Kick Tolerance

Kick tolerance refers to the maximum volume of kick that avwell can handle at a given kick intensity (degree of underbalance) while still being able to circulate the kick out using the Driller’s method, without compromising the weakest exposed formation.

In general, kick tolerance varies based on both the kick intensity and the type of influx fluid.

Kick Intensity

Kick intensity refers to the underbalance in the well when the kick occurs, typically measured in pounds per gallon (ppg). A swabbed-in kick has zero kick intensity. In well planning, the maximum anticipated kick intensity is the difference between the programmed mud weight and the maximum
anticipated mud weight.

Assumptions in Kick Tolerance Calculations

When calculating kick tolerance, several assumptions are often made:

– Kick Intensity and Tolerance:

Generally, the higher the kick intensity, the lower the kick tolerance.

– Weakest Formation:

Unless otherwise indicated, the weakest formation is assumed to be the one immediately below the shoe.

– Vertical Distance and Exposed Formations:

The greater the vertical distance from the top of the kick to the bottom of the weakest
formation, the smaller the kick tolerance will be.

Wells with fewer exposed formations tend to have higher kick tolerance.

– Casing Shoe Depth:

The deeper the casing shoe, the more likely the well will have a higher kick tolerance.

– Kick Location:

Unless data suggests otherwise, we assume the kick originates from the bottom and is located within the smallest annulus.

– Annular Clearance:

Smaller annular clearance leads to higher annular pressure, meaning slim-hole wells or wells
with large-diameter BHAs generally have lower kick tolerance.

– BHA Length:

The longer the BHA, the lower the kick tolerance.

– Type of Kick:

Kick tolerance calculations are typically based on gas kicks. The lighter the gas gradient,the lower the kick tolerance.

– Formation Pore Pressure:

The higher the formation pore pressure, the smaller the kick tolerance. If the actual pore pressure exceeds the expected value, the kick tolerance will be lower than initially calculated.

For more information on Kick Tolerance Calculations, read
the Addendum in my Well Control Manual, which may be purchased in the Catalogue section of this website at: https://learn-well-control.com/product/well-control-manual-by-edwin-ritchie/