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涠洲A油田W4油藏为实施过程中发现的新油藏,开发初期为近衰竭式开发,地层脱气严重。为改善其开发效果,结合地质油藏特征与区域气资源情况,采取了注气提高采收率技术。以涠西南油田群外输气与地层原油的互溶性膨胀试验和多次接触过程PVT实验数据为基础,结合PVT物性参数及相态特征的模拟计算,分析了注伴生气膨胀和多次接触实验特征,结果表明,工区注气驱为非混相驱。该区块在2007年11月开始注气后,地层压力回升,产油大幅度提高,预测该区块采收率可达25%,注气开发效果显著。
The W4 reservoir in Weizhou A field was a new oil reservoir discovered during the implementation, and was developed near-depletion in the early stage of development. The formation degassing is serious. In order to improve its development effect, combined with the characteristics of geological reservoirs and regional gas resources, take gas injection to improve oil recovery technology. Based on the PVT experimental data and the PVT experimental data of gas transmission and formation crude oil in West Southwest Oilfield and the PVT physical parameters and phase characteristics, the gas injection expansion and multiple contact experiments The results show that gas injection in the work area is non-miscible flooding. After the gas injection started in November 2007, the formation pressure rose and the oil production increased greatly. It is predicted that the recovery rate of this block will reach 25% and the effect of gas injection development will be remarkable.