside thread on the pipe A and the box cupling B is screwed, and the internal thread of the outside thread of described pipe A and box cupling B all is set to have the taper thread of the buttress thread form thread form of self-locking property.The end of described pipe A is provided with the first outer torque shoulder 1, outer arcuate sealing surface 3 and the second outer torque shoulder 2 successively; Be provided with successively on the relative position that described box cupling B goes up with pipe A cooperates the first internal torque shoulder 1 ', inner conical sealing surface 3 ' the reach second internal torque shoulder 2 '.

As shown in Figure 2, internal thread and the externally threaded thread form on described box cupling B and the pipe A is zigzag structure.Because the screw thread supporting plane adopts 0 ° of angle design, the design of approaching face 45, tooth depth is 1.40mm.Therefore, above-mentioned buttress thread form joint has good self-locking property under the effect of tension load, makes that the stubborn button that connects is easier, helps aboveground operation.

As shown in Figure 3, the radius of the last external sealed cambered surface 3 of pipe A is R=125mm, the inner conical sealing surface 3 on the box cupling B ' cone angle be 20 ° of angles, will form arc that metal and metal closely contact after pipe and box cupling cooperate to boring sealing configuration.Inner conical sealing surface 3 ' sealed diameter be less than the sealed diameter of outer arcuate sealing surface 3, inner conical sealing surface 3 ' and the sealed diameter of outer arcuate sealing surface 3 process according to the tolerance of design, with guarantee inner conical sealing surface 3 ' and outer arcuate sealing surface 3 between magnitude of interference can satisfy the requirement of hermetic seal.When pipe A and box cupling B twist and to connect, first, second internal torque shoulder 1 ', 2 ' for pipe A provides axially locating accurately, and contact with first,

second torque shoulder

1,2 on the pipe A.Therefore, the effect of two torque shoulder connects the moment of torsion except providing the location to twist with balance, also plays the effect of auxiliary seal.First, second

outer torque shoulder

1,2 and first, second internal torque shoulder 1 ', 2 ' the plane and pipe A axially at an angle of 90, first, second

outer torque shoulder

Concrete enforcement originally is threaded and adopts following data:

This pipe A all adopts zigzag structure with the internal and external threads that is threaded of box cupling B, and the angle that the angle of carrying side is 0 °, import the side is that 45, angle of thread are that the pitch of 45, screw thread is that the tooth depth of 5.08mm (along the axis X direction), screw thread is that the tapering of 1.40mm (perpendicular to axis of thread X), screw thread is 1: 16.

Claims

1, a kind of pair of shoulder arc is to the cone sealing pipe screw connection structure, this structure is to have box cupling that externally threaded pipe and end have internal thread by an end to screw lemon and connect and form, it is characterized in that: the internal thread of the outside thread of described pipe (A) and box cupling (B) all is set to have the taper thread of the buttress thread form thread form of self-locking property, and the end of described pipe (A) is provided with the first outer torque shoulder (1), outer arcuate sealing surface (3) and the second outer torque shoulder (2) successively; Be provided with the first internal torque shoulder (1 '), inner conical sealing surface (3 ') and the second internal torque shoulder (2 ') successively on the relevant position that described box cupling (B) is gone up with pipe (A) cooperates.

2, according to claim 1 pair of shoulder arc is to the cone sealing pipe screw connection structure, it is characterized in that: described buttress thread form with self-locking property, the approaching face angle of its profile of tooth is a 45, the supporting plane angle is 0 ° of degree, thread angle is a 45, and tooth depth is 1.40mm.

3, according to claim 1 pair of shoulder arc is characterized in that the cone sealing pipe screw connection structure: described first, second outer torque shoulder (1), (2) and first, second internal torque shoulder (1 '), (2 ') are 0 ° of angle with the angle of the cross section of pipe (A).

4, according to claim 1 pair of shoulder arc is characterized in that the cone sealing pipe screw connection structure: the cone angle of described inner conical sealing surface (3 ') is 20 ° of angles, and the radius of outer arcuate sealing surface (3) is R=125mm.