水驱曲线法在高含水油田上市储量评估中的应用

Application of Waterflooding Curve in the Listed Reserve Estimation of High Water-Cur Oilfield

指数递减法是评估上市储量的一种重要方法,然而随着油田进入高含水期,油井产量的自然递减逐步减缓,应用恒定递减率的指数递减法进行储量评估,与油田实际生产规律不符。为确定一种合理、准确评估高含水油田上市储量的方法,通过对水驱曲线法评估要点分析,以渤海Q油田为例,完成美国证券交易委员会(SEC)规则下水驱曲线法对未来储量的评估,并结合油田生产规律进行了评估方法的合理性论证。研究表明,水驱曲线法评估高含水油田上市储量更加合理、可靠,其产量递减规律更符合油田实际生产规律,评估结果更接近油田实际产量。首次在渤海Q油田应用水驱曲线法评估上市储量,Q油田上市净储量增加126. 88×10~4t(增加16. 5%),实现了上市储量的"正增长"。建议将水驱曲线法在高含水油田上市储量评估中进行推广应用,以期更好地完成高含水油田上市储量评估工作。

The exponential decline analysis is a crucial method for the listed reserve estimation. However,the natural production decline for the oil well gradually slows down as the oilfield development steps into high water-cut stage. The reserve estimation with exponential decline model and constant decline rate is usually inconsistent with the field production performance. The key elements of waterflooding curve was analyzed to identify a reasonable and accurate method to estimate the listed reserve of high water-cut oilfield. The Bohai Oilfield was taken to complete the future reserve estimation with waterflooding curve according to the US Securities and Exchange Commission rules. The field production performance was considered to demonstrate the validity of this reserve estimation method.Research indicates that the waterflooding curve method can provide a more reasonable and reliable listed reserve estimation for the high water-cut oilfield. The production decline performance is more consistent with the field production performance,which could supply a more reliable reserve estimation. The waterflooding curve method was firstly applied to estimate the listed reserve of Bohai Q Oilfield. The net listed reserve of the Q Oilfield was increased by 126.88×10~4 t( increased by 16. 5%),realizing the"positive growth"of listed reserve. The waterflooding curve method is suggested to be promoted and applied in the listed reserve estimation of high water-cut oilfield,which could improve the listed reserve estimation of high water-cut oilfield.