Experimental evaluation of designed and synthesized Alkaline-Surfactant-polymer (ASP) for chemical flooding in carbonate reservoirs

[Display omitted] •The novel hybrid co-polymer nanocomposite, cationic surfactant, and alkali synthesized for ASP flooding in slug-wise injection mode provided the highest incremental oil recovery.•An effective ASN formulation was developed that gives ultralow IFT for a HTHS carbonate reservoir.•The...

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Bibliographic Details
Published in:Fuel (Guildford) 2022-08, Vol.321, p.124090, Article 124090
Main Authors: Pashapouryeganeh, Farzad, Zargar, Ghasem, Kadkhodaie, Ali, Rabiee, Ahmad, Misaghi, Ali, Zakariaei, Seyed Jamal Sheikh
Format: Article
Language:English
Subjects:
Aluminum oxide
ASP Flooding
Capillary pressure
Carbonate reservoir
Chemical Enhanced Oil Recovery (CEOR)
Chemical precipitation
Chemical synthesis
Chemicals
Contact angle
Copolymers
Enhanced oil recovery
Entrapment
Evaluation
Flooding
Membrane permeability
Microemulsion
Nanocomposites
Nanoparticles
Oil
Oil and gas fields
Oil and gas production
Oil fields
Outcrops
Petroleum production
Polymers
Porous media
Reservoirs
Residual oil
Seawater
Secondary oil recovery
Shear strength
Surface tension
Surfactants
Synthesis
Wettability
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Summary:[Display omitted] •The novel hybrid co-polymer nanocomposite, cationic surfactant, and alkali synthesized for ASP flooding in slug-wise injection mode provided the highest incremental oil recovery.•An effective ASN formulation was developed that gives ultralow IFT for a HTHS carbonate reservoir.•The successful oil-wet carbonate rock wettability alteration (θ = 23.7°) obtained due to losal-ASN combination.•The residual oil saturation after the chemical flood was 0.046 in a reservoir core with cumulative oil recovery higher than 90%.•Core flood experiments were carried out using Karanj oil field core plugs and crude oil. More than half of the oil and gas resources of the world are hosted in carbonate reservoirs. Also, a total of 60% of their residual oil is left unswept during conventional primary and secondary oil recovery operations. The complexity of carbonate reservoirs due to relative weak water imbibition, undesired capillary forces, low permeability (less than 50mD), oil wetness and geochemical interactions in the presence of formation water high salinity causes precipitation of the injection chemicals resulting in clogging of pore throats and residual oil entrapment. Therefore, taking advantage of purposefully designed chemicals known as alkaline-surfactant-polymer (ASP) for enhanced oil recovery (EOR) applications rather than common commercial ASP materials for these challenging petroleum reservoirs is expected. In this research, the synthesized ASP combination was considered to improve the oil production mechanisms of the desired carbonate porous medium. Ultra-low interfacial tension about 1.6 × 10–3 has been achieved by Alkaline-Surfactant-Nano (ASN) synergistic formulation. Meanwhile, wettability alteration was evaluated by contact angle measurement. The contact angle was reduced from Θ = 155.2° (oil-wet) to Θ= 23.7° (water-wet) by the ASN combination. As well, the remarkable HTHS tolerable and shear resistance synthesized Co-polymer Nanocomposite was applied, and 10 times diluted seawater (losal) was chosen as chemicals compatible aqueous solvent for core flooding experiments. Thus, formulated ASP fluids were synergized by alumina nanoparticles at optimized concentrations of chemicals. Hence, this synthesized ASP is able to improve the residual oil production mechanism and lower the capillary pressure (Pc). 16 chemical flooding scenarios were run on Karanj oil field carbonate outcrop cores; the results of the four successful scenarios with the h
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2022.124090