Acid Wash, Matrix Acidization and Acid fracturing treatment

What is difference between Acid Wash, Matrix Acidization and Acid fracturing treatment ?

Acid Wash, Matrix Acidization and Acid fracturing treatment all are treatments which involve injection of acid into well bore.

In Acid wash treatment we inject Acid for clean up (wax or paraffin di position) of tubing and perforation only.

So, small volume of acid is used in Acid washing treatments.

In matrix Acidization treatments, we use sufficient amount of acid volume so that it can clear clogged pores of reservoir rock (or remove formation damage) near well bore area/till some area near well bore.

So, matrix acidizing is used to restore permeability lr productivity.

It is used more over in sandstone reservoirs.

In Acid fracturing treatment, we inject acid at higher pressure than fracture pressure of formation.

So, it will initiate fracturing of reservoir rock. After fracturing of rock also, we inject acid so that acid can itch the created fracture and acid can penetrate more inside reservoir for creating more permeability near well bore region.

Acid fracturing is used to enhance productivity of formation.

It is generally used in carbonate reservoir rocks.

We do not use propants here as we used in Hydraulic Fracturing job. Itched perforations are our way for retaining permeability.

So,

Depth of investigation wise,

Acid fracturing > Matrix acidization > Acid wash.

For sum up, you can watch this video.