ZFD type leaking stoppage system

Abstract

The invention discloses a ZFD type leaking stoppage system. According to the ZFD type leaking stoppage system, when well leaking occurs in the well drilling process, leaking stoppage can be conductedin time for many times under the condition without putting out of hole, well leaking complex accidents are dealt with, and the number of times of putting out of hole and running in hole can be effectively decreased. The ZFD type leaking stoppage system is more suitable for leaking stoppage in a well internally provided with various downhole instruments and downhole tools such as rotating guiding instruments, vertical guiding instruments, MWD instruments and screws, and the various downhole instruments can be effectively protected. Due to large and unblocked water holes of the ZFD type leakingstoppage system, the key sleeve type MWD instruments can be salvaged and put, and the advantages which other leaking stoppage tools do not have are achieved. A PBL leaking stoppage system is used generally currently, the effect is ideal, but the cost is high. Due to the fact that the ZFD type leaking stoppage system is provided with a basket pup joint, the key sleeve type MWD instruments cannot besalvaged and put. The ZFD type leaking stoppage system is easy to manufacture, high in practicability and less in investment. Bypass leaking stoppage is flexible and convenient, work reliability is high, the ZFD type leaking stoppage system can be widely applied to a petroleum well-drilling system, and comprehensive economic benefits of well drilling are increased.

Description

technical field [0001] The present invention is a ZFD type plugging system for petroleum drilling system. After lost circulation occurs in drilling, it can perform multiple plugging at any time without drilling. While plugging, it can effectively protect the downhole rotary steering, Various downhole instruments and tools, such as vertical guide, MWD, and screw rod, meet the requirements of salvage of MWD sit-key instruments after the occurrence of stuck pipe, salvage maintenance and release after instrument failure, ensuring the safe use of wireless MWD instruments and reducing tripping . Background technique [0002] Lost circulation is one of the most serious and complex situations that affect drilling safety. The occurrence of lost circulation will not only bring losses to drilling engineering, but also bring great difficulties to the exploration and development of oil and gas resources. Blowout, wellbore instability, reservoir damage, etc. are the problems caused by lo...

AI Technical Summary

Problems solved by technology

Its internal structure is complicated and there is no large and smooth water eye, and the number of throws is also limited by the capacity of the short section of the basket, so the price is expensive

Because the water eye of the drilling tool is the life channel of drilling, without a smooth water eye, it will bring a lot of inconvenience to the handling of downhole accidents. passage of tools, etc.

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