As a horizontal well, NP23-P2002 is aimed at efficient development of one fault block oil reservoir of No. 2 Nanpu structure buried hill reservoir. The bottom hole temperature of target stratum exceeds 150℃ and the formation pressure coefficient is between 0.99 to 1.01, well leakage or overflow occurs even with a slight fluctuation, so carrying sand is the key to horizontal section of the construction. 0.94-0.96 g/cm3 density of the oil-in-water drilling fluid is used in this well. Through preferred treating-agent and oil-water ratio adjustment, the final formulation of the oil-in-water drilling fluid is determined. The site application shows that the system completely meets the requirements of underground construction, and the high temperature resistance and sand-carrying problems have been successfully resolved. Nanpu Oilfield exploration and development purposes are successfully achieved under the under-balanced operation, 3-4 Mpa under pressure, and remaining 2 m above the flame height.%NP23-P2002井为开发水平井,钻井目的为高效开发南堡2号构造潜山老堡南1断块油藏.该井目的层井底温度高达170.℃,地层压力系数在0.99～1.01之间,稍有波动就会发生溢流或井漏,同时小井眼水平钻井对钻井液的井眼净化和携砂能力要求高,因此决定使用密度为0.94～0.96 g/cm3的水包油钻井液进行欠平衡钻井施工.室内实验对水包油钻井液的配方进行了优选.现场施工表明,该体系满足了井下施工要求,顺利解决了抗温、携砂问题,保证了井下安全,实现了欠平衡钻井施工,欠压3～4 MPa,顺利实现了南堡油田的勘探开发目的.
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