Synthesis of Novel Activity Regulators and Application of Low Activity Water-based Drilling Fluids
In order to solve the problem of wellbore instability caused by the hydration dispersion expansion of clay minerals after water absorption caused by liquid phase intrusion in water-based drilling fluid,activity regulator Urea-Gyl-DES was prepared by heating and stirring method,and its performance evaluation,Fourier infrared spectroscopy(FT-IR)analysis and influence evaluation on water-based drilling fluid were conducted.The experimental results show that the relative inhibition rate can reach 100%when the Urea Gyl-DES dosage is 0.5%.By FT-IR scanning Urea-Gyl-DES,hydrogen bond network is formed and no new compounds are produced in eutectic system.The Urea-Gyl-DES is added to the water-based drilling fluid with good temperature resistance and good fit of drilling fluid system.Urea Gyl-DES has a dual effect of reducing ion activity while effectively inhibiting shale hydration dispersion.
NETL
NSTL
万方数据
