«Onshore and offshore oil and gas well construction»

The combined use of inhibitors of organic and inorganic types for drilling wells in the intervals of clay rocks occurrence

UDC: 622.24.5
DOI: 10.33285/0130-3872-2022-11(359)-38-42

Authors:

¹ Samara State Technical University, Samara, Russia

Keywords: clay rocks, swelling, wellbore stability, clay hydration inhibitors

Annotation:

Most of the technological complications that arise in the process of drilling a well are associated with the presence of clay deposits in the section. The drilling fluid interaction with clays hales is the main factor affecting the stability of the wellbore walls. The walls Erosion causes the formation of caverns, caving and sliding of unconsolidated loose rocks. In practice, the most used clay inhibitors are salt solutions, in particular, potassium chloride. Its mechanism is based on the penetration of potassium ions into the interlayer space of clays, causing a wedging effect. Such a mechanism makes it possible to prevent the hydration of clays, but leads to the dispersion of clay particles in the solution. As a result, high salt concentrations during long-term exposure lead to destabilization of the well walls. This problem solution requires selecting of a drilling fluid alternative formulation with improved inhibitory properties that ensures the stability of the wellbore during drilling.

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