Oil Movement Investigation at Pore-Scale in Waterflood Fluvial Reservoir

DOI

10.2991/ifeesm-17.2018.195How to use a DOI?

Keywords

fluvial reservoir; NMR; pore-scale residual oil distribution; horizontal well

Abstract

In the process of fluvial reservoirs development, bottom water coning leads to the problem of increasing water cut and low oil production. There are still significant amount of remaining oil in the upper layers of reservoirs after long-term waterflood. Drilling one or more lateral drainholes near the top of the formation is the main acceptable enhance oil recovery techniques to unlock additional recoverable reserves, but the microscopic oil movement in pores of different sizes is unclear. Nuclear magnetic resonance (NMR) is an effective way for analyzing pore structures and quantifying oil saturation in the rock matrix. In this paper, three-dimension physical model experiment was performed to evaluate the distribution and movement of oil in pores. During the water flooding progress, oil in large-medium pores was displaced first. After further displacement, oil in small pores begin to be produced. The oil recovery of small pores was even larger than the medium and large pores in the later stage of waterflood because of imbibition effect. The ultimate recovery of large pore in both top and bottom formation was almost the same, while the ultimate recovery of small pores varied with the degree of displacement. Substantial amount of remaining oil existed in the upper layer and in the small-medium pore of bottom layer after long-term waterflood.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

Download article (PDF)

TY  - CONF
AU  - Fan Liu
AU  - Xuelin Wu
AU  - Wensheng Zhou
AU  - Jian Shen
AU  - Liu Liu
PY  - 2018/02
DA  - 2018/02
TI  - Oil Movement Investigation at Pore-Scale in Waterflood Fluvial Reservoir
BT  - Proceedings of the 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017)
PB  - Atlantis Press
SP  - 1059
EP  - 1062
SN  - 2352-5401
UR  - https://doi.org/10.2991/ifeesm-17.2018.195
DO  - 10.2991/ifeesm-17.2018.195
ID  - Liu2018/02
ER  -