Overall analysis on patterns of wax deposition in oil wellbore based on crude oil and wax tests

There are many complex factors which cause wax deposition in wellbore during the high wax content oil production.Therefore,it is not enough to research the patterns of wax deposition only by wax deposition in crude oil testing analysis or calculating the thickness of the wax deposition on the well wall.Comprehensively,it is necessary to do complement research on wax experimental analysis on the well wall in-site and wax deposition pattern study for different GOR oil sample under different pressure.Taking the crude oil and wax from Chang10 reservoir of Gaoping2 district ofAnsai oil field as study objective,five aspects are studied to overall analyze and understand patterns of wax deposition: testing wax deposition by viscosity-temperature curve,whole components experimental analysis of crude oil,wax sample whole components testing,wax deposition testing in different GOR and different pressure condition,and wax deposition thickness calculating on the well wall under different produced liquid quantity and produced water cut.Based the results of tests and calculation,wax deposition rules can be summarized comprehensively,which can help to guide projects of preventing and cleaning the wax with production.