Well Testing
Well testing is the process of acquiring reservoir data and formation fluid properties after drilling the well to the planned target reservoir. The acquisition of data helps in analyzing reservoir characteristics and skin damage during drilling or other operations carried out in the well. The reservoir modelling carried out based on collected data is used for devising completion, stimulation and field development strategies to optimize reservoir production. It also helps in determining production potential of the well for investment decisions.
There are several ways to test a well. A wireline formation tester can be run in the well for capturing samples and measuring properties downhole. A Drill Stem Test (DST) can be carried out in cased hole or open hole for collecting samples and acquiring data by flowing the well to surface. A set of tools are used in downhole test string and equipment are rigged up on surface to safely flow and flare on surface.
After the initial flow for well cleanup, the flow is redirected to a test separator where formation fluids are separated into oil, gas and water phases. Any debris, sand or other material are removed for measurements and collection of samples after stabilized flow is achieved.