DRILLING FLUID ADDITIVE FOR REDUCING LOST CIRCULATION IN A DRILLING OPERATION

摘要

Generally, the present invention provides drilling fluid additives for reducing or controlling lost circulation in a drilling operation. The additives comprises particles. The particles comprise one or more solids in association a wax or waxy substance. A drilling fluid comprising a drilling fluid additive of the invention is also provided, as well as a method and use of the drilling fluid additive in a drilling operation to reduce or control lost circulation. Methods for manufacturing the drilling fluid additives are also described.