稠油蒸汽吞吐前后储层参数变化规律及机理研究

Law and mechanism of reservoir parameters change both before and after steam stimulation in heavy oil reservoir

吴迎彰¹ 陈科贵¹ 木合塔尔² 李军民² 张利锋²

西南石油大学资源与环境学院，四川 成都 610500 中国石油新疆油田公司勘探开发研究院，新疆 克拉玛依 834000

College of Resources and Environment, Southwest Petroleum University, Chengdu 610500, China Research Institute of Petroleum Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay 834000, China

为了探索稠油油藏蒸汽吞吐前后储层微观变化规律，指导油田注蒸汽开发，以探井、检查井的岩心分析数据为基础，研究了红浅1井区稠油蒸汽吞吐前后储层参数变化规律。总体表明：蒸汽吞吐水淹后经改造的次生孔隙发育，出现大孔隙或超大孔隙；孔隙直径与喉道在不同的岩性下变化不同，加剧了储层微观非均质性；近井筒附近，岩石骨架、矿物溶解量最大，微粒迁移活跃，孔喉半径增加，储层物性明显变好；远离井筒地带，矿物溶解作用减弱，蒙脱石的膨胀性能剧增、碳酸盐沉淀结垢堵塞孔喉，储层物性变差；储层润湿性由亲油向亲水性方向转变。

In order to explore the microscopic change laws of reservoir both before and after the cyclic steam stimulation of heavy oil reservoir to guide the oilfield production and development, the change laws of reservoir parameter both before and after steam stimulation in the heavy oil reservoir of Well Hongqian 1 area are analyzed on the basis of core data of exploratory well and inspection well. The research result indicates that the transformation of secondary porosity is developed and large pores or ultra-large pores are found after steam stimulation. The changes of pore diameter and throat are different at different lithologies, which intensify the microscopic reservoir heterogeneity. Nearly near wellbore, the amount of rock skeleton and mineral dissolution is the largest, the particles migrate actively, pore throat radius is increased and the reservoir properties are significantly changed for the better. Away from the wellbore zone, mineral dissolution is weakened, sharp increase of swelling properties of montmorillonite and carbonate precipitation plug the pore throats, so the reservoir property becomes poor. The reservoir wettability is changed towards water wetting from oil wetting.

10.6056/dkyqt2012z1002