Title: Method for delaying the setting of and acid-settable liquid in a terrestrial zone

Abstract: In an improved method for the treatment of a permeable formation or zone adjacent to the bore of an oil well, the setting time of an acid-settable liquid is predictably delayed by use of a novel catalyst system. The method provides an effective means for controlling the reduction of the permeability of the formation or zone in a single stage treatment by dissolving the catalyst in the liquid and introducing the solution into the formation. The catalyst system comprises a mixture of a suitable acid-releasing compound and a base.

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Inventors: Hess, Patrick H. (Diamond Bar, CA, US)

Application Number: 418624
Filing Date: 1973-11-23
Publication_date: 1976-03-09
Assignee: Chevron Research Company (San Francisco, CA)
Primary Class(es): 523/130 166/295, 524/803, 526/270, 528/230, 528/232
Other Classes:
US Patent Ref:

2399055	Apr, 1946	Nordlander	260/67.
2471600	May, 1949	Adams Jr. et al.	260/88.
2499275	Feb, 1950	McWhorter	260/67.
3209826	Oct, 1965	Young	166/295.
3597386	Aug, 1971	Brabander	260/67.
3700604	Oct, 1972	Metil	260/67.
3759327	Sep, 1973	Carnes	166/295.

Other Refs:
Primary Examiner: Rzucidlo, Eugene C.
Assistant Examiner:
Attorney: Magdeburger; G. F., Stoner, Jr.; John, Turner; W. Keith