SU1227805A1 - Apparatus for feeding depression to formation - Google Patents

Description

The invention relates to equipment used in the petroleum industry to create a depression on a formation during the purification of a bottomhole formation treatment of oil and injection wells.

The aim of the invention is to improve the reliability of the device by eliminating abrasive wear of check valves in the case of multiple formation of a depression on a formation in a string of pipes.

The drawing shows schematically a device for creating a depression in a formation.

The device consists of a housing 1 with upper and lower rows of windows 2, non-return valves 3 installed in the lower row of windows, and a packer 4. A plunger is installed inside the housing, made in the form of a differential hollow piston 5 with windows 6 located in the upper part the plunger, valve seat 7 and valve 8. The piston cavity communicates with the subpacker zone through the lower open end of the housing 1, and the piston cavity communicates with the subpacker zone through additional windows 9. The device is assembled into the well 10 Olona tubing

ten

20

Pusa 1, the valve 13 is open. After the level decreases by a predetermined value, pressure is relieved in the tubing string. When the pressure drops in the tubing assembly 11, the differential piston 5 returns to its original position, overlapping window 2. The return of the differential piston 5 to the initial position occurs automatically due to the action of the reservoir pressure in the sub-packer zone on the piston 5.

The formation fluid, together with the suspended particles, rushes from the sub-pakchernoy zone into the column of nasosp-compressor tubes 1. Thereafter, the processing cycles are repeated until significant amounts of suspended matter are carried out to the surface of the liquid. In each subsequent reduction cycle, the liquid taken from the reservoir with the suspension is removed from the tubing string 1 through the windows 2 of the device body, and the check valves 3 are mined, thereby increasing the reliability of the device.

In the process of creating pressure in the tubing string 11, when the liquid level decreases, the treated formation is cut off by valve 8, thereby eliminating injection into the formation

(Tubing) 11 and is packaged in a casing 25 suspended in the previous cycle,

lonne well. The wellhead is equipped with stationary flow or wellhead equipment for injection wells.

The device works as follows.

Through valve 2 on the tubing string

the remaining tubing in the column 11. This achieves a more efficient cleaning of the reservoir and a reduction in the required number of treatment cycles.

At the end of the well treatment, a decrease in the level of the liquid is made, the backwash is circulated by the circulation with a compressor or a gas-liquid mixture, semi-liquid but through the annulus

valve 13, valves 3, ports 6, valve 8, tubing string AND and valve 12. Ball valve 8 is flushed to the surface. During the flushing of the well

readable in a surface mixer with a compressor and pump unit. Under the action of the pressure of the gas or gas-liquid mixture, the valve 8 is closed and

the differential piston 5 starts the rotary valves 3 operate on clean

place down. In this case, the windows 2 in the housing 1 open and the liquid flows from the tubing 11 to the annulus, and the windows 6 of the differential piston 5 are separated from the valves 3 of the fluid and are not subjected to abrasive wear. After treatment of the well, its development is performed by aeration of the fluid in the tubing string 1 1 through the annulus and valves 3.

Editor L. Povhan Order 2000/34

VNIIPI USSR State Committee

for inventions and discoveries

1 13035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

0

0

Pusa 1, the valve 13 is open. After the level decreases by a predetermined value, pressure is relieved in the tubing string. When the pressure drops in the tubing assembly 11, the differential piston 5 returns to its original position, overlapping window 2. The return of the differential piston 5 to the initial position occurs automatically due to the action of the reservoir pressure in the sub-packer zone on the piston 5.

The formation fluid, together with the suspended particles, rushes from the sub-pakchernoy zone into the column of nasosp-compressor tubes 1. Thereafter, the processing cycles are repeated until significant amounts of suspended matter are carried out to the surface of the liquid. In each subsequent reduction cycle, the liquid taken from the reservoir with the suspension is removed from the tubing string 1 through the windows 2 of the device body, and the check valves 3 are mined, thereby increasing the reliability of the device.

In the process of creating pressure in the tubing string 11, when the liquid level decreases, the treated formation is cut off by valve 8, thereby eliminating injection into the formation

recovered in the previous suspension cycle,

liquids and do not undergo intense abrasive wear. After treatment of the well, its development is performed by aeration of the fluid in the tubing string 1 1 through the annulus and valves 3.

Compiled by I. Cap

Tehred I. Vereo Corrector V. Butt ha

Circulation 548 Subscription

Claims (1)

DEVICE FOR CREATING DEPRESSION ON THE PLASTIC, comprising a packer, a housing connected to the pipe string with upper and lower rows of windows, check valves installed in the lower row of windows, an axially movable hollow plunger with radial channels and a saddle in the upper part under the throttle valve characterized in that, in order to increase the reliability of the device by eliminating the abrasive wear of the check valves when repeatedly creating depression in the pipe string to the formation, the specified plunger is made in the form of different a potential piston, which forms a supra- and subpiston cavity with a body, communicating with the under-packer space of the well. to? • m ABOUT Joint venture