Case Study 2: Negative Skin in Low-Perm Formations
You have probably come across well test interpretations that show a negative skin of -5 to -3 together with low permeability formation (for example, 4 md). What is the reason for this? – Vertical oil well– Not hydralically fractured well– Carbonate res. I have two interpretations, and I would like you to share yours as […]
Saphir (PTA) Tutorial; A Document Prepared by KAPPA
Going through this tutorial provided by KAPPA, you will be guided step by step to learn how to use the main features of Saphir v.5.60 to perform a Pressure Transient Analysis (PTA): creating a new document, loading the data, extracting the data interval and generating the necessary plots, the use of the document tabs, tool […]
Case Study 1: The Effect of Nearby Wells on Well Test Results (A Horizontal Oil Well)
Inter-Well Communication in a Real Field Experience: As shown in the following plot, the bottomhole pressure data from a ~10-day buildup test in one of the horizontal oil wells in the Middle East does not exhibit a normal trend. Further investigations revealed that the pressure behavior was influenced by nearby producing wells. About three hours […]
Cyclic Production (Causes and Solutions)
Some wells in the Middle East have “Cyclic Production” behavior. For example, they produce for 10 days and then need to be shut in for 7 days so the reservoir can recharge, after which the well can be opened again. What causes this behavior? And what are the solutions for maintaining production from such wells? […]