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- W2363129253 abstract "In order to solve the downhole problems of great change of equivalent mud density at annulus created by interrupting circulation for a connection such as making up or breaking out,the foreign companies have researched on continuous circulation drilling.Continuous circulation drilling refers to the wellbore is at the state of continuous circulation with no pumping off when joining and unloading single pipe among tripping in the process of drilling.This technology can make downhole pressure change stop caused by pumping on or off,and make complicated downhole problems and accidents less caused by the pressure change.It fits for pressure-sensitive wells,horizontal wells with long horizontal interval,extended reach wells,deepwater wells,unbalanced wells and wells with narrow density window.There are two types of continuous circulation drilling:continuous circulation system and continuous circulation subs.The former keeps the drilling mud circulating continuously and operates connections functions currently,provided by various drilling equipment,such as top drive connection tool,the coupler,the mud diverter manifold and control system.The later has later research,which consists of two-position three-way valve crossover and automatic coupling.Continuous circulation of drilling fluid may be realized through pre-connection of three-way valve crossover at the top of vertical column of the intervals need to continuous circulation,and fluid-in direction convert under the control of automatic coupling on by-path circulation pipeline and valve crossover.It has simple structure and easy operation,which has been widely applied to horizontal wells with long horizontal interval,extended reach wells,and high-temperature and high-pressure wells." @default.
- W2363129253 created "2016-06-24" @default.
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- W2363129253 date "2011-01-01" @default.
- W2363129253 modified "2023-09-23" @default.
- W2363129253 title "The Technology Facilities of Continuous Circulation Drilling and Their Application" @default.
- W2363129253 hasPublicationYear "2011" @default.
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