Novel Application of Emulsified Acids to Matrix Stimulation of Heterogeneous Formaitons

摘要

Historically, emulsified acids have primarily been used in fracture acidizing. By combining information form theoretical studies, ex- perimental studies, and field testing, a better understanding has recently been gained of the application of emulsified acids in ma- trix acidizing. This paper discusses the use of emulsified acid as a stimulation fluid for matrix treatments in heterogeneous carbonate formations. Emulsified acid is diffusion retarded which makes it an effec- Tive wormholing fluid at low injection rates that occur, for ex- Ample, in low permeability or damaged formations. At these low Rates, plain HCl acid will mostly spend on the formation face and Is unable to create wormholes that penetrate deep into the forma- Tion.