Cello-Flake is a material of a coarse, fibrous or flaky composition used to form an impermeable barrier across a formation interface or perforation . Bridging materials are most commonly used when lost circulation occurs during drilling. They are also used in workover operations in preparation for killing a well when the kill fluid is likely to be lost to the perforations. The selection of an appropriate bridging material is critical during workover operations since the barrier should be completely removed in preparation for placing the well back on production.

Cello-Flake is a type of lost-circulation material that is thin and flat in shape, with a large surface area. Flake LCM can be prepared in various sizes. It should be insoluble and inert to the mud system in which it is used. Its purpose is to seal off fluid loss zones in a well and help stop lost circulation . Mica flakes and pieces of plastic (cellophane) sheeting are commonly used. Often, granular, flake and fiber LCMs will be mixed into one LCM pill and pumped into the zone where losses are occurring.

Cello-Flake, also known as Cellophane Flake, is commonly used as a lost circulation additive or bridging material in cement to stop leaks to highly permeable and fractured formations.

Lost circulation is a lack of mud returning to the surface after being pumped down a well. Lost circulation occurs when the drill bit encounters natural fissures, fractures or caverns, and mud flows into the newly available space. Lost circulation may also be caused by applying more mud pressure (that

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Features of Cello- Flake
· Low density material provides an excellent
    bridging  property to help  seal-off lost  
    circulation zones.
· Does not chemically interfere with cement
    slurry, it is inert.
· Compatible with all API cements and most
    cement additives.