利用地层压力测试资料识别自由水面的方法

Method of identifying free water level using formation pressure test data

地层压力测试对了解地层特性具有重要意义,特别是在确定油水界面、划分压力系统和确定流体密度等方面尤为重要。由于获取地层压力资料和资料处理方法上的不确定性,解释分析测试压力资料时经常出现较大的误差。利用地层压力测试的RFT资料,基于水层压力测试数据,采用压力差异法对油藏压力测试数据进行折算处理,可以快速、准确地确定自由水面;同时,采用深度面分析法,利用油水压力数据之间的相互关系,通过数学计算和概率分析确定的自由水面精度也较高。实例应用表明,计算结果与实际结果符合程度较好,与常规方法相比精度较高,研究成果对油田开发具有一定的指导意义。

Formation pressure test has important significance to understand the reservoir properties.Especially it is so in oil-water interface identification,pressure system division and fluid density determination.Due to the uncertainties in data acquisition and interpretation methods,there are great errors in the interpretation and analysis of formation pressure test data.Based on the RFT data of formation pressure test and the pressure test data of water formation,the pressure test data of oil reservoir are converted and processed to quickly and exactly identify the free water level using pressure difference method.Through the analysis method of depth surface and using the interrelation of oil-water pressure data,the precision of free water level which is determined by mathematics calculation and probability analysis is high.Practical application shows that the agreement between the calculated results and actual result is good and the precision is high compared with the conventional method.The research results have guiding significance to oilfield development.