Fracture granular

Some common flake-shaped LCMs consist of shredded cellophane and paper, mica (qv), rice hulls, cottonseed hulls, or laminated plastic. These materials He flat across the opening to be sealed or are wedged into an opening such as a fracture. Some are sufficiently strong to withstand considerable differential pressure, whereas others are weak and the seal may be broken easily. Weaker flake materials typically are used near the surface or in combination with fibrous or granular additives. 

Floss, n, (Metal.) pig raft, float, — blumiges —, white pig with granular fracture,... 

Kora-diebte, /. closeness of grain, -eisen, n. iron of granular fracture. 

A fluid loss additive is described that consists of granular starch composition and fine particulate mica [337]. An application comprises a fracturing fluid containing this additive. A method of fracturing a subterranean formation penetrated by a borehole comprises injecting into the borehole and into contact with the formation, at a rate and pressure sufficient to fracture the formation, a fracturing fluid containing the additive in an amount sufficient to provide fluid loss control. 

CELESTITE. The mineral celesiite (also known as celesTinc) is composed of stromium sulfate, SrSOj. occasionally with calcium and barium. It crystallizes in the orthorhombic syslem in tabular or prismatic crystals. More rarely it may he pyramidal or simply fibrous or granular. Two essentially perfect cleavages may be observed, one parallel to the hase. the other parallel to the prism. Its fracture is uneven hardness. 3-3,5 specific gravity, 3.97 luster, vitreous color, white, but may be slightly reddish or bluish transparent to translucent. 

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