The Research on Brittleness of Shale in Longmaxi Formation, the Southeastern Chongqing Area
Water fracturing has been recognized as the key technologies for commercial exploitation of the shale,and the fracturing design are based on the analysis of brittleness.This article studies Longmaxi exposures in southeast of Chongqing, and carries on experiments to analysis the feasibility of the fracturing from the aspect of brittleness.The results show that the shale is well bedded, tight, low porosity and low permeability in this area.And it needs to be reconstructed.The analysis of the mineral components shows that Longmaxi shale has a high content of brittle minerals, such as quartz and carbonate, and the content of these brittle minerals range from 49% to 65%, with an average of 57%.While the clay mineral content is low, and there is no kaolinite or montmorillonite which contain serious hydration expansion, on the basis of it.these, the shale brittleness coefficient calculated by the mineral composition and dynamic elastic parameters range from 49% to 77% and the average brittleness coefficient is higher than 57%, which shows the formation is brittle.Comparison with the successful exploitation of the North American shale reservoir, Longmaxi shale in southeast of Chongqing is fit to fracturing operations.According to the North American shale fracturing practical experience, we suggest that the rock brittleness should be taken into consideration in the fracturing design process, and the fracturing fluid should be with large volume of fluid, low proppant content and less proppant consuming.
Longmaxi Formation The southeast of Chongqing Shale Mineral composition Brittleness coefficient
Chen Qiao Liu Hong Wang Li-sha Wang nstitute of Green Intelligent TecSen Fan Xiao-wen Wang Qi-jun
Shale Gas Explore Technology & Research Center Chongqing Institute of Green and Intelligent Technolo Shale Gas Explore Technology & Research Center Chongqing Ihnology, Chongqing, China CNPC Logging Shanxi, China School of petroleum engineering, SWPU, Sichuan, China
国内会议
重庆
英文
5-10
2013-05-01（万方平台首次上网日期，不代表论文的发表时间）