Numerical Simulation Research On Horizontal Well To Exploit Remaining Oil Of Lateralaccretion Interbed After Polymerflooding

Directing at lateral accretion interbed layers, wedge-shape and wedge out models areused to analysis polymerflooding development effect using Eclipse numerical simulationsoft.And the distribution location of remaining oil is given after waterflooding andpolymerflooding.The recovery is provided including two parts which are lateral accretioninterbed and non-lateral accretion interbed. Horizontal well and vertical well are united toexploit remaining oil, in which case, the vertical and horizontal positions of horizontal wellare optimized. Simple model is used to analysis the effect of water injection directions, singlewell injection rate per day, interlayer shelter on recovery. and residual oil distribution.Location of horizontal wells and injection or production wells are optimized. According tonumerical simulation results, the physical model with lateral accretion interbeds is made andused to do displacement experiment.Numerical simulation results indicate that:(1) injectiong water in the direction of lateralaccrretion interbed can obtain higher water drive recovery than in the opposite direction. Asthe shield degree increased, the recovery will drop.(2) The closer to top the horizontal well is,the greater recovery enhancement values is. Horizontal hole section starts from the location offour-fifths of lateral sandbody I left and terminats nine-tenths of lateral sandbody III, wherethe recovery is highest. Horizontal well should be producing well and vertical well is injectionwell. Horizontal well is placed after vertiacal well injecting polymer in which recovery canincrease9.83%. According to numerical simulation optimization results, we have made aphysical model with lateral accrretion interbeds to do experiments. Numerical simulationresults agree with experimental results. Hence horizontal and vertical well uinting togethercan exploit the remaining oil of lateral accrretion interbed effectively.(3) The closer to top thehorizontal well is, the greater recovery enhancement values is for wedge-shape models.Horizontal hole section starts from the location of seven-eighths of lateral sandbody I left andterminats seven-eighths of lateral sandbody IV, where the recovery is highest, which is6.69%.(4) The closer to top the horizontal well is, the greater recovery enhancement values is forpinch-out models. Horizontal hole section starts from the location of seven-eighths of lateralsandbody I left and terminats seven-eighths of lateral sandbody IV, where the recovery ishighest, which is5.61%.