地层水侵入对连续管泡沫钻井参数的影响
Journal of Daqing Petroleum Institute（2010）
Abstract
针对连续管泡沫欠平衡钻井过程中地层流体侵入问题,建立连续管泡沫钻井中地层流体侵入模型. 采用交错网格对该模型进行离散,并利用SIMPLEC方法结合亚松弛方法求解离散方程. 实例分析表明,地层水侵入流量随注气流量的增大而增大,随产水指数的增大而增大. 地层水的侵入使井底压力增加,泡沫稳定性降低,泡沫携岩能力增强,而且产水指数越大,影响越明显;增加注气流量或减少注液流量可减弱甚至抵消地层水侵入对井底压力、泡沫稳定性和泡沫携岩能力的影响.
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Key words
coiled tubing,stability of foam,capability of cuttings transport,inflow of formation water,bottomhole pressure,foam drilling
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