海上油田水平井产能校正系数计算方法

CALCULATING METHOD OF THE PRODUCTIVITY CORRECTING COEFFICIENT FOR THE HORIZONTAL WELLS ON OFFSHORE OILFIELD

海上油田单井投产一段时间产能评价校正系数的取值多为经验值,预测结果不准确.引入无因次采油指数的概念,绘制了水平井不稳定渗流无因次采油指数曲线,利用面积积分法对产能校正系数进行求解,得到了海上油田水平井投产后不同时期的产能校正系数,并分析了不同因素对产能校正系数的影响.海上某油田2口水平井的实例计算结果表明,以此方法计算的校正系数乘以DST测试产能,得到的产能数值更准确.此方法为海上油田水平井的产能预测提供了理论依据.

When putting into production for a period of time for an offshore oilfield, the value seeking for the correcting coefficient of the productivity evaluation is often obtained according to the experiences, so the predicted result is not accurate. By introducing the concept of the non-dimensional oil productivity index, the index curves of the horizontal wells with transient flow are mapped, and moreover the correcting coefficient of the productivity is resolved by means of the area integrating method, and then the coefficients for different putting-into-production periods of the offshore oilfield horizontal wells are got, finally the influencing factors on the coefficients are analyzed. The case calculated results of two offshore horizontal oil wells show that the computed productivity values by the calculated coefficient by the method are more accurate when multiplied by the tested productivity value by DST. The method has provided the theoretical evidence for the productivity prediction of offshore horizontal oil wells.