TY  - EJOU
AU  - Dong, Hong 
AU  - Gao, Xiding 
AU  - Zhang, Xinqi 
AU  - Wang, Qian 
AU  - Xu, Haipeng 
AU  - Wang, Binrui 
AU  - Gao, Chengguo 
AU  - Luo, Kaiwen 
AU  - Jiang, Hengyi 

TI  - An Integrated Optimization Method for CO<sub>2</sub> Pre-Injection during Hydraulic Fracturing in Heavy Oil Reservoirs
T2  - Fluid Dynamics \& Materials Processing

PY  - 2024
VL  - 20
IS  - 9
SN  - 1555-2578

AB  - CO<sub>2</sub> pre-injection during hydraulic fracturing is an important method for the development of medium to deep heavy oil reservoirs. It reduces the interfacial tension and viscosity of crude oil, enhances its flowability, maintains reservoir pressure, and increases reservoir drainage capacity. Taking the Badaowan Formation as an example, in this study a detailed three-dimensional geomechanical model based on static data from well logging interpretations is elaborated, which can take into account both vertical and horizontal geological variations and mechanical characteristics. A comprehensive analysis of the impact of key construction parameters on Pre-CO<sub>2</sub> based fracturing (such as cluster spacing and injection volume), is therefore conducted. Thereafter, using optimized construction parameters, a non-structured grid for dynamic development prediction is introduced, and the capacity variations of different production scenarios are assessed. On the basis of the simulation results, reasonable fracturing parameters are finally determined, including cluster spacing, fracturing fluid volume, proppant concentration, and well spacing.
KW  - Heavy oil reservoir; pre-storage CO<sub>2</sub> energy fracturing; horizontal well fracturing parameters; numerical simulation

DO  - 10.32604/fdmp.2024.049406