海上低温油藏纳米复合型高效凝胶体系的优化及性能评价
Optimization and performance evaluation of nano-composite high-efficiency gel system for offshore low-temperature reservoirs
李立冬 1苏程 2王硕 2徐静思 3王新铭3
作者信息
- 1. 中海油田服务股份有限公司上海分公司,上海 200335
- 2. 中海油田服务股份有限公司油田生产事业部,天津 300459
- 3. 中国石油大学(华东)石油工程学院,山东青岛 266580
- 折叠
摘要
目前,海上油田受沉积环境、疏松岩石结构和强注强采开发模式等因素影响,油藏储层深部窜流通道发育较多,同时常规凝胶调剖体系在低温油藏改善过程中存在成胶困难、强度低和封堵效果欠佳的问题,无法达到封堵要求.为此,本文针对海上低温油藏特性,通过筛选Y型聚合物为凝胶主剂,添加纳米型促交剂和引发剂与水溶性酚醛树脂复合交联来制得低温油藏纳米复合型高效凝胶体系.室内通过正交实验来探究水溶性酚醛树脂、纳米型促交剂以及引发剂浓度对Y-1 凝胶体系的影响规律,通过SEM、耐盐实验和岩心封堵率实验等表征手段对纳米复合型高效凝胶体系进行性能评测.实验结果表明,该体系成胶时间可控、成胶强度可调和老化稳定性强,在低温条件下,Y-1 凝胶体系呈现颗粒物堆积型微观结构,具有结构强度高和稳定性好的特点,岩心封堵率实验表现出良好的封堵效果.
Abstract
At present,the offshore oilfield is affected by factors such as sedimentary envi-ronment,loose rock structure,and strong injection and strong production development mode.There are many deep channeling channels in reservoir.Concurrently,in the process of low-temperature reservoir improvement,the conventional gel profile control system has the prob-lems of difficult gel formation,low strength and poor plugging effect,which cannot meet the plugging requirements.Therefore,according to the characteristics of offshore low-tempera-ture reservoirs,Y-type polymers were screened as the main agent,and nano-type cross-junction promoters and initiator were added on the basis of cross-linking of water-soluble phenolic resin to obtain low-temperature reservoirs nano-composite high-efficiency gels system.The effects of water-soluble phenolic resin,nano-type cross-promotion and initiator concentration on the Y-1 gel system were determined by orthogonal experiments,and the performance of the nano-composite high-efficiency gel system was evaluated by SEM,salt tolerance experiment and core plugging ratio experiment.The research results indicate that the characteristics of controllable gelatinization time,adjustable gelatinization strength and strong aging stability.Under low-temperature conditions,the Y-1 gel system exhibited a particle-packing microstructure,which had the characteristics of high strength and good stability of the skeleton structure,and the core experiment found that the plugging effect was good.
关键词
低温油藏/纳米复合型高效凝胶/性能评价/海上油田Key words
low-temperature reservoirs/nano-composite high-efficiency gels/performance evaluation/offshore oilfields引用本文复制引用
基金项目
中国海洋石油集团有限公司科技课题(2022-KJYFPT-001)
出版年
2024
NETL
NSTL
维普
万方数据