为防止钻井井喷失控,针对钻井气侵情况,从井涌及压井过程中井筒溢流特性出发,建立了气液两相流气侵计算模型,给出了不同时期的初边值条件,采用有限差分法求解.模拟结果表明,钻进期间立管压力与气侵速度和气侵高度呈一一对应关系,常规压井期间套管压力与气侵速度和气侵高度呈一一对应关系.基于以上原理提出了钻进期间主管压力法和压井期间套管压力法,利用相关系数判断钻进及压井期间不同时刻的气侵速度及气侵高度.并开发了计算机自动判断气侵速度及运移高度系统,为气侵参数的判断提供了理论依据.%Uncontrollable blowout is a great drilling accident. For gas kick during drilling, in order to prevent uncontrollble blowout, the gas-liquild two-phase flow model is established, considering the kick characteristics in well kick and well killing process, and it is solved with finite difference method, given initial values in different periods. The results indicated that a one-to-one correspondence was established between standpipe pressure and kick rate and height while drilling, and another one-to-one correspondence was also established between casing pressure and kick rate and height while well killing. Based on the findings above, the standpipe pressure method and casing pressure method were proposed to detect kick, and the related coefficient method was used to judge the kick rate and height during drilling and killing. Meanwhile, a computer system was developed to judge kick velocity and height automatically, which provided a theoretical basis for kick parameter judgement.
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