Asphaltene precipitation during natural depletion and miscible gas injection is a common problem in oilfields throughout the world. In this work, static precipitation tests are conducted to investigate effect of pressure, temperature and gas type and concentration on asphaltene instability. Three different oil samples are studied under reservoir conditions with/without nitrogen and methane injection. Besides applying common thermodynamic models, a new scaling equation is presented to predict asphaltene precipitation under HPHT gas injection. Published data from literature are also used in model development. The scaling approach is attractive because it is simple and complex asphaltene properties are not involved in the calculations. Moreover, the proposed model provides universal parameters for different fluid samples in a wide range of pressure and temperature that makes it novel for evaluation of future gas injection projects when simple PVT data are available.

Keywords:
paraffin remediation, scale remediation, flow assurance, wax inhibition, production chemistry, upstream oil & gas, wax remediation, hydrate remediation, hydrate inhibition, asphaltene remediation
Subjects:
Production Chemistry, Metallurgy and Biology, Flow Assurance, Fluid Characterization, Improved and Enhanced Recovery, Inhibition and remediation of hydrates, scale, paraffin / wax and asphaltene, Precipitates (paraffin, asphaltenes, etc.)
Copyright 2011, Society of Petroleum Engineers
You can access this article if you purchase or spend a download.