海上断块油田定向井初期产能评价方法分析
Evaluation Methods for Initial Productivity of Directional Wells in Offshore Fault Block Oilfields
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摘要: 为确定DST测试法评价海上断块油田产能时的测试时间校正系数和边界校正系数大小,建立了不同边界断层定向井不稳定产能方程,并对其进行无因次化,获得了不同断层条件下油井无因次采油指数随时间变化的曲线,得到测试时间校正系数图版和不同断层距离及夹角的校正系数图版。机理分析表明,断块油田定向井产能综合校正系数为0.60~0.80,并且校正系数随测试时间不同而不同。海上2口生产井实例计算分析结果表明,利用理论图版分析各井产能综合校正系数与实际生产动态数据验证综合校正系数基本吻合,验证了产能综合校正系数图版的可靠性。研究结果表明,不同边界类型定向井DST测试产能校正系数与测试时间、边界距离呈指数递减趋势,可利用产能综合校正系数图版为海上短时DST测试法评价产能确定准确的综合校正系数。Abstract: To quantitatively determine the testing time and boundary correction factor of productivity evaluation with DSTs in oilfields with faults, unstable productivity equations were developed under different boundary conditions, and dimensionless oil production index curves were obtained. esting time and its correction factor under different fault distance and angle were derived.It was demonstrated that the productivity correction factor was roughly between 0.60-0.80 in this oilfield, and the correction factor varied over testing time.The example results from two production wells demonstrated that the theoretical analysis productivity correction factor was verified by the actual production dynamic data. Further it also verified the reliability of productivity correction factor charts.It concluded that the productivity correction factor under different boundary conditions decreased with testing time and boundary distance.Operators can use charts with productivity correction coefficients to determine the correction factor for offshore oil well productivity evaluation.
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