PETE 625 Well Control

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PETE 625Well Control

• Lesson 15
• Circulation Kill Techniques - contd

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Circulation Kill Techniques

• Wait Weight Method
• Concurrent Method
• Annulus Pressure Profiles
• Kicks in Oil-Based Mud

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Assignments

• HW 9 Ch 4, Problems 11- 20
• due Wednesday, July 7
• Read All of Chapter 4 (to p. 184)

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ICP
FCP
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ICP KRCP SIDPP 980 250
1,230 psig
FCP KRCP rKILL/rOLD 980 12.4 /
12.0 1,013 psig
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Safety factor added to KWM (0.3 lb/gal)
(When Balanced, FCP 1,013 psig)
FCP KRCP rKILL/rOLD 980 12.7 /
12.0 1,037 psig
Resulting increase in BHP 0.052 0.3
12,000 187 psi
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Safety factor added to KWM (0.3 lb/gal)
Increase in BHP 187 psi
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Drill String Capacity
3,055 ft of 5-in, 25.60 lb/ft drillpipe 700
strokes 13,423 ft of 5-in 19.50 lb/ft
drillpipe 3,513 strokes 5,952 ft of 3 ½-in
15.50 lb/ft drillpipe 577 strokes 570 ft of 4
¾ 2-in drill collars 32 strokes TOTAL D.S.
Capacity 4,822 stks
327.3 bbls
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- x
- x
- x
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Directional Well
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Directional Well
?
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Concurrent Method
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Concurrent Method
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Pressure
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Fig. 4.55 BHP for the Concurrent Method
described in Example 4.15
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Annulus Pressure Profiles Annulus mud density
is constant
D
D
D
D
D
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Annulus Pressure Profiles Kill mud and
Old Mud present
D
D
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Annulus Pressure CalculationsData for Example
4.16 contd
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D
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D
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D
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Kicks in Oil-Based Mud

• Solubility of gas in oil
• reduces surface pit gain measurements
• reduces surface measurements of flow increase
• reduces SICP
• stays in solution until pressure is reduced to
  bubble point
• as compared to water based mud systems

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Free gas present at the start of circulation
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All gas in solution initially
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All gas stays in solution throughout circulation
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f0 is the muds oil volume fraction
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GOR
118.7
675
Bubblepoint Pressure, psia
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rso is the solution GOR
Bog is the FVF of oil containing gas
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