From reaming to pilot bores, drilling fluid is required for a successful installation. It is important to understand common drilling fluid additives and the way that they work.
Most Common Drilling Fluid Additives to Consider
Polyanionic cellulose polymer drilling fluid additives should be used anytime you are working in a porous zone in loose ground, such as sand. PAC polymers help to prevent the loss of fluid downhole as well as oversaturation of the bore formation, which could cause the hole to collapse. It also works to lubricate the bore path as well as prevent bit balling.
For reactive shale and clays, partially hydrolyzed polyacrylamide polymers should be used. It will bond downhole with the outer layers of cutting and the ground material in order to prevent fluid from being absorbed and swelling. This will also help to keep it from sticking to tooling as well.
Additional Drilling Fluid Additives to Consider
High molecular weight polymers are ideal for gravel, sand, and cobble ground conditions. These drilling fluid additives increase gel strength, which makes it possible for the heavier cuttings to be flushed out of the bore path.
To keep your tooling clean and lubricate downhole, you will want to consider detergent additives. Xanthan gum boosts the drilling fluid viscosity but does not increase density.
When you are drilling through rock formations that are prone to chipping instead of cutting properly, a good option to consider is foam. The foam will help the chips float and be flushed from the path of the drill.
