Bibliographic Details
| Title: |
超长延缓交联体系性能评价及作用机理. |
| Alternate Title: |
Research on performance evaluation and mechanism of an ultra-long delayed crosslinking system. |
| Authors: |
张云宝1,2,3 zhangyb1000@163.com, 吴潇洋2,3 17853919649@163.com, 葛嵩4, 曲萧萧5, 王劲草2,3, 韩瑞林2,3 |
| Source: |
Chemical Engineering of Oil & Gas / Shi You Yu Tian Ran Qi Hua Gong. Jun2026, Vol. 55 Issue 3, p109-118. 10p. |
| Subject Terms: |
*Crosslinking (Polymerization), *Enhanced oil recovery, *Permeability, *Oil field flooding, *Thermal stability, *Gelation, *Salinity |
| Abstract (English): |
Objective To address the issues of high water cut, high recovery factor, and the difficulty in effectively using of residual oil in remote wellbore zones caused by long-term waterflooding in Bohai Oilfield, an ultra-long delayed crosslinking system was proposed. This system delays the crosslinking reaction time and enhances the deep fluid diversion, thereby expanding the swept volume of profile control and flooding, mobilizing residual oil in remote wellbore zones, and significantly improving waterflooding development efficiency. Method Scanning electron microscopy, a six-speed rotational viscometer, and physical simulation experiments were used to analyze the gel-forming properties, temperature and salt resistance, injectivity and plugging properties of the ultra-long delayed crosslinking system, as well as its effect of enhanced oil recovery. Result The ultra-long delayed crosslinking system began gelling after 15 days at 55 and 65 ℃, exhibiting a long gelling time that effectively plugged the high permeability channel and used the residual oil in the remote wellbore zone. The gelling time accelerated sharply at 75 ℃, and the viscosity increased with increasing temperature and salinity. The injection and plugging experiments showed that as the concentrations of polymer and crosslinker increased, the injection pressure gradually increased, reaching a maximum of only 0.09 MPa, indicating good injectivity. The plugging rate remained above 84%, demonstrating good plugging performance. Microscopic oil displacement experiments showed that after injecting the ultra-long delayed crosslinking system, the diversion rate of the high permeability layer decreased significantly, while that of the low permeability layer increased markedly, leading to a substantial improvement in oil recovery. Conclusion The ultra-long delayed crosslinking system can effectively improve waterflooding performance and increase the oil utilization degree of residual oil in remote wellbore zones. The system showed good gel-forming performance and plugging effectiveness in high-temperature and high-salinity environments, making it suitable for long-term plugging requirements under complex reservoir conditions. By optimizing injection parameters, the system can significantly improve waterflooding efficiency. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
目的 针对渤海油田长期注水开发导致的高含水率、高采出程度、远井地带剩余油难以有效动用等问题, 提出使 用超长延缓交联体系延缓交联反应时间, 增强深部液流转向能力, 扩大调驱波及体积, 动用远井地带剩余油, 提高水驱开 发效果。方法 利用扫描电镜测试、六速旋转黏度计以及物理模拟实验针对超长延缓交联体系的成胶性能、耐温耐盐性、注 入性、封堵性和提高采收率效果进行分析。结果 超长延缓交联体系在 55 和 65 ℃ 下 15 天开始成胶, 成胶时间长, 能够有 效封堵高渗透通道, 动用远井地带剩余油; 在 75 ℃ 下成胶时间急剧缩短, 且黏度随温度和矿化度的升高而增大。注入性 和封堵性实验显示, 随着聚合物和交联剂含量的增加, 注入压力逐渐增大 (最高为 0.09 MPa), 注入性较好, 封堵率保持在 84% 以上, 具有良好的封堵效果。微观驱油实验显示, 注入超长延缓交联体系后, 高渗层分流率显著降低, 低渗层分流率 明显提高, 采收率显著提高。结论 超长延缓交联体系能够有效改善水驱开发效果, 提高远井地带剩余油动用程度。该体 系在高温高盐环境下表现出良好的成胶性能和封堵效果, 适用于复杂油藏条件的长期封堵需求。通过优化注入参数, 该 体系能够显著提高水驱开发效果。 [ABSTRACT FROM AUTHOR] |
| Database: |
Energy & Power Source |
