CN2923992Y

CN2923992Y - Self-locking rubber cork

Info

Publication number: CN2923992Y
Application number: CN 200620121483
Authority: CN
Inventors: 顾维亮; 于遵洪; 高本文; 尹志民
Original assignee: Karamay Jinxin Science & Technology Co Ltd
Current assignee: Karamay Jinxin Science & Technology Co Ltd
Priority date: 2006-06-29
Filing date: 2006-06-29
Publication date: 2007-07-18
Anticipated expiration: 2016-06-29

Abstract

The utility model relating to a cementing slush-displacement rubber stopper applied in oil and gas field exploration of petroleum industry in particularly relates to a self-lock rubber stopper. The utility model mainly comprises a rubber stopper (1), an O-shaped gasket ring (2), a lock head (3), a self-lock steel ball (4), a self-lock seat (5), a huge gasket pad (6). The inner cavity of the bottom end of self-lock seat (5) is processed to be a tapered surfaced with a self-lock angle. The tapered surface is matched with the bottom end of the lock head (3); A plurality of holes are arranged equally on the lock head (3), an angle formed by the axes of the holes and the lock head body equals to the self-lock angle, a plurality of steel balls are positioned in the holes. The lock head (3) is connected with the rubber plunger (1) in a screwed way, the huge gasket pad (6) is sleeved with the self-lock seat (5). The utility model adopting the scheme of that: the steel balls in the lock head match to the tapered surface with a self-lock angle on the self-lock seat, thus realizing the self-lock function and improving the stability of rubber stopper self-lock.

Description

A kind of self-locking plug

Technical field

The utility model relates to the cementing tool that oil-gas field development uses in the petroleum industry, particularly a kind of self-locking plug.

Background technology

In the well cementing operation process, the normal self-locking plug with multistage dish wing that adopts is used for isolating displacement fluid (or drilling fluid) and cement paste, prevents to move on the sleeve pipe plug (and cement paste backflow) and finishes " bruising " and the device of " self-locking ".Therefore the self-locking reliability of self-locking plug is very important, the structure of conventional self-locking plug is that the lock head bit strip has a retainer on the plug, rely on the jagged hangnail on retainer and the lock to carry out self-locking, but in use, often exist problems such as retainer fracture or retainer can not open, cause the plug self-locking to lose efficacy, thereby influence cementing quality, these problems are perplexing well cementing operation person always, and therefore existing self-locking plug device is anxious to be waited to improve and develop.

Summary of the invention

The purpose of this utility model is to provide a kind of reliability that can improve the plug self-locking, thereby improves the self-locking plug device of cementing quality.

The utility model is processed as the conical surface with self-locking angle mainly by plug 1, O RunddichtringO 2, tapered end 3, self-locking steel ball 4, form from lock 5, huge sealing mat 6 from lock 5 bottom inner chambers, and this conical surface and tapered end 3 bottoms are suitable; Be evenly equipped with several holes on the tapered end 3, angle equals from the locking angle between the axis of axially bored line and tapered end body, and steel ball is installed in the hole; Tapered end 3 adopts with plug 1 and is threaded, and is set with huge sealing mat 6 on lock 5.

The utility model adopts the steel ball of tapered end the inside and have a realization self-locking that matches of the conical surface from the locking angle on lock, has improved the reliability of plug self-locking.

Description of drawings

Fig. 1 the utility model structural representation

The specific embodiment

The utility model is described in more detail below in conjunction with accompanying drawing 1.

During use self-locking steel ball 4 packed in the tapered end 3 that has the inclined-plane, tapered end 3 links together with plug 1 then. when setting of casing, will be contained in the design choke position, when well cementation from lock 5, plug is sent to this position, when tapered end contacted with lock, the self-locking steel ball made progress along inclined hole, made tapered end reach the lock bottom smoothly, steel ball falls, when down-hole pressure upwards promoted tapered end, steel ball was pinned by the conical surface of lock bottom, thereby pinned the effect that plug plays unidirectional choked flow.

Claims

1, a kind of self-locking plug, mainly by plug (1), O RunddichtringO (2), tapered end (3), self-locking steel ball (4), form from lock (5), huge sealing mat (6), it is characterized in that: inner chamber is processed as the conical surface with self-locking angle from lock (5) bottom, and this conical surface and tapered end (3) bottom are suitable; Tapered end is evenly equipped with several holes on (3), and angle equals from the locking angle between the axis of axially bored line and tapered end body, and steel ball is installed in the hole; Tapered end (3) adopts with plug (1) and is threaded, and is set with huge sealing mat (6) on lock (5).