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利用漏斗粘度法考察了增粘剂、降滤失剂、油层保护剂和加重剂对钻井液粘度的影响,确定了无固相钻井液初始配方范围为:增粘剂1%～3%、降滤失剂1%～3%、油层保护剂1%～3%、加重剂适量。通过L_(25)(5~6)正交实验,从粘度、切力、滤失量等性能对钻井液配方进行优化,确定了无固相钻井液配方为:增粘剂2%、降滤失剂2%、油层保护剂2%、加重剂适量。此钻井液静切力小,表观粘度42.1 mPa·s,动切力11.3 Pa,润滑系数0.0787,API滤失量5.5 mL,HTHP滤失量14.2 mL。
The influence of viscosifier, filtrate reducer, reservoir protection agent and weighting agent on the viscosity of drilling fluid was investigated by using the funnel viscosity method. The initial formulation range of non-solid drilling fluid was determined as follows: tackifier 1% -3%, drop Filtration loss of 1% to 3%, reservoir protection agent 1% to 3%, weighting agent amount. Through the orthogonal experiment of L25 (5 ~ 6), the formulation of drilling fluid was optimized from the properties of viscosity, shear force and fluid loss, and the formula of non-solid drilling fluid was determined as follows: tackifier 2% Loss of 2%, reservoir protection agent 2%, weighting agent amount. The drilling fluid has low static shear force, apparent viscosity of 42.1 mPa · s, dynamic shear force of 11.3 Pa, lubrication coefficient of 0.0787, API filtration loss of 5.5 mL and HTHP filtration loss of 14.2 mL.