三类油层压裂驱油技术设计及效果研究

Design and Effect of Fracture-flooding in Class III Oil Reservoirs

何金钢 王洪卫

HE Jingang WANG Hongwei

中国石油大庆油田有限责任公司第一采油厂, 黑龙江 大庆 163000

No.1 Oil Production Plant, Daqing Oilfield Company Limited, PetroChina, Daqing, Heilongjiang 163000, China

大庆油田三类油层的高效开发技术研究是保障油田高产稳产的关键。针对萨中开发区三类油层砂体类型多、储层物性差，在开发过程中采出程度低、剩余油零散、吸附量大，化学驱难度大等问题，提出了"压裂驱油"技术，通过压裂造长缝形成高速通道，将高效驱油剂经裂缝快速送至剩余油富集部位，边压裂造缝边沿程上下滤失，减少化学剂与地层之间接触时间和接触距离，以降低注入过程中化学剂性能的沿程损失，提高利用效率，增强驱油效果。现场试验表明，三类油层工艺上能够实现压裂驱油注入，且试注井组见到驱油效果，可推广应用于萨中开发区萨葡三类和高台子三类油层，作为增产增注技术快速挖潜零散井点剩余油。

The efficient exploitation of the Class Ⅲ reservoir in the Daqing Oilfield is necessary for realizing a high and stable yield of oil. To solve the problems encountered in the Sazhong Development Zone, such as the multiple sand body types present, poor physical properties of the reservoir, low recovery, scattered distribution of remaining oil, high adsorption, and the difficulty in chemical flooding during oil extraction, a "fracturing flooding" technique is proposed. In this method, a high-speed channel is formed by a long fracture to quickly deliver high-efficiency oil displacement agents to sites with enriched remaining oil. Filtration loss happens along the way as the channel is formed by fracturing to reduce the contact duration and distance between the chemical agents and strata. Hence, the decrease in the effectiveness of the chemical agents during the injection process is minimized, and their usage efficiency and flooding effect are improved. Field tests show that the injection of oil displacement agents through a fracture is technically possible for the Class Ⅲ reservoir. Satisfactory flooding results are seen in the wells where trial injections are performed. This method could be applied to Sapu Class Ⅲ reservoir and Gaotaizi Class Ⅲ reservoir of the Sazhong Development Zone to realize production and injection enhancement for the rapid tapping of scattered remaining oil in the wells.

10.11885/j.issn.1674-5086.2017.12.25.03