Lin H.,Room A1808 of Keji Building |
Chen L.,Room A1808 of Keji Building |
Zhang Y.,Room A1808 of Keji Building |
Zhang Z.,Room A1808 of Keji Building
Drilling Fluid and Completion Fluid | Year: 2014
The major problems facing coal bed methane development have been formation cave-in, instability and even abandonment of well bore. This paper discusses the studies conducted on the integrated mechanic parameters and physical-chemical properties of the No. 4 and No. 9 coal rocks in Ningwu Basin, and the mechanism of borehole cave-in, providing suggestions and data for coal bed drilling in Ningwu Basin.