Well testing program generally consists of several tests conducted either at the surface or directly at the sub-surface. This program is aim to develop models of the wells that can then be used to construct conceptual and numerical models of the reservoir. Well testing and evaluation is a very important activity to obtain data or information about well characteristics, production potential, and reservoir properties. Several stages of well testing and evaluation, including:
• Completion test
This measurement is aimed to determine the depth of the production and feedzones and its productivity
• Heating Up test
The heating measurements consist of temperature-pressure profiles made at expanding time intervals after stopping injection
• Production test
Production test (discharge/output test) is aimed to determine: fluid properties in reservoir, total mass flowrate and enthalpy from various wellhead pressure, and steam fraction.
• Interference test
One of pressure transient test that commonly used to determine the relationship between wells so that it can give an estimation of its permeability