CN201687411U

CN201687411U - Anti-corrosion coupling coaxial with oil pipe

Info

Publication number: CN201687411U
Application number: CN201020170632XU
Authority: CN
Inventors: 龚育才; 陈戈; 王震
Original assignee: Wuxi Fastube Energy Development Technology Co Ltd
Current assignee: Wuxi Fastube Energy Development Technology Co Ltd
Priority date: 2010-04-27
Filing date: 2010-04-27
Publication date: 2010-12-29
Anticipated expiration: 2020-04-27

Abstract

The utility model discloses an anti-corrosion coupling coaxial with an oil pipe, wherein the coupling takes the shape of a tube, raised steps are arranged at the middle part of the inner wall tube of the coupling, annular V-shaped grooves are respectively formed at two ends of the steps combined with the oil pipe, and annular seal elements matched with the V-shaped grooves in shape are mounted in the V-shaped grooves and can efficiently prevent corrosion of liquids and oil gas to the threaded parts of the end parts of the oil pipe, therefore, the service lives of the oil pipe and the coupling are prolonged, the life cycle of a downhole string is prolonged, and the yield of an oil gas well is stabilized.

Description

A kind of anticorrosion and the box cupling coaxial with oil pipe

Technical field

The utility model relates to a kind of anticorrosion and the box cupling coaxial with oil pipe, belongs to the fastening means of the oil pipe of going into the well in oil, gas well exploitation.

Background technology

Tubing coupling is played two ends and is connected oil pipe in the down-hole, form continuous tubing string, discharges the effect of downhole fluid, at present, after pipe and box cupling were doubted and closed, the start-up portion of tube end screw thread just contacted with interior well liquid, the oil gas of tubing string fully with the intermediate inner wall of box cupling, owing to well liquid, oil gas all contain CO ₂, H ₂Multiple components corrosive medium, gases etc. such as S cause the extent of corrosion of box cupling constantly to aggravate to produce.At present, the anticorrosive measure of tubing coupling is the anticorrosion medicament to be made solid be lowered to oil well bottom, slowly melt, delay and put the anticorrosion medicament by bottom hole temperature (BHT), prevent oil pipe, coupling corrosion purpose for a long time to reach, but along with the underground mining operating mode is abominable gradually, the anticorrosion medicament is difficult to control in layer position, down-hole, causes antiseptic effect and not obvious, cause down-hole string from the screw thread break-off accident, also other downhole tool is caused sometimes and put forward evil.

The utility model content

The purpose of this utility model is in order to overcome the unmanageable defective in anticorrosion medicament medicament layer position of going into the well in the prior art, to design a kind of tubing coupling burn into that alleviates and prevent that down-hole string is from the disconnected anticorrosion oil pipe box cupling that takes off of screw thread.

The purpose of this utility model realizes by following measure:

A kind of anticorrosion and the box cupling coaxial with oil pipe, described box cupling is a tubular body, be provided with the step of projection at the middle part of described box cupling, be processed with " V " type groove of annular at the two ends that described step combines with oil pipe respectively, in described " V " type groove, be equipped with the lip ring that matches with described shape.

Advantage of the present utility model and beneficial effect are: by the end at the step of the middle part of tubing coupling inside pipe wall projection lip ring is installed, stoped the erosion of well liquid, oil gas to the oil pipe end threaded portion, thereby, improved the application life of oil pipe and box cupling, prolonged the life cycle of down-hole string, the stabilized hydrocarbon well production.

Description of drawings

Fig. 1 is the utility model structural representation.。

The specific embodiment

Below in conjunction with drawings and Examples, the specific embodiment of the present utility model is further described.Following examples only are used for the technical solution of the utility model more clearly is described, and can not limit protection domain of the present utility model with this.

Below in conjunction with accompanying drawing the utility model is described further: as can be known by accompanying drawing 1, a kind of anticorrosion of the utility model and the box cupling coaxial with oil pipe, described box cupling 3 is a tubular body, the middle part of tube wall is provided with the step of projection within it, at step and oil pipe 1, the two ends of 4 combinations are processed with " V " type groove of annular respectively, in " V " type groove, install the lip ring 2 that matches with its shape, this lip ring 2 can effectively stop well liquid, oil gas is to oil pipe 1, the erosion of 4 end thread part, prevent that down-hole string from taking off from screw threads of coupler is disconnected, prolong oil pipe, tubing coupling application life, reduced cost of production.

The above only is a preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims

1. an anticorrosion and the box cupling coaxial with oil pipe, described box cupling (3) is a tubular body, it is characterized in that, be provided with the step of projection at the middle part of described box cupling (3) inner tubal wall, be processed with " V " type groove of annular at the two ends that described step combines with oil pipe (1), (4) respectively, in described " V " type groove, install the lip ring (2) that matches with described shape.