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Kill Mud weight is the density of the mud required to balance formation pressure during kill operation. The Kill Weight Mud can be calculated by: KWM = SIDPP/(0.052 × TVD) + OWM. where KWM = kill weight mud (ppg) SIDPP = shut-in drillpipe pressure (psi) TVD = true vertical depth (ft) OWM = original weight mud (ppg)
The principle of a well kill revolves around the influence of the weight of a fluid column and hence the pressure exerted at the wellbore's bottom. P = h g ρ {\displaystyle P=hg\rho } Where P is the pressure at a specific depth, h, within the column, g is the acceleration of gravity and ρ is the density of the fluid.
Mishandling mud at the surface accounts for many instances of insufficient fluid weight. Such as opening the wrong valve on the pump suction manifold and allowing a tank of lightweight fluid to be pumped; bumping the water valve so more is added than intended; washing off shale shakers; or clean-up operations. All of these can affect mud weight.
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Drilling fluids also support portion of drill-string or casing through buoyancy. Suspend in drilling fluid, buoyed by force equal to weight (or density) of mud, so reducing hook load at derrick. Weight that derrick can support limited by mechanical capacity, increase depth so weight of drill-string and casing increase.
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KMW – kill mud weight; KOEBD – gas converted to oil-equivalent at 6 million cubic feet = 1 thousand barrels; KOH – potassium hydroxide; KOP – kick-off point (directional drilling) KOP – kick-off plug; KP – kilometre post; KRP – kill rate pressure; KT – kill truck; KLPD- kiloliters per day