CN201723175U

CN201723175U - Oil sleeve with conical step sealing surface and unequally spaced threads

Info

Publication number: CN201723175U
Application number: CN2010202311996U
Authority: CN
Inventors: 杨林; 胡才望; 黄淳
Original assignee: JIANGYIN CHANGJIANG OIL SPECIAL PIPE MANUFACTURE CO Ltd
Current assignee: JIANGYIN CHANGJIANG OIL SPECIAL PIPE MANUFACTURE CO Ltd
Priority date: 2010-06-18
Filing date: 2010-06-18
Publication date: 2011-01-26
Anticipated expiration: 2020-06-18

Abstract

The utility model relates to an oil sleeve with a conical step sealing surface and unequally spaced threads. The oil sleeve comprises a pipe body (1) and threads (4); the threads (4) are machined on the external side wall of the pipe body (1) at unequal space; a torque shoulder (2) is arranged on top of the pipe body (1); steps (3) are arranged outside the torque shoulder (2); the steps (3) have a conical structure; and the steps (3) have a sealing surface. The oil sleeve with the conical step sealing surface and unequally spaced threads has better sealing effects, and the threads are not easy to damage.

Description

The tubing and casing that has type conical bench sealing surface and reducing-pitch thread

(1) technical field

The utility model relates to a kind of tubing and casing, especially relates to a kind of tubing and casing that has type conical bench sealing surface and reducing-pitch thread.

(2) background technology

The tubing and casing of oil field use at present adopts the API screw thread to connect mostly.The API screw thread is because technology maturation, be easy to processing, advantages such as cost is lower, use more extensive always, but the API screw thread is owing to the reason of structure design aspect, there are many defectives that are difficult to overcome, as the low (round thread especially of bonding strength, bonding strength be body 60～80%), sealing performance is unreliable, last button control is difficult, joint stress level height, anticorrosion stress-resistant poor performance etc., simultaneously, the API screw thread of spaced set of bearing sealing function produces and rubs easily with between the shape of threads box cupling inwall in connection procedure, cause screw thread impaired, thereby not only influence the connection effect of tubing and casing and its sealing performance is also had bigger influence, cause the use of API screw thread to be restricted.Because oil gas well drilling development of technology, drilling environment are harsh day by day, also higher to the requirement of tubing and casing, common API nipple oil, sleeve pipe can't satisfy instructions for use, and the demand of special thread oil, sleeve pipe will significantly increase.

(3) summary of the invention

The purpose of this utility model is to overcome above-mentioned deficiency, and a kind of have better sealing effectiveness and the non-damageable tubing and casing that has type conical bench sealing surface and reducing-pitch thread of screw thread are provided.

The purpose of this utility model is achieved in that a kind of tubing and casing that has type conical bench sealing surface and reducing-pitch thread, include body and screw thread, on the lateral wall that is machined in body that described screw thread is not equidistant, described body top is a torque shoulder, described torque shoulder place is provided with step, described step is a pyramidal structure, and described step is a sealing surface.

The beneficial effects of the utility model are:

During use,, only need tubing and casing is screwed in the box cupling that is complementary with it, utilize the metal/metal hermetically-sealed construction to realize sealing, make tubing and casing have higher sealing effectiveness owing to be provided with the step sealing surface; Simultaneously owing to adopted not equidistant screw thread, when being rotatably connected, screw thread not can and shape of threads box cupling inwall between produce friction, thereby effectively protected the screw thread of tubing and casing.

(4) description of drawings

Fig. 1 is the utility model structural representation.

Among the figure:

Body 1, torque shoulder 2, step 3, screw thread 4.

(5) specific embodiment

Referring to Fig. 1, the utility model relates to a kind of tubing and casing that has type conical bench sealing surface and reducing-pitch thread, include body 1 and screw thread 4, on the not equidistant lateral wall that is machined in body 1 of described screw thread 4, described body 1 top is a torque shoulder 2, described torque shoulder 2 places are provided with step 3, and described step 3 is a pyramidal structure, and described step 3 is a sealing surface.

Claims

1. tubing and casing that has type conical bench sealing surface and reducing-pitch thread, it is characterized in that: described tubing and casing includes body (1) and screw thread (4), on the not equidistant lateral wall that is machined in body (1) of described screw thread (4), described body (1) top is a torque shoulder (2), described torque shoulder (2) locates to be provided with step (3), described step (3) is a pyramidal structure, and described step (3) is a sealing surface.