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PETE 411 Well Drilling

PETE 411 Well Drilling. Lesson 26 * Well Control * * Variable Geometry *. Well Control-Variable Geometry. Initial Shut-In Conditions Driller’s Method Kick at Casing Seat Kick at Surface Wait and Weight Method Kick at Casing Seat Kick at Surface.

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PETE 411 Well Drilling

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  1. PETE 411Well Drilling Lesson 26* Well Control ** Variable Geometry *

  2. Well Control-Variable Geometry Initial Shut-In Conditions Driller’s Method Kick at Casing Seat Kick at Surface Wait and Weight Method Kick at Casing Seat Kick at Surface

  3. Read:Applied Drilling Engineering, Ch. 4 HW #14:Driller’s Method - due 11-11-02 HW #15:W&W Method - due 11-15-02 Quiz BThursday, Nov. 14, 7 - 9 p.m. Rm. 101Closed Book1 Equation sheet allowed, 8 1/2”x 11” (both sides)

  4. Example Problem 1. Determine the pressure at the casing seatat 4,000’ when using the old mud (Driller’s) versus using the kill mud(Wait and Weight) to circulate a gas kick out of the hole. 2. Determine the casing pressure at the surface when the top of the gas bubble has just reached the surface, for the same two mud weights used above.

  5. Example Problem Well depth = 10,000’ Hole size = 10.5” Drill pipe = 4.5”, 16.60 #/ft Drill Collars = 8” * 3.5” * 500 ft Surface casing = 4,000’, 13-3/8”, 68 #/ft Mud Weight = 10 ppg Fracture gradient @ 4,000’ = 0.7 psi/ft

  6. Example Problem Shut in Annulus Pressure, SICP = 400 psi Shut in Drillpipe Pressure, SIDPP = 200 psi Pit level increase = 20 barrels (kick size) Drop the Z terms but consider Temperature T at surface = 70 deg. F Temperature gradient = 1.2 deg.F/100 ft

  7. Initial (Closed-In) Conditions: Initial mud gradient = 0.520 psi/ft (0.052 * 10 = 0.520)

  8. Initial (Closed-In) Conditions: ( 20.28 ft/bbl )

  9. vdp.csg = 0.13006 bbl/ft 4,000’ 9,500’ 10,000’ vdp,hole = 0.08743 bbl/ft vdc,hole = 0.04493 bbl/ft

  10. Driller’s Method - kick at bottom F = DP * A = W

  11. Driller’s Method - kick atcsg. seat What is the pressure at 4,000 ft when the top of the kick fluid first reaches that point?

  12. Driller’s Method Top of Kick at Casing Seat 4,000’ 9,500’ 10,000’ P = 5,400 psi

  13. Driller’s Method - kick at csg. seat Again, DP K_4,000 = 16.1 psi

  14. Driller’s Method - kick at csg. seat

  15. Driller’s Method - kick at csg. seat This results in the quadratic Eqn: With the solutions:

  16. Driller’s Method - Top of Kick at Casing Seat P0,ann = ? P4,000 = 2,493 psi h4,000 = 441 ft DP = 16 psi BHP = 5,400 psi

  17. P0 = ? Driller’s Method Top of Kick at Surface 4,000’ 9,500’ 10,000’ We need two equations… BHP = 5,400 psi

  18. Driller’s Method - kick at surface (Z = const.) When the bubble rises, it expands. The volume of the bubble at the surface is given by:

  19. Driller’s Method - kick at surface

  20. Driller’s Method - kick at surface From Eq. (2), But, from Eq. (1),

  21. Driller’s Method - kick at surface So, Quadratic equation . . .

  22. Driller’s Method - kick at surface

  23. Driller’s Method - kick at surface ( = 0.57 psi/ft )

  24. Driller’s Method. Top of Kick at Surface P0,ann = 695 psi h0 = 974 ft DPK,0 = 11 psi P 4,000 = 2,280 psi P10,000 = ?

  25. Wait and Weight Method - kick at casing seat Calculate the pressure at 4,000 ft when the top of the bubble reaches this point. Volume of bubble at 4,000 ft

  26. Wait and Weight Method Top of Kick at Casing Seat Old Mud Kill Mud

  27. W&W - Pressure at top of kick at 4,000 ft Also,

  28. Wait and Weight Method - kick at surface Capacity inside drill string = DP_cap. + DC_cap.

  29. W&W - Pressure at top of kick - kick at 4,000 ft

  30. W&W - Pressure at top of kick - kick at 4,000 ft

  31. W&W - Pressure at top of kick - kick at 4,000 ft

  32. Wait and Weight Method Top of Kick at Surface 4,000’ 9,500’ 10,000’ Old Mud Kill Mud

  33. Wait and Weight Method - kick at surface Volume of gas bubble at surface:

  34. Wait and Weight Method (Engineer’s Method) - kick at surface As before, Assume all 10 lb/gal mud is inside the 13 3/8” csg. Then the height of 10 lb mud:

  35. Wait and Weight Method (Engineer’s Method) - kick at surface Hydrostatic head across the mud columns: Old Mud: Kill Mud:

  36. Hydrostatics in Annulus W&W Method - kick at surface

  37. Wait and Weight Method kick at surface From Eq. 4, substituting for h0

  38. Wait and Weight Method- kick at surface Height of Bubble at Surface

  39. Check Pressure at 4,000 ft- kick at surface Looks OK

  40. Wait and Weight Method Top of Kick at Surface Old Mud P0,ann = 611 psi Kill Mud h0 = 1,109 ft DPK,0 = 11 psi DPOld Mud = 569 psi P 4,000 = 2,161 psi P10,000 = ?

  41. Bubble at 10,000 ft Summary Driller’s Engineer’s MethodMethod

  42. Top of Bubble at 4,000 ft Summary Driller’s Engineer’s MethodMethod

  43. Top of Bubble at surface Summary Driller’s Engineer’s MethodMethod

  44. Why the difference?

  45. Maximum Casing Pressure, psi Wait and Weight Method Kick Intensity, ppg

  46. Kick Intensity, ppg Casing Pressure, psi Pump Strokes

  47. Casing Pressure, psi Volume of Mud Pumped, bbl

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