期刊
JOURNAL OF MAGNETIC RESONANCE
卷 247, 期 -, 页码 1-8出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2014.08.003
关键词
Nuclear Magnetic Resonance (NMR); Two-dimensional measurements; Fluid viscosity; Down-hole NMR system; Crude oil
资金
- National Natural Science Foundation of China [41130417]
- 111 Program [B13010]
- 863 Program [2013AA064605]
- Program for Chang Jiang Scholars and Innovative Research Team in University
The rapid prediction of fluid viscosity, especially the fluid in heavy-oil petroleum reservoirs, is of great importance for oil exploration and transportation. We suggest a new method for rapid prediction of fluid viscosity using two-dimensional (2D) NMR relaxation time distributions. DEFIR, Driven-Equilibrium Fast-Inversion Recovery, a new pulse sequence for rapid measurement of 2D relaxation times, is proposed. The 2D relation between the ratio of transverse relaxation time to longitudinal relaxation time (T-1/T-2) and T-1 distribution of fluid are obtained by means of DEFIR with only two one-dimensional measurements. The measurement speed of DEFIR pulse sequence over 2 times as fast as that of the traditional 2D method. Using Bloembergen theory, the relation between the distributions and fluid viscosity is found. Precise method for viscosity prediction is then established. Finally, we apply this method to a down-hole NMR fluid analysis system and realized on-site and on-line prediction of viscosity for formation fluids. The results demonstrated that the new method for viscosity prediction is efficient and accurate. (C) 2014 Elsevier Inc. All rights reserved.
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