An infinite loop short

Abstract

An infinite circulation pup joint of the present invention belongs to the technical field of petroleum operation equipment, and includes a casing, the side wall of the casing is threadedly connected with a bypass nozzle, a mandrel is placed in the inner cavity of the casing, and the front end of the mandrel is placed Inside the mandrel of the reversing piston, on the mandrel at the end of the mandrel of the reversing piston, the reversing intermediate mandrel, spring, spring sleeve retaining ring and lock nut are sequentially set, and the tail of the mandrel is set with a balance piston and a connecting ring. A central water nozzle is installed on the straight mouth of the inner hole of the piston core rod. The infinite circulation pup joint of the present invention has reasonable structural design, convenient use and operation, effectively solves the problem of lost circulation in the drilling process, has high working efficiency, saves manpower, financial resources and time, and avoids serious lost circulation caused by Accidents of well wall collapse, stuck pipe and blowout. Lost circulation is found without tripping, and can be dealt with immediately to avoid gradual expansion of lost circulation. It can carry out unlimited plugging operations while drilling, effectively protects BHA drilling tool assembly and downhole instruments, and does not affect normal operations.

Description

technical field [0001] The invention belongs to the technical field of petroleum operation equipment, and in particular relates to an infinite loop short joint. Background technique [0002] With the development of oil and gas exploration and development, the number of deep wells, complex wells and special process wells is increasing year by year, and the problem of lost circulation is a very difficult problem in the drilling process, which often wastes a lot of manpower, financial resources and time, causing serious lost circulation. It will cause well wall collapse, sticking and blowout accidents, and even make a well scrapped, resulting in huge economic losses. Although people have proposed and applied many lost circulation technologies and methods, the problem of drilling lost circulation has not been effectively solved so far. The main reason is that the lost circulation has not been dealt with in time, so that the lost circulation has become more serious and even out ...

AI Technical Summary

Problems solved by technology

With the development of drilling technology, downhole power tools and measurement-while-drilling instruments are widely used. The passage of plugging materials will cause the failure of these downhole tools or instruments. Therefore, it is necessary to trip out of the hole and replace the plugging BHA if the leakage is found, which not only reduces the operation efficiency , increase the operating cost, and also make the lost circulation fail to be dealt with immediately, and the lost circulation gradually expands, which seriously affects the stability of the well wall and the safety of well control

The traditional plugging joint can only switch and bypass once or several times, and the operation effect cannot be effectively improved

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