WellTesting.jl

Introduction.

This package is being designed among others to provide Petroleum Engineering tools in a modern programming language. This package is part of the project 7G which proposes to make basic but powerful engineering software packages that cover the main topics of the Oil and Gas development phases which could be applied to any case study by suitable engineers.

There are five topics in which the project is going to be focused on:

-Geoscience* (Current Package)
-Reservoir
-Production
-Economics
-Integration

The package will always be in permanent development and open to suggestions to enhance the program. As the code has been written so far by a code enthusiastic Petroleum Engineer I hope to learn as much as possible to get better and usefull programs.

WellTesting.jl Description

WellTesting.jl is a package that allows to carry out Pressure Test Analysis (DrawDown & BuildUp)

Example

Given some Well pressure data

Data=CSV.read("WellData.csv")
DrawDown=Data[Data.Time .<=200,:]
BuildUp=Data[Data.Time .>=200,:];

p1=plot(Data.Time,Data.Pressure, linecolor = :black, ylabel="Pressure [psi]", label="Sensor Data")
p2=plot(DrawDown.Time,DrawDown.Pressure, linecolor = :green, xlabel=" Time[hrs]", ylabel="Pressure[psi]", label="DrawDown")
p2=plot!(BuildUp.Time,BuildUp.Pressure, linecolor = :red, label="BuildUp")
plot(p1,p2,layout=(2,1))

DrawDown

You can plot cartesian, semilog and loglog scale data by calling the Recipes

Cartesian scale

You can simply call dd recipe to plot a cartesian scale data and the
pore volume calculated as well as the drainage area based on the slope of the
straight line which represent the Pseudosteady State flow.

 dd(DrawDown.Time,DrawDown.Pressure,
    PseudosteadyRange=[50,200], Q=[150,0,0],β=[1.3,0,0], μ=[1,1,1], h=20,Rs=0, ct=2e-6, rw=0.4, ϕ=0.15)

Semilog scale

ddsl(DrawDown.Time[2:end],DrawDown.Pressure[2:end],
     UnsteadyRange=[0.05,10],Q=[150,0,0],β=[1.3,0,0], μ=[1,1,1], h=20,Rs=0, ct=2e-6, rw=0.4, ϕ=0.15, pr=true)

LogLog scale

ddll(DrawDown.Time,DrawDown.Pressure,
    B=2.9, To=0.1,Q=150,β=1.2, k=730, h=20, μ=1, s=-2.19)

Subplots

drawdown(DrawDown.Time,DrawDown.Pressure, UnsteadyRange=[0.05,10],PseudosteadyRange=[50,200], Q=[150,0,0],β=[1.3,0,0],
            μ=[1,1,1], h=20,Rs=0, ct=2e-6, rw=0.4, ϕ=0.15, pr=true, B=2.8, To=0.1)

BuildUp

Horner Plot

hornerplot(BuildUp.Time,BuildUp.Pressure,
 UnsteadyRange=[10.0,2000.],Q=[150.0,0.0,0.0],β=[1.3,0,0], μ=[1.,1.,1.], h=20.0,Rs=0, ct=2e-6, rw=0.4, ϕ=0.15)

Derivative Plot

derivativeplot(BuildUp.Time,BuildUp.Pressure)

References

• Ahmed, P. P., & McKinney, P. (2011). Advanced Reservoir Engineering. Elsevier Science.
• Lee, J. (1982). Well testing.
• Chapra, S. C., & Canale, R. P. (1988). Numerical methods for engineers. McGraw-Hill
• Macualo, Freddy Humberto Escobar. Novel, Integrated and Revolutionary Well Test Interpretation and Analysis. IntechOpen, 2019.