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Open Access

ARTICLE

An Integrated Optimization Method for CO Pre-Injection during Hydraulic Fracturing in Heavy Oil Reservoirs

Hong Dong1, Xiding Gao2,*, Xinqi Zhang1, Qian Wang1,3, Haipeng Xu1, Binrui Wang2, Chengguo Gao1, Kaiwen Luo2, Hengyi Jiang2
1 PetroChina Xinjiang Oilfield Company, Karamay, 834000, China
2 National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, China
3 Department of Modern Mechanics, University of Science and Technology of China, Hefei, 230026, China
* Corresponding Author: Xiding Gao. Email: email

Fluid Dynamics & Materials Processing https://doi.org/10.32604/fdmp.2024.049406

Received 06 January 2024; Accepted 11 March 2024; Published online 30 May 2024

Abstract

CO 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 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.

Keywords

Heavy oil reservoir; pre-storage CO energy fracturing; horizontal well fracturing parameters; numerical simulation

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