RU2255203C1 - Device for separating beds in a well - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: device has body, compacting element, lower and upper cones and sockets, stop with ring-shaped hollow, fixed on the body, and mechanism of plant with valve and filling apertures in form of hollow cylinder with plug, connected to body by cams, on upper portion of which ring with stepped piston is mounted, and on lower portion bushing with bottom is held on shear screws, having a shelf and holder for limiting its axial movement in the body. Stop has shelf, where a spring is placed, while spring is held in lower socket, ring-shaped hollow of stop has length, providing for interaction of it with lower cone in working position, and filling apertures are made in a bushing.

EFFECT: higher reliability, simplified construction, lower costs.

3 dwg

Description

The invention relates to the oil and gas industry and can be used in various technological operations for repair and insulation works in oil and gas wells.

A device for injecting insulating material, comprising a housing, a sealing element, anchor nodes, a shut-off valve and a sealing mechanism made in the form of a hollow rod with a piston and a seat for a receiving valve and a cylinder with an annular protrusion, and the rod below the saddle is made with radial channels [1 ].

This drillable device is not reliable in operation, as the shut-off valve is made in the form of a "cracker", the functions of which are performed by a spring-loaded shutter. Shut-off valves of this type do not have high reliability in ensuring the tightness of the device passage channel after the end of the sale of such insulating materials as cement mortars having solid fractions in their composition. These valves are designed to operate with a differential pressure only from the bottom up.

In addition, the anchor nodes of the device are made with clamps in the form of elastic split rings made of spring heat-treated steel, which is poorly drilled.

The closest in technical essence is a device for injection of insulating material, which consists of a housing with filling holes, a sealing element, lower and upper cones, lower and upper slips, an installation mechanism, including a composite housing with filling holes, the elements of which are connected by a sleeve, a pusher with shear screws, a latch located on the sleeve in the installation mechanism, an abutment with filling holes, a plug installed on shear screws in a composite housing lo, the cam sleeve with a bottom having an annular projection, and a clamp connected with the composite body via shear screws [2].

However, the known drillable device, as well as the above device in the source [1], does not have high reliability for the following reasons:

- the retainer located on the sleeve in the installation mechanism does not provide 100% response (rigid fixation without rolling back up) in wells filled with a liquid with a high sand content and various dirt;

- the design of the installation mechanism is such that at high pressures (above 15 MPa) of the injection of insulating material into the well, the buoyancy force Q ↑ acts on the installation mechanism, at which the installation mechanism disengages from the device and the filling holes are blocked until the end of the injection process of the insulating material into well;

- the design of the installation mechanism as a whole is very complex.

The technical result of the invention is to increase the reliability of the device by simplifying the design and reducing the cost of the device.

The required technical result is achieved in that the device for injecting insulating materials into the well comprises a housing, a sealing element, lower and upper cones and slips, an emphasis with an annular cavity mounted on the housing, and an installation mechanism with a valve and filling holes in the form of a hollow cylinder with a stopper connected to the housing by cams, on the upper part of which a shell with a stepped piston is installed, and on the lower part, a sleeve with a bottom having a protrusion and a latch is fixed on shear screws its axial movement in the housing, according to the invention, the abutment has a step where the spring is located, the spring being pressed into the lower slot, the annular cavity of the abutment has a length that allows it to interact with the lower cone in the working position, and the filling holes are made in the sleeve.

Figure 1 shows a device for pumping insulating material into the well in the initial position; figure 2 is the same, in the working position after installation in the production casing when injecting insulating material into the well; figure 3 is the same after disconnecting the installation mechanism from the device.

The device (Figs. 1-3) consists of a housing 1 with an annular groove "A", a sealing element 2, a lower 3 and an upper 4 cones, a lower 5 and an upper 6 slips, an abutment 7 with a step in which the spring 8 is placed, an installation mechanism with a valve in the form of a hollow cylinder 9 with radial holes "B", plug 10, shell 11, step piston 12, sleeve 13 with filling holes "B", with bottom 14, protrusion 15, retainer 16, as well as cams 17 and three rows shear screws 18, 19, 20.

The sealing of the contact surfaces between the parts of the device is provided by the rubber sealing rings shown in figures 1-3.

The device is connected to the casting column 21 using the sleeve 22 and lowered into the column 23 for injection of insulating materials into the well.

The device operates as follows.

After descent into the intended interval of the production casing 23, excess pressure is created in the device by injecting liquid through the filling column 21. The liquid through the holes "B" creates an axial load down on the stepped piston 12, under the action of which the screws 18 are cut off and the upper slot 6 anchors in the column 23 .

Next, the casting column 21 is pulled with a design force in excess of its weight, as a result of which the stop 7 with the spring 8, moving up with the housing 1 and the cylinder 9, seal the cuff 2 and anchor the lower slip 5 in the column 23.

Then, the excess pressure in the device is increased until the screws 19 are cut off, as a result of which the plug 10 moves into the sleeve 13 and the filling holes "B" are opened for injection of insulating material through the casting column 21 into the well (into the column 23 and annular space through the holes in the column 23, which are not shown in FIGS. 1-3).

In this case, the cams 17 have the ability to radially move from the tension of the cylinder 9 relative to the housing 1, i.e. the cams 17 do not provide for fixing them together.

The opening of the filling holes "B" is fixed by a decrease in pressure at the wellhead in the casting column 21.

After injection of the insulating material into the well, the casting column 21 is pulled with a design force in excess of its weight. When this sleeve 13 is moved up to the stop of the protrusion 15 at the end of the housing 1, the latch 16 is latched in the groove "A", and the screws 20 are cut.

As a result of this, the filling holes "B" are sealed off in the housing 1, and the installation mechanism is disconnected from the device for subsequent extraction with the filling column from the well.

It is most effective to use this device when disconnecting the underlying irrigated productive formations to transfer to overlying formations, as well as as a drillable bridge plug for separating formations in a production casing.

Sources of information

1. USSR author's certificate No. 691552, cl. E 21 B 33/12.

2. RF patent No. 2211302, cl. E 21 B 33/13.

Claims (1)

A device for separating the layers in the well, comprising a housing, a sealing element, lower and upper cones and slips, an abutment with an annular cavity mounted on the housing, and an installation mechanism with a valve and filling holes in the form of a hollow cylinder with a plug connected to the housing by cams, the upper part of which has a shell with a stepped piston interacting with the upper pin, and a sleeve with a bottom having a protrusion and a clamp to limit its axial movement in the housing is fixed on shear screws a whisker, characterized in that the emphasis has a step where the spring is located, the spring being pressed into the lower slot, the annular cavity of the emphasis has a length that allows it to interact with the lower cone in the working position, and the filling holes are made in the sleeve.

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