Synthesis and Evaluation of a High Temperature Inhibitive Additive

A high temperature inhibitive agent,FT-200 has recently been developed for use in high temperature deep well penetrating complex formations.FT-200 was developed through design of molecular structure,optimization of deformation and dispersion properties,and optimization of reaction raw materials and synthesis method.FT-200 deforms at high temperature and plugs micro fractures through elasticity.It improves the strengths of unstable formations through cementation.Characterization of FT-200 through IR spectrum,NMR spectrometry,elementary analysis and TGA reveals that FT-200 has excellent high temperature property,fulfilling the design objective.Evaluation of the performance of FT-200 in drilling fluids indicates that FT-200 functions normally at temperature up to 200℃,and shales treated with FT-200 drilling fluid have their permeability reduced by more than 70%.The quality of mud cakes is improved by FT-200,and HTHP filter loss can be reduced remarkably using FT-200.FT-200 is compatible with commonly used drilling fluid additives,and it effectively seals off the micro fractures found in hard-brittle shales.