Oil well acidizing with iron chelating derivatives of aldohexose

Details Oil well acidizing with iron chelating derivatives of aldohexose Oil well acidizing with iron chelating derivatives of aldohexose

1992-02-24

1994-03-15

Geist, Gary

Wells

Processes

Placing fluid into the formation

252 8553, E21B 4327

Patent

active

052939421

ABSTRACT:
This invention relates to the use of certain keto and diketo acids, esters and salts that are derived from aldopentoses and aldohexoses, to maintain very high levels of iron in solution under oil well acidizing conditions. The compounds described herein chelate ferric iron at low temperatures and are activated by heat to reduce ferric iron to the more soluble ferrous species at high temperatures. Because of these properties and their extraordinarily high solubility in hydrochloric acid, such compounds are capable of maintaining considerably more iron in solution than competing materials.

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Mehltretter, CL, et al, "Sequestration of Sugar Acids" Industrial and Engineering Chemistry, vol. 45, No. 12, Dec. 1953, pp. 2782-2784.
Williams et al, Acidizing Fundamentals, Chapters 1, 3, 4, 5, 6, 7, 8, Society of Petroleum Engineers of AIME, New York, 1979.
Smith et al, Secondary Deposition of Iron Compounds Following Acidizing Treatments, Society of Petroleum Engineers paper No. 2358, presented at the SPE-AIME Eastern Regional Meeting, Charleston, W.V., Nov. 7-8, 1968.

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