前置CO2混合压裂裂缝扩展与波及范围数值模拟研究

Numerical simulation study on fracture propagation and ripple range of pre-CO2 hybrid fracturing

孙晓 ¹罗攀 ¹汤积仁 ²郭兴 ¹贺沛 ¹穆景福 ¹张磊¹

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作者信息

1. 陕西延长石油(集团)有限责任公司研究院,西安 710065;陕西省二氧化碳封存与提高采收率重点实验室,西安 710075
2. 重庆大学,重庆 400044
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摘要

为了明确前置CO2混合压裂的裂缝扩展行为和波及范围,以预测CO2多级复合压裂改造规模,优化工艺参数,开展了不同液量及排量下纯CO2和混合压裂的裂缝形态与波及范围数值模拟研究.结果表明,CO2注入的扩散范围随着注入总量的增加而增大;CO2持续注入可以促进裂缝的扩展,较低的注入排量和长时间的注入周期有利于CO2持续扩散至地层,大排量的注入和短的注入周期有利于裂缝的持续扩散;混合压裂可以有效促进裂缝的持续扩展.研究成果对CO2混合压裂参数优化具有一定指导意义.

Abstract

In order to predict the scale of CO2 multi-stage hybrid fracturing and optimize the process parameters,numerical simulation of the fracture morphologies and swept ranges of pure CO2 and mixed fracturing under different liquid volumes and displacements were studied to fracture propagation and swept ranges of pre-CO2 hybrid fracturing.The results show that the diffusion ranges of CO2 injected increase with the increase of the injection amount;continuous CO2 injection can promote the propagation of fractures,low injection displacement and long injection period are conducive to the continuous diffusion of CO2 into the formation,and large displacement injection and short injection period are conducive to the fracture propagation.Hybrid fracturing can effectively promote continuous fracture propagation.The research results have a certain guiding significance for the optimization of CO2 hybrid fracturing parameters.

关键词

CO2压裂/混合压裂/波及范围/裂缝扩展/改造体积/数值模拟

Key words

CO2 fracturing/mixed fracturing/spread range/fracture propagation/SRV/numerical simulation

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出版年

2024

非常规油气

ISSN：

段落导航