Asfasol - Inhibiting Additive for Drilling Fluid

Purpose

Asfasol is designed for the use as inhibitor of swelling clays. Asfasol contributes to formation on the borehole walls of thin and solid filter cake. Asfasol is also applied as colmatant of pores and micro-fissures. It enhances the stability of argillaceous rocks and prevents loosening of the structure, softening of the rock and its sloughing. It reduces water yield of drilling mud under conditions of high temperature (HTHP). It reduces dispergation of sludge particles in the process of drilling. It improves the lubricating properties of drilling mud. It is not subjected to bacterial decomposition. The action mechanism of sulfonated asphalt as inhibitor of clays in drilling mud is explained with the fact that electronegative sulfonated macromolecules fasten onto electropositive tips of clay particles. Therefore, a neutralization barrier which suppresses water absorption in clay.

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Physical and chemical properties

Property

Standard

Appearance

Powder-like substance of brown to black color.

Moisture content, %, max

pH value of 2% water solution, units

7-11

Recommendations to application

The optimal concentration of the chemical product in each case is determined taking into account the drilling conditions and regime. In order to select the proper concentration, it is recommended to contact Himprom representatives.