INTERNAL BREAKER FOR OILFIELD TREATMENTS

摘要

A composition and method for improving the fluid efficiency of many oilfi eld treatments is given. The composition is a solid additive, in a viscosifi ed fluid, in a size range small enough that it enters formation pores; it op tionally bridges there to form an internal filter cake, and then decomposes to provide a breaker for the viscosifying system for the fluid. Examples of suitable additives include waxes, polyesters, polycarbonates, polyacetals, p olymelamines, polyvinyl chlorides, and polyvinyl acetates. Degradation of th e additive may be accelerated or delayed.