High Yield Drilling Clay

Definition - What does High Yield Drilling Clay mean?

High yield drilling clay is commercial drilling clay that is an intermediate between low yield clay and bentonite. It is specifically prepared for drilling operations. Ideally, it is prepared when low-yield calcium montmorillonite clay is peptized by adding bentonite. In some cases, bentonite isn’t needed. High, medium and low-yield are terms used to determine the quality of the clay and the volume produced by one sack of dry cement when mixed with water. A high yield drilling clay can produce 35 to 50 barrels per ton.

Petropedia explains High Yield Drilling Clay

Drilling clay is commercially prepared clay that is used during the drilling operations of an oil well. The term yield is used to determine the volume obtained by one sack of dry cement when it's mixed with water to prepare base slurry. There are three categories of the drilling clay that determine its quality – high, medium and low yield. A high yield drilling clay is a classification of a clay type that can yield anywhere from 30 to 50 barrels per ton. It is an intermediary between low yield clay and bentonite.

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