Application: Type curve can be used for: • Thermal

Application:

Type
curve can be used for:

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•        
Thermal
projects: SAGD, CSS

•        
Water
floods

•        
Multi
stage frac unconventional plays

•        
 Individual Wells

•        
For
predicting future estimation of production.

•        
Estimating
the recovery.  

•        
Finding
reservoir parameters
such as skin, permeability, , fracture , porosity parameters

•        
for buildup test design and
interpretation

 

Figure 1

 

A
Gringarten type curve is the most practically usable type curve in oil
industry. In Gringarten type
curve, pD is plotted vs. the time function tD/CD,
with a parameter CDe2s as shown
in below figure:

 

Figure 2

Procedure:

 The main procedure that used in type curve
analysis of declining rate- time data are as follows

1-     
Plot
measured pressure drop ?p versus ?t data in any convenient units on log-log
tracing paper of the same cycle size as the type curve to be used.

2-     
Put
the tracing paper data curve over the type curve that has been plotted. The
paper has to be kept parallel and shifting in a position to make the best fit
of the data of type curve and till the match point will be achieved.

3-     
To
gain the reservoir variable a match point selected anywhere on the overlapping
portion of the curve where the measured points match; they correspond to value
of CDe2s 

4-     
Select
the value of CDe2s that
best matches the field data.

5-     
Pick
a match point, M, whose coordinates can be read in both the type curve system
of axes (p D, t D/C D) as well as in the field data system (?p, ?t), The point
M can be chosen anywhere on the plot, not necessarily on the curve.

6-     
Calculate permeability from the
pressure match-point ratio, then calculate S skin factor and CD by the
following Equation:

 

          

 

 

 

 

 

 

 

 

 

 

 

 

The procedure is clearly shown by
the following graph:

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

 

References:

Petrowiki.org.
(2018). Type curves -. online Available at: http://petrowiki.org/Type_curves
Accessed 25 Jan. 2018.

Fetkovich,
M. (1980). Decline Curve Analysis Using Type Curves. Journal of Petroleum
Technology, 32(06), pp.1065-1077.

Bourdet,
D., Ayoub, J. A., & Pirard, Y. M. (1989, June 1). Use of Pressure
Derivative in Well Test Interpretation. Society of Petroleum Engineers.
doi:10.2118/12777-PA

Landman.ca.
(2018). online Available at:
http://landman.ca/wp/wp-content/uploads/2014/07/Sept-18-2015-Sproule.pdf
Accessed 26 Jan. 2018.