21.Well Control Complications - PETE 661 Drilling...

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A T M PETE 661 Drilling Engineering Lesson 21 Well Control Complications
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2 A T M Well Control Complications Volumetric Well Control Lubrication Complications During Conventional Kill Techniques to Reduce Annular Friction
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3 A T M HW #12 - due Dec 02, 2002 Review
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4 A T M Gas Kick Migration While a well is shut in the casing pressure increase by 1,040 psi in 2 hours. Mud Weight = 10 lb/gal How fast is the kick migrating?
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5 A T M Gas Kick Migration How fast is the kick migrating? X ft = ? 0.052 * 10 * X = 1,040 psi X = 2,000 ft (in 2 hrs.) Migration rate = 1,000 ft/hr p p + 1,040
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6 A T M Volumetric Well Control Non-Circulating method of well control. Allows a gas bubble to migrate to the surface while systematically allowing the bubble to expand. It also maintains the BHP at or above formation pressure Used whenever circulation cannot be used to kill the well.
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7 A T M Two situations can be present Drillpipe can be used to monitor pressure Drillpipe cannot be used
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8 A T M Drillpipe can be used When Bit is on bottom Bit is not plugged No float in drillstring
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9 A T M Drillpipe can be used Procedure Determine a safety margin for the casing pressure (usually 50 - 100 psi above initial stabilized SICP and SIDPP) Determine working margin (50 - 100 psi above safety margin) As bubble migrates, casing pressure will eventually reach the safety margin
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10 A T M Drillpipe can be used Procedure Allow the casing pressure to reach the upper limit of the working margin Very slowly bleed a small volume of mud from the annulus (approximately 1/4 bbl) into a calibrated tank. Then close the choke.
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