为减少低压地层的井漏问题，室内将优选出的高效起泡剂与稳泡剂、抑制剂、降失水剂、井壁稳定剂等进行配伍，形成了微泡沫钻井液。在微观结构研究中，微泡沫显示了独特的多层膜结构特征，膜强度高，微泡沫在钻井液中分布均匀，可以有效降低钻井液的密度。室内对微泡沫钻井液性能的研究表明，微泡沫钻井液密度低，可以适应高温高压的地层条件，抑制性强，可较大幅度地提高油气层保护效果。在三塘湖油田的应用表明，微泡沫钻井液适用于封堵低压漏失地层，且现场配制简单、易于转化、维护方便，钻井液性能稳定，能够满足钻井工艺的要求，泥浆泵上水正常，应用井段钻井液密度降低到0．95 g／cm3以下，防止了井漏情况发生，减轻了油气层污染，保证了钻井工作的顺利进行。%To solve the problem of well leakage in low pressure reserve ,a circulative micro‐foam drilling fluid was developed by combining high effective foam agent with foam stabilizer ,inhibitor , filtrate reducer and borehole stabilizer .The unique multilayer film structure of micro‐foam is made up of one nucleus and two layers and three layers film ,and the micro‐foam has a high film strength and can be uniformly dispersed in drilling fluid ,w hich can efficiently reduce the density of drilling fluid . The performance evaluation indoors shows that the density of drilling fluid is low ,and it is fit for HTHP formation ,the rejection capability of drilling fluid is strong ,which can effectively enhance reserve protection effect . The applications in Santanghu oilfield demonstrate that the micro‐foam drilling fluid is suitable for plugging the low‐pressure circulation‐lost zones .The drilling fluid is easy to prepare ,transform and maintain in field application .The property of drilling fluid is stable ,which can meet the requirement of drilling process ,and the mud pump works as normal .The drilling fluid density is less than 0 .95 g/cm3 ,which prevents the well leakage and reduces the reserve pollution .It is approved that the micro‐foam drilling fluid is helpful for drilling safety and quality .
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