The Research on Brittleness of Shale in Longmaxi Formation, the Southeastern Chongqing Area
- 作者：Chen QiaoLiu HongWang Li-shaWang nstitute of GreenIntelligent TecSenFan Xiao-wenWang Qi-jun
- 会议时间：2013-05-01
- 关键词：Longmaxi Formation ; The southeast of Chongqing ; Shale ; Mineral composition ; Brittleness coefficient
- 作者单位：Chen Qiao,Liu Hong,Wang nstitute of Green,Intelligent TecSen(Shale Gas Explore Technology & Research Center Chongqing Institute of Green and Intelligent Technology, Chongqing, China)Wang Li-sha(Shale Gas Explore Technology & Research Center Chongqing Ihnology, Chongqing, China)Fan Xiao-wen(CNPC Logging Shanxi, China)Wang Qi-jun(School of petroleum engineering, SWPU, Sichuan, China)
- 母体文献：第二届全国特殊气藏开发技术研讨会论文集
- 会议名称：第二届全国特殊气藏开发技术研讨会
- 会议地点：重庆
- 主办单位：重庆市科学技术协会
- 语种：chi
摘要
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.