Production and Evaluation of Hydroxypropyl Starch as a Viscosifying Agent for Enhanced Oil Recovery

In this study, starch was obtained from rice wastes and the maximum extraction yield was 90.95 %. Chemical modification reactions were carried out by hydroxypropylation to obtain a modified starch extract, named 005A, soluble in synthetic injection brine. Extract 005A had a modified starch concentra...

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Bibliographic Details
Published in:	ChemistrySelect (Weinheim) Vol. 9; no. 30
Main Authors:	Aguiar, Kelly Lúcia Nazareth Pinho, Sá Gomes, Karen, Silva Licht, Matheus Ferreira, Palermo, Luiz Carlos Magalhães, Mansur, Claudia Regina Elias
Format:	Journal Article
Language:	English
Published:	12-08-2024
Subjects:	Biopolymer flooding Carbonate reservoirs Enhanced oil recovery Hydroxypropylation Modified starch
Online Access:	Get full text
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Summary:	In this study, starch was obtained from rice wastes and the maximum extraction yield was 90.95 %. Chemical modification reactions were carried out by hydroxypropylation to obtain a modified starch extract, named 005A, soluble in synthetic injection brine. Extract 005A had a modified starch concentration of 1.24 %, with a pseudoplastic rheological profile and viscosities of 325.54 cP and 121.03 cP at temperatures of 25 and 60 °C, respectively. The application of extract 005A was evaluated by injectivity/filterability tests, which indicated a good filtration rate and viscosity loss of 3.81 % when passing the fluid through the filtering membrane. Stability tests indicated that the 005A extract had a viscosity loss of 21.35 %, at the temperature of 60 °C, after 60 days. The application of this extract enabled additional mineral oil recovery of 12.19 % in simulated core flooding tests. Therefore, the extract of hydroxypropyl starch is a promising viscosifying agent for Enhanced Oil Recovery (EOR) fluids. A modified starch extract was obtained through hydroxypropylation reactions in rice waste starch. This extract demonstrated solubility in injection brine, a pseudoplastic rheological behavior, and good viscosity. The extract showed a good filtration rate and stability at 60 °C, under 60 days. The application of this extract enabled an additional mineral oil recovery of 12.19 %, being promising for EOR.
ISSN:	2365-6549 2365-6549
DOI:	10.1002/slct.202400476