Скачать или смотреть Lost Circulation In Drilling(Oil & Gas well)

The reduction of flow in annulus above the loss can cause many other problems. Slow annular velocity lowers the carrying capacity of the mud. Cuttings may accumulate in low velocity region and fall back to the bottom when the pump stopped. This fall could cause pipe sticking.

The loss of mud into the formation may also lower

the mud level in well bore which will lower the

hydrostatic pressure in the hole. In shale sections,

this induced lesser wall support may cause

sloughing of shales which further may cause pipe

sticking. I other words It can cause wellbore

instability problems.

If hydrostatic pressure reduces against the permeable formations, the well may start kicking which is a very dangerous situation of lost circulation. If kick warning signs ignored & the kick fluid flow into the lost zone, this can definitely lead to an underground blowout, the worst situation for well control.

The benefits loss of maintaining circulation, such as obtaining good quality formation evaluation and achieving an effective primary cement bond on Casing.