Research on heavy oil thermal recovery by CO 2 steam flooding with help of combination of borehole-surface electric potential and cross-borehole electric potential

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Abstract

With an increasing tendency towards more demand for energy resources, the supply of energy as a focus of global strategy is attracting more and more attention from the world. However, on the one hand, conventional hydrocarbon resources are decreasing gradually, and therefore it is definitely an urgent task to search for renewable and replaceable resources at the present time. On the other hand, it has been proved that the total reserves of heavy oil are already up to 1105×108 tons around the world, which means that exploring heavy oil can be a beneficial supplement for alleviating the shortage of oil and gas. Moreover, it is noteworthythat because the heavy oil can be exploited by heated CO 2, collecting and consuming CO 2 during the production process will help to relieve global warming.In this study, we take the feasibility of heavy oil recovery by CO 2 steam into consideration only from the viewpoint of geophysics. In the process of research, with the help of borehole-surface electric potential and cross-borehole electric potential, the entire procedures from heating heavy oil reservoir and optimizing the location of well to deciding the layer of perforation are exhibited completely. In the course of calculation, potential distributions corresponding to a point source of current are acquired by solving the Poisson equation using a direct and explicit finite difference technique for a lower half-space with 3-D distribution of conductivity. As for computation of a large sparse matrix, the technique of non-zero bandwidth storage and the Incomplete Cholesky Conjugate Gradient method are adopted. The consequences prove that with the assistance of cross-borehole electric potential combining with borehole-surface electric potential, the project of heavy oil recovery by CO 2 steam is feasible and effective.

Original languageEnglish
Pages (from-to)797-816
Number of pages20
JournalEnergy Exploration and Exploitation
Volume29
Issue number6
DOIs
Publication statusPublished - Dec 1 2011

Fingerprint

Boreholes
Steam
Crude oil
Recovery
Electric potential
Geophysics
Conjugate gradient method
Petroleum reservoirs
Poisson equation
Global warming
Energy resources
Hot Temperature
Hydrocarbons
Bandwidth
Heating
Gases

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

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title = "Research on heavy oil thermal recovery by CO 2 steam flooding with help of combination of borehole-surface electric potential and cross-borehole electric potential",
abstract = "With an increasing tendency towards more demand for energy resources, the supply of energy as a focus of global strategy is attracting more and more attention from the world. However, on the one hand, conventional hydrocarbon resources are decreasing gradually, and therefore it is definitely an urgent task to search for renewable and replaceable resources at the present time. On the other hand, it has been proved that the total reserves of heavy oil are already up to 1105×108 tons around the world, which means that exploring heavy oil can be a beneficial supplement for alleviating the shortage of oil and gas. Moreover, it is noteworthythat because the heavy oil can be exploited by heated CO 2, collecting and consuming CO 2 during the production process will help to relieve global warming.In this study, we take the feasibility of heavy oil recovery by CO 2 steam into consideration only from the viewpoint of geophysics. In the process of research, with the help of borehole-surface electric potential and cross-borehole electric potential, the entire procedures from heating heavy oil reservoir and optimizing the location of well to deciding the layer of perforation are exhibited completely. In the course of calculation, potential distributions corresponding to a point source of current are acquired by solving the Poisson equation using a direct and explicit finite difference technique for a lower half-space with 3-D distribution of conductivity. As for computation of a large sparse matrix, the technique of non-zero bandwidth storage and the Incomplete Cholesky Conjugate Gradient method are adopted. The consequences prove that with the assistance of cross-borehole electric potential combining with borehole-surface electric potential, the project of heavy oil recovery by CO 2 steam is feasible and effective.",
author = "Benyu Su and Yasuhiro Fujimitsu",
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