低渗透砂岩油藏水锁损害影响因素研究

Study on Influence Factors of Water Block Damage in Low-permeability Sandstone Reservoirs

综合研究各类因素对水锁损害的影响程度,对低渗透砂岩油藏的水驱开发极为重要。以轮古7井区为例,在定性分析水锁损害影响因素的基础上,确定水锁损害的主要影响因素。然后用灰色关联分析法和相关分析法定量地分析各影响因素,并求出各因素的关联度和权重系数,最后通过室内评价实验对理论结果进行验证。研究表明:两种定量分析方法得到的结果一致,并通过室内评价实验验证了研究结果的正确性。

Comprehensive study of various influencing factors of water block damage is very important for water flooding development of low-permeability sandstone reservoirs. In this paper, taking Lungu-7 well block as an example, influencing factors of water block damage were qualitatively analyzed, the main reasons of water block damage were determined. Then quantitative analysis of these factors was carried out by grey relational analysis and relative comparison method to determine the degree of association and weight of every factors. Finally, the theoretical results were verified through laboratory experiments. The results show that the two quantitative evaluation results are consistent with laboratory experiment results.