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Unformatted text preview: aphical representation of the estimated pore pressure, mud weight, and fracture gradient, which together define the appropriate drilling margins. Drilling engineers conduct a “leak‐off” test to determine the strength or fracture pressure of the open formation. This test is usually conducted immediately after drilling past the cemented casing shoe in the well. 59 During the test, the well is shut in and fluid is pumped into the wellbore to gradually increase the pressure that the formation experiences. At a certain pressure, fluid pumped into the well will enter the formation, or leak‐off, by moving through permeable paths in the rock or by creating a space by fracturing the rock. If the pressure is increased beyond the formation fracture point, fracturing of the formation can occur. The results of the leak‐off test dictate the maximum pressure or mud weight that may be applied to the well during drilling operations before the formation can be expected to take fluid. BOEMRE regu...
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This note was uploaded on 01/18/2014 for the course BEPP 305 taught by Professor Nini during the Fall '11 term at UPenn.

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