Formation Integrity Test is the method to test strength of formation and shoe by increasing Bottom Hole Pressure (BHP) to designs pressure. FIT is normally conducted to ensure that formation below show will not be broken while drilling the next section with higher BHP. Normally, engineers in town will design how much formation integrity test pressure required mostly in ppg.
Annular Velocity (AV) is how fast of fluid in annulus is travelling. Three main factors affecting annular velocity are size of hole (bigger ID), size of drill pipe (smaller OD) and pump rate. Read this article to understand how to calculate annular velocity.
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Equivalent Circulating Density (ECD) is the effective density that combines current mud density and annular pressure drop. ECD is critical for drilling operations because it can caused losses due to high pressure loss in annulus.
Annular capacity is one of basic values that you really need to understand. This post demonstrates you how to calculate annular capacity between casing or hole and drill pipe, tubing, or casing. There are several formulas as shown below to calculate annular capacity depending on unit of annular capacity required.
