Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Qi Qu0
Xiaolan Wang0
Date of Patent
April 12, 2011
0Patent Application Number
110159280
Date Filed
December 17, 2004
0Patent Primary Examiner
Patent abstract
Unwanted heat loss from production tubing or uncontrolled heat transfer to outer annuli is inhibited by introduction into the annuli a thermal insulating packer fluid or a riser fluid containing a zwitterionic surfactant, an alcohol and a brine. The viscosity of the composition is sufficient to reduce the convection flow velocity within the annulus. The invention has particular applicability with high density brines.
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