Corrosion in drilling and well stimulation

Acidizing is the oldest and most commonly used technique for stimulating oil and gas wells.1 10 The primary purpose of an acid treatment is to dissolve rock or other plugging solids and the choice of acid depends on  

In common with any acidification the temperature, acid concentration, amount of acid, velocity of injection, viscosity of acid and fluid loss properties of formation have profound effects on the reaction rate. 

Acidizing involves treatment with either mineral acids such as HC1 or HF or organic acids such as acetic or formic acid. The acids are used in combination with inhibitors. 

The general reactions involved are 2HC1 + CaC03 CaCl2 + H20 + C02 (1) 

The various types of acidizing and other additions are detailed below  

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