TY - JOUR
TI - Numerical simulation study on factors affecting the pre-CO2 fracturing effect in shale oil reservoirs: A case study on Kong-2 member in Cangdong Sag, China
AU - Song Shun-Yao
AU - Liu Xue-Wei
AU - Fu Yong-Qiang
AU - Zang Yu-Xi
AU - Wang Hai-Zhu
AU - Tian Fu-Chun
AU - Shao Li-Fei
AU - Jia Yun-Peng
AU - Zhao Tao
AU - Yin Qi-Wu
JN - Thermal Science
PY - 2024
VL - 28
IS - 2
SP - 1053
EP - 1059
PT - Article
AB - A novel procedure has emerged in recent years within oilfields – namely, the utilization of a hybrid fracturing method employing pre-CO2 injection along with sand-carry slick water. In this paper, based on the real logging data of shale oil reservoirs in the second member of Cangdong Sag, Huanghua Depression, combined with the GOHFER, a coupled 3-D hydraulic fracture propagation model is proposed. This research delves into an examination of how engineering factors exert their influence on the process of fracture propagation. The quantitative analysis is conducted encompassing critical fracture parameters such as half-length, height, and width, and self-defined fracture seepage area and fracture front fractal dimension. The research findings indicate that as injection displacement increases, the fracture shape undergoes a transformation from being “long, low, and wide” to becoming “short, high, and narrow”.