Formation Integrity Test (Fit)

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Formation Integrity Test (Fit) is the formula to test drive of formation and a casing shoe by increasing lowest Hole Pressure (Bhp) to designed pressure. Fit is commonly conducted to ensure that formation below the casing show will not be broken while drilling the next section with higher lowest hole pressure. Normally, drilling engineers in town will organize how much formation integrity test pressure required and a unit of Fit is commonly in pound per gallon unit.

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How is Formation Integrity Test (Fit)

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How to intuit Pressure Required for Formation Integrity Test.

Before forming formation integrity test, you should know pressure required for Formation Integrity Test. The formula showed below demonstrates you how to intuit required Fit pressure.

Pressure required for Fit (psi) = (Required Fit in ppg - Current Mud Weight in ppg) x 0.052 x True Vertical Depth of shoe in feet

Example below demonstrates how to use the formula to intuit pressure required for the test:

Required Fit (ppg) = 14.5

Current mud weight (ppg) = 9.2

True Vertical Depth of shoe (ft) = 4000 Tvd

Pressure required for Fit = (14.5-9.2) x 0.052 x 4000 = 1102 psi

Note: The acronyms are listed below;

psi = pound per quadrilateral inch

ppg = pound per gallon

ft = feet

Formation Integrity Test (Fit) procedures are as follows;

1. Drill out new formation few feet, circulate lowest up and obtain formation samples to confirm that new formation is drilled to and then pull a drill string into the casing shoe.

2. Close annular preventer or pipe rams, line up a cement pump, and circulate straight through an opened choke line to ensure that exterior line is fully filled with drilling fluid.

3. Stop the pump and close a choke valve.

4. Gradually pump small number of drilling fluid into a well with constant pump strokes and recommended pump strokes are 5 to 10 strokes per minute. Narrative total pump strokes, drill pipe pressure and casing pressure. Pump until casing pressure reaches the pressure required for formation integrity test. Stop pumping and hold pressure for few minutes to confirm pressure stability.

5. Bleed off pressure and open up the well. Then start drilling operation.

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