METHOD AND COMPOSITION FOR TREATING HIGH-TEMPERATURE SUBTERRANEAN FORMATIONS

摘要

A water-insoluble particulate composition have controlled slow oil-solubility at elevated temperatures is disclosed. The composition is comprised of solid particles of a homogeneous mixture of (1) about 4 to 30 weight percent of an ethylene-vinyl acetate copolymer containing about 15 to 30 weight percent vinyl acetate, (2) a paraffin wax having a melting point between about 130 DEG F. and 175 DEG F., and (3) about 10 to 25 weight percent of a long chain aliphatic hydrocarbon or oxidized hydrocarbon wax melting between about 195 DEG F. and 250 DEG F. and exhibiting an Izod strength of less than 0.9 foot-pounds. Also disclosed is a process employing this particulate composition in drilling wells into high-temperature subterranean formations, and in fracturing and treating such formations.