Numerical Simulation Research on Microwave In-situ Heating Technology for Developing Heavy Oil in Low-permeability Reservoirs

doi:10.3969/j.issn.1006-6535.2020.06.017

Abstract

Abstract: In the exploitation of low-permeability heavy oil reservoirs, aiming at the problems such as low reservoir injection capacity, high heat loss, and large water consumption, etc., numerical simulation technique was used to study the microwave heating technology for developing heavy oil. Through establishing multiple physical field models such as electromagnetic field model, heat transfer field model, and flow field model, the heavy oil viscosity reduction effect and heat transfer mechanism of microwave radiation was clarified. The research results show that after microwave heating, heavy oil reservoirs can be divided into three zones, namely electromagnetic penetration zone, conduction zone in porous media and unheated zone; the best radiation frequency is 2 450 MHz, and increasing power can quickly increase the formation temperature; in order to avoid overheating around the wellbore, a stepped heating mode with gradual power reduction should be adopted; hydraulic fractures can effectively improve the seepage channels of low-permeability reservoirs, and it can be used in conjunction with microwave heating to develop heavy oil reservoirs. This research can provide a reference for developing low-permeability and high-viscosity heavy oil.

Key words: low-permeability heavy oil reservoir, microwave heating, numerical simulation, multiple physical field, hydraulic fracture, exploitation mechanism, influencing factor

CLC Number:

TE349

Li Xiaogang, Zhu Jingyi, Yang Zhaozhong, Xie Shiyi, Jia Min. Numerical Simulation Research on Microwave In-situ Heating Technology for Developing Heavy Oil in Low-permeability Reservoirs[J]. Special Oil & Gas Reservoirs, 2020, 27(6): 120-126.

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