Research and application of coal-water separation technology for boreholes in extremely soft coal seam of Gaocheng Coal Mine
In order to prevent and control gas disasters in soft and low permeability coal seams,coal unloading and permeability en-hancement measures such as hydraulic punching and seam cutting are becoming increasingly common in gas extraction,leading to diffi-culties in coal-water separation during drilling.For the problems of coal slurry not easy to settle and low efficiency of coal-water separa-tion in extremely soft coal seams in Gaocheng Coal Mine,the analysis of coal slurry particle size distribution characteristics and an in-vestigation of the application of coal-water separation method for cross-seam drilling were carried out.The results found that micro-fine coal slurry was easily formed under the action of high-pressure hydraulic in soft coal seams,and the distribution of coal particles con-formed to the Rosin-Rammler function,with a characteristic particle size of 0.84 mm and a uniform distribution of fine-grained coal slurry;single separation methods such as coal bag cofferdam sedimentation,vibrating screen type separator and plate and frame filter press had problems of low efficiency,high labor intensity and inaccurate measurement in application.Based on the test results,a multi-level separation process method for coal-water from cross-seam drilling was proposed and applied,using stainless steel welded bar slit screens for primary filtration and separation,arranging sedimentation ponds in low areas of the roadway for centralized sedimentation for intermediate filtration and separation,and using plate and frame filter presses for final filtration and separation.This method has high sedimentation efficiency,realizes clear water into the water sump,and promotes safe and civilized production.
万方数据
维普
