A novel experimental approach for fracability evaluation in tight-gas reservoirs

被引:74
作者
Wang, Daobing [1 ,2 ]
Ge, Hongkui [1 ,2 ]
Wang, Xiaoqiong [1 ,2 ]
Wang, Jianbo [1 ,2 ]
Meng, Fanbao [1 ,2 ]
Suo, Yu [1 ,2 ]
Han, Peng [1 ,2 ]
机构
[1] China Univ Petr, Unconvent Nat Gas Res Inst, Beijing 102249, Peoples R China
[2] China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China
基金
美国国家科学基金会;
关键词
Tight-gas reservoir; Fracability evaluation; Fracture network; Crack density; Velocity anisotropy; Stress sensitivity;
D O I
10.1016/j.jngse.2015.01.039
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Hydraulic fracturing is an effective stimulation method for the economic development of tight-gas reservoirs in which extremely low matrix permeability requires complex fracture networks. Petrophysical/mechanical experiments and XRD/SEM analyses demonstrate that volcanic sedimentary rock is characterized by developed natural fracture, strong brittleness, stress sensitivity, AE activity, weak anisotropy, and fluid sensitivity. Fracability index is often utilized as a key parameter to evaluate the ability to generate fracture networks. In this study, a new systematic experimental approach and a new mathematical model are established for the comprehensive evaluation of the fracability of tight-gas formations. These two methods integrate natural fracture, stress sensitivity, rock anisotropic nature, AE activity and crack density. The results indicate that the fracability index (FI) and the calculated crack density (CRD) are positively linearly correlated. The method is successfully applied to evaluate the fracability of the Yingtai gas field in northeast China. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:239 / 249
页数:11
相关论文
共 21 条
  • [1] Altamar R.P., 2013, THESIS U OKLAHOMA O
  • [2] Chong K.K., 2010, P CAN UNC RES INT PE, DOI 10.2118/133874-MS
  • [3] Fang C, 2014, SPE EAGE EUR UNC RES
  • [4] Fjær E, 2008, DEV PET SCI, V53, P175
  • [5] Guo TK, 2013, ROCK SOIL MECH, V34, P947
  • [6] EFFECTS OF POROSITY AND CLAY CONTENT ON WAVE VELOCITIES IN SANDSTONES
    HAN, D
    NUR, A
    MORGAN, D
    [J]. GEOPHYSICS, 1986, 51 (11) : 2093 - 2107
  • [7] Jafarpour, 2014, SPE W N AM ROCK MOUN
  • [8] Jin X., 2014, P SPE HYDR FRACT TEC
  • [9] KACHANOV M, 1994, ADV APPL MECH, V30, P259
  • [10] Liu YF, 2013, STAT INTERFACE, V6, P1