Abstract: Based on the theoretical model of micro-foam microstructure and erformance,a micro-foam agent MF-1 was synthesized in labo-ratory.The performance evaluation shows that the temperature resistance capability of MF-1 is over 150℃,and the salt resistance capability is over 10 percent,and the calcium resistance capability is over 5g/L.Based on the micro-foam agent MF-1,the micro-foam drilling fluid system with a good performance was developed.The microstructure of the micro-foam drilling fluid was analyzed by microscopy.The result shows that the bubbles of micro-foam drilling fluid are suspended in single or partially connected in dot in the plane.The shape of the bubble is round,and the volume is unequal.The density of the drilling fluid changes from 0.6 g/cm³ to 0.95 g/cm³.The application of the micro-foam drilling fluid in Jin 45-15-26C Well showed that the performance of this kind of drilling fluid was stable,and the gas-liquid phase was not layered in the whole drilling process.The foam of the drilling fluid was fine,and the operation of mud pump was normal.The perfor-mances of the micro-foam drilling fluid can meet the demand of the actual drilling process.

Key words: low-pressure reservoir, under balanced drilling, micro-foam agent, micro-foam drilling fluid, stability

摘要： 根据微泡沫理论模型,在室内合成出了微泡沫发泡剂MF1.对该发泡剂的性能进行了评价。结果表明,微泡沫发泡剂MF1的抗温能力大于150℃,抗盐能力达到了10%,抗油能力达到了15%,抗钙能力达到了5g/L.在此基础上研制出了性能良好的微泡沫钻井液配方,对其结构进行了显微分析。结果表明,微泡沫气泡群体是以单个悬浮和部分相互连接的方式存在于体系中,微气泡之间在平面上为点接触,气泡呈大小不等的圆球体。该钻井液密度在0.6～0.95g/cm³范围内可调,体系稳定性良好。在锦45-15-26C井的现场应用证实,在整个钻进过程中该钻井液性能稳定,没有出现气液分层现象,泡沫细小,泥浆泵上水正常,微泡沫钻井液的各项性能均能满足现场使用的技术要求。

关键词: 低压油气藏, 欠平衡钻井, 微泡沫发泡剂, 微泡沫钻井液, 稳定性