Terminology Of Well Control

B: baryta weight to be added to V (m3) of mud to increase the density of d1 to d2 (kg)

Br: barytage rate (kg / min)

Ci: number of strokes corresponding to the internal volume of the liner Vi

Ca: number of strokes corresponding to the total annular volume Va

Cd: number of strokes corresponding to the annular volume of the overdraft Vd

d1: initial density of the mud (drilling mud density)

d2: intermediate mud density in case of heavier multistage

dr: mud density required to put the well under control

deql: mud density balancing the pore pressure

deqv: effective density of the mud in the annulus.

dg: density (or density in kg / liter) of gas measured against water

dfrac: fracture density

Gfrac: fracture gradient of the fragile formation (bar / m)

Gp: pressure gradient expressed in bar / m

G: volume of the measured surface came after the pit closure (liter)

N: number of strokes corresponding to the drilling speed (strokes / min)

Nr: number of strokes corresponding to the control flow (strokes / min)

PAdm: maximum allowable pressure at the top of the annular space, closed well, corresponding to fracturing the fragile period (Bars)

Pamax: head pressure of the annular space to the arrival of the surface of gas cap (Bars)

PapG: static pressure at the top of the annular space full of gas (Bars)

Pcl: pressure drop control flow measured in the circuit (Bars)

Pc2: pressure drop control flow with mud d2 measured in the circuit (Bars)

Pcr: pressure drop control flow with mud dr measured in the circuit (Bars)

Pfond: pressure on the well bottom (Bars)

Ppores: fluid formation pressure (Bars)

Ph: hydrostatic pressure (Bars)

Pfrac: brittle fracture pressure at the point (Bars)

PR: traffic or discharge pressure (Bars)

PR1: Initial pressure control traffic flow with the density mud d1 (Bars)

PR2: Initial pressure control traffic flow with the density mud d2 (Bars)

RRP: final pressure control traffic flow with mud dr (Bars)

Ps: pressure the fragile point the shoe in general (Bars)

Psmax: maximum pressure sensitive period (Bars)

Pt1: settled pressure at the top of the stems, closed well after coming, with mud d1 (Bars)

Pa1: stabilized wellhead pressure of the annular space, closed well after coming, with mud d1 (Bars)

Q: drilling flow (liter / min)

Qr: control flow (liters / min)

Qu: Unit actual pump flow (liters / pulse)

Van: total volume of the annular space (m3)

V: internal volume of the drill string (m3)

Vd: discovered annulus volume (m3)

V: total volume of sludge including weighing in the trays (m3)

L: measured depth of the well (m)

Z: vertical depth of the well (m)

Ls: Fragile points measured depth (m)

Zs: Fragile vertical depth mark (m)

Heff: theoretical height of the effluent at the bottom (m)

Pha: hydrostatic pressure in the annulus (Bars)

Phi: hydrostatic pressure from within the liner (Bars)