13. Off Bottom Kicks - PETE 625 Well Control Lesson 13 Off...

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PETE 625 Well Control Lesson 13 Off Bottom Kicks
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2 Off Bottom Kicks Slugging of drillpipe Hole fill-up during trips Surge and Swab pressures Kick detection during trips Shut-In Procedures Blowout Case History
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Assignments HW # 8: Ch 4, Problems 1- 10 due Friday, July 2 Read: Ch. 4 to p.155 and Appendices A and B
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4 Slugging of Drillpipe p bh = g 1 h 1 + g 2 h 2 = g 2 h 3 Hydrostatic Balance When stopping circulation, ECD is lost. Always check for flow. “Slugging” of Drillpipe to prevent “Wet Trip” h 1 h 2 h 3
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5 Failure to keep the hole full When pipe if removed from the wellbore the fluid level drops resulting in loss of HSP. To prevent kicks the hole must be re-filled with mud.
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6 W = ρ V
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7
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8 More Displacement factors
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9 Solution
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10 Example 4.2 – cont’d
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11 Example 4.2 – cont’d
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12 Example 4.2 – cont’d
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13 The actual mechanics are complicated, but can be sufficiently described by: Pressure to initiate movement in a thixotropic mud Steady-flow viscous drag between moving pipe and a static borehole, Dynamic pressures resulting from mud acceleration or deceleration
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14 Annulus Mud Velocity Profile during downward movement of
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13. Off Bottom Kicks - PETE 625 Well Control Lesson 13 Off...

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