Fracturing geological layer selection and fracturing transformation technology of coalbed methane wells of Wenjiaba block in Zhijin County of Guizhou Province
The geological resources of coalbed methane in Guizhou Province are very abundant.The Upper Permian Longtan Formation and Changxing Formation are the main coal-bearing strata in Zhijin area.In recent years,with the gradual advancement of exploration and development,coalbed methane production in Wenjiaba block achieved great results.In this paper,the reservoir reconstruction technology of high-yield coalbed methane wells in Wenjiaba block was studied,and the fracturing reconstruction process system suitable for the block was established.Based on the study of coal reservoir characteristics in this block,the rock mechanics characteristics,porosity and permeability conditions and gas content of coal reservoir were clarified,and the fracturing geological layer selection was optimized.In view of the characteristics of many and thin coal seams and shallow burial,a fracturing technology suitable for multi-seam'staged fracturing and multi-layer production'was formed,large-scale fracturing transformation was carried out to increase the SRV,ensure the gas production effect,and strive to increase the storage and production of coalbed methane in the block.
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