SU581238A1 - Device for catching insertion tool - Google Patents

Description

one

The invention relates to a drilling technique, namely, devices for gripping a tool insert.

Devices for gripping the tool insert are known, including a nozzle with drain holes, which during drilling are covered with a cuff attached to the rod that is removed when the tool is lifted. In this case, the insertion tool grip is performed by an overshot 1, descended on the rope.

The disadvantage of these devices is that in the event of a rope break. it takes a lot of time to extract it from the pipe string, especially if the breakage occurred close to the wellhead.

The closest in technical essence and the achieved result is a device for gripping the tool insert, including a copus / located between the drive pipe and the drill string, which is made with drain radial holes, a hollow piston rod with a piston installed inside it, and an overshot 12.

The disadvantage of this device is that when untimely shutdown of the drilling pumps, opening

gate valves on the injection line or preventer, lifting tools at high speed represents an increased danger to members of the drilling crew.

The purpose of the invention is to increase the safety of work when lifting the plug-in tool by reverse circulation.

This is achieved in that the overshot is rigidly connected to the piston, and the piston is provided with a check valve.

FIG. 1 illustrates the proposed device while drilling a well with an insert tool; figure 2 - the same, during the lifting tool insert.

The device for lifting the insertion tool has a housing 1 which, when drilled, is installed between the drill pipes 2 and the sub 3 connected to the lead pipe 4. In the lower part of the case 1 there are drain holes 5, and in the upper part there are choke holes 6. Inside the case 1 a hollow rod 7, a piston 8 rigidly connected to it, an overshot 9 and a valve 10.

The device works as follows. During drilling

fluid from the lead pipe 4 through the hollow rod 7 enters the drill pipe 2, opening the valve 10. The piston 8 isolates the high pressure cavity inside the pipe 2 and prevents leakage. the solution through the drain holes 5.

To lift the insert tool back to the flushing fluid, the lead pipe 4 is disconnected, the preventer 11 is closed and the string of pipes is mounted on the rotor 13 with elevator 12. The flushing fluid is supplied to the sealed annulus through the discharge port 14. The rising liquid inside the tube conveys the insert tool 15 to the wellhead.

Under the pressure of the flushing fluid, the piston 8 is raised and installed above the drain holes 5, through which the liquid enters the chute system 16. The internal cavity of the rod 7 closes with the valve 10. The piston 8, having the drain holes 5, forms together with the housing 1 , a sub 3 and a rod 7, a chamber 17 connected to the annular space by choke openings 6. Lifting inside the drill pipes 2, the insertion tool 15 hits the overshot 9 and moves upwards together with the rod 7 and the piston 8. When moving, the rod 7 acts on the switch 18, by means of which the drilling pumps are turned off or the valves that discharge the flushing fluid on the discharge line are opened. The further movement of the insertion tool occurs by inertia with a decrease in its speed until complete braking due to the outflow of the washing liquid in the chamber 17 through the choking holes b.

In order to see the impact, during the return stroke of the piston 8 there is a spring 19.

Claims (2)

1. USSR author's certificate No. 100111, cl. E 21 B 21/00, 1953. 2. Drilling Engineer's Handbook, M., Nedra, 1973, Volume 2, pp. 19898. 1rzg f 18 phage.2