Performance Comparison of New Combinations of Acids with Mud Acid in  Sandstone Acidizing

Shafiq, Mian Umer; Shuker, Muhannad Talib; Kyaw, Aung Ko Ko

doi:10.19026/rjaset.7.258

Cited by 8 publications

(6 citation statements)

References 5 publications

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“…production or recovery of hydrocarbons from depleted wells. In this practice, hydrochloric acid solution in the concentration range of 15-32% (depending on whether the formation rock is made of sandstone or limestone) is force down a well bore to etch the formation rocks and create larger flow channels [1][2][3][4]. As it is known, HCl is corrosive hence corrosion of oil well metallic structures is inevitable.…”

mentioning

confidence: 99%

Myristic acid based imidazoline derivative as effective corrosion inhibitor for steel in 15% HCl medium

Solomon

Umoren

Quraishi

et al. 2019

Journal of Colloid and Interface Science

203

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mentioning

confidence: 99%

Myristic acid based imidazoline derivative as effective corrosion inhibitor for steel in 15% HCl medium

Solomon

Umoren

Quraishi

et al. 2019

Journal of Colloid and Interface Science

203

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“…The research group in recent years led by Shafiq et al presented multiple experimentations using various acid combinations (Shafiq et al 2013b(Shafiq et al , 2014Shafiq and Shuker 2013;Shafiq et al 2015;Shafiq and Ben Mahmud 2016). The acid combinations tested by the authors included a mixture of orthophosphoric (H 3 PO 4 ) acid and HF; fluoroboric (HBF 4 ) acid and HCOOH; and HCOOH and HF.…”

Section: Retarded Acids and Organic Acidsmentioning

confidence: 99%

A preliminary screening and characterization of suitable acids for sandstone matrix acidizing technique: a comprehensive review

Leong

Mahmud

2018

J Petrol Explor Prod Technol

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Matrix acidizing is a broadly developed technique in sandstone stimulation to improve the permeability and porosity of a bottom-hole well. The most popular acid used is mud acid (HF-HCl). It is a mixture of hydrofluoric acid and hydrochloric acid. However, one of the conventional problems in sandstone acidizing is that mud acid faces significant issues at high temperature such as rapid rate of reaction, resulting in early acid consumption. This downside has given a negative impact to sandstone acidizing as it will result in not only permeability reduction, but can even extend to acid treatment failure. So, the aim of this study is to provide a preliminary screening and comparison of different acids based on the literature to optimize the acid selection, and targeting various temperatures of sandstone environment. This paper has comprehensively reviewed the experimental works using different acids to understand the chemical reactions and transport properties of acid in sandstone environment. The results obtained indicated that fluoroboric acid (HBF 4) could be useful in enhancing the sandstone acidizing process, although more studies are still required to consolidate this conclusion. HBF 4 is well known as a low damaging acid for sandstone acidizing due to its slow hydrolytic reaction to produce HF. This would allow deeper penetration of the acid into the sandstone formation at a slower rate, resulting in higher porosity and permeability enhancement. Nevertheless, little is known about the effective temperature working range for a successful treatment. Considering the pros and cons of different acids, particularly those which are associated with HF and HBF 4 , it is recommended to perform a comprehensive analysis to determine the optimum temperature range and effective working window for sandstone acidizing before treatment operation. Prior to sandstone acid stimulation, it is essential to predict the feasibility of acid selected by integrating the effects of temperature, acid concentration and injection rate. Therefore, this manuscript has thrown light into the research significance of further studies.

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“…In comparison with mud acid, phosphonic-based HF acid system shows significantly better performance of permeability enhancement of 177.86% at 300°F. Shafiq et al (2015), Shafiq and Mahmud (2016) and Shafiq et al (2014) performed experimental study with The Berea sandstone core samples were reacted with these acid combinations and analyzed in terms of the porosity, permeability, mineralogy, pH change and strength. According to the findings, although all these acid combinations can be used as the main acid in sandstone acidizing, yet the best acid combination is 3%HF:9%H 3 PO 4 .…”

Section: Fast Reactionmentioning

confidence: 99%

“…These acids also possessed some problems similar to mud acid like fast reaction rates and formation of precipitates. , Shafiq et al (2014) used organic mud acid to acidize sandstone formation in comparison with mud acid and presented their results in terms of acid pH value change. The results revealed that the pH value change after the acidizing is not much when organic mud acid is used as compared to standard mud acid, and this change is even less when fluoboric acid was added in place of hydrofluoric acid.…”

Section: Organic-hf Systemmentioning

confidence: 99%

Sandstone matrix acidizing knowledge and future development

Shafiq

Mahmud

2017

J Petrol Explor Prod Technol

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To meet rising global demands for energy, the oil and gas industry continuously strives to develop innovative oilfield technologies. With the development of new enhanced oil recovery techniques, sandstone acidizing has been significantly developed to contribute to the petroleum industry. Different acid combinations have been applied to the formation, which result in minimizing the near wellbore damage and improving the well productivity. A combination of hydrofluoric acid and hydrochloric acid (HF:HCl) known as mud acid has gained attractiveness in improving the porosity and permeability of the reservoir formation. However, high-temperature matrix acidizing is now growing since most of the wells nowadays become deeper and hotter temperature reservoirs, with a temperature higher than 200°F. As a result, mud acid becomes corrosive, forms precipitates and reacts rapidly, which causes early consumption of acid, hence becoming less efficient due to high pH value. However, different acids have been developed to combat these problems where studies on retarded mud acids, organic-HF acids, emulsified acids, chelating agents have shown their effectiveness at different conditions. These acids proved to be alternative to mud acid in sandstone acidizing, but the reaction mechanism and experimental analysis have not yet been investigated. The paper critically reviews the sandstone acidizing mechanism with different acids, problems occurred during the application of different acids and explores the reasons when matrix stimulation is successful over fracturing. This paper also explores the future developing requirement for matrix acidizing treatments and new experimental techniques that can be useful for further development, particularly in developing new acids and acidizing techniques, which would provide better results and information of topology, morphology and mineral dissolution and the challenges associated with implementing these ''new'' technologies.

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Performance Comparison of New Combinations of Acids with Mud Acid in Sandstone Acidizing

Cited by 8 publications

References 5 publications

Myristic acid based imidazoline derivative as effective corrosion inhibitor for steel in 15% HCl medium

Myristic acid based imidazoline derivative as effective corrosion inhibitor for steel in 15% HCl medium

A preliminary screening and characterization of suitable acids for sandstone matrix acidizing technique: a comprehensive review

Sandstone matrix acidizing knowledge and future development

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