稠油油藏蒸汽泡沫调驱物理模拟实验——以吉林油田扶北3区块为例

针对稠油油藏蒸汽驱过程中压力维持困难和汽窜导致热效率下降等问题,开展了蒸汽泡沫调驱物理模拟实验.根据吉林油田扶北3区块的地质特点,设计了非均质双管并联驱替模型,将不同调驱方式下的驱油效率和分流量进行了对比.结果表明,在蒸汽混注泡沫调驱的过程中,注入发泡剂或泡沫能在一定程度上封堵高渗透管,启动低渗透管内的剩余油,其驱油效果好于其他驱替方式；蒸汽混注高温气体调驱的驱油效果略好于蒸汽驱,仅提高采收率约1％ ～ 3％.此外,泡沫对双管模型进行了有效的调整分流,使高渗透管和低渗透管的产液量趋于均匀,表明泡沫驱符合非均质地层的驱替要求.综合比较认为蒸汽混注混合气泡沫调驱适用于扶北3区块,其综合驱油效率可达54.8％,比单纯蒸汽驱提高30.7％.

Physical modeling research of profile control and displacement by steam foam flooding in heavy oil reservoir-case of Fubei 3 block in Jilin oilfield

Aiming at the difficulty of pressure maintaining and the low performance caused by steam channeling in heavy oil reservoirs,the physical modeling of profile control and displacement by steam foam flooding was studied in this paper. In order to contrast the oil displacement efficiency and factional flow of different flooding patterns including foam assisted steam flooding and high temperature gas assisted steam flooding, a dual sand-packed tube is designed to accomplish the experiments according to the geological characteristics. The results indicate that the foaming agent or foam, whose oil displacement performance is better than the other flooding patterns,can not only plug the tube with high permeability but also start the tube with low permeability in the model. High temperature gas assisted steam flooding has a slightly better oil displacement effect contrasted with pure steam flooding, and only increases oil recovery by about 1-3 percent. Moreover, the foam can control the flow direction to make the liquid producing capacity of the dual sand-packed tube uniform, this result shows that the foam flooding is suitable for the heterogeneous formation. The contrast in oil displacement performance of different flooding patterns shows that the mixed gas-foam flooding is the best flooding pattern for Fubei 3 block, whose combined oil displacement efficiency reaches 54.8%, which is enhanced by 30.7% contrasted with pure steam flooding.