超临界CO_(2)压裂对储层渗透率的适应性研究  

Study on Adaptability of Supercritical CO_(2)Fracturing on Reservoir Permeability

作　　者：杨兵 黄海[2] 王海柱[3] 任倩倩 乔瑞宏 王斌[3] 樊旭浩 张国新 YANG Bing;HUANG Hai;WANG Haizhu;REN Qianqian;QIAO Ruihong;WANG Bin;FAN Xuhao;ZHANG Guoxin(The Key Laboratory of Well Stability and Fluid&Rock Mechanics in Oil and Gas Reservoir of Shaanxi Province,Xi’an Shiyou University,Xi’an 710065,China;College of Petroleum Engineering,Xi’an Shiyou University,Xi’an 710065,China;State Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum,Beijing 102249,China)

机构地区：[1]陕西省油气井及储层渗流与岩石力学重点实验室/西安石油大学,西安710065 [2]西安石油大学石油工程学院,西安710065 [3]油气资源与工程国家重点实验室/中国石油大学(北京),北京102249

出　　处：《华南师范大学学报(自然科学版)》2025年第1期79-91,共13页Journal of South China Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(52304008,52474043);中国博士后基金项目(2023MD734223);陕西省教育厅科研计划项目(23JS047)。

摘　　要：为探究超临界CO_(2)压裂对储层渗透率的适应性,采用不同渗透率(0.08~1.0 mD)致密砂岩岩样的超临界CO_(2)压裂实验结合CT扫描技术定量分析了压裂诱导裂缝特征,并采用矿场尺度数值模拟对实验结果进行验证与补充。实验结果表明:超临界CO_(2)可有效压裂渗透率在0.08~0.3 mD范围内的岩样,且随着渗透率增加,诱导裂缝复杂度降低,裂缝体积减小;当渗透率超过0.5 mD时,超临界CO_(2)无法实现岩石压裂,但水压裂仍可有效压裂,这主要归因于流体性质的差异。数值模拟结果验证了实验结论,表明在矿场施工条件下,超临界CO_(2)可成功压裂不同渗透率储层,但压裂效果存在显著差异。随着储层渗透率增加(0.01~100 mD),裂缝半长、缝宽、缝高、分形维数及渗滤面积等参数均呈下降趋势,而滤失量逐渐增加,导致压裂效果逐渐变差。超临界CO_(2)更适用于低渗透率储层改造,在施工过程中需针对不同渗透性储层进行参数优化。该研究为超临界CO_(2)压裂非常规储层的施工方案设计提供了理论依据。To investigate the adaptability of supercritical CO_(2)fracturing to reservoir permeability,this study conducted supercritical CO_(2)fracturing experiments on tight sandstone samples with different permeabilities(0.08~1.0 mD).The characteristics of induced fractures were quantitatively analyzed using CT scanning,and the experimental results were validated and supplemented through field-scale numerical simulations.The results show that supercritical CO_(2)can effectively fracture rock samples with permeabilities in the range of 0.08~0.3 mD.As permeability increases,the complexity of induced fractures decreases,and the fracture volume reduces.When the permeability exceeds 0.5 mD,supercritical CO_(2)fails to fracture the rock,whereas hydraulic fracturing remains effective,primarily due to differences in fluid properties.Numerical simulations validated the experimental findings,indicating that supercritical CO_(2)can successfully fracture reservoirs with different permeabilities under field conditions,but the fracturing effectiveness varies significantly.As reservoir permeability increases(0.01~100 mD),parameters such as fracture half-length,width,height,fractal dimension,and filtration area decrease,while fluid loss gradually increases,leading to a decline in fracturing effectiveness.The study demonstrates that supercritical CO_(2)is more suitable for low-permeability reservoir stimulation,and parameter optimization is required during operations to adapt to reservoirs with different permeabilities.This research provides a theoretical foundation for the design of supercritical CO_(2)fracturing operations in unconventional reservoirs.

关 键 词：超临界CO_(2)压裂 储层渗透率 裂缝特征 数值模拟 致密砂岩 非常规储层 

分 类 号：TE348[石油与天然气工程—油气田开发工程] TE357.1