When should I add polymer to a bentonite mud?

After bentonite is fully hydrated — typically 10-20 minutes of circulation after the last bag is in. Adding polymer too early prevents bentonite from fully yielding and reduces viscosity instead of building it.

PHPA or PAC — which do I need?

PHPA is a clay inhibitor; it encapsulates reactive clay. PAC (polyanionic cellulose) is primarily a fluid-loss reducer; it thickens the filter cake. Most reactive-ground HDD muds use PHPA; deeper water wells with significant fluid loss often use PAC. The two work together in combined packages.

Do polymers work in salty water?

Some do. Standard PHPA loses effectiveness above a few hundred ppm chlorides; salt-tolerant polymer packages are available for brackish makeup water and coastal jobs. Ask the salesperson for your region if you expect salt-affected water.

Drilling Fluids · 21 SKUs

Polymer Additives

PHPA polymers, EZ MUD, and viscosifiers

Polymer additives extend a bentonite mud into ground that would otherwise eat the system alive. PHPA (partially hydrolyzed polyacrylamide) encapsulates clay particles so they do not swell, stick, and drag. Clay inhibitors reduce torque in shale and plastic clays. Foam-extenders thin the mud for air-rotary systems. Drillworx stocks the full additive pantry so a crew can tune mud to the formation rather than forcing a single base mix through every ground type.

Polymer selection starts with formation. For reactive clay and shale, a PHPA-based inhibitor earns its keep. For wellhead work, a biodegradable polymer keeps development water friendly to the aquifer. For HDD in hot ground or with long bores, a thermal-stable polymer package holds viscosity through the full circulation cycle.

A cheaper bentonite mix with the right polymer often outperforms a premium bentonite with no polymer at all. Polymer typically runs 1-3% of job cost and has outsized impact on pullback success.

Field guidance

When to use polymer additives

Reactive clay and shale

PHPA inhibitors prevent clay from swelling and sticking to the drill string. Add after bentonite is fully hydrated.

Brackish or salty makeup water

Salt-tolerant polymer packages hold viscosity in water that would flocculate standard bentonite.

Long bores where mud sits

Thermal-stable polymers keep mud alive through the full pull on 1000+ ft bores.

Air-rotary water-well drilling

Foam extenders let a smaller compressor lift cuttings from deeper wells without upsizing the rig.

Compatibility

Fitment & sizing

Base families: PHPA, PAC, biodegradable, foam-extender
Pairs with: High-yield bentonite gels, soda-ash conditioning
Typical dosage: 0.25 - 2 lb per 1000 gal, varies by product
Shelf life: Dry polymers: years when sealed; liquids vary

21 products

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