RU96172U1 - DEVICE FOR PERFORATION OF WELLS AND RIP - Google Patents

Abstract

 A device for well punching and fracturing, consisting of serially connected and hydraulically connected working chambers and horizontal cylinders with punches placed in them, while a unit for creating pressure is placed above the working chamber, separated from the working chamber by a separation piston, characterized in that in the punches through channels are made in communication with the working chamber, and the separation piston is provided with a valve configured to open at the end of the stroke.

Description

The utility model relates to the oil and gas industry, in particular, to devices for perforating wells with subsequent fracturing of the reservoir.

A device for perforating wells with an ASG-105 case pressure generator connected to it is known, in which the powder charge is placed in a steel case, which is a combustion chamber. The outflow of powder gases occurs in the interior of the well through conical nozzles located in the housing. At the moment before the formation rupture, holes are drilled through the casing using a perforator, connecting the formation with the inside of the casing (Thermogasochemical effect on low-production and complicated wells. G.A. Chazov, V.I. Azamatov, S.V. Yakimov, A. I. Savich. - M .: Nedra, 1986, - 150 p.).

The disadvantages of this device include:

1. Impact on the well support;

2. Low efficiency of formation fracturing by powder gases - the pressure in them when moving through perforations into the formation drops sharply, unlike a liquid, and most of the explosion energy is lost in the interior of the well;

3. With repeated use, not only new cracks will be created, but also already formed ones will be reopened.

A device for perforating wells is known, consisting of a housing in which a node for creating pressure, a working chamber, horizontal cylinders with punches placed in them, each of which has a cutting and piston parts, are connected in series and hydraulically connected. The pressure generating unit is separated from the working chamber by a separation piston (SU 1446974, 1986).

The disadvantage of this device is the small depth of penetration into the reservoir, determined by the stroke of the punch in the horizontal cylinder, which in some cases is not enough to create a reliable hydrodynamic connection between the reservoir and the well.

The utility model is aimed at shockless perforation and increase the efficiency of subsequent fracturing.

This object is achieved in that the device for well punching and fracturing consists of serially connected and hydraulically coupled working chambers and horizontal cylinders with punches placed in them, while a unit for creating pressure is placed above the working chamber, separated from the working chamber by a dividing piston. New in the device is that in the punched holes there are made through channels communicated with the working chamber, and the separation piston is equipped with a valve made with the possibility of opening at the end of the working stroke.

The inventive design of the device allows shockless perforation of the well and increase the efficiency of subsequent fracturing due to the maximum possible use of energy, for example, powder gases after the initial fracturing of the fluid with a liquid under the separation piston, to fracture the productive reservoir repeatedly, sequentially reinstalling the device over its entire interval.

The drawing shows a General view of the proposed device.

The device comprises a unit 1 for creating pressure with a powder charge 2 located therein and a separation piston 3 with a valve 4. The working chamber 5 is rigidly connected and hydraulically connected to horizontal cylinders 6, in which punches 7 having through channels 8 are installed.

The device operates as follows.

After the device is lowered to the sole of the reservoir, the powder charge 2 in unit 1 is ignited. Under the action of the powder gases, the separation piston 3 with valve 4 is set in motion and creates excess liquid pressure in the horizontal cylinders 6 hydraulically connected to the working chamber 5. Under the influence of excess pressure, the punches 7 with channels 8 exit the horizontal cylinders 6 and shock-cut holes in the casing. The liquid from the working chamber 5 passes under excess pressure through the channels 8 in the punches 7, penetrates into the reservoir and breaks it, forming a crack. At the end of the stroke of the piston 3, the valve 4, interacting with its end face with a partition separating the working chamber 5 and the horizontal cylinders 6, opens, and through the hydraulic part of the horizontal cylinders 6 and the through channels 8 in the punches 7, the powder gases penetrate into the crack and increase it . After triggering, the punches 7 return to their original position, for example, by lifting the device and interacting with the walls of the well at an angle made to the surface.

The device is recharged and installed above the created crack to the calculated height, or rotated to a predetermined angle at the initial depth and the process is repeated.

Claims (1)

A device for well punching and fracturing, consisting of serially connected and hydraulically connected working chambers and horizontal cylinders with punches placed in them, while a unit for creating pressure is placed above the working chamber, separated from the working chamber by a separation piston, characterized in that in the punches through channels are made in communication with the working chamber, and the separation piston is provided with a valve configured to open at the end of the stroke.