The asphalt precipitation and deposition in the tubing inside wall have a serious impact on the well testing and the preproduction downhole operations in Yada oilfield, Iran, for example, they hinder the slickline tool running and the retrieving of downhole tools. In order to identify the asphalt precipitation and the precipitation trend and behavior in the crude oil, based on reservior characteristics in Yada oilfield, the asphalt precipitation extent is analyzed using a quantitative calculation for the colloidal system stability and the SARA data. Based on the thermodynamic equilibrium theory and the solid model, in combination with the predicted temperature and the pressure profiles inside tubing at different production rates, the initial pressure and temperature of the asphalt precipitation are analyzed and forecasted, and through laboratory testing, the asphalt scavengers are evaluated and optimized. The quantitative calculation results about the crude oil colloidal stability show that the crude oil colloidal system tends to be unstable and the asphalt separation is made easy. The predicted depth for the asphalt precipitation is in the range of 3000-3780 m, which indicates that since the beginning of the production wells the asphalt precipitation is unavoidable. Asphalt scavenger lab test results show that a single scavenger can not achieve satisfactory results, and an optimization for operation and treatment is proposed.
HE Hanping
,
HUANG Jianlin
,
ZHAO Fenglan
,
LIU Huanle
. Asphaltene Precipitation Analysis in Well Testing in Yada Oilfield, Iran[J]. Science & Technology Review, 2014
, 32(21)
: 52
-55
.
DOI: 10.3981/j.issn.1000-7857.2014.21.008
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