SU1132001A1 - Formation opening-up apparatus - Google Patents

Abstract

A DEVICE FOR OPENING THE PLATE, containing a bush of hydraulic perforators consisting of a housing with nozzles, an overlapping sleeve, a reset valve, a restrictive sleeve, and an upper one. The bottom of the subs, characterized in that, in order to increase the perforation interval by making a bead from any number of perforators, the inner surface of the overlapping sleeve is made with an annular ledge and a restrictive sleeve is installed in its lower extended part, made of spring sectors connected to the lower sub with the possibility of radial movement, and the dumped valve is made in the form of a rod with o-ring seals and is equipped with spring-loaded latches, installed .s engageable with a shoulder overlapping the sleeve. §

Description

The invention relates to devices used in the oil and gas industry to open seams with a hydroabrasive stream of fluid.

A device for hydraulic perforation of wells is known, which contains successively connected perforators, including a housing, nozzles, the closure elements of which are made with an increasing margin of safety over the height of the perforators 1.

In these perforators, as the pressure rises, the bolt elements, which are diaphragms of various thicknesses, are successively destroyed. Experience with destructive diaphragms, especially those with small geometrical dimensions, shows their inadequate reliability.

In addition, for the operation of each subsequent perforator, it is necessary to increase the pressure differential by a significant amount compared with the working pressure differential in the perforator nozzles, which causes significant additional forces in the tubing string. Therefore, in deep wells the use of this type of perforator is not always possible.

Closest to the present invention is a device for opening the reservoir containing a bush of hydraulic perforators consisting of a housing with nozzles, a sleeve overlapping them, a dump valve, a restriction sleeve, upper and lower subs 2.

A disadvantage of the known perforator is that the number of perforators in the needle is limited, which narrows the information interval.

The purpose of the invention is to increase the perforation interval by making beads from any number of perforators.

This goal is achieved by the fact that, in a device for opening a formation containing a bush of hydraulic perforators consisting of a housing with nozzles, a sleeve overlapping them, a relief valve, a restriction sleeve, upper and lower subs, the overlapping sleeve has an annular ledge and the lower widened part has a restrictive sleeve, made of a composite, of spring-loaded sectors connected to the lower sub with the possibility of radial movement, and the discharged valve It is made in the form of a rod with o-ring seals and is provided with spring-loaded latches installed with the possibility of interaction with the step of the overlapping sleeve.

FIG. 1 shows a general arrangement of a perforator arm; in fig. 2 shows a single perforator without a valve in a position in which it descends into the SLE; azhine, longitudinal section; in fig. 3 - hydroperforator with hydroperforation, longitudinal section; in fig. 4 shows section A-A in FIG. 3; 5 in FIG. 5 is a diagram of the connection of the limiting bushing with the housing.

The device is lowered into the well on pipes and contains a bead of several perforators 1, the number of which is determined by the size of the perforation interval. Each of the single punchers consists of a housing containing an upper sub 2, a pipe 3 and a lower sub 4, and housings placed in the body 5. A step bushing 6 with an annular ledge 7,

5 by the cylindrical axial channel 8 and the expanded part 9 is held in the lower position relative to the body by the spring 10. In the expanded part 9 there is a restrictive sleeve 11, made in the form of sectors, between which springs 12 are placed. In sectors of the restrictive sleeve there are T-shaped cuts 13, which include T-shaped protrusions 14 of the lower sub 4. Resettable valve 15 is provided with spring-loaded latches 5 stone 16 and is installed in the cylindrical channel 8 of the overlapping sleeve 6.

The device works as follows.

After lowering it into the well in the position shown in FIG. 2, i.e. without the relief valve 15, the nozzles 5 of all the perforators are open, the shut-off sleeves of all the perforators are in the lowest position and are kept from spontaneous movement by the spring 10.

The 5 sectors of the restrictive bushing 11 are pressed to each other and their displacement in the radial direction under the action of the spring 12 is limited by the expanded part 9 of the overlapping sleeve 6. To perforate the valves, the valve is discharged into the pipes

15, which extends into the inside of the cylindrical channel 8, with its lower end resting on the limiting sleeve 11, the gap between the sectors of which is smaller than the outer diameter of the valve 15, and hermetically

5 isolates the nozzles 5 of the upper perforator from all other perforators. The hydroabrasive fluid injected into the pipes passes through the nozzles 5 of only one upper perforator and perforates the casing against these nozzles. After

In the case of perforations of these holes, injection into the pipes is stopped and pressure in the annular space of the well increases. Under the action of this, the valve 15 is moved upwards somewhat and its latch. 16

J picks up the overlapping sleeve 6 under the ledge 7, carries it along with itself and shrinks its extended part 9 with the restrictive sleeve 11, pushes the upper part of the closing sleeve 6 with seals

into the central channel of the upper sub 2, isolate the nozzle 5 of the upper perforator from the cavity. After the extended part 9 of the overlapping sleeve 6 slides off the sectors of the restrictive sleeve 11, its sector under the action of springs moves in the radial direction and the diameter of the restrictive sleeve becomes larger than the internal diameter of the expanded part 9 of the overlapping sleeve 6, which prevents the latter from spontaneously mixing way down.

Then reduce the pressure at the mouth in the annular space to atmospheric and again inject fluid into the cavity of the pipe. In this case, the valve 15 passes down through the widened gap between the sectors of the restrictive bushing 11 of the upper perforator and is located in the central channel 8 of the second one in the barrel of the perforator, isolating the nozzles of all lower-placed perforators. Due to the fact that the overlapping sleeve 6 insulated the nozzles of the upper perforator, the passage of fluid is provided only through the nozzles of the second perforator.

Then, in a similar manner, the repetition carries out a perforation of the entire interval, from top to bottom.

When using the proposed device, there is no need to carry out unnecessary pipe trips, the time spent on perforation is reduced, and it becomes possible to increase the depth of hydroperforation of wells.

lit .13

FIG. five

Claims (1)

DEVICE FOR OPENING LAYER, containing a garland of hydroperforators, consisting of a body with nozzles, overlapping their bushings, a reset valve, restrictive bush, upper and. lower sub, characterized in that, in order to increase the perforation interval by garland of any number of perforators, the inner surface of the overlapping sleeve is made with an annular ledge and in its lower expanded part there is a restrictive sleeve made of a spring-loaded sectors connected to the lower sub with the possibility of radial movement, and the resettable valve is made in the form of a rod with O-rings and is equipped with spring-loaded latches installed with possibility of interaction with a shoulder overlapping the sleeve. Fig /