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The type of oilfield drilling

1. Soft stratum drilling.
Soft stratum drilling should control drilling speed to avoid annular pack drilling solid phase make drill bit produce mud cake. 

2. Hard stratum drilling.

The mechanical drilling speed can't be controled. In the general condition, low viscosity, high water loss and low solid phase can improve the mechanical drilling rate. 

The ideal drilling fluid performance is soft stratum drilling and hard stratum drilling. High solid phase content, low drilling fluid cost, high mixing speed and strong carrying capacity. Hard stratum and small diameter well eyes. The drilling fluid performance is good of the drill bit, solid phase control efficiency is high and with the well performance of mineshaft.