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Microscopic mechanism of periodical electroosmosis in reservoir rocks

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  • Faculty of Science, China University of Petroleum, Qingdao 266555, Shandong Province, P. R. China

Received date: 2011-11-21

  Revised date: 2012-04-09

  Online published: 2012-10-10

Supported by

Project supported by the National Natural Science Foundation of China (No. 41174101) and the Natural Science Foundation of Shandong Province of China (No. ZR2011DM002)

Abstract

Based on the electric double layer (EDL) theory and the momentum equation governing the electroosmosis flow, this paper presents an analytical solution to the peri- odical electroosmosis with a parallel straight capillary bundle model of reservoir rocks to reveal the microscopic mechanism of the electroosmotic flows in rocks. The theory shows that both the frequency dispersion characteristics of the macroscopic electroosmotic Darcy velocity in unsealed rocks and the electroosmotic pressure coefficient in sealed rocks de- pend on the porosity and electrochemical properties of reservoir rocks. The mathematical simulation indicates that the distribution of the periodical electroosmotic velocity is wave- like in the rock pore. The greater the porosity is, the greater electroosmotic the Darcy velocity and the smaller electroosmotic pressure coefficient are generated. The module values of the electroosmotic Darcy velocity and the electroosmotic pressure coefficient increase with the decreasing solution concentration or the increasing cation exchange ca- pacity without affecting the phase of the electroosmotic Darcy velocity.

Cite this article

Hui CHEN;Ji-teng GUAN;Wen-jing FANG . Microscopic mechanism of periodical electroosmosis in reservoir rocks[J]. Applied Mathematics and Mechanics, 2012 , 33(10) : 1275 -1286 . DOI: 10.1007/s10483-012-1621-9

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