Softened brine treatment of crude oil
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United States of America Patent
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Dec 12, 2000
Issued Date -
N/A
app pub date -
Sep 21, 1999
filing date -
May 20, 1997
priority date (Note) -
Expired
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Abstract
A method for removing corrosive inorganic cations--such as calcium magnesium cations--from a crude oil stream by mixing the stream with a softened brine wash water that has been softened by removal or replacement of precipitating divalent or trivalent cations with non-precipitating cations. The crude oil stream and the wash water are mixed at a temperature from about 98.degree. C. to about 150.degree. C. to form an emulsion wherein the corrosive inorganic cations are transferred from the crude oil to the wash water, The emulsion is then broken to form a crude oil fraction and an aqueous fraction containing at least a portion of the corrosive inorganic cations from the crude oil. This method is particularly useful in areas where freshwater is not readily available.
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