Petroleum Engineering 406

1. Petroleum Engineering 406 Lesson 2 Well Control

2. Read • Well Control Manual • Chapter 4-6 • Homework 1 Due Jan. 1/28/04

3. Causes of Kicks - Tripping • Failure to keep the hole full

4. Causes of Kicks - Tripping • Swabbing

5. Causes of Kicks • Lost circulation

6. Causes of Kicks - Drilling • Insufficient density of drilling fluid • Drilling into Abnormal pressure

7. Causes of Kicks - Other • Annular flow after cement job • Lost control during DST • Drilling into adjacent wells • Drilling through (shallow) gas zones at excessive rates

8. Kick Warnings - Drilling • Drilling break • Increase in flow rate

9. Kick Warnings - Drilling • Pit gain

10. Kick Warnings - Drilling • Decrease in circulating pressure • Increase in pump rate • Well flows with pumps off

13. Kick Warnings - Tripping • Improper hole fill • DO NOT WAIT FOR PIT GAIN OR FOR THE WELL TO FLOW • What should you do if the well is not taking the proper fill on a trip?

14. Soft Shut In Pick up the kelly until the tool joint clears the floor. Shut down the pumps. Check for flow. If flowing, open the HCR valve. Close BOP. Close choke. Hard Shut In Pick up the kelly until the tool joint clears the floor. Shut down the pumps. Check for flow. If flowing, Close BOP. Open HCR valve. Close choke. Shut In Procedures - Drilling

15. Soft Shut In Notify supervisors Read & record SIDPP, SICP, Pit Gain, Time, Date Prepare to implement kill. Hard Shut In Notify supervisors Read & record SIDPP, SICP, Pit Gain, Time, Date Prepare to implement kill. Shut In Procedures - Drilling

16. Shut In Procedures - Tripping 1. Set slips below top tool joint 2. Stab a full opening safety valve and close it. 3. Open the HCR and close the BOP, and choke 4. Pick up and stab the kelly or a pump-in line

17. Shut In Procedures - Tripping 5. Open the safety valve. 6. Notify the supervisors. 7. Read and record SIDPP, SICP, Pit gain, TVD of Well, TVD of bit, time, and date. 8. Prepare to implement kill.

18. Shut In Procedures - Diverters • With diverters in use (prior to setting surface casing) • DO NOT SHUT IN WELL - DIVERT.

19. Shut In Procedures - Casing 1. Lower casing until a swage and valve can be stabbed. 2. Close the casing rams or annular preventer. 3. Stab the swage and valve. 4. Notify supervisor 5. Read and record pressures 6. Prepare to kill well

20. Well Kill Methods • Wait & Weight method • Driller’s method • Circulate & weight • Concurrent method

21. Well Kill Methods • Reverse circulation • Dynamic kill • Bullheading • Lubricate and bleed • Volumetric

22. Constant BHP Well Control

23. Wait & Weight Method • Weight up mud to KWM and complete kill sheet • Circulate KWM to bit following decline schedule • Circulate KWM back to surface maintaining FCP on drillpipe pressure

24. Wait & Weight Method 7000

25. Wait & Weight Method • When well is full of KWM, Shut in well • Check for remaining pressures • If surface pressures are zero, check for flow by cracking choke • If no flow, carefully open BOP’s • Circulate around again

26. Wait & Weight - Advantages • Kill well in one circulation • Least amount of maximum casing pressures

27. Driller’s Method • Shut in well long enough to measured stabilized SI pressures • Circulate kick fluids from wellbore with original weight mud maintaining ICP on drillpipe • When kick fluids are circulated out, shut in well

28. Driller’s Method • Weight up mud to KWM • Circulate KWM to bit following pressure decline schedule • Continue circulating KWM around maintaining FCP until KWM reaches surface • Shut well in, check for pressures, flow etc.

29. Driller’s Method

30. Driller’s Method - Advantages • Short shut in times • Easy

31. Circulate & Weight • Shut in long enough to measure stabilized SI pressures • Begin circulating kick from wellbore with OWM at ICP • While circulating, isolate one pit and begin to weight up to KWM • When mud is weighted up, switch pump suction to weighted pit, and follow W&W

32. Circulate & Weight - Advantages • Best of W&W and Driller’s

33. Concurrent method • Weight up and circulate in increments • Takes one complete circulation for each increment

34. Reverse Circulation • Circulate down annulus and up the drillpipe or tubing. • Used extensively in workovers and completions

35. Dynamic Kill • For blowout control • Use high pump speeds and viscosities to generate high annular friction pressures • Annular friction used instead of surface choke • For shallow gas • Circulate as fast as rig pumps will allow through diverters • DO NOT HOLD ANY BACK PRESSURE

36. Bullheading • Pump kill fluid down wellbore, usually at relatively high speeds to force formation fluids back into formation • Used predominantly in: • Workover and completion operations • Austin Chalk flow drilling • When danger of H2S

37. Lubricate & Bleed • Only applicable with gas at the surface • Pump in KWM into wellbore • Let KWM fall for some time • Bleed off gas • Repeat

38. Volumetric Method • Used when circulation is not possible or when gas is migrating in closed in well • As surface pressures increase due to gas migration, bleed off excessive pressure and allow bubble to expand. • Continue until circulation can be resumed or until gas reaches surface

39. Use of Kill Sheet • Pre-recorded information • SPP • Pump output • Drillstring capacity • Annular capacity • Pressure limitations • Circulation times • Number of strokes

40. Use of Kill Sheet • Post kick information • SIDPP • SICP • Pit gain • Time • Date

41. Use of Kill Sheet • Calculate: • KWM = SIDPP/0.052/TVD + OWM • ICP = SPP + SIDPP • FCP = SPP*KWM/OWM • Plot Pressure Decline Schedule

42. Kill Sheet

43. Kill Sheet Plot ICP Plot FCP