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US 6,306,799 B1Granted
Compositions for iron control in acid treatments for oil wells
AssigneeSchlumberger Technology Corporation
InventorsJean Pierre Feraud, Herve Perthuis, Philippe Dejeux
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Abstract
The invention relates to iron control in an acid medium for forestalling the formation of precipitates known as “sludges” (asphaltic products) in contact with certain crude oils. Use is made of compounds comprising a mercaptan function, and, in combination, a selection of catalysts. Application to acid treatments for oil, gas, water, geothermal and analogous wells, as well as to industrial cleaning.
Claims8
An acidic fluid for the treatment of a well penetrating a subterranean formation including an iron control agent comprising:
- (a) a reducing agent having the formula:
- H—S—R
- wherein R is selected from a group consisting of an aliphatic group having at least one hydrophilic function, a cycloaliphatic group having at least one hydrophilic function and a
- —CH2—Z
- group wherein Z is an aromatic group having at least one hydrophilic function;
- and
- (b) a reduction catalyst comprising cupric or cuprous ions, or a combination of cupric or cuprous ions and iodine or iodide ions.
4 more elements
Dependencies are inferred from the claim text.