编号：CDUT-2023-7

标题：Thermal stimulation of shale formations by electromagnetic heating:A clean technique for enhancing oil and gas recovery

入藏号：WOS:000586917600038

中国科学院文献情报中心期刊分区： 环境科学与生态学1区/TOP（2020年基础版）

本校作者：胡蓝霄；解馨慧；邓虎成

来源出版物： JOURNAL OF CLEANER PRODUCTION  卷: 277  文献号: 123197

出版年：2020

第一地址：成都理工大学

关键词：Electromagnetic heating；Waterless fracturing；Thermal stress；Fracture；Shale

代表图：

Graphical abstract

摘要：Electromagnetic heating has been proposed to environmentally produce shale gas, shale oil, and oilshale. Unlike hydraulic fracturing that cracks shale by tensile and shear stresses through injecting amassive amount of fracturing fluid, electromagnetic heating creates fractures by internal stress caused bythe interaction between formation rocks and electromagnetic waves, which eliminates the use of water.In this study, we conducted experiments and simulations to investigate the influential factors, stimulatingmechanisms, and fracturing performance of electromagnetic heating for its application in stimulatingshales. First, shale samples with different compositions are subjected to electromagnetic(microwave) heating for 3 min. Then, scanning electron microscopy coupled with energy dispersive Xray,N2-adsorption/desorption, and microscope-imaging are used to characterize pore-structure changesand fracture generation of shale samples. Finally, a finite element theoretical simulation is conducted toinvestigate the effects of confining pressure, electromagnetic heating power, and time on the stressdistributions of the sample. Results show that both macro-fracture and micro-fractures are created afterelectromagnetic heating; samples either crumble into pieces or fracture into several parts, depending ontheir clay and pyrite contents. The stimulating mechanisms of electromagnetic heating are shrinkage ofclay, and decomposition of organic content, and tensile failure by the heterogeneous expansions ofminerals, which significantly enhance the pore space. Moreover, simulations show that the expansion ofpyrite induces considerable tension that causes tensile failures to the shale sample, which echoes wellwith the experimental observations. Confinement can lower the induced tensile stress, which can beovercome by raising the electromagnetic heating power. Our study demonstrates that electromagneticheating is a promising stimulation technique to eliminate water usage and effectively fracture the shalerock, leading to greener production of hydrocarbon resources from shale.

文章链接地址:https://www.sciencedirect.com/science/article/pii/S095965262033242X?via%3Dihub