CMCs and the closely related PACs are vital components for reducing fluid loss. Depending on the grade, they can also make an important contribution to the viscosity and the shale inhibitive properties of the drilling fluid.

Polyanionic cellulose (PAC) has been developed to meet the increasing demand being places on polymers, which has pushed the adaptability of CMCs to their limits in certain circumstances.

PAC has been designed to take account of such factors as low solids content, clay stabilization, formation damage and temperature stability.

Akzo Nobel provides purified and semi-purified PAC grades.  All are suitable for use in any type of aqueous mud, from fresh to salt types.

GABROIL HV and GABROIL LV
Especially intended for those cases where economic aspects dominate and conditions are less severe.

Table of GABROIL grades

 

Product type	Product name	Active contents (%), dry basis (typical)	Fluid loss controller	Viscosifier	Shale inhibitor
PAC	Gabroil HV	70	****	****	****
PAC	Gabroil LV	70	***	**	**