QMAXVERT™: Family of Non-aqueous Drilling Fluids Systems


QMAXVERT D: Diesel-based drilling fluid

QMAXVERT CF: Clay-free non-aqueous drilling fluid system

QMAXVERT HT: Non-aqueous drilling fluid system for high temperature applications

QMAXVERT M: Mineral oil-based drilling fluid system

QMAXVERT M HT: Mineral oil-based drilling fluid system for high-temperature applications

QMAXVERT SYN: Conventional synthetic drilling fluid system

Non-aqueous fluids allow for the drilling of reactive formations more efficiently than water-based fluids, therefore, the QMAXVERT systems are a replacement for high-pressure, water-based fluids and other inhibited water-based fluids. The QMAXVERT systems are applicable where highly-reactive formations are present, and there are no environmental restrictions for the use of non-aqueous fluids. The QMAXVERT fluid systems allow drilling through troublesome shale without interfering with the internal structure of the rock, provided they have the correct salinity to avoid movement of water from the fluids to the shale. Superior lubrication properties make them ideal for drilling wells with complicated geometries and extended reach.

For significantly different formation pressures in a single interval, QMAXVERT fluids minimize the risk of differential sticking. They can be used to drill with a fluids density below the water gradient and are also recommended when high densities and temperatures are expected, and are ideal for offshore use in shallow applications where it is necessary to provide borehole stability across water-sensitive shale. The capillary pressures, convex meniscus in capillaries, and osmosis are responsible for the shale inhibition resulting in excellent borehole stability and retrieval of undispersed cuttings.

We Deliver, No Excuses


Multiple formulations such as clay-free, diesel-based, mineral oil-based, synthetic-based, and high-temperature

Ideal for drilling troublesome shales

Environmentally friendly and is recyclable and reusable

Excellent hole stability and easy to maintain


Non-Aqueous Systems






PropertyTypical RangeMin/Max Recommended
Fluid Weight, ppg (kg/m3)7.2 - 17.5 (860 - 2,100)< 17.5 (< 2,100)
Plastic Viscosity, cP2 - 40< 40
Yield Point, lb/100ft2 (Pa)10 - 50, (5 - 25)< 35 (< 17)
Gels, lb/100ft2 (Pa) 10”/10’ 6 - 10 / 8 - 17
(3 - 5 / 4 - 8)
As required
Excess Lime, ppb (kg/m3)2 - 6 (6 - 18)> 5.0 (>14)
Electrical Stability, Volts300 - 2,000> 800
HTHP Fluid Loss, cc/30min2.0 - 20.0< 10
LSYP, lb/100ft2 (Pa)6 - 12, 3 - 6> 8 (> 4) in deviated sections
WPS, mg/L Cl- 200K - 350K> 220K
Oil/Water Ratio60/40 - 100/0> 65/35