«Proceedings of Gubkin University»

Acid compositions for high-temperature treatment of carbonate reservoirs during commissioning of gas condensate wells

UDC: 622.245.42:622.276.1+542.97
DOI: -

Authors:

¹ PermNIPIneft, Volgograd, Russian Federation

Keywords: acid composition (CS), carbonate reservoir, bottom-hole formation zone (PPZ), chelating agent, organic acids, hydrocarbon-based drilling mud filtrate

Annotation:

Results of laboratory investigations of acid compositions for high-temperature gas wellbore zone treatment are presented. Acid treatment is designed to increase permeability and wellbore cleaning from mud before well commissioning. Acid treatment of this object is characterized by high temperature in the contact zone of the injected acid composition and the rock (more than 90 °C), as a result of which “traditional” hydrochloric acid treatment cannot provide a sufficient degree of penetration of the acid composition, destroying the bottomhole zone due to the high reaction rate. Additional requirements are imposed on acid compositions under such conditions. Compositions on the basis of organic acids and chelating agents are the most effective due to the lowest initial velocity of limestone dissolution and high solvent capacity. Laboratory tests proved that chosen acid compositions meet process design requirements.

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