Evaluation of the oil/water selective plugging performance of nano-polymer microspheres in fractured carbonate reservoirs

Water channeling of fractured carbonate rocks seriously restricts oil well production and is particularly prominent in the Troyes oilfield, located in the north of Kazakhstan. A nanometer particulate matter (PM) solution was used to evaluate the plugging ability of matrix and fractured core in a fra...

Full description

Saved in:
Bibliographic Details
Published in:Journal of Zhejiang University. A. Science 2019-09, Vol.20 (9), p.714-726
Main Authors: Wang, Jie, Zhou, Fu-jian, Li, Jun-jian, Yang, Kai, Zhang, Lu-feng, Fan, Fan
Format: Article
Language:English
Subjects:
Adsorptivity
Carbonate rocks
Channeling
Civil Engineering
Classical and Continuum Physics
Coefficients
Computer simulation
Dispersion
Engineering
Fractures
Industrial Chemistry/Chemical Engineering
Mechanical Engineering
Microspheres
Oil and gas fields
Oil field equipment
Oil fields
Particulate emissions
Particulate matter
Pharynx
Plugging
Scanning electron microscopy
Spectroscopy
Swelling
Technology assessment
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:Water channeling of fractured carbonate rocks seriously restricts oil well production and is particularly prominent in the Troyes oilfield, located in the north of Kazakhstan. A nanometer particulate matter (PM) solution was used to evaluate the plugging ability of matrix and fractured core in a fractured carbonate model. Results showed that PM had good dispersion and swelling ability in simulated formation water. The swelling rate reached more than 300% in 3 d. PM had a perfect deep plugging effect in both matrix core and fractured core. The residual resistance coefficient of matrix and fractured core after plugging reached between 3.29 and 5.88, and the plugging rate was between 69.58% and 83.01%. The higher the residual resistance coefficient, the higher the plugging rate. PM has a good selective plugging effect on oil/water. The oil/water selection coefficient R w/o was less than 1.0 and close to 0, mainly because of the different mechanisms of oil/water and PM. Scanning electron microscope (SEM) imaging results showed that the plugging mechanism of PM in the throat and fractures was manifested mainly in three aspects: adsorptive retention, mechanical trapping, and agglomeration plugging. The mechanism was further verified by energy disperse spectroscopy (EDS) elemental analysis technology.
ISSN:1673-565X
1862-1775
DOI:10.1631/jzus.A1900249