Based on the reservoir fluid analysis for Zhongyi block of Shengli Oilfield

the effect of different carbon sources

including glucose

corn starch hydrolysates

wheat starch and sodium carboxymethyl cellulose

on activating indigenous microorganisms in the water from District 7N11 Wells was studied at high temperature (65℃)and high pressure (10 MPa)of reservoir conditions.The results showed that the carbon source could influence significantly growth cycle

community structures and metabolic activities

and the overall effect of corn starch hydrolyzates was better than others.The physical simulation experiments were carried out using the corn starch hydrolysates activator.The results indicated that oil production increased significantly

and the raise of oil recovery rate could reach 4.8% after 30 days’ activation.