Good drilling fluid starts with carefully mixing bentonite. The bentonite must be thoroughly mixed with water to produce a uniform drilling fluid. Insufficient mixing can cause lumps or an uneven mixture, making it harder to achieve the desired fluid properties.

Mixing involves more than adding bentonite

The correct mixing procedure depends on the products used. Bentonite, polymers and other additives may each have specific requirements for dosage, mixing sequence and hydration time.

There is therefore no single mixing sequence suitable for every drilling fluid system. Always follow the drilling fluid supplier’s recommendations and adapt the mixture to the project conditions.

Give the mixture time

Once added to water, bentonite needs time to hydrate. The time required depends on factors such as the product, water quality and temperature.

Do not assess the drilling fluid immediately after adding the bentonite. Allow sufficient time for mixing and hydration before checking whether the desired properties have been achieved.

Use the right amount

There is no standard quantity of bentonite per 1,000 litres suitable for every drilling operation. The required concentration depends on ground conditions, water quality, the drilling fluid products used and the requirements of the bore.

Measurements, such as a Marsh funnel test, can help you monitor the drilling fluid. However, target values must be established for the specific drilling fluid programme.

Maintain a consistent mixing process

A suitable mixing system makes it easy to add products gradually and circulate the fluid thoroughly. Monitor the mixing process and check that the powder is being properly incorporated into the fluid.

After mixing, clean the hopper and associated pipework according to the operating and maintenance instructions. This keeps the system ready for the next mixing cycle.

The aim is simple: to produce a uniform drilling fluid with the properties required for the bore. The equipment provides the mixing capacity; the exact formulation is adjusted to suit the drilling fluid products used and the project conditions.