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
much surfactant chemistry involved in this method. Only trained
professionals should perform this work.
Eugene for more information.