The invention discloses a double-layer continuous pipe double-gradient drilling system. On the basis of conventional drilling equipment, the double-layer continuous pipe double-gradient drilling system includes a double-layer continuous pipe system, isolation fluid, a downhole lifting pump system, a throttle control system and a data monitoring system; power fluid is injected by a drilling pump package, passes through a conversion joint and enters a double-layer pipe annulus, passes through a downhole lifting pump, enters a double-layer continuous pipe inner pipe through a bridge type channel,and then passes through a power drill tool and a drill bit and enters a bottom hole; and return fluid passes through a recovery hole and enters an annulus channel of a double-layer continuous pipe, then enters the double-layer continuous pipe inner pipe through the bridge type channel and enters the downhole lifting pump, and then passes through the conversion joint and the throttle control system successively and enters a solid control system. According to the double-layer continuous pipe double-gradient drilling system, a drill pipe does not need to be connected, the drilling time is saved,through monitoring of the isolation fluid and adjustment and control of the drilling pump package, the bottom hole pressure gradient is adjusted and controlled, the problem of narrow safety drillingdensity windows is solved, the advantages of lowering the drilling cost, reducing the drilling risk, and improving the efficiency are achieved, and the practicability is high.

    本发明公开一种双层连续管双梯度钻井系统,在常规钻井装备的基础上,包括双层连续管系统、隔离液、井下举升泵系统、节流控制系统和数据监控系统;动力液由钻井泵组注入,经过转换接头进入双层管环空中,经过井下举升泵,通过桥式通道进入双层连续管内管,又经过动力钻具和钻头进入井底;返回液经过回收孔进入双层连续管的环空通道,再通过桥式通道进入双层连续管内管进入井下举升泵,然后依次经过转换接头和节流控制系统进入固控系统;本发明不需连接钻杆,节约钻井时间,通过隔离液的监测和钻井泵组的调控实现井底压力梯度调控,解决安全钻井密度窗口窄的问题,具有降低钻井成本和风险,提高效率的优点,实用性强。


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    Title :

    Double-layer continuous pipe double-gradient drilling system


    Additional title:

    一种双层连续管双梯度钻井系统


    Contributors:
    ZHONG LIN (author) / WANG GUORONG (author) / LIU QINGYOU (author) / ZHOU SHOUWEI (author) / YU XINGYONG (author) / LI ZHONG (author) / TANG YANG (author) / FU QIANG (author) / HUANG XIN (author) / LI YANJUN (author)

    Publication date :

    2020-04-17


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    E21B EARTH OR ROCK DRILLING , Erd- oder Gesteinsbohren / B63B Schiffe oder sonstige Wasserfahrzeuge , SHIPS OR OTHER WATERBORNE VESSELS / F04B Verdrängerkraft- und Verdrängerarbeitsmaschinen für Flüssigkeiten , POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS



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