Improved Matrix Stimulation

Quoc P. Nguyen

Matrix acidizing is the most prevalent technique used in modern formation stimulations. Several issues exist that might reduce the incentive to optimize matrix treatment technology.

Of note:

  • It is appropriate to approach these issues from different scales and perspectives to obtain a new unified mechanistic model for matrix acidizing that meets practical performance needs.
  • Although the principles of matrix acidizing have been well established, the interactions between reaction kinetics and the ensuing evolution of the fluid and rock properties are not completely understood.
  • Currently existing acid reaction retardation techniques (e.g. oil-acid emulsion, retarded acid system with fluoboric acid) have proved effective, but not desirably controllable.
  • Complex plugging and transport of precipitates have been oversimplified in current models.
  • Misuse of mechanical and chemical diverters sometimes aggravate formation damage.
  • Little effort has been made on upscaling descriptions of the pore-scale processes utilizing available laboratory observations and on validating lab results using field data.
  • More attention needs to be paid to acidizing in different geological and flow models (e.g. layering, linear and radial flow).