Examining Epoxy-based Nanocomposites in Wellbore Seal Repair for Effective CO2 Sequestration

Genedy, Moneeb; Stormont, John C.; Matteo, Edward N; Taha, Mahmoud Reda

doi:10.1016/j.egypro.2014.11.612

Cited by 19 publications

(11 citation statements)

References 20 publications

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“…PCNC-2.0 and PCNC-0.5 reached a significant 2.5% strain at failure proving a high strength high strain material with a failure strain about one order of magnitude of strain at failure of normal concrete. The stress-strain diagrams were used to calculate the tensile strength, the strain at failure, and PC toughness using Equation (1). Figure 7 shows the decrease of tensile strength with the incorporation of MWCNTs.…”

Section: Flowabilitymentioning

confidence: 99%

“…In the last decade, nanomaterials have been suggested as an alternative material to improve the mechanical and fracture characteristics of polymer composites [1][2][3][4][5]. Carbon nanotubes and specifically multi-walled carbon nanotubes (MWCNTs) have been the most common material used to improve fracture toughness of polymer composites.…”

Section: Introductionmentioning

confidence: 99%

“…PC is also commonly used in bridge deck overlays, manholes and has been recently suggested as a repair material for abandoned oil wells [1]. PC is produced by combining a polymer material (typically a thermoset polymer) with aggregate filler.…”

Section: Introductionmentioning

confidence: 99%

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Improving Fracture Toughness of Polymer Concrete Using MWCNTs

Douba¹,

Genedy²,

Tarefder³

et al. 2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Polymer concrete (PC) are used in bridge deck overlays due to its superior durability specifically freeze-thaw and corrosion resistance. The excellent durability of PC is related to its impermeable microstructure and good bond to concrete or steel substrates. However, there is an increasing need to improve PC resistance to crack propagation (fracture toughness) to enhance its fatigue resistance and extend its service life. Researchers showed that objective becomes possible using dispersed chopped synthetic fibers (6-12 mm long). However, this approach was criticized for its dramatic impact on PC flowability. Here we suggest improving fracture toughness of PC using Multi-Walled Carbon Nanotubes (MWCNTs).PC mixes were produced using epoxy and standard aggregate with varying contents of MWCNTs being: 0 (Neat), 0.5, 1.0, 1.5 and 2.0 wt.% by weight of epoxy. Flowability of PC incorporating MWCNTs was tested. The tensile strength of PC incorporating MWCNTs was evaluated using direct tension test. A closed loop notched beam three-point bending test fracture test was used to evaluate fracture toughness of PC. The crack mouth opening displacement (CMOD) clip gage was used to provide feedback. The inverse analysis approach was used to extract the bilinear stress-crack opening displacement relation and calculate the fracture toughness (GF) of PC with and without MWCNTs. It is shown that MWCNTs significantly improves the fracture toughness and toughness of PC without significantly impacting its flowability. Microstructural analysis using Fourier Transform Infrared Analysis (FTIR) of polymer used to produce PC explains the effect of incorporating MWCNTs.

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Section: Flowabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improving Fracture Toughness of Polymer Concrete Using MWCNTs

Douba¹,

Genedy²,

Tarefder³

et al. 2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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“…Zhai et al, (2006) reported improved bond between polymer matrices and metallic surfaces when nanomaterials were dispersed in the polymer matrix. Our prior investigations showed that Novolac epoxy incorporating ANPs significantly improved the bond strength of the cement-steel interface (Genedy et al, 2014).…”

Section: Fig 1 Schematic Representation Of Zonal Isolation and Potementioning

confidence: 91%

A new polymer nanocomposite repair material for restoring wellbore seal integrity

Genedy

Kandil

Matteo

et al. 2017

International Journal of Greenhouse Gas Control

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Seal integrity of functional oil wells and abandoned wellbores used for CO 2 subsequent storage has become of significant interest with the oil and gas leaks worldwide. This is attributed to the fact that wellbores intersecting geographical formations contain potential leakage pathways. One of the critical leakage pathways is the cement-shale interface. In this paper, we examine the efficiency of a new polymer nanocomposite repair material that can be injected for sealing micro annulus in wellbores. The bond strength and microstructure of the interface of Type G oil well cement (reference), microfine cement, Novolac epoxy incorporating Neat, 0.25%, 0.5%, and 1.0% Aluminum Nanoparticles (ANPs) with shale is investigated. Interfacial bond strength testing shows that injected microfine cement repair has considerably low bond strength, while ANPs-epoxy nanocomposites have a bond strength that is an order of magnitude higher than cement. Microscopic investigations of the interface show that micro annulus interfacial cracks with widths up to 40 m were observed at the cement-shale interface while these cracks were absent at the cement-epoxy-shale interface. Fourier Transform Infrared and Dynamic mechanical analysis measurements showed that ANPs improve interfacial bond by limiting epoxy crosslinking, and therefore allowing epoxy to form robust bonds with cement and shale.

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“…Addition of polymers to cement paste can be considered an alternate method to reduce the effects of the carbonation process, since literature reports improvements in mechanical and chemical properties of cement‐based materials containing polymeric admixtures . Epoxy resins are a class of thermoset materials widely used as polymer composite matrices because of their high mechanical and adhesion characteristics, effective electrical insulation, chemical and solvent resistance, relatively low shrinkage during curing, low toxicity and cost as well as ease in processing .…”

Section: Introductionmentioning

confidence: 99%

Chemical degradation of reinforced epoxy‐cement composites under CO₂‐rich environments

et al. 2017

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Long‐term wellbore integrity is crucial to prevent leakage of CO2 and to ensure performance and safety of carbon geologic storage. One of the concerns is the degradation of Portland cement due to its exposure to CO2. In this study, Portland cement paste composed of three reinforced‐epoxy resins (talc, agalmatolite, and montmorillonite clay as filler) was compared to unmodified cement paste with respect to CO2 resistance. CO2 degradation experiments were conducted with aqueous CO2 at elevated pressure (50 bar) and temperature (70°C) in order to mimic wellbore conditions. Epoxy cement composites were characterized by phenolphthalein test, field emission scanning electron microscopy, Fourier transform infrared spectroscopy, and mechanical compression test. The preparation method of the composites is the parameter likely to affect the CO2 resistance than curing conditions (natural and thermal). Addition of up to 5% of montmorillonite clay reinforced‐epoxy resins provides an improvement in CO2 resistance over unmodified Portland cement paste, showing to be a promising alternative to obtain suitable materials for use in wellbores in CO2 sequestration reservoirs. POLYM. COMPOS., 39:E2234–E2244, 2018. © 2017 Society of Plastics Engineers

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Examining Epoxy-based Nanocomposites in Wellbore Seal Repair for Effective CO2 Sequestration

Cited by 19 publications

References 20 publications

Improving Fracture Toughness of Polymer Concrete Using MWCNTs

Improving Fracture Toughness of Polymer Concrete Using MWCNTs

A new polymer nanocomposite repair material for restoring wellbore seal integrity

Chemical degradation of reinforced epoxy‐cement composites under CO₂‐rich environments

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Examining Epoxy-based Nanocomposites in Wellbore Seal Repair for Effective CO2 Sequestration

Cited by 19 publications

References 20 publications

Improving Fracture Toughness of Polymer Concrete Using MWCNTs

Improving Fracture Toughness of Polymer Concrete Using MWCNTs

A new polymer nanocomposite repair material for restoring wellbore seal integrity

Chemical degradation of reinforced epoxy‐cement composites under CO2‐rich environments

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Product

Resources

About

Chemical degradation of reinforced epoxy‐cement composites under CO₂‐rich environments