As per **Decline Curve Analysis Using Type Curves** by M.F. Fetkovich in
**SPE 4629**.

Click here for a sheet of Log-log 5x4 paper for the anaylsis.

Click here for link to**
Arp Type Curves_PDF_-_Created by web program.**

Click here for link to web program
to create** Arp Type Curves. **

Click here for copy of web program. PDF

Click here for link to**
Type curve match of Arp's hyperbolic decline (example)._PDF**

In reservoir evaluation we can use type curve analysis to predict the future
oil production of an oil well. Simply speaking we plot the rate vs time on a
piece of tracing paper and overlay it on known curves on another sheet of paper.
We can use the known curve to predict the amount of oil a well will produce.
The basic steps used in type curve matching of declining rate-time data are
as follows.

1. Plot the actual rate vs.time data in any convenient units on log-log tracing
paper of the same size cycle as the type curve to be used. (For convenience
all type curves should be plotted on the same log-log scale so that various
solutions can be tried.)

2. The tracing paper data curve is placed over a type curve, the coordinate
axes of the two curves being kept parallel and shifted to a position that represents
the best fit of the data to a type curve.

3. Draw a line on the tracing paper through and extending beyond the rate-time
data overlain along the uniquely matched type curves. Future rates then simply
are read from the time scale on the tracing paper.

Use the following method if you wish to determine **qi** and **Di** for
the decline curve equation: **q(t)/qi = 1 / [1 + b*Di*t]exp1/b
Click here for link to Type curve
match of Arp's hyperbolic decline (example)._PDF**

1. First we select a match point ** 100 months, 1000 BOPM which corresponds
to 12, .033**

2. Then we calculate **qi** as follows:

qDd= 0.033 = q(t)/qi = 1,000 BOPM/qi

qi = 1,000 BOPM/0.033 = 30,303 BOPM

3. Then we calculate Di as follows:

tDd = 12.0 = Di*t = Di*100 months

Di = 12.0/100 months = 0.12 months -1

Once you have defined the hyperbolic decline curve you can use it in more advanced
analysis as per **Predicting production performance using a simplified model
**by Khaled Abdel Fattah in **World Oil**.

Link here to a complete PDF sample project.

Link here to sample Excel spreadsheet for the project..

Link here to sample Excel spreadsheet for Type Curves for Gas Well.

Link here to sample PDF document for Type Curves for Gas Well