RU1803537C - Squeeze cementing tool for placing cement bridging plugs - Google Patents

Abstract

Use: to isolate productive horizons from each other when testing exploratory and production wells. SUMMARY OF THE INVENTION: An upper air chamber with a hollow finger, a piston with a pusher, and a destructive element, which is placed above the well with a cement slurry and an elastic stopper in the lower part, is made in a tamping gun. An axial cylindrical socket is made in the connecting head, in which a destructive element is installed in the form of an explosive assembly. Below the piston-separator in the initial position in the choke an additional hole is made. A metal brush is mounted on the bottom plunger so that it can expand to contact the inner diameter of the casing. When the elastic plug is extruded, cement slurry is poured onto it, while the metal brush moving up with the lower pusher cleans the inner surface of the column, which improves the adhesion of the cement material to the column and improves the quality of installation of bridges. 1 s.p. f-ly, 3 ill. ate with

Description

The invention relates to the oil and gas industry and can be used to install dividing bridges to isolate productive horizons from each other when testing exploratory wells.

The aim of the invention is to increase reliability while simplifying the design.

In FIG. 1 shows a diagram of a cement slab assembled to be lowered into a well; FIG. 2 shows the moment of operation of the cement slurry; in FIG. 3 the installation of a cement bridge and the lifting of the projectile.

The cementing tool d (see Fig. 2) consists of a logging cable 1, a sealant 2, an connecting head 3, an axial cylindrical chamber 4, a chamber upper 5, in which a hollow pin 6. is placed, the piston 7 with the pusher top 8, the baffle top 9, in which the upper pusher is sealed, the holes of the upper 10, the piston-separator 11, the holes of the lower 12, the flexible element 13, the pusher of the lower 14, the septum of the lower 15, in which the seal 00

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there is a pusher of the bottom, a metal brush 16, a burst connection 17 (pin), a bolt 18, an elastic plug 19, a baffle 20 filled with grouting material, a lower hole 21, a grouting material 22, an explosive assembly in the form of an explosive 23.

The axial cylindrical socket 4 in the connecting head 3 serves to accommodate the explosive assembly (explosive cartridge) 23, a hollow pin b for connecting the upper chamber to the borehole fluid after its destruction, the upper hole 10, 12, 21 to balance the pressure in the chute, flexible element 13 for connecting a piston-separator with a pusher 14, a baffle upper 9 and a bottom 15 for sealing with a pusher 8 and 14, a metal brush 16 is designed to clean the inner walls of the casing from clay cake, a burst connection is intended to connect the bolt 18 to the pusher 14. An elastic plug serves to form the bottom of the bridge in the casing.

The cement slurry d works as follows,

It is lowered to a given installation depth of the bridge in the form shown in FIG. 1, and then the current 1 is supplied via cable 1 to the explosive angle 23. The explosive assembly operates and the explosive wave destroys the hollow finger. As a result, the borehole fluid under high pressure enters through the channel of the finger of the hollow 6 into the chamber 5 and moves the upper piston 7 down, since the pressure in the chamber under the piston is atmospheric. As a result, the upper pusher transfers force to the piston-separator 11, which in turn acts on the cement slurry 22. Due to the pressure pusher 20 developing in the chute 20, the lower pusher 14 pushes the elastic plug into the casing, as shown in FIG. 2, creating an artificial face for the installation of a bridge.

After that, with the help of cable 1, the cement shell is lifted up, and the elastic plug 19 in the column remains stationary. Since the elastic plug 19 is connected with a discontinuous connection (pin) to the lower pusher 14, and it, in turn, is connected by a flexible element 13 with the piston-separator 11, then there is a forced emptying of the baffle 20 from the cement slurry 22, which forms a cement dividing bridge (see Fig. 3).

With further lifting of the projectile, when the piston-separator sits on the baffle 15, the shear joint 17 is destroyed

and the projectile with the piston-separator 11, the flexible member 13, the pusher bottom 14 and the metal brush 16 rises to the surface for secondary use. As the metal brush 16 passes through the grout column, the latter cleans the casing wall of the mud film, whereby the grouting material comes into direct contact with the casing metal, which improves the quality of the installed bridge.

The brushing of the inner walls of the casing is caused by the fact that the brush has a diameter larger than the inner diameter of the casing. The rate of release of the bobbin from the grouting material depends on the lifting speed of the grouting shell and does not depend on the density of the drilling and grouting materials.

The use of the present invention will significantly simplify its design, increase the reliability of its operation, reduce the cost of its manufacture, and the use of a cleaning metal brush in the design of the shell will improve the quality of the installed bridges.

The economic effect is formed by reducing the cost of manufacturing the projectile, the reliability of its operation and improving the quality of the installed bridges.

Claims (2)

1. A cementing tool for installing dividing bridges in wells, consisting of a connecting head, a housing, an upper air chamber with a hollow finger and a destructive element placed vertically to the axis of the hollow finger, and a piston with an upper pusher, a choke with grouting material and a piston a separator with a flexible element associated with the lower pusher, the upper and lower partitions with an axial hole for the pushers placed in the bobbin, an elastic stopper made with a side hole under the lower and upper partition installed under the lower baffle and connected by a discontinuous element with a lower pusher, characterized in that, in order to increase reliability in operation while simplifying the design, it is equipped with a metal brush mounted on the lower pusher, which is expandable to contact with the inner diameter of the casing columns, while in the connecting head an axial cylindrical socket is made, the destructive element is made in the form of an explosive assembly and is installed in the latter, and An additional hole is filled under the separator piston in its original position. 2. A plugging apparatus according to claim 1, characterized in that the explosive element is made in the form of an explosive cartridge.