1.Low-Permeability Oil and Gas Exploration and Development of National Engineering Laboratory, Xi’an Shaanxi
710018, P.R.China;
2.Institute of Engineering Technology, Chuanqing Drilling and Exploration Engineering Company, Xi’an Shaanxi 710018, P.R.China;
3.The Four Oil Production Factory of Changqing Oilfield, Jingbian Shaanxi 718500, P.R.China