If a well is not drilled in an oil field, it is about 8 tons. Because the depth of oil field drilling is very deep, there is no basis for reference. Water wells or experimental piling bentonite (drilling shallow wells). Bentonite is a clay mineral deposit with montmorillonite as the primary component. It has a certain water absorption capacity, can absorb water equivalent to 8 times its own volume, volume expansion is about 10~3O times, and is suspended and gelled in aqueous solution. During oil and gas drilling, mud should be used to cool the bit, remove debris, maintain the well wall and balance the ground pressure. Bentonite has good dispersion and large slurry output, so it is an ideal material for making drilling mud. The technical requirements for bentonite used as drilling mud are the analysis and moisture content of suspended biomass wet sieve. The important role of drilling bentonite in drilling makes its use very large. It is understood that about 8t bentonite is used for each well.