Exploration research on 2011ZX_CC_01 well blowout in East Five Panel of Sihe Mine

When the 2011ZX_CC_01 well was in normal drilling to Ordovician limestone,an eruption occurred,and al-so an eruption occurred in its adjacent 12m 2011ZX_CC_01 (W1) well when it was drilled to K2 limestone. In order to analyze the causes of blowout,the research was carried out from three aspects including the water flow channel,the wellspring water supply,and the power source of the blowout. Based on seismic data,3D seismic fine interpretation technique was used to analyze the possible water diversion channels. The apparent resistivity neural network inversion technique was used to study the water-rich water in the blowout zone and analyzed the main source of water spraying. The geological analysis method and the inversion technique were used to study the crustal stress and the coal seam gas pressure in the blowout area and analyzed the main power source of the blowout. The limestone of K2 limestone and or-dovician Fengfeng formation in the blowout zone are water-rich. The blowout zone is located on the bisection line of the anticlinal axis of Xiaoxiwa depression and the “mountain figure” structure. The ground stress and gas pressure are also large with the power source needed for blowout. In addition, there is a collapse column in the blowout zone. The 2011ZX_CC_01 and 2011ZX_CC_01 (W1) well are within the collapse column. Due to the influence of collapse col-umns,K2 limestone has a close hydraulic relationship with the limestone of ordovician Fengfeng formation. This even-tually led to a blowout in well 2011ZX_CC_01 and 2011ZX_CC_01 (W1) well.