苏丹Azraq地区提高机械钻速的钻井液技术

针对苏丹Azraq地区地层特点,对提高机械钻速的钻井液性能参数进行研究,根据理论和实验优化钻井液性能参数。调整钻井液滤失量为6~8 m L,塑性黏度为15~20 m Pa s,动切力为10~15 Pa,动塑比为0.75 Pa/m Pa s。根据优化的钻井液性能参数,采用无土相的硅酸盐钻井液体系,并通过实验确定钻井液配方。现场应用证明,新的钻井液工艺能显著提高Abu Gbura地层的机械钻速,机械钻速由6~8 m/h提高到12~18 m/h,缩短了完井周期。Azraq K-9井创造了该地区完井时间的最短记录。

Drilling Fluid Technology to Enhance ROP in Azraq,Sudan

Optimization of drilling fluid property was studied in laboratory to aim at rate of penetration (ROP) in Azraq area in Sudan. The optimized drilling fluid had filter loss of 6-8 mL, plastic viscosity (PV) of 15-20 mPa·s, yield point (YP) of 10-15 Pa and an YP/PV ratio of 0.75 Pa/mPa·s. A clay-free silicate drilling fluid with these properties was formulated through laboratory experiment. With this drilling fluid the ROP was increased from 6-8 m/h to 12-18 m/h in the Abu Gbura formation. The well Azraq K-9 was completed in the shortest period of time in this area.