SU126441A1 - Device for lowering and cementing the casing - Google Patents

Description

The known devices for lowering and cementing the casing casing strings require the use of drill pipes, which are connected to the column by means of a sub, which makes it impossible to leave the cement in the column at the required depth.

The proposed device does not have this drawback, since the detachment of the piping into the well from the pipes without rotating them is made using a threaded connection.

FIG. 1 shows a structural diagram of the proposed device in section; in fig. 2-cork stopper.

The device includes a nipple /, an outer sleeve 2 and an inner sleeve 3, the upper end of which is connected to the compressor-compressor pipes 4, and the lower end is connected to the socket 5, at the end of which there is a removable floor tube 6. Inside the sleeve 3 is fixed the sleeve 7, locking rusks 8, on which the descent column is held. The tightness of the gap between the outer and inner couplings is provided by rubber rings 9.

The column is lowered onto the pump-compression pipes to the required depth, and then the well is washed and the column is cemented. After cement is pumped into the pipes, a rubberized plug 10 is inserted, which is pressed to the stop ring at the bottom of the column. When the stopper moves, the latter, entering the internal sleeve 3, moves the sleeve 7 out of step, into the hollow plug 6. After the sleeve 7 is moved downward, the internal sleeve moves downward, resulting in craps coming out of the hole of the sleeve 2, thus separating the column from the pipes. The stopper 10, having closed with a hollow stopper 6, moves viz.

The movement of the nrobok in the column will ensure the extrusion of the cement mortar to the stop ring. When both plugs land on the thrust ring, there is a sharp increase in pressure at the pump, which

№ 126441

points to the end of the cement slurry. Then the tubing is lowered by 1.5 m, which is why the crackers emerge from the coupling groove and in this state do not prevent the tubing from lifting.

Such a disconnection of the tubing from the string allows it to remain in the well.

After the lock is released from the coupling, excess cement is washed out, one above the upper end of the column and left inside the branch pipe.,

Subject invention

Claims (4)

1. A device for launching and cementing casing casing strings, ensuring free separation of the casing pipe from the casing and displacement of cementing to a predetermined depth. , consisting of smooth, outer and inner, couplings and several crackers, radially set into the inner sleeve, the ends of which enter the annular groove of the outer sleeve, and held in such a polo enii fixed locking sleeve. 2. The device according to claim 1, characterized in that the groove in the outer sleeve and the ends of the crackers included in it are made with a one-sided bevel so that when the closure sleeve is displaced and the inner sleeve is moved downwards, the crackers go out of the groove, and Disconnection of the column is achieved. 3. The device according to paragraphs. 1 and 2, characterized in that a separator plug, made of two parts, solid and hollow, which are included in the process of pushing the mortar into one another and forming one detachable plug, by means of which the cement mortar is squeezed out of the casing string, is used to push the cement slurry . 4. The device according to claim 3, characterized in that the flat part of the separation plug is discharged through the drill pipe string and, when it moves along the column, it displaces the locking sleeve that holds the threadless connection nuts.