Key Technology of Large Diameter Wire-line Coring Applied in the Soft Seam in Qinshui Basin

Abstract:

As a CBM production well, 2013ZX-SH-UM15V is located in Qinshui basin in Shanxi Province. Coal-bed coring was conducted in 3# and 15# coal-beds during the construction in order to obtain the coal-bed gas content and coal rock characteristics and some other parameters. Because of the soft coal in lower parts of 3# and 15# coal-beds, the core recovery was once very low, but combined with the coal rock characteristics in 3# and 15# coal-beds and by the repeated tests, core recovery was up to more than 90%. The paper summarizes the key technology of wire-line coring in soft coal-bed in this region.

Key words:wire-line coring technology; soft seam; core recovery; Qinshui basin