低渗透油藏烟道气驱流体相态评价

EVALUATION OF FLUIDS PHASE DURING FLUE GAS INJECTION IN LOW PERMEABILITY RESERVOIRS

以大庆低渗透油田州2区块为研究对象,进行了井流物组成分析、原始相态测定、地层原油注烟道气膨胀PVT实验以及烟道气驱细管实验等评价研究.结果表明,州2区块地层原油属普通黑油,膨胀能力不强 随着注入烟道气比例的增大,地层油变轻,膨胀能力增强 烟道气注入油藏难以达到混相,表现为非混相驱替特征.烟道气驱技术作为一种储备,为开发大庆外围低渗透油田提供了一种技术手段.

Take Block Zhou2 in Daqing low permeability oilfields as the research target, the study on composition analysis of the fluids in the well, the original phase state measurement, PVT tests for oil swelling with flue gas injection into the formation, slim tests for flue gas injection has been carried out. The research results indicate, the formation oil in Block Zhou2 belongs to ordinary oil, and the swelling capability is not strong; with more and more flue gas being injected, the formation oil density will become low, and the swelling capability will become high; it is difficult to be miscible for flue gas injection, and it is featured by immiscible characteristics. Flue gas injection can be an alternative technology for the development of Daqing periferal low permeability oilfields.