Shale inhibitor Supplier and Manufacturer


Shale inhibitor is a partially water soluble, water dispersible blend, containing sulfonated organic resins for water-base muds. It is used to aid in stabilizing shale sections, controlling solids dispersion and improving wall cake characteristics. Being partially soluble, SHALL INHIBITOR has the capability of plugging micro-fractured shales and sealing shales so that the hydrostatic overbalance from the fluid column is not transmitted to the pore pressure network of shale formations adjacent to the wellbore.


Properties    Value
Physical appearance    Black-to-brown powder
Specific Gravity    1.2 – 1.5
pH (2% solution)    9.1 – 9.5
SHALL INHIBITOR can be used in most waterbase muds. It is a free-flowing powder and can be added directly to the mud system through the mixing hopper. Unlike other shale control additives, it is not necessary to premix SHALL INHIBITOR with oil and it contains no surfactants. Normal concentrations of SHALL INHIBITOR range from 4 to 10 lb/bbl (11.4 to 28.5 kg/m3) for most applications.


SHALL INHIBITOR increases wellbore stability by:

Plugging micro-fractures and sealing shales.
Inhibiting swelling and water wetting of shales.
Reducing torque and drag.
Improving filter cake quality.
Reducing High-Temperature, High-Pressure (HTHP) fluid loss.


Triaxial testing was done by an independent laboratory to investigate the inhibitive effects of muds containing SHALL INHIBITOR. Figures 1 and 2 provide comparative results of triaxial testing done on a Golodrina shale with a simple bentonite/ Polyanionic Cellulose (PAC) system. With SHALL INHIBITOR the time-to-failure and the erosion rate were better than with standard sulfonated asphalt. Figures 3 and 4 demonstrate the same trend on Pierre shale with both a lignosulfonate and a Partially Hydrolyzed Polyacrylamide (PHPA) -base mud. In these tests the cores were exposed to the circulating fluid for only 100 minutes so that the erosion rate could be measured prior to core failure.

Figure 5 demonstrates SHALL INHIBITOR’s ability to reduce the HTHP fluid loss. SHALL INHIBITOR is roughly equivalent to standard sulfonated asphalt for reducing HTHP fluid loss. Figure 6 demonstrates SHALL INHIBITOR’s ability to improve lubricity by reducing the coefficient of friction in a simple bentonite slurry.

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