Understand shoe pressure – Top of Gas Kick Below the Shoe

I would like to address about the shoe pressure concept while while circulating gas influx out of wellbore. This is the fist scenario – Top of the gas kick below the casing shoe

Understand shoe pressure - Top of Gas Kick Below the Shoe

The hydrostatic pressure above the casing shoe remains constantly because the fluid column is the same. If we don’t let casing pressure increase, the over all hydrostatic pressure in the well will decrease because gas expansion when it is being circulated. In order to maintain the bottom hole pressure constant, casing pressure will increase to balance the loss of hydrostatic pressure in the wellbore due to gas expansion.

Continue reading

Kick Tolerance

Kick Tolerance is the maximum volume of gas kick in barrels that we are able to successfully shut the well in and circulate the kick out of hole without breaking formation strength at shoe depth or overcoming the weakest anticipated facture pressure in wellbore.In order to calculate kick tolerance, we need to assume Kick Intensity (ppg), the depth that kick will happen, mostly is TD.

Continue reading