鄂尔多斯盆地坪桥南长6油藏注水见效合理参数分析

针对鄂尔多斯盆地杏子川油田坪桥南区长6低渗透油藏注水见效率低、部分油井含水上升过快的问题,研究了注水见效时间规律,提出了注水参数优化的方法.通过统计分析结合数值模拟手段,分析单一因素对见效时间的影响,探索注水见效时间和合理注水强度,形成了预测见效时间及合理注水强度的图版.结果 表明,坪桥南区长6油藏转注后高强度注水的见效时间为5-15个月;见效后温和注水合理水强度范围为1.0～2.0 m3/(d·m).按该方法对单井配注优化后,水驱效果明显提高.

Effectiveness analysis and Reasonable parameters of Water flooding in South Pingqiao Chang 6 Reservoir in Ordos Basin

The water flooding effect of reservoir in South Pingqiao Chang 6 low permeability reservoir of Xingzichuan oilfield in ordos Basin is poor, and the water cut of some oil wells rises too fast. To solve the above problem, the law of effective time of water flooding was analysed, and a method of parameters optimization was proposed. By means of statistical analysis and numerical simulation, influence of single factor on the effective time was analysed, effective time of water flooding was explored to form the chart for being predicting, and reasonable water flooding intensity was also explored to form the chart for optimizing water flooding parameters. The results show that effective time of high intensity water flooding is 5 to 15 months, and the reasonable range of water flooding intensity is 1.0 to 2.0 m3/(d·m) after the water flooding is effective. Finally, the water flooding effect is obviously improved after optimizing single well according to the chart.