基于阶段生产数据的IPR曲线类型及意义

摘要

Traditional IPR curve test is characterized by severe influence on time-rate, less curve number, poor applicability, etc.A new method is proposed to gain IPR curve based on periodic production data and 5-category IPR curves are summarized, namely negative-correlation, near-horizontal, positive-correlation, near-vertical, cluster.Research indicates that negative-correlation IPR curve presents relatively stable formation pressure and a specific relationship between daily liquid production and bottom-hole flowing pressure.Near-horizontal and positive-correlation IPR curves indicate change in periodic formation pressure and the daily well liquid production is dependent on both static pressure and bottom-hole flowing pressure.Near-vertical IPR curve shows a mismatching between lifting capability and liquid production capacity and the lifting capacity is less than the theoretical formation liquid production capacity.Cluster IPR curve reveals a stable periodic production without specific relationship between daily liquid production and bottom-hole flowing pressure.The liquid production capacity of production well, formation pressure trend, lifting condition can be determined according to distribution of production data in IPR, which could provide certain guidance for injection-production adjustment.%针对传统IPR曲线测试影响时率、曲线数量少、矿场应用范围小等问题,提出了利用油井阶段生产数据制作IPR曲线的方法,并归纳出了负相关型、近水平型、正相关型、近垂直型、簇型等5种IPR曲线类型.研究表明:负相关型IPR曲线反映井区地层压力相对稳定,日产液量与井底流压关系明确;近水平型、正相关型IPR曲线反映阶段地层压力存在变化,日产液量受静压、流压变化共同影响;近垂直型IPR曲线反映井下举升能力小于地层理论产液能力,举升工况与产液能力不匹配;簇型IPR曲线反映阶段生产状况稳定,但日产液量与井底流压的相关性不明.结合生产数据点位于IPR曲线的位置,可对油井产液能力、地层压力变化趋势、举升工况合理性做出判断,指导井区注采调整.