寺河矿东五盘2011ZX＿CC＿01井井喷原因

Exploration research on 2011ZX＿CC＿01 well blowout in East Five Panel of Sihe Mine

寺河东五盘2011ZX_CC_01井在正常钻进至奥陶灰岩时发生井喷,与其相邻12 m的2011ZX_CC_01(W1)井在正常钻进至K2灰岩时发生井喷。为查明井喷发生的原因,从井喷导水通道、水源、以及动力源3个方面展开研究。以地震资料为基础,利用三维地震精细解释技术,对可能存在的导水通道进行分析;利用多属性神经网络反演对矿区的富水性进行研究,分析井喷水的主要来源;利用地质分析方法和叠前同时反演技术,对井喷区的地应力和瓦斯压力进行研究,分析井喷的主要动力来源。研究结果表明:井喷区K2灰岩和奥陶系峰峰组灰岩富水性较好;井喷区处于小西凹背斜轴部和"山字形"构造的平分线上,地应力和瓦斯压力也大,具备井喷发生所需要的动力源;另外井喷区发育有一陷落柱,2011ZX_CC_01井和2011ZX_CC_01(W1)井位于陷落柱之内,由于陷落柱的影响,使得K2灰岩于奥陶系峰峰组灰岩之间水力联系密切,最终导致2011ZX_CC_01和2011ZX_CC_01(W1)发生井喷。

When the 2011ZX_CC_01 well was in normal drilling to Ordovician limestone,an eruption occurred,and also 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 ordovician 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 columns,K2 limestone has a close hydraulic relationship with the limestone of ordovician Fengfeng formation.This eventually led to a blowout in well 2011ZX_CC_01 and 2011ZX_CC_01(W1)well.