Nanocomposite hydrogels adsorption: Experimental investigation and performance on sandstone core

Rajaee, Samira; Salehi, Mahsa Baghban; Moghadam, Asefe Mousavi; Sefti, Mohsen Vafaie; Mohammadi, Shabnam

doi:10.1016/j.petrol.2017.08.034

Cited by 13 publications

(13 citation statements)

References 16 publications

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“…Although the addition of clay to the gelant formulation increased the gelation time, the thermal stability and the syneresis resistance of the composite hydrogel, when added above a certain concentration (1.6 wt %) the proper dispersion of the clay particles between polymer chains did not take place [23,54].…”

Section: Resultsmentioning

confidence: 99%

Gelation Kinetics of Hydrogels Based on Acrylamide–AMPS–NVP Terpolymer, Bentonite, and Polyethylenimine for Conformance Control of Oil Reservoirs

Tessarolli

Souza

Gomes

et al. 2019

Gels

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Relatively smaller volumes of gelling systems had been used to address conformance problems located near the wellbore in oil reservoirs with harsh temperature and salinity conditions. These gelling systems were formulated with high concentrations of low-molecular-weight acrylamide-based polymers crosslinked with polyethylenimine (PEI). However, for in-depth conformance control, in which large gelant volumes and long gelation times were required, lower-base polymer loadings were necessary to ensure the economic feasibility of the treatment. In this study, a gelling system with high-molecular weight 2-acrylamido-2-methylpropane sulfonic acid (AMPS), N-vinyl-2-pyrrolidone (NVP), acrylamide terpolymer, and PEI, with the addition of bentonite as a filler, was formulated. The influence of the gelant formulation and reservoir conditions on the gelation kinetics and final gel strength of the system was investigated through bottle tests and rheological tests. The addition of clay in the formulation increased the gelation time, thermal stability, and syneresis resistance, and slightly improved the final gel strength. Furthermore, samples prepared with polymer and PEI concentrations below 1 wt %, natural bentonite, and PEI with molecular weight of 70,000 kg/kmol and pH of 11: (i) presented good injectivity and propagation parameters (pseudoplastic behavior and viscosity ~25 mPa·s); (ii) showed suitable gelation times for near wellbore (~5 h) or far wellbore (~21 h) treatments; and (iii) formed strong composite hydrogels (equilibrium complex modulus ~10–20 Pa and Sydansk code G to H) with low syneresis and good long-term stability (~3 to 6 months) under harsh conditions. Therefore, the use of high-molecular-weight base polymer and low-cost clay as active filler seems promising to improve the cost-effectiveness of gelling systems for in-depth conformance treatments under harsh conditions of temperature and salinity/hardness.

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Section: Resultsmentioning

confidence: 99%

Gelation Kinetics of Hydrogels Based on Acrylamide–AMPS–NVP Terpolymer, Bentonite, and Polyethylenimine for Conformance Control of Oil Reservoirs

Tessarolli

Souza

Gomes

et al. 2019

Gels

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“…O gel é um sistema semi-sólido hidrofílico oriundo de polímeros que compõem uma estrutura em forma de rede tridimensional, a qual engloba um constituinte líquido (água), responsável pelo seu caráter elástico (RATHOD;MEHTA, 2015).…”

Section: Hidrogéis Para Controle De Conformidade Em Reservatórios De unclassified

“…As camadas destes materiais possuem uma considerável superfície de contato, o que torna o seu uso altamente atraente em dispersões poliméricas, gerando nanocompósitos com propriedades mecânicas melhoradas (TONGWA et al, 2012;RAJAEE et al, 2017;MOURYCOVA et al, 2018) e, também, maior estabilidade térmica (LIANG et al, 2000;MAHTO, 2017).…”

Section: Hidrogéis Nanocompósitos De Argilasunclassified

“…Neste caso, estas partículas são formadas por frações de moléculas aromáticas e alifáticas extraídas do petróleo bruto por técnicas de solubilidades, onde são pouco solúveis em solventes n-alcanos de baixo número de carbono, mas solúveis em hidrocarbonetos aromáticos, tais como tolueno e benzeno (ZUO et al, 2019). Suas propriedades e comportamento ainda não são completamente elucidadas, no entanto apresentam uma alta capacidade de agregação que é justificada pela diversidade de interações que suas estruturas permitem realizar, tais como: ligações hidrogênio, ligações eletroestáticas, ligações Van der Waals, interações π-π entre núcleos aromáticos, dentre outras (QUINTERO et al, 2007).…”

Section: Outros Hidrogéis Compósitosunclassified

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Hidrogéis Compósitos Poliméricos Com Possível Aplicação No Controle De Permeabilidade Em Reservatórios De Petróleo: Uma Revisão.

Pereira¹,

Oliveira²,

Mansur³

2019

REPECT

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No cenário energético mundial, as companhias petrolíferas exibem enormes gastos com tecnologias em busca de novas regiões para exploração de petróleo. Portanto, prolongar o tempo de operação nos reservatórios já existentes se tornou uma boa alternativa para atender a demanda de óleo e controlar as adversidades geradas pelas operações de baixa eficiência. Para isso, a técnica de controle de conformidade vem sendo muito discutida no intuito de melhorar a eficiência de varrido e diminuir a água de produção indesejada. Dentre os métodos químicos existentes, os géis poliméricos exibem a capacidade de bloquear as regiões fraturadas ou heterogêneas presentes em reservatórios com problemas de permeabilidade. No entanto, a autonomia destes hidrogéis ainda não foi completamente estabelecida por conta das drásticas condições encontradas nesses reservatórios. Neste contexto, agentes de reforço vêm sendo utilizados para a elaboração de hidrogéis poliméricos compósitos, os quais buscam melhorar as propriedades frente aos sistemas convencionais. Dentre os sistemas de reforço estão: nanosílica, argila, nanotubos de carbono, cinzas volantes de carvão, partículas de asfaltenos, nanocristais de celulose, óxido de grafeno, dentre outras. No geral, a presença destes componentes contribui de maneira semelhante, portanto deve-se considerar o custo e, principalmente, o uso de materiais ecológicos não prejudiciais ao meio-ambiente.

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“…The sealing polymer gel could, in principle, act as a porosity filler material that completely blocks pores of reservoir rock and stops fluids from flowing . In contrast, RPM is a polymer or weak polymer gel that adsorbs onto the surface of pore spaces and/or rents in pore throats. − RPMs are capable of selectively reducing relative permeability to water with little or no effect on oil flow. − The RPM selective blocking mechanisms on fluid phases are still a matter of debate. Many researchers have indicated that a wall effect, as shown in Figure.…”

Section: Introductionmentioning

confidence: 99%

Novel Relative Permeability Modifier using Polymer Grafted Nanoclay

2020

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One of the major challenges in the upstream oil and gas industry is to control and reduce high water production from a large number of oil wells. A relative permeability modifier (RPM) has been proven to offer a potential solution for excessive water production at core and field scales. A good RPM must be of a cost-effective and simple agent that could easily be prepared in the field to control water production without requiring major workover equipment. This paper discusses the performance of a newly formulated grafted nanoclay (GN) for conformance control at high-temperature conditions and application as a permeability modifier. The interfacial tension (IFT) reduction and wettability change were quantified via pendant drop and contact angle measurements, respectively. Laboratory studies were performed using Berea and native sandstone cores to determine the effect GN on effective water and oil permeability. Experimental results obtained revealed that upon injection GN can immediately create a high flow resistance to the injected water. The regained water and oil permeability were 16% and 89%, respectively, after GN injection when the Berea core was used. A similar high resistance factor to water was obtained when a native core was used. Adsorption of GN on the substrate reduced the contact angle toward water-wetting combined with a reduction in IFT from 20.78 ± 1.48 mN/m between an oil–brine system to 8.67 ± 1.01 mN/m for an oil–GN system. These new results highlighted new insights for successful applications of GN to improve reservoir conformance in oil production wells.

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Nanocomposite hydrogels adsorption: Experimental investigation and performance on sandstone core

Cited by 13 publications

References 16 publications

Gelation Kinetics of Hydrogels Based on Acrylamide–AMPS–NVP Terpolymer, Bentonite, and Polyethylenimine for Conformance Control of Oil Reservoirs

Gelation Kinetics of Hydrogels Based on Acrylamide–AMPS–NVP Terpolymer, Bentonite, and Polyethylenimine for Conformance Control of Oil Reservoirs

Hidrogéis Compósitos Poliméricos Com Possível Aplicação No Controle De Permeabilidade Em Reservatórios De Petróleo: Uma Revisão.

Novel Relative Permeability Modifier using Polymer Grafted Nanoclay

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