Modification of waste persimmon peel and application in water-based drilling fluid

Abstract

To develop an green drilling fluid additive, the modification and application of persimmon peel in water-based drilling fluid was studied in this work. A series of natural product derivative, aluminium chloride-persimmon peel (ACPP), was prepared from aluminium chloride and persimmon peel, and was assessed as shale inhibitor. Clay-swelling ratio in 0.3% ACPP-3 solution was reduced to 28.1% from 69.5%. Rolling recovery tests and rheological evaluation of drilling fluids concluded that ACPP-3 has high inhibition property to montmorillonite hydrated expansion. ACPP-3 can adjust the particle size of montmorillonite in a large scale. ACPP-3 reduces the apparent viscosity (AV) of carboxyl methyl cellulose (CMC) drilling fluids effectively and reduces the volume of filtration, furthermore, ACPP-3 can reduce the viscosity and the volume of filtration under high temperature, which can be used as a additive for deep drilling. The inhibition mechanism of ACPP-3 was investigated by thermogravimetric analysis and scanning electron microscope. The results will benefit the related work in the eco-friendly drilling fluid materials.