Kill fluid density for a workover
Kill fluid density from the reservoir pressure and the depth of the top perforations, with the overbalance required by the Kazakhstan industrial safety rules (item 874).
ρ_e = P_r / (g · H)ΔP = min(k · P_r, ΔP_max)ρ = (P_r + ΔP) / (g · H)ΔP_max = 1.5 MPa (H ≤ 1200 m), 2.5 MPa (H ≤ 2500 m), 3.5 MPa (H > 2500 m)The overbalance may not exceed 1.5 MPa (wells down to 1200 m), 2.5 MPa (down to 2500 m) and 3.5 MPa (deeper) — the cap is applied automatically. The kill pressure (hydrostatic plus dynamic) must stay below the fracture or loss pressure (item 875). Before the kill, keep two well volumes of kill fluid at the well (item 873) — see the well volumes calculator.
Source: Industrial safety rules for hazardous production facilities of the oil and gas industries of Kazakhstan (order of the Minister for Investment and Development No. 355 of 30.12.2014), items 873–875
Inputs
You can change a field's unit: the value is converted to the formula's units automatically.
From the latest survey (build-up, downhole gauge) or the static fluid level.
The top of the formation if it is not perforated.
Rules: 10–15 % for wells down to 1200 m, 5–10 % down to 2500 m, 4–7 % deeper.
Unit converter for this formulaPressure · Length · Density and °API · Pressure gradient and equivalent density · Fraction and percent
- MPa1
- kPa1,000
- bar10
- atm9.86923
- kgf/cm²10.1972
- mmHg7,500.62
- MPa(g)0.898675
- barg8.98675
- psi145.038
- psia145.038
- psig130.342
- ksi0.145038
psi and psia are absolute pressure; gauge units (barg, MPa(g), psig) are above atmospheric (101.325 kPa = 14.696 psi). Pressure differences in the formulas do not depend on this.
- ΔP — Overbalance on the formation–
- ΔP_max — Overbalance cap of the rules at this depth–
- ρ_e — Reservoir pressure equivalent density–
Results are engineering estimates from standard formulas; for design decisions check them against the codes, project documents and specialists' calculations. The formulas carried over from the original set are unchanged, and their errors are described in the notes.