Study on Pulse Characteristic of Produced Crude Composition in CO 2 Flooding Pilot Test

It has been observed in many laboratory tests that the carbon number of the maximum concentration components (CNMCC) of produced oil varies monotonically with CO 2 injection volume at the core scale. However, in CO 2 flooding pilot test at the field scale, we find that the CNMCC is usually nonmonoto...

Full description

Saved in:
Bibliographic Details
Published in:Geofluids 2018, Vol.2018, p.1-5
Main Authors: Diwu, Pengxiang, Liu, Tongjing, You, Zhenjiang, Hou, Ganggang, Qiao, Runwei, Zhao, Lekun
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:It has been observed in many laboratory tests that the carbon number of the maximum concentration components (CNMCC) of produced oil varies monotonically with CO 2 injection volume at the core scale. However, in CO 2 flooding pilot test at the field scale, we find that the CNMCC is usually nonmonotonic function of CO 2 injection volume, which is called “pulse characteristic” of CNMCC. To investigate the mechanism of this phenomenon, we analyze the physical process of CO 2 flooding in heterogeneous reservoir and explain the reason of the pulse characteristic of CNMCC. Moreover, two 3D reservoir models with 35 nonaqueous components are proposed for numerical simulation to validate the conjecture. The simulation results show that pulse characteristic of CNMCC only occurs in the heterogeneous model, confirming that the pulse characteristic results from the channeling path between wells, which yields nonmonotonic variation of oil-CO 2 mixing degree. Based on it, a new method can be developed to identify and quantify the reservoir heterogeneity.
ISSN:1468-8115
1468-8123
DOI:10.1155/2018/2968629