After the cement has hardened it must be pressure tested. The tests should include both positive and negative differential pressure. The following should be considered when making a test:
• A positive pressure test can be performed by closing the BOPs and pressuring up on the casing. (Do not exceed formation fracture gradient.)
• A negative pressure test (or inflow test) can be performed by reducing the hydrostatic pressure inside the casing. This can be done using a DST tool or displacing with the well to diesel. This test is more meaningful since mud filled perforations may hold pressure from the casing, but may become unblocked when pressure from the formation is applied.

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