松滋油田注气物理模拟实验研究

Research on Gas Injection Physical Simulation Experiment in Songzi Oilfield

松滋油田属特低渗透油藏,由于注水困难,地层能量得不到有效补充,存在"注不进、采不出"的现象。在室内,应用闪蒸法测试在地层条件下二氧化碳和氮气在原油中的溶解度,弄清楚原油在饱和二氧化碳、氮气后粘度的下降幅度。以此为基础,开展氮气驱、水驱、氮气吞吐和二氧化碳吞吐等不同方式的开发效果研究,发现注水驱替的采出程度要好于注气驱替效果,注水驱替的注入压力要远大于注气驱替时的压力,注二氧化碳吞吐的效果要好于注氮气吞吐。

Songzi Oilfield belongs to ultra--low permeability reservoir. Due to water injection trouble, it cannot get effective supplement of stratum energy, causing ＂no injection and no extraction＂. Flash method is used indoors to test what solubility carbon dioxide and nitrogen have under formation condition and make clear falling range of crude viscosity while it is saturated with carbon dioxide and nitrogen. On this basis, this paper studies different development effects with different development measures such as nitrogen flooding, water flooding, nitrogen stimulation and CO2 huff and puff and determines that water flooding is better than gas injection for oil recovery, that water flooding pressure is much bigger than gas injection pressure and that CO2 huff and puff has better result than nitrogen stimulation.