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PETE 625 Well Control

2. Circulation Kill Techniques. Shut-In Pressures Weighting Up the Mud Driller's Method Wait

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PETE 625 Well Control

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    1. PETE 625 Well Control Lesson 14 Circulation Kill Techniques

    2. 2 Circulation Kill Techniques Shut-In Pressures Weighting Up the Mud Driller’s Method Wait & Weight Method

    3. Assignments HW # 8: Ch 4, Problems 1- 10 due Friday, July 2 HW # 9: Ch 4, Problems 11- 20 due Wednesday, July 7 Read: Ch. 4 to p.171 and Appendices A and B

    4. 4 Shut-In Pressures Once a kick is detected, and proper shut-in procedures are followed, the influx will stop when the wellbore pressure, at the depth of the kicking formation, is equal to the pressure in that formation. At this point the fluids are compressed in the wellbore so that the Shut-In Surface Pressures + the HSP = Formation Pressure

    5. 5 Shut-In Pressures Once the influx is stopped: The kick fluids must be removed from the wellbore, and The low density drilling fluid in use when the kick occurred must be replaced with KWM

    6. 6

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    9. 9 Weighting Up the Mud Example 4.6 OWM = 13.2 ppg MD = 10,350’ TVD = 10,075’ SIDPP = 400 psig Estimate the mud weight required to kill the well

    10. 10 Example 4.6 KWM = OWM + SIDPP/(0.052 * TVD) KWM = 13.2 + 400/(0.052 * 10,075) KWM = 13.2 + .76 = 13.96 ~ 14.0 ppg This would be considered a “0.8” ppg kick “Kick Intensity” = 0.8 lb/gal

    11. 11 Example 4.7

    12. 12 Example 4.7 - Solution

    13. 13 Example 4.7 – Solution – cont’d

    14. 14 Example 4.10

    15. 15

    16. 16 Example 4.10 - Solution - cont’d

    17. 17 Kill Procedures

    18. 18 KRCP - Kill Rate Circ. Pressure (lower rate! WHY?) Lower annulus friction pressure Less pressure fluctuation in response to a change in choke setting Reduced risk of pump breakdown or other mechanical problems Circulating with larger underbalance pressures for the pump liner rating

    19. 19 KRCP = SPP = KRP Reduced instantaneous gas rates through the choke manifold and mud-gas separator Minimum cuttings throughput at the choke Keeping within the capabilities of the mud-mixing system Normally 1/3 to 1/2 of normal drilling rate

    20. 20 KRP taken: Every tour by each driller When the pumps are repaired or liners changed If mud properties are changed Every 500 feet of hole drilled When the BHA changed When bit nozzles are changed

    21. 21 Well Data

    22. 22 Well Data - cont’d

    23. 23 Well Data - cont’d

    24. 24

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    26. 26 Driller’s Method

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    28. 28 Driller’ Method

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    45. 45 Wait & Weight Method

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