Paper: Preflush Concepts In Fracture Acidizing

Water preflushes have been used for many years to precede acid fracturing treatments. One of the primary functions performed by the preflush is to establish injectivity into the reservoir before acid fills the tubular goods. Preflushes also perform other functions which can contribute to more efficient use of acids and provide greater effectiveness from acid fracturing. This paper discusses the influence of preflushes on acid fracture designs and describes preflush systems which have been used successfully.