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    • 3. 发明申请
    • CONTROLLING PRESSURE AND DETECTING CONTROL PROBLEMS IN GAS-LIFT RISER DURING OFFSHORE WELL DRILLING
    • 海上钻井过程中控制压力和检测气体升降机中的控制问题
    • WO0075477A8
    • 2002-02-28
    • PCT/US0015234
    • 2000-06-01
    • EXXONMOBIL UPSTREAM RES CO
    • MAUS L DONALDVAN ACKER TORNEY MEHRHARDT MARK E
    • E21B21/00E21B21/08E21B43/12E21B17/12
    • E21B43/122E21B21/001E21B21/08E21B2021/006
    • A method and apparatus for controlling the riser base pressure and detecting well control problems, such as kicks or lost circulation, during drilling of an offshore well using a gas-lifted riser. The pressure control apparatus preferably includes two separate control elements, one to adjust the pressure at the surface (prs) and the mass flow rate out of the top of the riser (mo) to compensate for changes in riser base pressure (prb) and the other to adjust either or both of the boost mud flow rate (qb) and lift gas flow rate (qg) to maintain a constant or nearly constant mass flow rate entering the base of the riser (mi). According to the method of the present invention, the well return flow rate (qw) is preferably determined by directly measuring various other parameters and then computing qw from the measured parameters. The computed value of qw may be compared to the drill string flow rate (qc) to detect well control problems, such as kicks or lost circulation.
    • 一种用于控制提升管基础压力并在使用气举提升管钻探海上井的情况下检测井控制问题(例如踢或流失)的方法和装置。 压力控制装置优选地包括两个单独的控制元件,一个用于调节表面处的压力(prs)和从提升管(mo)的顶部出来的质量流量,以补偿提升管基础压力(prb)和 另一个调节增压泥浆流量(qb)和提升气体流量(qg)中的一个或两个,以保持进入提升管(mi)的基座的恒定或接近恒定的质量流量。 根据本发明的方法,优选通过直接测量各种其它参数然后从测量的参数计算qw来确定回流流量(qw)。 可以将计算的qw值与钻柱流量(qc)进行比较,以检测井控问题,例如踢或流失。