稠油油藏注蒸汽开采对岩石层的伤害研究

Study on the damage of heavy oil reservoir rock by steam injection

稠油油藏注蒸汽开采过程中,储层岩石因处在冷热交替的环境下而容易出现颗粒的脱落、运移和堵塞,对储层岩石更易造成伤害,影响油井正常生产。用自行设计的新实验方法对稠油油藏注蒸汽时对储油层岩石的伤害进行了评价,确定了伤害的程度和引起伤害的主要因素,找到了岩石层污染的注入速度和放喷界限。对蒸汽驱的岩石孔隙结构变化进行了分形研究,从量的角度对蒸汽驱对油层岩石的伤害进行了评价,对实际生产具有一定的指导意义。

In the process of heavy oil recovery by steam injection,the grain particles of reservoir rock tend to fall off,move and block up due to the alternation of heat and cold,thus affecting normal oil production.A new ex- perimental method is designed to evaluate the damage to reservoir rock during steam injection,to determine the damage degree and the main factors causing the damage,and to define the injection rate and the bean limit cau- sing reservoir contamination.Fractal study is conducted for the change of pore structure during steam flooding, and the reservoir damage is evaluated quantitatively.