Development Of Deep Water Oil Base Drilling Fluid

With the rapid progress of drilling technology and the cognitive level of the growing offshore oil resources, for offshore oil resources of Marine oil and gas exploration and development from the shallow to the deep sea, and even ultra deep sea. Deep well operation situation was complex, the drilling fluid is faced with many problems, such as drilling fluid rheology control under wide temperature range, low temperature under the high density of gas hydrate, settlement of weighting materials under high temperature and high density, and narrow pressure window of drilling fluid leakage problems. So the development of Marine deep water drilling fluid is imminent. Oil-base drilling fluid relative to the water-based drilling fluid has good temperature resistance and controllable rheological properties, good stability, sludge resistance, resistance to water pollution ability, narrow window can maintain good sedimentation stability under the condition of pressure and filtration, choose oil-base drilling fluid as Marine deep water drilling fluid is the best choice.This article first to the deepwater oil-base drilling fluid technology research, and analyze the mechanism of oil-base drilling fluid treatment agent, through the mechanism analysis and experimental verification screening several key performance is the best treatment agent,Second, master the influence law of different conditions on the oil-base drilling fluid rheological property, by a single dose evaluation and system evaluation of two kinds of methods for treating agent added amount and ratio adjustment, to select the optimal treatment agent added amount, and the synthetic evaluation of the two kinds of emulsifier, flow Pattern regulator key treatment agent, including synthesis of emulsifier stable electricity in the system performance is strong, deep water flow Pattern regulator can meet the low temperature adjustment of oil-base drilling fluid rheological properties, and can improve drilling fluid shear. Finally, complete the deep oil-base drilling fluid, the optimal formula, this deep water cut oil-base drilling fluid with low viscosity high, wide temperature and pressure range.The final formula:Base oil(gas to liquid 185V)+The main emulsifier(SP-80+Calcium stearate)+Auxiliary emulsifier(OP-10)+2% of Homemade organic soil+1% of Flow Pattern regulator+1.2% of Wetting agent(WET-L)+3% of filtrate reducer(HFR-L)+2.5% of Calcium oxide+25% of Saturated calcium chloride solution+barite,oil-water ratio,8:2.