非常规油气开采中的微纳米力学问题研究进展

Research progress of micro/nano mechanical problems in unconventional oil and gas exploitation

非常规油气资源储量丰富,开发前景广阔,其开采过程涉及一系列微纳米力学问题.聚合物、纳米流体驱油技术能够提高石油采收率,它们的微观驱替机理引起了人们的广泛关注.页岩气以吸附和游离态贮存于页岩微纳米孔隙中,在注入气的驱替下,流入宏观裂缝.本文结合课题组相关工作,综述了目前非常规油气开采中的微纳米力学问题研究进展.重点讨论了强化采油技术中粘弹性聚合物溶液和纳米流体的微观驱替机理和页岩气的吸附、注气驱替以及微流动机制,总结并展望了下一步研究工作的重点和方向.

Unconventional oil and gas resources have a promising development prospect due to their abundant reserves. The exploitation of them involves a series of micro/nano mechanical problems. To enhance the oil recovery,polymer flooding and nanofluid flooding are employed. The microscopic displacement mechanisms of these two methods have attracted wide attention. Shale gas,which is stored in adsorbed state and bulk state in the micro/nano pores of shale,flows into the fractures with the displacement of injection gases. Recent research progress ofmicro/nano mechanical problems in unconventional oil and gas exploitation based on our previous study was reviewed. The microscopic displacement mechanisms of polymer and nanofluid flooding were discussed. Then,the adsorption of shale gas,displacement of injection gases and the mechanisms of micro flow were reviewed. Finally,the direction and key point of future work were discussed.