SU1716105A1 - Hydroabrasive perforator - Google Patents

Abstract

The invention relates to the mining industry and is intended for the perforation of oil and gas wells. The purpose of the invention is to increase the reliability of the punch by protecting the nozzle return holder (ND) from filling with abrasive. The perforator comprises a housing (K) with longitudinal and radial channels and an element for communication with the tubing string. In the radial channels placed nozzles with ND. The perforator is equipped with spring-loaded pistons and covers, and the LPs are installed in radial channels with the possibility of forming annular cavities filled with a viscous liquid. In K made longitudinal cylindrical channels. Pistons are displaced in cylindrical channels. The cavities on the opposite side of the piston spring are hydraulically connected to closed cavities and filled with a viscous fluid. Under the action of the pressure differential, the NDs are moved out of K and perforations are made at an optimum distance to the wall of the casing. Before lifting the perforator, the supply of working fluid is stopped, the pressure drop across the nozzles disappears and the LPs are pushed into K under the action of the pressure of a viscous fluid in the cavities. 3 il. s Ј

Description

VI Ј

eight

The invention relates to the mining industry and is intended to open up productive formations of oil and gas wells.

The purpose of the invention is to increase the reliability of the punch by protecting the nozzle return holder from filling with abrasive.

FIG. 1 shows the device in the transport position, axial section;

FIG. 2 is a section A-A in FIG. one; on fig.Z-device in the working position, a longitudinal section.

The hydroabrasive perforator comprises a housing 1 with a longitudinal 2 and a radial 3 channels and an element 4 for connecting the housing 1 to the tubing string. In the radial channels 3 are placed with the possibility of axial movement of the nozzle 5

with 6 mushroom shaped nozzle holders.

The puncher contains knots of return of nozzles holders. In the lower part of the housing 1, a saddle 7 is placed under the drop ball valve 8. The perforator is equipped with pistons 9, spring-loaded springs 10 and covers 11. The nozzle and 6 are mounted in radial channels 3 with the possibility of forming annular cavities 12 filled with viscous fluid. In the housing 1 parallel to its axis are longitudinal cylindrical channels 13.

Pistons 9 are placed in cylindrical channels 13c capable of moving and interacting with springs 10, and covers 1.1 are installed so as to shut off cylindrical channels 13 and interact with springs 10. In this case, cavities 14 with opposite spring 10 of piston 9 are hydraulically connected to annular cavities 12 and filled with a viscous liquid.

In addition, the housing 1 can be made with two oppositely directed and distributed along the length of the hull, in which the semi-hull 15 is rigidly fixed with the nozzle holders 6 and the spring-loaded pistons 9 installed in them.

Hydroabrasive punch works as follows.

When assembling, pressure is provided in cavity 14 by spring preload 9. This pressure holds nozzle holders 6 inside housing 1. The perforator is lowered with a device for moving it on pump tubing to the working depth. For work on tubing, the ball valve 8 is lowered and the working fluid is fed through them. This increases the pressure inside the perforator, which is significantly higher than the pressure in the well space. Under the action of this differential, the nozzle holders 6 are advanced and the perforations are advanced from the optimum

distance to the casing wall, which ensures perforation efficiency. In order to lift the perforator, the supply of working fluid is stopped, the pressure drop across the nozzles disappears, and under the action of pressure in the cavity 14, the nozzle holders are extended into the housing 1. This ensures that the perforator is freely lifted.

When performing the proposed perforator, the extension of the nozzle holders 6 occurs only when there is a differential pressure of the working fluid on the nozzles 5, and in its absence they automatically slide into the housing 1, which ensures the reliability of the device when it moves in the well.

Claims (1)

Invention Formula A hydroabrasive perforator comprising a body with longitudinal and radial channels and a member for connecting the body to the tubing string, nozzles with mushroom-shaped nozzle holders placed in radial channels with a possibility of movement, nozzle return assemblies and a saddle for a drop ball valve installed in the lower part of the body, it is distinguished, in that, in order to increase the reliability of the punch by protecting the return unit of the nozzle holder from filling with abrasive, it is equipped with spring-loaded pistons and lids, nozzle holders are installed in radial channels with the possibility of forming annular cavities, and cylindrical channels are made parallel to its axis in the housing, with This spring-loaded pistons are placed in the latter with the possibility of movement, the covers are installed with the possibility of blocking the cylindrical channels on the side of the spring of the piston, and the cavities with the opposite spring of the piston are side hydraulically communicated with the annular cavities and filled with viscous liquid. 7 (rig. 1 I / Ј 2. Fig.Z YU