RU41794U1 - DEPRESSION DEVICE - Google Patents

Abstract

Depression device containing a mechanical packer and a filter located below it with support on the bottom, characterized in that it is equipped with a barrel on which an adjusting nut, a packer with sealing elements, inner and outer bushings are installed between the upper and lower thrust elements with the possibility of axial movement relative to each other when the pins are cut, by means of which the bushings are fixed in their initial position, and the upper sub, and a support is fixed at the end of the barrel coupling with a hollow tip, in which the fitting is installed and under it in the lower part of the upper sub covering the support sleeve, a sealing plug is installed with a shear pin installed under it, and a lower sub connected to the filter is fixed on the upper sub and a check valve is installed in it the latter being located below the sealing plug and a drop limiter for the sealing plug is installed above it when it leaves the upper sub.

Description

The utility model relates to the oil and gas industry, in particular, to technical means for creating depression on a productive formation when developing wells after drilling or carrying out technological operations to influence the bottom-hole formation zone.

A device for depressive and repressive effects on productive formations containing a mechanical packer and a filter located below it with support on the bottom (see, RF patent No. 2227208, CL. E 21 B 43/25, 04/20/2004).

This device allows the processing of the near-wellbore region only by generating pressure pulses in the well, which reduces the possibility of its use.

The task to which the utility model is directed is to increase the reliability of a depressive device and expand its functionality.

This problem is solved due to the fact that the depression device contains a mechanical packer and a filter located below it with support on the bottom, and the depression device is equipped with a barrel on which an adjusting nut, a packer with sealing elements, inner and outer bushings installed between the upper and lower thrust elements with the possibility of axial movement relative to each other when cutting the pins, through which the bushings are fixed in their original position, and the upper a sub, and a support sleeve with a hollow tip is fixed at the end of the barrel, in which a fitting is installed and under it in the lower part of the upper sub covering the support sleeve, a sealing plug is installed with a shear pin installed underneath, while the lower sub is attached to the upper sub with a filter, and a check valve is installed in it, the latter being located below the sealing plug and a drop limiter of the sealing plug is installed above it when it leaves the upper sub.

Implementation of the device with a barrel, an adjusting nut, inner and outer bushings, pins fixed to each other and installed between the upper and lower thrust elements, the upper sub, the support sleeve with a hollow tip and a fitting installed in it, which seals

cork located in the upper sub, lower sub and filter with check valve allows you to:

- at the same time, ensure that the production casing is closed by the packer sealing elements and the liquid is opened to the pipe string (tubing);

- create the necessary design depression on the reservoir and the rate of change of the bottomhole pressure when installing the nozzle with the estimated diameter of the bore;

- remove contaminated fluid from the reservoir into the tubing by backwashing or by lifting the tubing with fluid depending on the reservoir pressure;

- to evaluate the productivity and filtration properties of the reservoir and bottomhole zone in the process of well development.

As a result, the problem posed in the utility model was solved — improving the reliability and efficiency of the device while expanding its functionality.

The drawing shows a longitudinal section of a depressive device. The depression device comprises a barrel 2 connected to the head 1 and an adjusting nut 3. A packer 4 with sealing elements is placed on the barrel 2

- rubber cuffs 23, the inter-washer 5, the upper thrust element 6, the inner sleeve 7 and the outer sleeve 8, fixed to each other by shear pins 9, the lower thrust element 10c mounted on it by the upper sub 11. On the lower part of the barrel 2 is fixed support sleeve 12 sec a hollow tip, in which the fitting 13 is located. In the lower part of the upper sub 11, a sealing plug 14 is fixed under the shear pin 15. The lower sub 16 with the coupling 17 is connected to the upper sub 11 and placed th therein limiter 18 fall sealing plug 14. By coupling 18, through the pipe 19, filter 21 is fixed (in the drawing shows a tubular filter) with non-return valve 20 and a plug 22.

The sealing device operates as follows.

On the pipe string (tubing), the device descends all the way to the bottom of the well by the filter 21. The length of the filter is selected so that the rubber cuffs 23 of the packer 4 when the filter 21 reaches the bottom are located above the upper perforation interval. When the bottom reaches under the weight of the tubing, the barrel 2 and the support sleeve 12 with a hollow tip, the head 1, the adjusting nut 3 and the upper stop element 6 continue to move downward, as a result of which the pins 9 are cut off between the inner sleeve 7 and the outer sleeve 8. The rubber is compressed cuffs 23 of the packer 4 and separation of the above-packer and sub-packer zones of the well. Hollow at the same time

with the tip of the support sleeve 12, the sealing plug 14 is pushed out, cutting off the pin 15. At the same time, the free play of the upper stop element 6 relative to the inner sleeve 7 and the outer sleeve 8, as well as relative to the lower stop element 10, allows the sealing plug 14 to be reliably pushed out when the rubber is completed cuffs 23 of the production casing with any wall thickness, since the calculated cutting force of the pins 9 is approximately 0.8 of the compression force of the cuffs 23 calculated for the maximum internal ametr production string.

After the release of the sealing plug 14 from the upper sub 11, fluid is opened from the sub-packer zone into the inner tubing cavity and a depression is created on the formation. The fluid from the perforation zone through the filter 21, the check valve 20, the nozzle 13 enters the tubing. The selection of the diameter of the bore of the nozzle 13 sets the required rate of decrease in bottomhole pressure.

There is a cleaning of the bottom and bottom-hole formation zone from pollution products. After the termination of filling the tubing with fluid, the non-return valve closes, the tubing rises, the rubber cuffs 23 return to their previous position, and the fluid from the tubing is removed either by backwashing or by lifting the tubing with fluid. In this case, contaminated fluid does not enter the wellbore from the tubing.

When 21 depth gauges are installed in the tubing above the depression device and in the filter 21, information can be obtained to calculate well productivity and filtration parameters of the bottomhole formation zone.

This utility model can be used by the oil and gas industry in production, injection and absorption wells, regardless of the state of reservoir pressure.

Claims (1)

Depression device containing a mechanical packer and a filter located below it with support on the bottom, characterized in that it is equipped with a barrel on which an adjusting nut, a packer with sealing elements, inner and outer bushings are installed between the upper and lower thrust elements with the possibility of axial movement relative to each other when the pins are cut, by means of which the bushings are fixed in their initial position, and the upper sub, and a support is fixed at the end of the barrel coupling with a hollow tip, in which the fitting is installed and under it in the lower part of the upper sub covering the support sleeve, a sealing plug is installed with a shear pin installed under it, and a lower sub connected to the filter is fixed on the upper sub and a check valve is installed in it the latter being located below the sealing plug and a drop limiter for the sealing plug is installed above it when it leaves the upper sub.