Simulation of Acid–rock Heterogeneous Flow Reaction Based on the Lattice Boltzmann Method
International Journal of Oil, Gas and Coal Engineering
Volume 7, Issue 6, November 2019, Pages: 130-143
Received: Nov. 3, 2019; Accepted: Nov. 29, 2019; Published: Dec. 13, 2019
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Bo Ning, Research Institute of Petroleum Exploration and Development, Petro China, Beijing, China
Zhonghua Chen, School of Petroleum Engineering, Chongqing University of Science & Technology, Chongqing, China
Ninghai Fu, Research Institute of Petroleum Exploration and Development, Petro China, Beijing, China
Xin Zhao, Research Institute of Petroleum Exploration and Development, Petro China, Beijing, China
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Matrix acidizing is an essential strategy to maintain or increase the productivity or injectivity of hydrocarbon wells. However, for sandstone reservoirs, the heterogeneous flow reaction mechanism of acid–rock in porous media is very complex because of their complex mineral and chemical compositions. It is often difficult to match real formation conditions by experimental simulation. Also, traditional numerical simulation methods have the disadvantages of complex boundary processing and low computational efficiency. In this study, the lattice Boltzmann method (LBM) was used to establish the heterogeneous flow reaction model of acid–rock from a new perspective, which was solved by MATLAB to obtain the distribution of temperature, concentration of various substances, porosity, and permeability. The simulation results indicate that with increases in injection time and injection speed, the temperature and mass transfer distance of the acid will also increase. Changing the injection time had a more obvious influence on the transfer of temperature and mass than did changing the injection speed. The increasing rates of porosity and permeability in the middle of the flow channel were the highest. The fast-reaction mineral content, hydrofluoric acid injection concentration, and acid injection time had a great influence on the acidizing effect, whereas the slow-reaction mineral content, acid injection temperature, and injection speed had little influence on the acidizing effect. The results suggest that to improve the acidizing effect, priority should be given to improve the HF concentration and acid dose. It will be important for further guiding the optimization of acidizing process design parameters.
Heterogeneous Reaction, Lattice Boltzmann Method, Matrix Acidizing, Porous Media, Sandstone Reservoirs
To cite this article
Bo Ning, Zhonghua Chen, Ninghai Fu, Xin Zhao, Simulation of Acid–rock Heterogeneous Flow Reaction Based on the Lattice Boltzmann Method, International Journal of Oil, Gas and Coal Engineering. Vol. 7, No. 6, 2019, pp. 130-143. doi: 10.11648/j.ogce.20190706.14
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