CN201723168U

CN201723168U - Oil casing with double-step tapered sealing surface and unequally spaced threads

Info

Publication number: CN201723168U
Application number: CN2010202401511U
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: 2010-06-24
Filing date: 2010-06-24
Publication date: 2011-01-26
Anticipated expiration: 2020-06-24

Abstract

The utility model relates to an oil casing with double-step tapered sealing surface and unequally spaced threads. The oil casing comprises a casing body (1) and threads (5), wherein the threads (5) are processed on the outer side wall of the casing body (1) with unequal distances; the top of the casing body (1) is provided with a torque circular bead (2) which is provided with a one-stage step (3); the one-stage step (3) is in a tapered structure; and a two-stage step (4) is arranged between the one-stage step (3) and the threads (5). The oil casing with double-step tapered sealing surface and unequally spaced threads has better sealing effect, and the threads are not easy to damage.

Description

The tubing and casing that has double step conical seal (contact) face 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 double step conical seal (contact) face 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 double step conical seal (contact) face 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 double step conical seal (contact) face and reducing-pitch thread, described tubing and casing includes 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 the one-level step, described one-level step is a pyramidal structure, is provided with two stage steps between described one-level step and the screw thread.

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, be provided with the two-stage step simultaneously and carry out primary seal, 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, one-level step 3, two stage steps 4, screw thread 5.

(5) specific embodiment

Referring to Fig. 1, the utility model relates to a kind of tubing and casing that has double step conical seal (contact) face and reducing-pitch thread, include body 1 and screw thread 5, on the not equidistant lateral wall that is machined in body 1 of described screw thread 5, described body 1 top is a torque shoulder 2, and described torque shoulder 2 places are provided with one-level step 3, and described one-level step 3 is a pyramidal structure, be provided with two stage steps 4 between described one-level step 3 and the screw thread 5, described one-level step 3 and two stage steps 4 are sealing surface.

Claims

1. tubing and casing that has double step conical seal (contact) face and reducing-pitch thread, it is characterized in that: described tubing and casing includes body (1) and screw thread (5), on the not equidistant lateral wall that is machined in body (1) of described screw thread (5), described body (1) top is a torque shoulder (2), described torque shoulder (2) locates to be provided with one-level step (3), described one-level step (3) is a pyramidal structure, is provided with two stage steps (4) between described one-level step (3) and the screw thread (5).