curve can be used for:
projects: SAGD, CSS
stage frac unconventional plays
predicting future estimation of production.
such as skin, permeability, , fracture , porosity parameters
for buildup test design and
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:
The main procedure that used in type curve
analysis of declining rate- time data are as follows
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.
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.
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
the value of CDe2s that
best matches the field data.
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.
Calculate permeability from the
pressure match-point ratio, then calculate S skin factor and CD by the
The procedure is clearly shown by
the following graph:
(2018). Type curves -. online Available at: http://petrowiki.org/Type_curves
Accessed 25 Jan. 2018.
M. (1980). Decline Curve Analysis Using Type Curves. Journal of Petroleum
Technology, 32(06), pp.1065-1077.
D., Ayoub, J. A., & Pirard, Y. M. (1989, June 1). Use of Pressure
Derivative in Well Test Interpretation. Society of Petroleum Engineers.
(2018). online Available at:
Accessed 26 Jan. 2018.