SU1716108A1 - Hydraulic hammer for bottomhole treatment - Google Patents

Abstract

The invention relates to the oil industry, can be used to increase oil recovery, as well as to conduct well development operations and provides the creation of the necessary impact pressure on the formation while controlling the frequency of pulses from the surface. The purpose of the invention is to increase efficiency by providing a sufficient energy capacity for an impact impact on the bottomhole zone. The device comprises a housing with radial channels associated with the column pipe, a spring-loaded sleeve and a stopper. The sleeve is made in the form of a glass with a ball valve seat and radial windows. On the outer surface of the glass there is a groove for the lock balls, and the stopper is made in the form of a spring-loaded annular piston installed in the housing and having an annular rim on the inner surface for the lock balls. 1 hp f-ly, 2 ill. w e

Description

The invention relates to the oil and gas industry, can be used to increase oil recovery, as well as to conduct well completion operations and provides the creation of the necessary shock pressure on the formation while controlling the periodicity of pulses from the surface.

A device for influencing the bottomhole zone, made in the form of a housing, in which a movable sleeve with openings for the passage of fluid is installed, is known. The device provides the creation of impulse efforts without its rise to the surface.

A disadvantage of the known device is its complexity and insufficient effectiveness of the pulsed effect on the formation.

Closest to the present invention is a device for cleaning the well bottom-hole zone, made in the form of a housing with radial channels mounted on a tubing string. A movable sleeve is installed in the housing cavity to control the overlapping of the flow channels. The locking of the sleeve in the working position is carried out by a locking device in the form of concentric springs supported on the sleeve of the sleeve.

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A significant disadvantage of the known construction is its low efficiency, since the operation of the locking device occurs in an arbitrary mode, which affects the energy of the pulse effect. The analysis of the energy characteristics of this device significantly affects the quality of the impact on the formation and may in some cases lead to irreversible negative pressures.

The purpose of the invention is to increase efficiency by providing a rated power supply of a pulsed effect while ensuring the accuracy of the locking mechanism.

The essential difference of the proposed device is the implementation of a stopper in the form of a controlled ball lock with a piston pressure element. The device sleeve is made in the form of a glass with an annular groove for a ball lock with a central bore, in the upper part of which a seat for a ball valve is placed.

FIG. 1 shows the device, general view, section; in fig. 2 is the same as the embodiment.

The device is made in the form of a prefabricated structure consisting of a housing 1, in the body of which a movable sleeve 2 is mounted. Structurally, the sleeve 2 is made in the form of a cup with radial windows 3 and an annular groove 4 on the outer surface of its body. The groove 4 holds the sleeve 2 by means of balls 5 placed in the holes of the housing 1. The position of the balls 5 is controlled by an annular piston 6 placed in the housing and raised to the upper position by a thoriated 7. The body of the annular piston 6 also has an annular groove 8 for placing balls 5.

To ensure that the device operates, the connecting channels 9 and radial channels 10 are located in the body of the housing 1. The geometrical parameters of the channels 10 are selected from the conditions of their alignment with the radial windows 3 at the lower position of the sleeve 2. In the upper position of the sleeve 2, the passage channels of the window 3 and channels 10 are blocked and divide the cavities A and B.

The return of the sleeve 2 to the upper position is provided by the spring 11 installed in the seat of the housing 1.

The device works as follows.

Previously, the device on the pump-compressor pipes is lowered to the bottom of the well, and on the surface

bind with pumping and pressurized aggregates. According to the results of geophysical studies, the mode of pulsed processing is established and the required type of operation of the locking device is set (select the type of device).

In the initial period, the cavities A and B are disconnected between each other and the sleeve 2 is in its extreme upper position. Upon reaching a predetermined impulse treatment pressure, the pressure is transmitted through the channels 9 to the annular piston 6, which, under the influence of pressure, compressing the spring 7, moves downwards. When the position of the coincidence of the groove 8 with the ball placement zone is reached, the latter are extruded by the sleeve 2 into the groove cavity. it

ensures separation of sleeve 2 and housing 1. After release of sleeve 2, it moves downward under pressure, compressing spring 11. When the extreme lower position of sleeve 2 is reached, radial windows 3 and radial channels 10 align, which ensures discharge of fluid from cavity A into cavity B and the creation of a pulse, pressure on the bottomhole zone.

After the bottomhole pressures equalize, the sleeve 2 under the influence of the spring 11 moves to the upper position, on reaching which the balls 5 enter the groove of the sleeve 2 and stop it. Ring piston 6 under

by the action of the spring 7 also moves to the upper position and locks the ball lock. The device is brought to its original position and can be reused when controlling pumping units.

An embodiment of the proposed device is made in the form of a composite structure consisting of a body 12, in which the movable

the sleeve 13 is installed, raised by the spring 14, the sleeve 13 is made in the form of a cup with radial holes 15 and an outer annular groove 16 for the balls 17 forming the ball gate (Fig. 2).

In the lower part of this device of the sleeve 13 there is a seat 18 for the ball 19. In addition, an annular piston 20 is movably mounted in the body of the body 12, the body of which also has a groove 21 for the balls 17.

To ensure the upper position of the annular piston 20 there is a thoriated spring 22 placed in housing 12. In addition, in housing 12 there are channels 23 and radial channels 24, the cross section of which coincides with the radial windows 15 with the sleeve 13 stuck in position. 1 also has an axial bore 25.

During operation, the device is mounted on tubing pipes and lowered to the bottom: The mouth is tied up by means of pipelines with pumping units, ensuring the creation of the necessary working pressure. Unlike the first version of the device, initially the ball 19 is not installed in the device, which allows you to lower the necessary devices through the orifice or to carry out, for example, acid treatment of the bottom-hole zone. After all the necessary work has been completed, the ball 19 is thrown, which ensures the separation of volumes A and B.

When the pressure is applied and the required pre-set value is reached, the downward piston 20 moves down. If the extreme lower position is reached, the groove coincides with the position of the balls 17, which diverge and release the sleeve 13. Under the pressure of the liquid column, the sleeve 13 moves down until the radial windows 15 and radial channels 24, which ensures the discharge of fluid from the cavity A into the cavity B and creates an impact on the reservoir.

After equalizing the pressures in cavities A and B, the sleeve 13 under the influence of the spring 14 moves upward and when the groove 16 reaches the position of the balls 17, it stops. To lock the locking mechanism, the annular piston 20 also moves upward to its highest position. The device is cocked, the cavities A and B are again disconnected and repeated exposure is possible.

The proposed device is made in the form of a prototype and tested. Testing has shown its high efficiency and the possibility of performing an impact after acidizing a formation or other technological operations.

Claims (2)

1. A device for conducting hydraulic impacts on the bottomhole formation zone containing a hollow body associated with a column pipe with grooves and radial channels, a spring-loaded sleeve installed in the case with grooves and radial channels positioned in combination with the radial channels of the body and the stopper installed in the original position in the grooves and grooves, respectively, of the housing and the sleeve, differing in that, in order to increase efficiency by providing sufficient energy capacity of the impact on the face-to-face zone, it is provided with an annular piston with cavities under the stopper, spring-loaded relative to the housing, the housing has an annular cavity to accommodate the annular piston, and the sleeve is shaped as a cup, with the over-piston part of the annular cavity communicated with the intrapipe space above the spring-loaded sleeve, piston - with the inner pipe space below the spring-loaded sleeve, and the stopper is made in the form of a ball lock, installed with the possibility of fixation in the body of the annular piston when axially moving pos ednego. 2. The device according to claim 1, wherein the beaker is made with a central bore hole, in the upper part of which is a seat for a ball valve. 12 Editor M.Petrova Tehred M. Morgenthal Order 593 Circulation Subscription VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, 4/5 Raushsk nab. Production and Publishing Combine Patent, Uzhgorod, Gagarin st., 101 Proofreader L. Beskid