Application of three-dimensional plugging technology for abandoned oil wells in coal mining areas

As Shuangma mine field in Majiatan, Lingwu City of Ningxia, is located in an area with overlapped extraction of coal and oil/gas, great amount of abandoned oil well have been left after petroleum extraction by oil system, the abandoned oil wells cause certain influence on the safety of the subsequent coal mines. In order to eliminate the potential safety hazards and ensure the safe production in coal mines, it was proposed to apply the three dimensional plugging technology in the abandoned oil wells exiting in coal mines. With this plugging technology, two abandoned oil wells were safely exposed and passed through in a working face in Shuangma Mine of Shenhua Ningxia Coal Group.