**WELLCONTROL**** CALCULATIONS**

**Kick Classification**

Kick while Drilling

Kick after Pump Shutdown

Swab Kick** **

**KILL METHODS**

- Driller’s Method

Two circulations:

Kick is circulated out using original mud weight

Kill mud is circulated

- Wait and Weight Method (Engineer’s Method)

Once circulation:

Kill mud is circulated to circulate out the kick

- Concurrent Method

Original mud is weighted incrementally in stages to the kill mud weight while the kick is circulated out.

- Volumetric Method
- Bullheading Method

**Kill Mud Weight**

Formation Pressure (psi) = 0.052 x original mud weight, ppg x vertical depth, ft + shut-in drillpipe pressure, psi

Kill mud weight (ppg) = original mud weight, ppg + (shut-in drillpipe pressure, psi /0.052 x vertical depth, ft) + overkill safety margin, ppg

** ****Initial Circulating Pressure**

Initial Circulating Pressure (ICP) = shut-in drillpipe pressure, psi + slow circulating pump pressure, psi + overkill pressure, psi

** ****Final Circulating Pressure**

Final Circulating Pressure (FCP) = slow circulating pump pressure, psi x (Kill mud weight (ppg)/ overkill safety margin, ppg)** **

**Length and Density of Kick**

Length of the kick, ft = pit gain, bbl /( annulus capacity behind drillcollar, bbl/ft)

For pit gain, bbl < annulus volume against drillcollar, bbl

Length of the kick, ft = length of the drillcollar, ft + (pit gain, bbl – annulus volume against drillcollar, bbl)/ annulus capacity behind drillpipe, bbl/ft

For pit gain, bbl > annulus volume against drillcollar, bbl

**Density of Kick**

Density of the Kick, ppg = initial mud weight, ppg – (initial stabilized drillpipe pressure, psi – initial stabilized casing pressure, psi)/(0.052 x Length of the kick, ft)

**Riser Margin**

Riser margin is = (drilling fluid gradient to control the formation pressure with riser, psi/ft x depth of the hole (TVD), ft – seawater gradient, psi/ft

seawater gradient, psi/ft x water depth, ft )/ (depth of the hole (TVD), ft – water depth, ft

- air gap, ft)
**Type of Kick**Oil and gas mixture 0.25 < density of kick < 0.3 psi/ftWater Kick 0.4 < density of kick psi/ft - Oil or condensate 0.3 < density of kick < 0.4psi/ft
- Gas Kick < 0.25 psi/ft