FILTER CONTROL HPHT ADDITIVE FOR OIL-BASED DRILLING FLUIDS WITH PETROLEUM COKE

摘要

A method for controlling filtration loss during drilling to a downhole hydrocarbon bearing formation by drilling with a drilling fluid containing a filtration control additive that is made up of petroleum coke particles impregnated with a cationic surfactant and coated with a butadiene-styrene polymer.