A New Oil-Based Drilling Fluid System for Enhancing the Stability of Deep Well Settlement Under High Temperature and High Pressure Conditions
摘要
In order to solve the technical problems of high temperature and high pressure drilling in deep wells, the rheological properties are difficult to control due to the high density of drilling fluid, insufficient temperature resistance caused by well depth, and frequent well leakage caused by the development of formation fractures. Based on the research and performance evaluation of high-temperature resistant emulsifiers for oil-based drilling fluids, a set of XZ high-efficiency oil-based drilling fluid system has been perfected through material optimization and system formulation optimization. This system has good high-temperature stability, sealing effect, anti pollution ability, and settling stability, and can meet the needs of different formations; The developed oil-based drilling fluid anti high temperature flow regulator has solved the problem of settling stability in high-temperature and high-pressure deep well completion and oil testing operations, forming an XZ anti high temperature high-density oil-based completion fluid system with a density of 2.5 g/cm3, temperature resistance of 220°C, and high temperature static settling stability of 15 days.