塔河深侧钻井油基钻井液完井技术

Completion Technology of Oil-Based Drilling Fluid for Deep Sidetracking well in the Tahe Oilfield

摘要: 针对塔河油田深侧钻井在完井期间，因井眼轨迹不平滑，狗腿度大，所用聚磺混油钻井液无法满足支撑管柱顺利下入的技术难题。基于回收高密度油基钻井液、新配制低密度油基钻井液性能评价以及井眼容积考虑，优化、配制出了的油基钻井液现场性能监测表明高速搅拌后破乳电压值可达500~700 V之间，塑性粘度21~24 mPas，动切力6~8 Pa，表明现场油基钻井液具有良好的乳化稳定性和流变性。应用油基钻井液后，确保了支撑管柱顺利下到预定井深，支撑管柱下放摩阻最高仅为6 t，上提最大摩阻10 t，体现了油基钻井液良好的润滑性及井眼稳定性。

Abstract: During the completion of the deep sidetracking well in Tahe Oilfield, due to the uneven trajectory of the wellbore and the large dogleg degree, the polysulfonate mixed oil drilling fluid cannot meet the demand of running the support pipe string. Based on the performance evaluation of the recovered high-density oil-based drilling fluid, the performance of the newly prepared low-density oil-based drilling fluid, and the wellbore volume considerations, on-site performance monitoring of the optimized and prepared oil-based drilling fluid showed that the demulsification voltage value after high-speed stirring can reach 500~700 V, plastic viscosity 21~24 mPas, dynamic shear force 6~8 Pa, indicating that the on-site oil-based drilling fluid has good emulsification stability and rheology. After the application of oil-based drilling fluid, it is ensured that the support pipe string is smoothly lowered to the predetermined well depth. The maximum lowering friction resistance of the support pipe string is only 6 t, and the maximum lifting friction resistance is 10 t, which reflects the good lubricity and wellbore stability of the oil-based drilling fluid.