SU143756A1 - Apparatus for preventing overflow of fluid through pipes - Google Patents

Description

The known devices for preventing the overflow of fluid from wells consist of a rolling along the axis of the valve and a cylinder with compaction.

The described device differs from the known ones in that its cylinder is connected to two subs, forming the device body, and the valve has a valve in the upper part and a window in the lower part and a sleeve to which the shank is attached. The distance from the spool coupling to its windows is such that in the upper position of the spool the windows are above the cylinder, and in the lower position they are below it. Such an embodiment of the device provides the ability to lift pipes without pre-killing the well, and also allows to protect the underground repair team from the water that is poured from the pipes during their lifting.

The drawing shows the described device for preventing liquid overflow through the pipes in a longitudinal section.

The device consists of a cylinder / and a spool 2 with a shank moving in it. The spool is made in the form of a hollow tube with transverse through holes 3 and can move up and down in the cylinder under the action of the shank, with which it is connected by means of the coupling 4 and the nozzle 5. The coupling also serves as a travel stop and accepts all axial loads, unloading spool.

As the clutch moves upwards, the clutch rests on the lower end of the cylinder /, while the clutch 6 goes downward on the collar 6. A safety check valve 7 is screwed into the upper part of the spool, allowing only liquid to flow down. A guide pin 8 is screwed into the coupling 4, which fits into the slots of the casing 6 and prevents the spool from turning relative to the cylinder 1. The sub 9 connects the cylinder / s to the squalshine descent column

No. 143756- 2 -

rude It is provided with a gasket 10 which seals and prevents Pbsk from falling into the gap between the cylinder and the valve.

During the descent into the stack column pipes with a locking device at the end of the spool, the action of the weight of the shank occupies the bottom: the floor of the valve is located under the cylinder. In this position, the cylinder is completely blocked, the valve 7 prevents the liquid from flowing through the central column of pipes and it flows from the locking device through the holes of the valve into the annulus. Upon reaching the bottom or landing of the column on the packer, the spool stops, and the cylinder with the column pipe continues to move until it stops at the sleeve 4. In this position, the spool bores are located above the cylinder and the locking device opens. During the lifting of the pipe string, the spool is lowered by the weight of the shank and the locking device closes.

Thus, new in the described device is the use of check and slide valves, which allow to eliminate the overflow of fluid during the descent and lifting operations. The device passed industrial tests that confirmed its operation.

Subject invention

Claims (2)

1. A device for preventing the overflow of fluid through the pipes during an underground repair, consisting of a cylinder with a seal and moving along the axis of the slide, characterized in that. in order to allow pipes to be lifted without first killing the well, its cylinder is connected to two subs, forming the device body, and the valve has a valve in the upper part and a window in the lower part and a sleeve to which the shank is attached. 2. A device according to claim 1, characterized in that the distance from the spool coupling to its windows is such that in the upper position of the spool the windows are above the cylinder, and in the lower position they are below it.