The RXSOL ORG Shale inhibitor is a liquid additive that acts as a clay hydration suppressant by intercalating and reducing the space between clay platelets so that water molecules will not penetrate and cause shale swelling. The RXSOL-81-8140-210 additive provides outstanding shale inhibition and minimizes dilution rates.

RXSOL-81-8140-210 inhibitor chemistry additionally provides a buffered pH in the 9.0–10.0 range, eliminating any required additions of caustic soda or potassium hydroxide. The recommended concentration is 1–4% by volume, depending on shale reactivity and the amount of shale in the interval to be drilled. RXSOL-81-8140-210 inhibitor concentrations should be monitored using a filtrate amine titration method. Premix dilution rates should be based on the depletion rates and the polyamine inhibitor concentration in the premix.

For reservoir, drill-in fluid applications such as in the Flopro * NT system, inhibitor compatibility with the reservoir should be evaluated through formation damage testing and filtrate/formation fluid compatibility testing.It is important to monitor the cuttings condition at the shakers during drilling operations. Cuttings should be firm and dry inside. Sticky and balled-up cuttings may indicate insufficient inhibition from a low RXSOL-81-8140-210 additive concentration. The initial mixture may contain more. RXSOL-81-8140-210 additive than specified in the mud program to act as a buffer against high consumption (e.g.,4–5% v/v).

RXSOL-81-8140-210 additive can also be used as a shale inhibitor in gravel pack fluids to maintain wellbore stability during high-rate water packs
. The concentration is usually 1–2% for this type of application.