Progress and development directions of stimulation techniques for ultra-deep oil and gas reservoirs

LEI Qun,XU Yun,YANG Zhanwei,CAI Bo,WANG Xin,ZHOU Lang,LIU Huifeng,XU Minjie,WANG Liwei,Li Shuai

Table 2 Technical indicators of ultra-deep reservoir stimulation and typical wells in China.

Stimulation parameter Value Typical well Maximum depth of acidizing in vertical well 8 882 m Lutang 1 Maximum depth of fracturing in vertical well 7 620 m Keshen 13 Maximum temperature 205 °C Niudong 1 Maximum stage number in vertical well (highly deviated well) 6 layers Gaoshi 001-X25 Maximum depth of horizontal well 8 008 m Tazhong 862H Maximum horizontal section length 1 561 m Tazhong 721-8H Maximum stage number of horizontal section 12 stages Tazhong 541-H1 Maximum treatment pressure in the case with non-weighted fracturing fluid 122 MPa Keshen 902 Maximum treatment pressure in the case with weighted fracturing fluid 136 MPa Dabei 301 Maximum fluid volume 8 588 m3 Tazhong 862H Maximum proppant volume 159 m3 Keshen 1002 Maximum displacement 11.2 m3/min Dabei 101-1H