PENGUJIAN DRAWDOWN

A pressure drawdown test is simply a series of bottom-hole pressure

measurements made during a period of flow at constant production rate.

Usually the well is closed prior to the flow test for a period of time sufficient to allow

the pressure to stabilize throughout the formation, i.e., to reach static pressure.

1. PRESSURE DRAWDOWN TEST

As discussed by Odeh and Nabor,1 transient flow condition prevails to a

value of real time approximately equal to

Semi-steady-state conditions are established at a time value of

Idealized rate schedule and pressure response for drawdown

testing

Idealized rate schedule and pressure response for drawdown

testing

Three periods for

analysis:

• Transient or early flow

period is usually used to

analyze flow

characteristics;

• Late transient period is

more completed; and

• Semi-steady-state flow

period is used in

reservoir limit tests.

FLOW HISTORY CLASSIFICATIONS

PR :

Hitung Permeabilitas efektif

dan skin-nya