Development of enhanced nanocomposite preformed particle gels for conformance control in high-temperature and high-salinity oil reservoirs

Autor:	Romina Fajardo-Lopez, Fernando Barragán-Aroche, Horacio Reyes, Simón López-Ramírez, C. Duran-Valencia, Baojun Bai
Rok vydání:	2014
Předmět:	Nanocomposite Molar mass Materials science Polymers and Plastics chemistry.chemical_compound Monomer chemistry Polymerization Chemical engineering Ionic strength Polymer chemistry Bentonite Self-healing hydrogels Materials Chemistry Chemical stability
Zdroj:	Polymer Journal. 46:277-284
ISSN:	1349-0540 0032-3896
Popis:	In this paper, we describe the synthesis, characterization and evaluation of nanocomposite preformed particle gels (PPGs) for use as conformance control agents in high-temperature and high-salinity oil reservoirs. The chemical stability of conventional acrylamide (AM)-homopolymer-based PPGs was improved by incorporating an optimized ratio of new functional groups into their structure to withstand harsh reservoir conditions. The modified PPGs were synthesized via free radical crosslinking polymerization at room temperature using AM, vinylpyrrolidone (VP) and 2-acrylamido-2-methylpropane sulfonic sodium salt (AMPSNa) monomers and an N,N-methylenebis (acrylamide) (MBA) crosslinker. The mechanical properties of the PPGs were enhanced by adding a dispersion of modified bentonite (MB) to the formulation. The chemical and mechanical stabilities of the synthesized PPGs were evaluated at a high temperature (130 °C) and under high-salinity conditions using production water (with a TDS of 83 942.63 p.p.m.) and connate water (with a TDS of 254 873.09 p.p.m.), both of which were collected from an oil reservoir. The experimental results showed that PPGs prepared with 30 wt.% of a 1:1:1 molar mass ratio of AM, VP and AMPS monomers with 0.5 wt.% MBA and 2 wt.% MB exhibited the highest stability of the investigated PPGs under oil reservoir conditions. Conventional preformed particle gels (PPGs) of homo-polyacrylamide have been improved by incorporating an optimized ratio of functional groups, AMPS and NVP. The improved PPG shows acceptable viscoelastic properties, thermal and ionic strength stability when they are exposed and aged under high-temperature (130 °C) and high-salinity (225 000 p.p.m. of TDS) conditions. According to the experimental results obtained, these improved PPG can be used for water control purposes under harsh reservoir conditions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4c351d9b24663a976250c2503092c954 https://doi.org/10.1038/pj.2013.99 Zobrazit plný text záznamu