Clay-free, thixotropic wellbore fluid
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United States of America Patent
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Jan 27, 1981
Issued Date -
N/A
app pub date -
Mar 13, 1978
filing date -
Mar 13, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A clay-free wellbore fluid having thixotropic properties, good surface handling characteristics and excellent subterranean characteristics such as particle handling gel strength, and low water loss has been devised by the combination of a heteropolysaccharide prepared by the action of bacteria of the genus Xanthomonas on carbohydrates, modified starch and MgO. In some situations a salt of lignosulfonate is added to maintain the desirable properties of the wellbore fluid.
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