石油钻采工艺2025，Vol.47Issue(2)：245-254,10.DOI:10.13639/j.odpt.202501033
夹层型页岩油注CO2吞吐提高采收率动用机理及埋存前景
Production mechanism of enhanced oil recovery by CO2 huff and puff and storage prospect in interbedded shale oil reservoirs
摘要
Abstract
To address the challenges of low formation pressure,rapid decline in horizontal wells,and ineffective water injection in the Triassic Chang 7 shale oil reservoir of Ordos Basin,this study investigates the microscopic mechanisms of gas injection for enhanced oil recovery(EOR)and develops efficient development methods for continental shale oil.The study integrates CO2 huff and puff experiments with nuclear magnetic resonance(NMR)technology to quantitatively characterize oil recovery efficiency and residual oil distribution under varying injection durations.Physical simulation experiments replicate in-situ CO2 injection processes to analyze hydrocarbon fractionation and the impact of prior water injection on gas injection efficacy.Field trials are conducted in horizontal wells within the X233 well block of Longdong area,supported by numerical simulations to optimize gas injection parameters.NMR results indicate that CO2 initially mobilizes oil from large pores,with small-pore oil gradually activated over time,showing weak correlation with porosity and permeability.Physical simulation demonstrates that with increasing huff and puff cycles,crude oil components exhibit distinct fractionation characteristics,where light hydrocarbons are preferentially extracted and heavy hydrocarbons gradually accumulate.Field applications demonstrate that optimized synchronous huff and puff enhances single-well estimated ultimate recovery(EUR)by 50.4%,elevates formation pressure by 25%～29%,confirming the effectiveness of gas injection in low-pressure shale oil reservoirs.CO2 huff and puff enhances shale oil recovery through selective extraction of light hydrocarbons and pore-pressure synergy.The synchronous injection mode is economically viable but requires avoiding pre-water injection interference.This study provides theoretical and technical foundations for the efficient development of continental low-pressure shale oil reservoirs.关键词
鄂尔多斯盆地/页岩油/提高采收率/CO2吞吐/核磁共振/物理模拟/数值模拟/产油及埋存Key words
Ordos basin/shale Oil/EOR/carbon dioxide huff and puff/nuclear magnetic resonance/physical simulation/numerical simulation/oil production and storage分类
能源科技引用本文复制引用
雷启鸿,麻书玮,张丽,焦精勤,熊维亮,何右安,李海波..夹层型页岩油注CO2吞吐提高采收率动用机理及埋存前景[J].石油钻采工艺,2025,47(2):245-254,10.基金项目
甘肃省联合科研基金重大项目"页岩油水平井稳产技术研究"(编号:24JRRM012) （编号:24JRRM012）
甘肃省重点研发计划-工业类项目"庆城油田长7页岩油甜点优选技术研究及应用"(编号:23YFGM0002). （编号:23YFGM0002）
