SU947397A1 - Apparatus for applying depression to formation - Google Patents

Description

The invention relates to the technique of completing drilling of oil and gas wells, and specifically to devices for creating various types of depressions on the formation during well development.

A device is known for creating an instantaneous depression on a formation that contains a diaphragm installed in a tubing string, a packer and a circulation valve, which is bushing-shaped, blocked the radial channels in the Cll tubing.

A disadvantage of the known device is the low reliability of the operation of the overlap sleeve associated with its operation in a contaminated environment.

The closest to the proposed technical essence and the achieved result is a device for creating a depression on a formation, including a diaphragm installed in the pump-compressor pipes, a bag and a circulation valve.

The disadvantage of the known device. it is of low reliability when developing wells in conditions of great depths and contaminated wells. This is due to the fact that in a known device; it is necessary to create an overpressure to destroy the diaphragm.

in the annular space ground squeeze units. However, the presence of squeeze units and high tightness of the casing pipe is not always available.

The purpose of the invention is to create a depression on the reservoir in deep squiggles without the use of squeezing aggregates.

The goal is achieved by the fact that in the cavity of the pipes above the diaphragm there is an omnibus firing pin under the waste weight, and the circulation valve is placed in the packer.

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The drawing shows the proposed device.

The device for creating a deep depression on the reservoir includes a diaphragm 2 installed in the column 1 of pump-compressor pipes 20, a magnetized firing pin 3 above the diaphragm 2 under the throwing load 4, a packer 5 with sealing elements 6, a circulation valve 7 with a shut-off valve 8. Diaphragm 2 with a striker 3 is placed inside the non-magnetisable tube 9.

The device works as follows.

After the appropriate washing

Claims (2)

30 downhole, tubing string 1 is pushed down into the well with diaphragm 2, picker 3 and packer 5. After the casing shoe is brought to the required depth, the surface wellhead equipment is placed in the anti-flowing position and the waste weight 4 is lowered into the tubing string 1 free fall rate tends to slaughter. When a waste load approaches an magnetized striker 3, its speed under the action of magnetic forces is additionally made and makes an instant impact on the impact head 3. Under the action of the dynamic impact force, the diaphragm 2 collapses, the locking member 8 closes the circulation valve 7, the hydrostatic pressure of the fluid in the annulus presses the sealing elements 6 of the packer 5 against the borehole wall and completely packs the casing cavity from the annulus. A deep depression is created on the formation, the duration of which is completely This is determined by the amount of inflow of formation fluid into the well. As a result, a high pressure difference (reservoir and hydrostatic) is created between the reservoir and the well, which contributes to the rapid flow of reservoir fluids into the well. This significantly speeds up the well completion process and thereby reduces the cost of commissioning the well. The economic efficiency of the proposed invention stems from the simplification of the technical equipment and the technological development process of the wells, as well as increasing the reliability of putting the well into operation. Apparatus of the Invention A device for creating a depression on a formation, including a diaphragm installed in tubing pipes, a packer and a circulation valve, characterized in that, with the formation of a depression on a formation in deep wells without the use of a pressure block, in the cavity of the tubes above the diaphragm an magnetic is installed the firing pin under the drop weight, and the circulation valve is located in the packer. Sources of information taken into account in the examination 1. US patent and 3831680, cl. E 21 at 21/00, published. 1974. 2. USSR author's certificate number 281327, cl. E 21 B 45/00, 1968 (prototype).