Composition and method for controlling precipitation when acidiz

Details Composition and method for controlling precipitation when acidiz Composition and method for controlling precipitation when acidiz

1995-11-13

1997-04-22

Gibson, Sharon

Earth boring, well treating, and oil field chemistry

Preventing contaminant deposits in petroleum oil conduits

507203, 507263, 585950, 208 48R, 208 48AA, 166304, 134 39, 134 40, 134 42, 210698, C09K 700, E21B 3706

Patent

active

056229194

ABSTRACT:
A composition and method for acidizing a formation in the presence of ferric ion, free sulfur and/or sulfides is disclosed. The composition employs a ferric ion reducing agent and a sulfide reactant separately or in combination. The ferric ion reducing agent is a thioalkyl acid. The sulfide reactant compounds include .alpha.-diketones and saturated and .alpha.-unsaturated cyclic ketones. In another aspect, the reducing activity of the thioalkyl acid is accelerated by the presence of a catalytic quantity of a compound or mixture of compounds which yield in acid solution cuprous ion, cupric ion or combinations thereof with iodide ion.

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