Sandstone matrix acidizing knowledge and future development
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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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Application of emulsified acids on sandstone formation at elevated temperature conditions: an experimental studyShafiq, M.; Chong, Y.; Ben Mahmud, Hisham; Hossain, Mofazzal; Rezaee, M. Reza; Testamanti, N. (2018)Emulsified acid has attracted considerable attention of the oil and gas industry due to its delayed nature that allows deeper penetration of acid into the formation which essentially facilitate further enhancing the well ...
A comparison and assessment of the modelling and simulation of the sandstone matrix acidizing process: A critical methodology studyLeong, V.; Ben Mahmud, H.; Law, Ming; Foo, H.; Tan, I. (2018)Sandstone matrix acidizing is a well stimulation technique to enhance the productivity of a reservoir formation. Numerous models had been developed in the past years for mud acid sandstone stimulation but little research ...
A preliminary screening and characterization of suitable acids for sandstone matrix acidizing technique: a comprehensive reviewLeong, V.; Ben Mahmud, Hisham (2018)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 ...