«Onshore and offshore oil and gas well construction»

Planning of a methodology for determining plugging material parameters and well fluids properties to assess the time of maintaining the operational properties of the stone behind the casing string

UDC: 622.245.422
DOI: 10.33285/0130-3872-2022-11(359)-54-56

Authors:

¹ Samara State Technical University, Samara, Russia

Keywords: cement stone corrosion, hydrogen sulfide aggression, plugging material, corrosive active agent, formation porosity, plugging material permeability, plugging material adhesion, mathematical modeling

Annotation:

Previously, the authors of the article proposed options for calculating the reaction rate of a cement stone of a certain composition by stoichiometry during the period of hydration and exposure to a corrosive-active fluid, in particular, a low-concentration solution of hydrogen sulfide. The methodology is designed for fields, the productive layer (or significant interlayers) of which contain 6–23 %. As the main thesis, a position was proposed that determines that the hydration process begins from the moment of the cement clinker mixing, continues during the period of delivery to the annulus and during waiting on cement (WOC). And from the moment the grouting material enters the zone of the formation containing an aggressive fluid, the reaction of the substances constituting the grouting mixture with the solution of hydrogen sulfide begins with the simultaneously going process of the stone formation, i. e. hydration.

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