Effect of Isolated Fracture on the Carbonate Acidizing Process

Frontiers in Earth Science

Haiyang Zhang¹  Tao Huang²  Hongchuan Xing³  Jun Yao³  Cunqi Jia³ 

[1] Petroleum Department, Khalifa University, Abu Dhabi, United Arab Emirates;School of Petrochemical Engineering and Environment, Zhejiang Ocean University, Zhoushan, China;School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, China;

关键词: fracture acidizing;    two-scale continuum model;    carbonate reservoirs;    reactive flow;    carbonate acidizing;   

DOI  :  10.3389/feart.2021.698086

来源: DOAJ

【 摘 要 】

Carbonate reservoirs are one of the most important fossil fuel sources, and the acidizing stimulation is a practical technique for improving the recovery of carbonate reservoirs. In this study, the improved two-scale continuum model, including the representative elementary volume (REV) scale model and the upscaling model, is used to study the acidizing process with an isolated fracture. Based on this model, a comprehensive discussion is presented to study the effect of the physical parameters of the isolated fracture on the acidizing results and dissolution images, including the isolated fracture geometry, location, and morphology. Results show that the isolated fracture system is still the target system for the acidizing stimulation. The isolated fracture provides a limited contribution to the core porosity. The permeability of the core sample with fracture can be obviously increased only when the fracture penetrates through the whole sample. The existence of the isolated fracture reduces the consumption of acid solution to achieve a breakthrough. The acidizing curve is sensitive to the change of the length, aperture, and position of the isolated fracture. The acidizing curve difference corresponding to different rotation angles has not changed significantly for clockwise rotation and anticlockwise rotation groups.

【 授权许可】

Unknown