Suscripción a Biblioteca: Guest
Portal Digitalde Biblioteca Digital eLibros Revistas Referencias y Libros de Ponencias Colecciones
Special Topics & Reviews in Porous Media: An International Journal
ESCI SJR: 0.259 SNIP: 0.466 CiteScore™: 0.83

ISSN Imprimir: 2151-4798
ISSN En Línea: 2151-562X

Special Topics & Reviews in Porous Media: An International Journal

DOI: 10.1615/SpecialTopicsRevPorousMedia.2017022655
pages 57-65

LOW-FIELD NMR ANALYSIS OF FLUIDS IN GLUTENITE CORES FROM XINJIANG OILFIELD

Xiaoguang Wang
School of Geoscience, China University of Petroleum (Huadong), China; Research Institute of Exploration and Development of Xinjiang Oilfield Company, PetroChina, Karamay, China
Hongjie Cheng
Xinjiang Oilfield Company, PetroChina, Beijing, China
Weifeng Lv
Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, China; State Key Laboratory of Enhanced Oil Recovery, Research Institute of Petroleum Exploration and Development, CNPC, Beijing, China
Xu Chen
State Key Laboratory of Enhanced Oil Recovery, Research Institute of Petroleum Exploration and Development, CNPC, Beijing, China
Ninghong Jia
State Key Laboratory of Enhanced Oil Recovery, Research Institute of Petroleum Exploration and Development, CNPC, Beijing, China
Xiangfei Geng
State Key Laboratory of Enhanced Oil Recovery, Research Institute of Petroleum Exploration and Development, CNPC, Beijing, China

SINOPSIS

The online monitoring and visualization of fluid flow in porous media have become an important experimental method for studying the microscopic mechanism and distribution of oil flooding. By combining the results of low-field nuclear magnetic resonance (NMR) and core-flooding experiments, this study identifies the relationship between core transverse relaxation time (T2) and pore size. Interpolation and the least-squares method were utilized to establish the relationship between pore size and the T2 spectra of the core NMR after water saturation. Gravel samples with medium-high permeability (256 mD) and low permeability (7.51 mD) were collected from Xinjiang Oilfield. The samples were used in flooding experiments with different fluids. The core pore structure and the mobile fluid, mobile oil, and residual oil distributions of the samples were determined on the basis of NMR analysis. The crude oil production rate of water flooding and the effects of water flooding on different pore sizes were also investigated. Experimental results show that the average pore diameter of the medium-high permeability core was 72 μm. Its pore size distribution ranged from 1 to 500 μm. The average pore diameter of the low-permeability core was 86 nm. Its pore size ranged from 10 nm to 1 μm. The results of flooding experiments reveal that water flooding is mainly distributed in pores with diameters that are > 10 μm.