SU581236A1 - Device for running in and cementing liners - Google Patents

Description

one

The invention relates to equipment for casing boreholes.

Devices are known for launching and cementing liners during casing of bore holes l.

The closest to the proposed invention in its technical essence and the achieved result is a device for lowering and cementing shanks, including a sub, a plug connected to the left with a housing, a rod with a piston, a spline connection and a cavity formed by the piston and the plug 2.

However, the spline connection of this device is not sufficiently reliable in operation, which leads to a violation of the technological process of the casing.

The purpose of the invention is to increase the reliability of the spline joint.

This is achieved by the fact that the stopper in the proposed device is placed with a honey sub and a piston and is filled with a channel in which a check valve is placed, with one part of the spline joint placed on the upper end of the stopper, and the other on the lower end of the sub

2

The drawing shows the proposed; my device, a general view.

It has a sub 1 for connection with drill pipes, having splines 2 at the bottom end of a spline connection, a rod with a piston 3 and with bushing 4 blocking the flushing windows 5. In case 6, a plug 7 is fixed on the left thread, the spline 8 of which has splines compounds. The housing 6, the stopper 7 and the piston 3 form an airtight cavity 9 filled with a liquid, for example oil. In the threaded plug 7 is made bypass channel 10 with a check valve 11.

The rod with the piston 3 is connected to the housing 6 by a ball SciMKOM 12, which is locked by a hollow separator plug 13 mounted on the shear elements 14. The housing b at the bottom is connected to the casing 15.

The balls of the lock 12 are made of easily-drilled material and their strength must be such that, if necessary, you can turn the shank, and in the case of non-cutting elements 14 - cut the balls 12 with the weight of drill pipes.

The device works as follows 6m.

In the process of lowering the shank or section of the casing column, if necessary, it is turned. This is ensured by the presence of a ball lock 12.

After lowering the shank and pumping the cement mortar into the drill hole, the pipes are inserted into an elastic separator plug and pushed with a gfdmuvochnaya fluid. When the elastic plug is seated on the hollow separator plug 13, its internal channel is blocked. The pressure force of the flushing fluid cuts off the elements 14 and moves the plug 13 down the casing. At this time, lock 12 is released, and from this moment only drill bits can be rotated.

After landing the plugs on the stop ring in the drill pipe, throw a ball or throw the plug. When the ball is seated on the sleeve 4, its inner channel closes. The pressure force of the flushing fluid cuts off the elements 16, securing the sleeve 4, which moves downward and opens the washing windows 5. After that, the excess cement solution is washed off directly or backwash.

In order to disconnect the device from the casing, the drill pipes and the piston 3 are lowered, a vacuum is created in the cavity 9, the valve 11 is opened, and flushing fluid flows from the well into the cavity 9. After lowering the stepped stem 3 to the extreme position

the splines 2 of the sub 1 are meshed with the splines 8 of the plug 7. The fluid in cavity 9 prevents the splines 2 and 8 from disengaging. When the drill string is correctly rotated, the left plug 7 is unscrewed from the funnel b and can be removed to the surface together with the piston 3 when lifting drill pipes.

The proposed device increases

the reliability of the spline connection accelerates the grouting process and ensures trouble-free operation.

Claims (2)

1. Levin E.M. and others. The descent and suspension shank when attaching skvyasin, Grozny, 1970, p.66-67. 2. USSR author's certificate In 300587, cl. Е 21 В 19/00, 01.24.69.