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Anionic surfactants used in oilfield
Release Date：2015-5-5 Source：xiashundong Views：1202
Anionic surfactants, i.e. when all dissolved in water, to generate anionic ionizable ionic surfactants, anionic surfactants known. It is divided into two categories: one is salt-based anionic surfactants, such as carboxylic acid salt type (R-COONa) and sulfonate (R-SO3Na) an active agent, they consist of organic acid and metal ions. Second, ester salt type anionic surfactants, such as sulfate type (R-OSO3Na) and phosphate salt type (R-OPO3Na2) an active agent, their esters molecule structure, but also the structure of the salt. Anionic surfactants in oil field applications, such as the application of it in other industrial sectors, as is the application of the oldest, most usage, and the most extensive use of industrial sections of a surfactant. Anionic surfactants in industrial oil drilling, oil and gas gathering and transportation and other processes, are widely used.
application and development drilling process
Anionic surfactants drilling in oil drilling process, the entire process of cementing and completion varying degrees of application.
In the drilling process, the drilling fluid in order to improve wettability, stability and resistance to high temperatures, reduce drilling fluid density, fluid loss and skin friction, prevent sticking sticking widely used contaminated drilling fluids, usually mixed with 5% to 20% oil, such as crude oil, diesel oil, or the like to form an oil-in-water emulsion. When playing a well formulated within 3000M contaminated drilling fluids, can be used directly as sodium carboxymethyl cellulose, tannic acid sodium salt and iron-chromium lignin sulfonate drilling fluid. Because they are slightly larger than the hydrophilic lipophilic, is anionic surfactant class; longer contains naphthenic oils, alkali treatment by drilling fluid into sodium naphthenic acid, is also an oil-anionic emulsifier, it is not necessary to add other emulsifiers. When playing deep and deviated drilling fluids formulated contaminated, you must add other emulsifiers, commonly used in drilling oil in water emulsifier has a n-alkyl (C10 ~ C20) sulfonate, alkyl benzene sulfonate and so on. It is resistant to high temperatures, leak-proof and salt, often using an oil-in-water drilling fluid, commonly used in the case of anionic emulsifier surfactants are calcium stearate, aluminum stearate and oleic acid and calcium.
When the low-pressure reservoir drilling, general formulation and use foam drilling to reduce drilling fluid density, reservoir protection. As foaming anionic surfactants long chain n-sodium salt of a fatty acid, alkyl sulfonates and alkyl sulfonates. In contrast, during the drilling process, the drilling fluid invasion by air density decreases; invaded by oil, due to natural emulsifiers and emulsifier plus the presence or sulfonated products used in the drilling fluid treatment agent, can reduce foam drilling fluid the density. These conditions must be timely defoaming using a defoaming agent, is anionic surfactant defoamers aluminum stearate.
application and development drilling process
Anionic surfactants drilling in oil drilling process, the entire process of cementing and completion varying degrees of application.
In the drilling process, the drilling fluid in order to improve wettability, stability and resistance to high temperatures, reduce drilling fluid density, fluid loss and skin friction, prevent sticking sticking widely used contaminated drilling fluids, usually mixed with 5% to 20% oil, such as crude oil, diesel oil, or the like to form an oil-in-water emulsion. When playing a well formulated within 3000M contaminated drilling fluids, can be used directly as sodium carboxymethyl cellulose, tannic acid sodium salt and iron-chromium lignin sulfonate drilling fluid. Because they are slightly larger than the hydrophilic lipophilic, is anionic surfactant class; longer contains naphthenic oils, alkali treatment by drilling fluid into sodium naphthenic acid, is also an oil-anionic emulsifier, it is not necessary to add other emulsifiers. When playing deep and deviated drilling fluids formulated contaminated, you must add other emulsifiers, commonly used in drilling oil in water emulsifier has a n-alkyl (C10 ~ C20) sulfonate, alkyl benzene sulfonate and so on. It is resistant to high temperatures, leak-proof and salt, often using an oil-in-water drilling fluid, commonly used in the case of anionic emulsifier surfactants are calcium stearate, aluminum stearate and oleic acid and calcium.
When the low-pressure reservoir drilling, general formulation and use foam drilling to reduce drilling fluid density, reservoir protection. As foaming anionic surfactants long chain n-sodium salt of a fatty acid, alkyl sulfonates and alkyl sulfonates. In contrast, during the drilling process, the drilling fluid invasion by air density decreases; invaded by oil, due to natural emulsifiers and emulsifier plus the presence or sulfonated products used in the drilling fluid treatment agent, can reduce foam drilling fluid the density. These conditions must be timely defoaming using a defoaming agent, is anionic surfactant defoamers aluminum stearate.