primary depletion and miscible gas injection effects on asphaltene stability in petroleum reservoir fluids

Natural depletion of petroleum reservoirs and also gas injection for enhance oil recovery, are unavoidable processes in oil industry. Foremost, prediction ofn the problems due to these two processes is very necessary and important.There existinnumeral experimental observation showing that heavy organic deposition, espacially asphaltene deposition, are principal results during these processes. Results of laboratory simulation of asphaltene deposition during natural depletion of petroleumreservoirs and also during gas injectin and enhanced oil recovery(EOR) processes arereported here. This is achieved through the design of new experimental setup for investigation of pressure and composition effects on asphaltene deposition in petroleum fliuds at high pressure and high temperature conditions. In this work asphaltene deposition during decreasing pressure, from pressures graeter than reservoirs pressure to a pressures below the bubble point pressure(natural depletion) and also asphaltene deposition during natural gas injection in reservoirs condition, are studied for three samples (one recombined samples and two bottomhole samples). All of the obtained results from this work conform to theoritical and experimental works.

کلیدواژه ها:

Asphaltene ، Laboratory simulation ، Petroleum reservoir fluid ، Gas injection ، Swelling test ، Bubble point pressure ، Enhanced oil recovery