致密油气窜波及控制体系适用性评价
Applicability Evaluation of Tight Oil Reservoir Gas Channeling and Sweep Control System
李俊键 1席艺霖 2张媌 1臧传贞3
作者信息
- 1. 中国石油大学(北京)石油工程学院,北京昌平 102249
- 2. 中海油田服务股份有限公司油田生产事业部,天津塘沽 300459
- 3. 中国石油新疆油田分公司,新疆克拉玛依 834000
- 折叠
摘要
我国致密油藏分布广泛,储量占比大,开发潜力巨大.此类油藏目前注气开发较多,基质渗透率、孔隙度均较低,油气流动通道主要为裂缝.但油藏裂缝跨尺度发育,受储层非均质性和黏性指进的影响,注气提高采收率技术受限,在裂缝及高渗条带存在时易形成气窜,对地层能量补充带来了诸多问题.选择泡沫和CO2响应性凝胶配制气窜波及控制体系,并通过物理实验模拟评价其性能和在致密油藏的适用性;利用商业数值模拟软件表征CO2注气吞吐及地下成胶反应.经过对国内某致密油藏的数值模拟研究,证明CO2响应性凝胶对注气吞吐有明显的增产效果,采收率增加3.1%,验证了CO2响应性凝胶体系在致密油藏开发中具有良好的应用前景.
Abstract
Tight oil reservoirs are widely distributed in China,with a large proportion of reserves and great development potential.These reservoirs have low matrix permeability and porosity,with fractures acting as main oil and gas flow channels,and gas injection is often used to recover such reservoirs.However,due to the cross-scale development of reservoir fractures and the influence of reservoir heterogeneity and viscous fingering,the technology of gas injection to improve oil recovery has limits.Gas channeling can easily occur in the presence of fractures and high permeability bands,causing many issues related to the energy supplement of formation.In this pa-per,foam and CO2-responsive gel were selected to prepare the gas channeling and sweep control system,and their performance and ap-plicability in tight oil reservoirs were evaluated by physical experiment simulation.Commercial numerical simulation software was used to characterize CO2 huff-n-puff and underground gelling reaction.Through the numerical simulation of a tight oil reservoir in China,it is proved that the CO2-responsive gel has an obvious stimulation effect during huff-n-puff treatment,resulting in an increase in recov-ery rate by 3.1%.This research validates the promising application prospects of the CO2-responsive gel system in the development of tight oil reservoirs.
关键词
致密油藏/气窜/裂缝/CO2响应性凝胶/提高采收率/注气吞吐Key words
tight oil reservoir/gas channeling/fracture/CO2-responsive gel/enhanced oil recovery/huff-n-puff引用本文复制引用
基金项目
国家自然科学基金面上项目(52374055)
出版年
2024
NETL
NSTL
万方数据