低流压下油井产能预测方法研究

PREDICTION METHOD OF OIL WELL PRODUCTIVITY UNDER LOW FLOWING PRESSURE

本文从理论上指出,美国广义IPR方法仅适用于流压较高的情况。文中根据油气层渗流理论,结合本油田实际,导出了低流压下油井产能预测新公式。经大庆油田40井次系统试井验证,新公式不仅适用于流压较低情况,也适用于流压较高情况,平均相对误差5.64％。根据该公式预测,当流压低于某值时,产量将随之降低。这一结论,对油田高含水后期提高排液量稳产试验有着重要指导意义。

<ABSTRACT>: Theoretically, the generalized IPR method used in USA is only suited to higher flowing pressures. Based on the theoretics of fluid through porous media of oil & gas reservoirs, combined with oil field practice, a new formula of predicting oil well productivity under low flowing pressu-res is deduced in this paper. After systematical testing on 40 well-times in Daqing oilfield the new formula is not only suitec to low fluid pressures but also to higher flowing pressures, with a relative error of 5.64% Predict-ion shows that, according to the formula, when fluid pressure is lower than a certain value, production will decrease with it. The conclusion has important guiding meaning for increasing fluid delivery in stable Product-ion field tests at the late period of high water cut stage.