Alcohol Ethoxylate Nano Surfactant: Surface Tension and Compatibility with Acidizing Additives

This paper represents a study of the application of nano-surfactant in the acid stimulation and EOR operations. The performance of the novel surfactant was compared with commercial alcohol ethoxylate surfactants. Different acidizing additives were added to the surfactants under study to evaluate their behavior using surface tension measurements. A negative behavior of the nano-surfactant with corrosion inhibitor, H2S scavenger, and iron control and reducing agents were observed. Regardless of the effect of these additives on the surfactant performance, the nano-surfactant still provides a better performance overall compared to commercial alcohol ethoxylate surfactants. Interfacial tension experiment of the nano-surfactant with condensate samples was performed giving an average IFT of 8 dynes/cm at 160 °F.

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Effect of Acidizing Additives on the Corrosion Rate of Retarded HCl Recipes

Almulhim,

Almoajil

2024

Day 3 Wed, February 14, 2024

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Retarded HCl acid treatment has been used as an effective method for enhancing hydrocarbons production from carbonate reservoirs by creating highly conductive channels. A thorough understanding of performance of the retarded HCl additives is essential to prevent or minimize incompatibility of acidizing additives in the treatment. The objective of this work is to highlight the effect of retarded HCl recipe additives (e.g. H2S scavenger) on corrosion rate and compare it to regular HCl recipes. The paper additionally discuss typical testing conducted with carbonate acidizing acid recipes to assess performance. HCl acid and inorganic/organic acid retarded agents were obtained for this study. Typical experimental testing were conducted to assess acid recipes includes (1) thermal compatibility up to 300°F to identify precipitation or sludge formation, (2) iron control testing to assess the capacity of the acid to keep iron in solution at pH of 4 up to 300°F, and (3) coreflood and CT scan testing to assess wormhole formation profile and precipitation. XRD, TGA, ESEM, and NMR experiments were conducted to analyze solids and precipitation. An autoclave reactor was used to conduct corrosion testing to assess the effect of acid recipe additives on the corrosion rate up to 300°F. The effect of acid additives on the corrosion rate of 15 wt% retarded HCl acid with divalent salt and chemical retarder was investigated. It has been observed that the use of H2S scavenger with the retarded acid recipes resulted in significant increase in corrosion rate from 0.05 to 0.10 lb/ft2. The corrosion testing results indicated the EDTA-based chelating agent slightly increased the corrosion rate of the retarded acid recipe. However, the significant increase in corrosion rate was due to the presence of H2S scavenger and large amount of MgCl2 in the HCl recipe. H2S scavenger can be used in this retarded acid recipe. Alternatively, during acidizing operation of H2S scavenger pill can be used as spacers before and the pumping of the retarded acid.

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Alcohol Ethoxylate Nano Surfactant: Surface Tension and Compatibility with Acidizing Additives

Cited by 3 publications

References 6 publications

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Evaluation of Novel Surfactant for Acid Stimulation and EOR Treatments

Effect of Acidizing Additives on the Corrosion Rate of Retarded HCl Recipes

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