Basic functions of drilling fluid

Drilling mud additives

（1） Carrying suspending rock debris

The primary basic function of drilling fluid is to carry the rock debris that has been broken by the drill bit to the ground through its own circulation, to maintain wellbore cleanliness, ensure smooth tripping, ensure that the drill bit always contacts breaks new formations at the bottom of the well, without causing repeated cutting, maintain safe fast drilling. When connecting a single pipe, tripping out stopping circulation for some reason, the drilling fluid suspends the drilling cuttings in the well, preventing them sinking quickly preventing situations such as sand settling sticking.

（2） Stable wellbore balanced formation pressure

Stable wellbore stability wellbore rules are the basic conditions for achieving safe rapid drilling. A drilling fluid with good performance should be able to form a thin tough mud cake on the wellbore wall through the filtration effect of the liquid phase, in order to stabilize the drilled formation prevent the liquid phase invading the formation, reducing the degree of hydration, expansion, dispersion of shale. At the same time, during the drilling process, it is necessary to continuously adjust the density of the drilling fluid to balance the formation pressure prevent complex downhole situations such as wellbore collapse blowout.