Sandstone Acid Treatment

Over time, wells decrease production rates for a number of reasons.  A common reason is the increased accumulated concentration of scale in the pore spaces and the production string.  Scale Inhibitors are a proactive approach which prevents this buildup from happening in the first place.  Acid Treatments are implemented to remove scale buildup that has already occurred.

Scale buildup can occur over weeks, months, or even years.  Since most scale is water soluble, formations that produce water or those that have water injected into the formation usually have this problem at some time.

A typical method^* usually used in a Conventional Sandstone Acidizing Procedure is:

1) Acid Pickling

2) Solvent Treatment

3) Acid Preflush

4) Main acid

5) Acid and/or NH₄Cl and/or Solvent Overflushes

6) Displacement

*CAUTION-There is much surfactant chemistry involved in this method.  Only trained professionals should perform this work. 

Contact Eugene for more information.