Research On The Calculation Method Of Chaoyanggou Oil Recovery Of Low Permeability Oilfield

In recent years, a center of scientific research and field trials conducted primarily Chaoyanggou oilfield is around EOR and increasing recoverable reserves. So EOR technology is the main content of Chaoyanggou oilfield research. But now a variety of formulas for calculating recovery of low permeability and ultra-low permeability oil field does not apply. Since these formulas does not take into account the effect of effective drive system and the way sand body connectivity, the direction of connectivity and other conditions on recovery. Calculated recovery is quite different from the actual development situation. Especially for the three blocks which cannot able to establish effective drive system in the 300 m spacing. For example, east block of Chao2, recovery average is 14.8% which is using a variety of methods to calculate. Actually the block has shut all and the degree of recovery is only 2.0%.This is much difference with the calculated value, therefore, carry out this task. Research recovery calculation method which is adapt for low permeability and ultra-low permeability reservoir.In this study, according to the experimental data to calculate the Chaoyanggou oilfield one, two, three blocks of the largest water flooding recovery. Evaluate the problem of the calculation of low permeability oilfield water flooding recovery in all flooding rule curve. Propose water flooding recovery calculation method which is considered of effective drive system. This method takes the relationship between the degree of water flooding control and well spacing, injection well ratio, the size of the sand into account and proposes effective driving factor calculation method. In addition, application the method of Numerical Simulation, calculate the displacement efficiency considered the condition of Chaoyanggou oilfield one, two, three blocks well networks and fracture in different directions, oil and water well in different connectivity degree; correct reservoir heterogeneity and different relative permeability curves, and ultimately, propose recovery comprehensive calculation method for Chaoyanggou low permeability oilfield.