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Drilling EngineeringWell ControlCalculation record

Actual Gas Migration Rate from Casing Pressure Increase Calculator

RGM=(Pcsg2−Pcsg1)/Δt0.052MWRGM=\frac{(P_{csg2}-P_{csg1})/\Delta t}{0.052MW}

Enter the declared drilling engineering inputs below to solve RGM. Variable definitions, units, the default calculation, and the available source trail are included on this page.

Tabular solver

Inputs

Defaults provide a quick field-unit example for the equation.

4 variables

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Extended guidance in preparation

What is available in this record

This record provides the functioning calculator, formula, declared variables and units, a reproducible default result, and the available citation metadata. A separately written engineering interpretation has not yet been published for this calculation.

Formula reference

Formula, variables, and default calculation

RGM=(Pcsg2−Pcsg1)/Δt0.052MWRGM=\frac{(P_{csg2}-P_{csg1})/\Delta t}{0.052MW}

Reproducible default result

With the default values shown below, the calculation returns RGM = 615.384615 ft/hr. Defaults demonstrate the implementation; they are not recommended field values.

P_csg_1psi

450

P_csg_2psi

650

dt_hrhr

0.5

MWppg

12.5

Input definitions

P_csg_1

psi

Initial Shut-In Casing Pressure

P_csg_2

psi

Later Shut-In Casing Pressure

dt_hr

hr

Elapsed Shut-In Time

MW

ppg

Mud Weight

Output definitions

RGM

ft/hr

Actual Gas Migration Rate

P_inc_rate

intermediatepsi/hr

Casing Pressure Increase Rate

MWG

intermediatepsi/ft

Mud Pressure Gradient

P_csg_2

psi

Later Shut-In Casing Pressure

dt_hr

hr

Elapsed Shut-In Time

Source and record status

Source metadata identifies the relationship implemented by the calculator. Check the cited edition, unit basis, and scope against the engineering case before operational use.

reviewed

DrillingFormulas.com actual gas migration rate; Drilling Manual gas percolation rate well-control example.

Open source reference