RU2305745C1 - Downhole casing pipe vibrator - Google Patents

Abstract

FIELD: well construction, particularly casing pipe cementing equipment.

SUBSTANCE: vibrator comprises hollow body with connection threads, valve, bypass channel and bypass channel closing member. Body is connected to pipe string to be lowered in casing pipe and is sealed from below. Body has upper, lower and central rows of radial orifices. Upper and lower channels are connected from outside through bypass channel formed by cylindrical bush rotationally installed on the body. The bush is provided with auger-shaped partition and with bypass channel closing member, which are installed in bypass channel. Bypass channel closing member is made as cylindrical insert fixedly connected with cylindrical bush from inner side thereof and partly closing central row of radial orifices. The insert has depressions, which may be periodically aligned with central orifice row as cylindrical bush rotates with respect to the body.

EFFECT: simplified structure and increased operational reliability.

2 dwg

Description

The invention relates to the construction of wells, and in particular to devices for cementing casing strings.

Known vibration shoe cemented columns (RF patent No. 2061841, IPC 7 ЕВВ 33/16, published in Bull. No. 16 from 06/10/1996), including a hollow body with side holes, connecting thread and safety valve, a cylinder made of easily drilled material with cavity, the input channel communicating the body cavity with the cylinder cavity and the output axial channel communicating the cylinder cavity with the outer space, a gear wheel made of easily drilled material on the easily drilled shaft, placed in the cavity, a nozzle of easily drilled material a piece placed in the inlet channel and oriented in the region of the pitch diameter of the gear and a guide plug, the cylinder being made with a pocket and a cavity in the form of a cylindrical cavity, which is covered by a disk having a pocket and an eccentric hole, and the gear shaft is made with an unbalance in in the form of a sleeve with an eccentric plate circle and mounted along the axis of the cylindrical cavity in the pockets of the cylinder and the disk with the possibility of opening and closing a plate with a plate circle of an eccentric hole, while the input channel It made tangential with respect to the cylindrical cavity, and the lateral opening of the housing formed by the disc on the cylindrical axis of the cavity.

The closest in technical essence to the proposed one is the casing shoe (copyright certificate SU No. 1661372, IPC 7 ЕВВ 33/14, published in Bul. No. 25 of 07/07/1991), including a hollow body with a passage through the upper and lower sub a piston-valve located inside the housing with protrusions on the outer surface in the upper part, spring-loaded relative to the upper sub, and a rod passing inside the piston-valve and connected by the lower end to the lower sub, while the piston-valve is made with two internal cavities, section lennymi annular shoulder forming the axial bore and has a member for closing this channel, wherein the member overlaps the axial bore in the upper position of the piston valve and opening the latter in lowered position.

Both analog and prototype have common disadvantages:

firstly, the complexity of the design, due to the large number of nodes and parts;

secondly, the complexity of manufacturing and assembly, due to the large number of technologically complex parts, which undoubtedly increases the cost of the product, and failure to meet stringent requirements in the manufacture and assembly reduces the reliability of the device.

An object of the invention is to simplify the design of the device and increase the reliability of its operation.

The stated technical problem is solved by the proposed casing borehole vibrator, including a hollow body with connecting threads, a valve, a bypass channel and an element of overlapping this channel.

What is new is that the casing is connected to the string of pipes lowered into the casing, is sealed from below and provided with upper, middle and lower rows of radial holes, and the upper and middle channels are connected externally by a bypass channel formed by a cylindrical sleeve mounted on the casing to rotate and equipped with a partition in the form of a screw and an overflow channel overlap element that are installed in the bypass channel, the overlap element of this channel being made in the form of a cylindrical insert, rigidly connected hydrochloric inside with a cylindrical sleeve partially overlapping the middle row of radial holes and equipped with samples that are configured to periodically align with the average number of perforations during rotation of the cylindrical sleeve relative to the housing.

The figure 1 shows the proposed device before cementing the casing in longitudinal section.

The figure 2 shows a section aa.

The downhole vibrator for the casing string includes a hollow body 1 with a connecting thread 2 and a plug 3 at the end, a valve 4, a bypass channel 5 and an overlap element 6. The housing 1 is connected to the pipe string 7 (for example, the tubing string) from the top casing 8.

The housing 1 is bottom and equipped with upper 9, middle 10, lower 11 rows of radial holes, the upper 9 and middle 10 rows of radial holes are connected externally by bypass channel 5. The bypass channel 5 is formed by a cylindrical sleeve 12 mounted on the housing 1 with the possibility of rotation relative to the housing 1 , for example, by means of balls 13 (see FIG. 2) installed in the inverted grooves of the housing 1 and the cylindrical sleeve 12 at the upper and lower ends of the housing 1.

The cylindrical sleeve 12 is equipped with a partition 14 in the form of a screw and an element of overlap 6, which are installed in the bypass channel 5.

The overlap element 6 of the bypass channel 5 is made in the form of a cylindrical insert 15, rigidly connected from the inside to the cylindrical sleeve 12 and partially overlapping the middle row of radial holes 10. The cylindrical insert 15 is equipped with samples (not shown in FIGS. 1 and 2), which are made with the possibility of periodic alignment with the middle row of holes 10 during rotation of the cylindrical sleeve 12 relative to the housing 1.

The lower row of radial holes 11 of the housing 1 hydraulically communicates the interior spaces of the pipe string 7 and the casing 8. The arrangement of the lower part of the casing 8 and the arrangement attached to the bottom of the housing 1 of the downhole vibrator for the casing may be different. As an example, consider one of the layout options, which is presented in the figure.

Bottom to the plug 3, the housing 1 by means of a shear element 16 is attached to the check valve 17, made in the form of a hollow muffled from the bottom of the cylinder having an outer cylindrical sample 18, in which there is a retaining ring 19 that can interact with the cylindrical sample 20 of the seat 21. The seat 21 is hermetically installed in the casing 8 above the central back pressure valve (CKOD) 22 and connected to the latter via an adapter 23. A shoe pipe 24 with through holes is screwed onto the lower end of the CKOD 22. and 25, hydraulically connecting the inner space of the casing 8 with its outer space. Unauthorized fluid flows are eliminated by the sealing elements 26. The partition 27 with through holes is mounted rigidly in the housing 1 below the upper row of radial holes 9 and restricts the movement of the valve 4 up.

The device operates as follows.

In the casing string 8, arranged and lowered into the well, at the end of the pipe string 7 (see FIG. 1), a downhole vibrator for the casing string is lowered, while the lower end of the pipe string 7 is screwed into the connecting thread 2.

The pipe string 7 is gradually increased and the device is lowered into the casing 8 until the check valve 17 reaches TsKODa 22, while the layout elements are calculated so that the lower end of the housing 1 is 5-10 meters above the seat 21. Produce cementing the casing 8, while in the pipe string 7 from the wellhead pumped cement, which, reaching the borehole vibrator for the casing, since valve 4 blocks the further movement of the cement through the hollow body 1, t through the upper row of radial holes in the bypass channel 5, while the cement mortar continues to be pumped and the cement, moving down the bypass channel 5, acts on the baffle 14 of the cylindrical sleeve 15, made in the form of a screw, as a result of which the cylindrical body 12 comes into rotational motion relative to the housing 1. Cement mortar, moving down the bypass channel 5, reaches a cylindrical insert 15, equipped with samples (not shown in figures 1 and 2), installed opposite the middle row of radial aperture 10. Since the cylindrical body 12 rotates relative to the body 1, and the cylindrical insert 15 equipped with samples is rigidly connected to the cylindrical body 12, the middle row of radial holes 10 is periodically connected to the bypass channel through the samples of the cylindrical insert 5. A pulsating movement of the cement mix occurs inside the housing 1 below the middle row of radial holes 10.

Due to the periodic communication of the bypass channel 5 with the inner space of the housing 1 through the middle row of radial holes 10, a pulsating injection of cement occurs, which through the inner space of the housing 1 through the lower row of radial holes 11 enters the inner space of the casing 8 through the saddle 21 and through the adapter 23 , TsKOD 22 and further through the through holes 25 of the shoe 24 into the outer space of the casing 8, cementing the latter.

At the end of cementing the casing string 8, the injection of cement into the pipe string 7 is stopped. TsKOD 22 closes under pressure of a column of cement behind the casing 8. The pipe string 7 is lifted up until the check valve 17 hermetically interacts with the seat 21. After that, an additional load of about 40-50 kN is applied to the pipe string 7 from the wellhead until the shear elements 16 are destroyed. After the shear is destroyed elements 16, the pipe string 7 is lifted another 2-3 meters, while the check valve 17 with the retaining ring 19 located in its outer cylindrical sample 18 is fixed in the cylindrical sample 20 of the saddle 21.

Then, backwash (supply of flushing fluid to the casing 8) removes excess cement from the pipe string 7 and the borehole vibrator for the casing.

The proposed borehole vibrator for the casing consists of technologically simple parts, which allows to reduce material costs for manufacturing and assembly, and the increase in reliability in operation is due to the simplification of the design of the device.

Claims (1)

A downhole vibrator for a casing string, comprising a hollow body with connecting threads, a valve, a bypass channel and an overlap element of this channel, characterized in that the body is connected to a string of pipes lowered into the casing, is muffled from below and provided with upper, middle and lower rows of radial holes and the upper and middle channels are connected externally by a bypass channel formed by a cylindrical sleeve mounted on the housing with the possibility of rotation and equipped with a partition in the form of a screw and an element of overlap the bypass channel, which are installed in the bypass channel, and the overlap element of this channel is made in the form of a cylindrical insert, rigidly connected from the inside with a cylindrical sleeve, partially overlapping the middle row of radial holes and equipped with samples that are made with the possibility of periodic alignment with the middle row of holes during rotation of the cylindrical bushings relative to the housing.

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