ESTIMATING DIFFUSION COEFFICIENT FOR A RESERVOIR STIMULATION FLUID

摘要

The subject disclosure relates to matrix acidizing. More specifically, systems and methods are described for estimating a diffusion coefficient for an acid fluid used to stimulate a subterranean reservoir wherein a spent acid is formulated that includes one or more by-products of the reaction between the fluid and rock. A rock sample, such as in the form of a rotating disk is exposed to spent acid under elevated pressure and temperature conditions while the fluid is sampled and analyzed. A diffusion coefficient for the spend acid is estimated.

主权项

1. A system for estimating a diffusion coefficient for a stimulation fluid used to stimulate a subterranean reservoir rock by at least partially dissolving the subterranean reservoir rock, the system comprising:
a sealed reaction vessel configured to expose a partially spent stimulation fluid to a sample of reactant material under elevated pressure conditions such that the reactant material reacts with the partially spent stimulation fluid, the partially spent stimulation fluid being pre-formulated to include one or more reaction by-products being of a type produced during reaction of the stimulation fluid with the reservoir rock; and a data acquisition and processing system configured to measure properties of the partially spent stimulation fluid after at least some of the reactant material has reacted with the partially spent stimulation fluid and estimate therefrom a diffusion coefficient for the stimulation fluid under partially spent downhole conditions.