| 摘要 |
<p>Methods are provided for selectively placing a barrier to fluid flow within water rich strata or played out strata of a subterranean formation, thebarrier being established at some distance remote from a wellbore. The methods involve first washing a desired volume of formation with an acid solution suchas HCl. The acid solution is effective to extract and remove polyvalent metal ions from the formation material. Next an acidified resin emulsion composition comprising an oil soluble, acid stable resin is injected into the formation. The resin emulsion traverses the washed region without plugging. When the resin reaches the outer edge of the washed region the acidified emulsion extracts metal ions adsorbed to the unwashed formation material. The extracted polyvalent metal ions are effective to demulsify and coalesce the resin, thereby establishing a relatively impermeable barrier to subsequent fluid flow. The methods of this invention have application in a wide variety of profile control techniques for effecting conformance or sweep efficiency in oil bearing subterranean formations.</p> |
