低渗透砂岩油藏低效循环形成时机研究

根据低效循环形成后油水井在开发过程中的表现特征，结合实际区块中油水井井史数据，选取注水强度突进程度、水油比增长速率、采液强度上升指数、注采压差递减速度等作为判定低效循环形成时机所需的动态指标，运用层次分析法求取各指标权重，并应用模糊综合评判法建立了低效循环形成时机的评判模型。应用该模型对江苏油田高6断块油藏实际生产油水井进行判别，结果表明：所建模型准确可靠，符合矿场实际，具有一定的应用前景。

Forming time of low efficient circulation in low permeability oil reservoir

According to the performance of oil and water wells after low efficient circulation formed, combined with the historical data in actual block, dashing degree of flooding intensity, growing rate of water-oil ratio, ascending factor of liquid production per unit thickness and declining fraction of flooding pressure difference are selected as the dynamic indexes. Then the weights of all indexes are calculated by applying analytical hierarchy process and the judging model for the forming time of low efficient circulation has been established by using the fuzzy integrated evaluation. Finally, the model is applied to distinguish the oil wells from water wells in Gao6 Fault Block reservoir of Jiangsu Oilfield. The results show that the established model is dependable, which is in accordance with the fact and has a certain application prospect.