SU107025A1 - Internal release cap with hydraulic lock - Google Patents

Description

This invention relates to an emergency release-type reprocessing tool for catching and retrieving drill pipes from a well. Constructions of releasing tubings are known, in which, to be able to release them from catchable pipes, the dies are fixed in the inoperative position by means of devices equipped with flat springs in contact with the inner surface of the casing (lamp type) in the well. When using such a retainer, it is necessary to rotate the column of lifting pipes with the trumpet.

The described fidget lacks this drawback, which simplifies the process of catching pipes, since it uses a spring-loaded piston with bevelled side planes, providing, under pressure from the washing liquid, displacement in the transverse direction of the spring-loaded pins, entrance P1, with their ends into the annular

deepening of the housing associated with dies held in a non-working position.

The drawing depicts an exemplary release with a die with dies in the non-closed position.

The main part of the trap is the rod 1, which is a rotational body with a through central channel for the passage of fluid and two beveled planes and longitudinal projections on them like a dovetail for moving the dies 2. The moving of the dies is limited by the die holder 5 with two windows under the dies. The rod is connected to a cylinder 4, in which a limiting bolt 5 and a hydraulic locking mechanism consisting of a spring-loaded piston -bubber 7 compacted with rings 6 are placed with two lateral oblique planes with which two spring-loaded pins 8 come into contact. Casing 9 with an annular recess 10 is connected via clutch 11 with a die holder.

In order to catch and remove the drill pipes, a die is pushed down into the well and screwed onto the lower end of the riser string, and the flushing fluid is pumped into this string to flush the plug. Under pressure from the fluid, the piston is lowered, causing the fixing pins 8 to move apart from moving its flattened planes, and the ends of the pins enter the cage's annular recess qeinie, holding the latter and, together with it, the flat holder with the caps in the non-working (closed) position, as shown “In the drawing. After the cessation of fluid pumping, the porsche 1b is lifted under the action of a spring, and at the same time the springs coming closer from the annular recess of the casing come together by the springs. When lifting pipes with a small piece of cloth, the released casing with a plaster holder and raincoats are shifted relative to the rod and the cylinder, the cloaks are moved apart along the flat planes of the rod and seize the pipe to be caught. With a further rise of the trumpet, there is a rise of the pipe being caught or the pipe string,

if it is impossible to remove the pipe being caught, the die is lowered, as a result of which the cloaks and casing are moved upwards. When pumping fluid, the sprit is lowered, and at the same time the pins are moved apart before they are introduced into the annular recess of the casing, and thus the dies are kept in an inoperative position, as a result of which the die can be removed from the well or re-seized the pipe being caught and an attempt to extract it from the well.

Subject and 3 o and e and

Internal release from the die with a hydraulic lock acting under pressure of the flushing fluid, so that, in order to remove the die from the catchable pipe string without turning it, it is possible to use a spring-loaded piston with bevelled side planes. ; relocate; e in the transverse direction of the spring-loaded clips, which, at their ends, enter the annular recess of the casing associated with the sleeves held in an inoperative position.