Application:

Type

curve can be used for:

•

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.