SU1375795A1 - Pipe head - Google Patents

Abstract

The invention relates to the mining industry, in particular, to wellhead fountain equipment and improves the reliability of the pipe head by preventing axial movement of the pipe holders (T) 2 with the pipe string upward from the intra-well pressure. The head contains a housing (K) 1 and placed in it T 2 with a blocking element and a node

Description

ft and} 3 s

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her pr has eaten

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fsh tions The latter includes a clip

3, tightly coupled with T 2 and collet

4, mounted inside the cage 3 fixed. The protrusions (c) of the 5 collet 4 rest on the upper end of the cage 3. The locking element is arranged movably inside the collet 4 of the bushings 7. A preventer is installed on the flange K 1. During the landing process T 2 the collet 4 contracts, passes T 2 and

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K.1 through the preventer. Then the collet 4 expands, and its B 5 is fixed in an annular groove 18 K 1. Pressurization moves the sleeve 7 in the collet 4, Viluka 7 locks the B 3 in the groove 18. The axial force of the downhole pressure is perceived only by B 5, and the component force Reaction K 1 has a radial direction. 3 il.

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The invention relates to the mining industry, in particular to wellhead fountain equipment, and is intended for suspending the tubing of tubing tubing and sealing the annulus of oil and gas wells.

The aim of the invention is to increase the reliability of the tube head operation by preventing axial movement of the tube holder with the pipe string upward from the well pressure.

Fig. 1 shows a pipe head in the operating state, the general view in Fig. 2 is section A-A in Fig. 1; on fig.Z - the position of the protrusions of the collet and the locking sleeve at the time of descent (lifting) pipe holders.

The pipe head consists of body 1, tube holder 2, fixing unit for tube holder, including

rigidly associated with the holder 3, inside which is fixedly mounted a hinge 4 with lugs 5 at the end, abutting with the lugs 5 in the upper end 6 of the yoke 3. A collet 7 in the form of a sleeve is located above the collet 4 between the pipe holder 2 and the body 1 and limiter 8. In the housing there are channels 9 and 10, which communicate closed cavities 11 and 12 formed by housing 1, tube holder 2, bush 7, limiter 8 and sealing elements 13-17 with the wellhead flow control station. To fix the protrusions 5 of the collet 4, an annular groove 18 is made in the housing 1.

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Pipe head works as follows.

A preventer is installed on the flange of the body 1 of the tubular head, through which the elevator string is lowered into the well. A threaded tube 2 assembled with a sleeve 3 rigidly connected to a tube holder 2, a collet 4 fixedly mounted (for example, using pins 19) inside the sleeve with an abutment of the collet protrusions on the upper end of the sleeve, and a stop 8 The sleeve 7 is retracted to the extreme upper position — until it stops at the end face of the restrictor — and the tube holder 2 is lowered and fitted into the housing 1. During the fitting process of the tube holder 2 of the collet 4, due to its elasticity, it is compressed to allow the tube holder to freely pass through torr and the housing passage 1. After planting tube holder 2 in the housing 1, the collet 4, the strut to, assumes its original position and the protrusions 5 are fixed in the annular groove 18 of the housing 1. I

The precise orientation of the protrusions 5 of the collet 4 relative to the annular groove of the body is ensured by a rigid connection of the casing 3 with the tube holder, the fixed installation of the collet 4 inside the casing 3 and the geometric dimensions of the protrusions 3 of the collet 4.

By applying pressure (hydro- or pneumo-) from the control station to the cavity} 1 above the sleeve 7, the sleeve 7 is displaced all the way into the tube holder shoulder, and thereby the sleeve 7,

Moving in the collet 4, locks the protrusions 5 of the collet 4 in the annular groove of the housing. In the case of occurrences in the well, the axial force from the downhole pressure is transmitted through the tube holder 2 and the upper end of the sleeve 3 rigidly connected to the tube holder 3 to the shoulders of the protrusions 5 of the collet 4 locked by the sleeve 7 in the annular groove of the body 1,

The rigid connection of the cage with the pipe holder and the fixed installation inside the cage of the collet, supported on the upper end of the cage, ensures that this force is perceived only by the protrusions of the collet, freeing the body of the collet from the load. The component reaction force of the body, acting through the protrusions 5 of the collets on the sleeve 7, has only a radial direction, pressing the sleeve to the tube holder, i.e. there are no forces seeking to withdraw sleeve 7 from interaction with collet 4. This ensures reliable fastening of the tube holder in the housing in the most critical situations (development in the well), and the ability to control the process of fastening the workpiece-4zA remotely.

The holder is a new effect in similar designs.

Dp of lifting the tube holder 2, the pressure from the station is fed into the cavity 12 under the sleeve 7, which, moving up, releases the protrusions of the collet 4.

Claims (1)

Invention Formula A tubular head containing a housing and a tubular holder accommodated therein with a blocking element and a fixing unit including a holder and a collet, characterized in that, in order to improve the reliability of the tubular head by preventing axial movement of the tubular holder with the tubing up from the downhole pressure , the sleeve is rigidly connected to the tube holder, the collet is fixed inside the sleeve, and the collet projections abut against the upper end of the sleeve, wherein the blocking element is designed as a sleeve disposed inside the collet, installed with the possibility of reciprocating movement and interaction with the collet tabs. FIG. 2 Yu Phage.Z