CN203547567U

CN203547567U - Direct connection type variable thread width oil pipe threads

Info

Publication number: CN203547567U
Application number: CN201320726577.1U
Authority: CN
Inventors: 蔡德军
Original assignee: UNI TUBE Ltd
Current assignee: UNI TUBE Ltd
Priority date: 2013-11-18
Filing date: 2013-11-18
Publication date: 2014-04-16
Anticipated expiration: 2023-11-18

Abstract

Direct connection type variable thread width oil pipe threads comprise a pipe body. Internal threads and external threads are directly machined at the two ends of the pipe body respectively, the internal threads and the external threads are all taper threads, the crests of the internal threads and the crests of the external threads are gradually widened from the end faces inwards, and the roots of the internal threads and the roots of the external threads are gradually narrowed down from the end faces inwards. The direct connection type variable thread width oil pipe threads are suitable for oil pipes with the specifications ranging from 2-3/8 inches to 13-3/8 inches, the taper sealing face design is adopted, and the sealing effect is better. A coupling-free mode is adopted, the two ends of the pipes do not need to be thickened, the internal threads are directly machined at one ends of the pipes, the external threads are machined at the other ends of the pipes, the pipes are in direct butt joint, through the coupling-free structure, the size of a borehole can be reduced in the well drilling process, the use ratio of the borehole can be improved, protruding obstacles do not exist on an inner wall and an outer wall, and resistance for going down to the well can be reduced.

Description

Direct linkage type becomes the wide OCTG screw thread of tooth

Technical field

The present invention relates to the connecting thread of the pipes such as oil exploitation industry oil pipe, sleeve pipe, be specially a kind of direct linkage type and become the wide OCTG screw thread of tooth.

Background technology

In the sleeve pipe connecting thread that oil exploitation industry is used at present, most API 5B standard threads that adopt American Petroleum Institute, the thread seal effect designing in this standard is undesirable, be not suitable for tightness is required to high occasion, and existing connected mode mostly is coupling type connected mode, connected mode complexity, loaded down with trivial details, and because the diameter of box cupling need to be greater than the diameter of tubing, therefore borehole diameter during drilling well must be greater than the diameter of box cupling, cause the utilization rate of well low, in addition the borehole wall easily bumps and stops that tubing moves in well with outstanding box cupling, cause lower well resistance larger.

Summary of the invention

Object of the present invention is exactly the defect existing for prior art, provide a kind of easy to connect, air-tightness is good without coupling straight-connecting, becomes the wide OCTG screw thread of tooth.

Technical scheme of the present invention is: comprise body, two ends of described body directly process respectively internal and external screw thread, and described internal and external screw thread is taper thread, and internal and external screw thread from end face inwards crest all broaden gradually, all narrow gradually at the bottom of tooth.

On the tube wall of described external screw thread inner side, be processed with the external screw thread transition conical surface, on the inboard wall of tube body of described internal thread inner side, be processed with successively arc-shaped transitional surface and the internal thread transition conical surface.

The tapering of described taper thread is preferably 1:(15 ± 0.1), the tapering of the described external screw thread transition conical surface and the internal thread transition conical surface is preferably 1:(4 ± 1); Described arc-shaped transitional surface is preferably R20 ± 5mm arc surface.

The benchmark pitch of described internal and external screw thread is preferably 6.0 ± 0.02mm.

The width of described internal and external screw thread crest by end face inwards each pitch preferably increase successively 0.2-0.4mm, the width at the bottom of internal and external screw thread tooth by end face inwards each pitch preferably reduce successively 0.2-0.4mm.

The tooth side angle of described internal and external screw thread thread form both sides is all preferably-3 ° ± 30 '.

High 0.8 ± the 0.1mm that is preferably of described internal and external screw thread load side tooth, and parallel with the axis of overall screw thread at the bottom of crest and tooth.

The present invention is applicable to the OCTG of 2-3/8 inch to 13-3/8 inch specification, and it adopts conical seal (contact) face design, makes sealing effectiveness better; And adopt without box cupling form, the two ends of tubing are without thickening, directly at one end of tubing machining internal thread other end threading, tubing directly docks with tubing, this borehole size can reduce drilling well without box cupling structure time, improve the utilization rate of well, and inside and outside wall is all without outstanding obstacle, reduces lower well resistance.

Accompanying drawing explanation

Fig. 1 is the connection diagram of an embodiment of the present invention;

Fig. 2 is the partial enlarged drawing that becomes the wide thread fiting part of tooth in Fig. 1;

Wherein: 1, body male end, 2, the external screw thread transition conical surface, 3, body female end, 4, become the wide thread fiting part of tooth, 5, arc-shaped transitional surface, 6, the internal thread transition conical surface.

The specific embodiment

Below in conjunction with accompanying drawing, the present invention is described further.

Referring to Fig. 1-2, a kind of direct linkage type becomes the wide OCTG screw thread of tooth, the two ends of body are machined directly to body male end 1 and body female end 3, the internal and external screw thread of body female end 3 and body male end 1 is taper thread, the tapering of taper thread is 1:(15 ± 0.1), (tapering data be two variable quantities on survey mark diameter and the ratio of axial distance); Internal and external screw thread from end face inwards crest all broaden gradually, all narrow gradually at the bottom of tooth, be preferably designed for: the width of internal and external screw thread crest by end face inwards each pitch increase successively 0.2-0.4mm, the width at the bottom of internal and external screw thread tooth by end face inwards each pitch reduce successively 0.2-0.4mm.On the tube wall of external screw thread inner side, be processed with the external screw thread transition conical surface 2, on the inboard wall of tube body of internal thread inner side, be processed with successively arc-shaped transitional surface 5 and the internal thread transition conical surface 6.The tapering of the external screw thread transition conical surface 2 and the internal thread transition conical surface 6 is 1:(4 ± 1); Arc-shaped transitional surface 5 is R20 ± 5mm arc surface.The benchmark pitch of internal and external screw thread is 6.0 ± 0.02mm.The tooth side angle of internal and external screw thread thread form both sides is all preferably-3 ° ± 30 '.Internal and external threads load side tooth is high is 0.8 ± 0.1mm, and parallel with the axis of overall screw thread at the bottom of crest and tooth.

When sleeve pipe or oil pipe connection, tooth is wide is threaded togather (forming the wide thread fiting part 4 of change tooth in figure) by becoming for the body male end 1 of two bodys that directly will dock and body female end 3.

Claims

1. a direct linkage type becomes the wide OCTG screw thread of tooth, comprise body, it is characterized in that: two ends of described body direct processing internal and external screw threads respectively, described internal and external screw thread is taper thread, and internal and external screw thread from end face inwards crest all broaden gradually, all narrow gradually at the bottom of tooth.

2. direct linkage type according to claim 1 becomes the wide OCTG screw thread of tooth, it is characterized in that: on the tube wall of described external screw thread inner side, be processed with the external screw thread transition conical surface, on the inboard wall of tube body of described internal thread inner side, be processed with successively arc-shaped transitional surface and the internal thread transition conical surface.

3. direct linkage type according to claim 2 becomes the wide OCTG screw thread of tooth, it is characterized in that: the tapering of described taper thread is 1:(15 ± 0.1), the tapering of the described external screw thread transition conical surface and the internal thread transition conical surface is 1:(4 ± 1); Described arc-shaped transitional surface is R20 ± 5mm arc surface.

4. according to the arbitrary described direct linkage type of claim 1-3, become the wide OCTG screw thread of tooth, it is characterized in that: the benchmark pitch of described internal and external screw thread is 6.0 ± 0.02mm.

5. direct linkage type according to claim 4 becomes the wide OCTG screw thread of tooth, it is characterized in that: the width of described internal and external screw thread crest by end face inwards each pitch increase successively 0.2-0.4mm, the width at the bottom of internal and external screw thread tooth by end face inwards each pitch reduce successively 0.2-0.4mm.

6. direct linkage type according to claim 5 becomes the wide OCTG screw thread of tooth, it is characterized in that: the tooth side angle of described internal and external screw thread thread form both sides is-3 ° ± 30 '.

7. direct linkage type according to claim 6 becomes the wide OCTG screw thread of tooth, it is characterized in that: the high 0.8 ± 0.1mm of being of described internal and external threads load side tooth, and parallel with the axis of overall screw thread at the bottom of crest and tooth.