Abstract
L-type horizontal well has became a new well type for CBM development in Qinshui Basin, And the staged fracturing technique of horizontal well is the key technology to improve gas production of single well for coalbed gas. At present, the main fracturing technology of horizontal well is the fracturing technology of tubing carrying a packer at the bottom, and daily gas production of it exceed 10000 cubic meters in Zhengzhuang with ultra-low permeability. And the average daily gas production of a well is more than 6000 cubic meters. In recent years, we have gradually explored different fracturing technologies, containing plug-perforation joint fracturing, coiled tubing fracturing and staged fracturing of spray gun with expanding diameter. Taking the L-type horizontal wells of the casing fracturing in Qinnan as the research object, the adaptability analysis and the evaluation of development effect of four fracturing technologies, including the fracturing of common tubing carrying a packer at the bottom, the fracturing of spray gun with expanding diameter, plug-perforation joint fracturing and coiled tubing fracturing, are carried out. The analysis results show that the fracturing technology of tubing carrying a single packer at the bottom has the advantages of simplicity, low price and good effect on development, which can be used as the main technology of the L-type horizontal wells of the casing fracturing.
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