A lost circulation material of ground Walnut is available in three grades, fine, medium, and coarse, ranging in size from 100 mesh to 6 mesh.
Used as a lost circulation material or bridging agent due to its granular nature. Walnut is chemically inert and may be added to any mud system.
Walnut is also used as a drag reducer in deviated holes. When circulated past the tight hole section immediately prior to a trip, the irregular particles are embedded in the filter cake and act as bearings to reduce the hole drag.
