An Experimental Study Of The Movement Of The Oil Water Contact During Water Flooding

Author : Zeyu Lin
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (133 download)

DOWNLOAD NOW!

Download or read book Experimental Study About Radial Viscous Fingering in Heavy Oil Reservoir written by Zeyu Lin and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Viscous fingering is an unstable flow phenomenon between two fluids with different viscosities, and it is widely found in many kinds of viscous displacements in nature, such as the flow of rainwater or contaminants through soil and flow of oil or natural gas through reservoirs. In petroleum industry, viscous fingering will be encountered frequently during waterflooding or chemical flooding in heavy oil production. Because of the exist of viscous fingering, the breakthrough time is shorted significantly, which causes oil and natural gas production decreases significantly. Many researches have been conducted to further study the mechanism of viscous fingering. Hele-Shaw model, sand-pack model, 3D model and micromodel are the four commonmodel used in this area. Most researchers prefer experimental study about linear displacement using sand-pack model and micromodel with low viscosity oil, while a few scientists prefer to simulater radial displacement using small scale micromodel such as one quarter of five spots model. Considering the flow patterns near wells, larger scale and range of oil viscosity, experiments about radial heavy oil displacement with large scale sand-pack model are needed. In this experimental study, seven groups of experiment are carried out: (1) using sand-pack model to learn the flow pattern of radial flow and compare with linear model and a quarter five spots model; (2) using sand-pack model to study the impact of injection rates of displacing water and viscosity of displaced oil under room temperature and pressure. Four kinds of oil samples with different viscosity (853.9cp, 2946cp, 8082cp, 32080cp) are chosen and the injection rate of displacing fluid varies from 0.01cc/min to 0.5cc/min (0.01cc/min, 0.05cc/min, 0.1cc/min and 0.5cc/min). The results of the experiment illustrate that the flow pattern of viscous fingering in the radial model can be divided into three stages: rapid fingering generation and growth, fingering combination and approximately stable displacement. During the process of displacement, there are also two types of fingering combinations: bottom to top combination and surrounding combination. Surrounding combination also can be divided into the incomplete and complete surrounding combination. The main reason for different flow patterns in the different experiments is discussed. In addition, the effect of injection rate and viscosity is analyzed based on experimental study. The conclusion is that both of injection rate and viscosity can influence the generation and growth of viscous fingering. However, for a specific regression equation between viscosity or injection rate with viscous fingering, more groups of the experiment are needed.