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COMPLEXATION OF CALCIUM IONS IN THE PRESENCE OF QUATERNIZED AMINE COMPOUNDS WHILE ACIDIZING A SUBTERRANEAN FORMATION.
COMPLEXATION OF CALCIUM IONS IN THE PRESENCE OF QUATERNIZED AMINE COMPOUNDS WHILE ACIDIZING A SUBTERRANEAN FORMATION.
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机译:酸化地下形成时,季铵化合物存在时钙离子的络合。
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摘要
Acidizing operations in subterranean formations that contain both a siliceous material and a source of calcium ions can often be problematic due to the generation of calcium-containing precipitates, particularly calcium fluoride. Methods for treating a subterranean formation can comprise: providing a treatment fluid having a pH ranging between about 1 and about 4.5 and comprising a chelating agent, hydrofluoric acid or a hydrofluoric acid-generating compound, and a compound having two or more quaternized amine groups; introducing the treatment fluid into a subterranean formation containing a siliceous material and a source of calcium ions; dissolving at least a portion of the siliceous material in the subterranean formation with the hydrofluoric acid or the hydrofluoric acid-generating compound; and complexing at least a portion of the calcium ions in the subterranean formation with the chelating agent.
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