23. Special Well Control Applications

23. Special Well Control Applications - Lesson 23 Special...

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A T M Lesson 23 Special Well Control Applications Underbalanced Drilling (UBD)
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2 A T M Special Well Control Applications Underbalanced Drilling Well Control in Unconventional Hole Programs Casing and Cementing Operations
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3 A T M Special Well Control Applications Homework # 12 On the Web Due Dec 02, 2002
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4 A T M Underbalanced Drilling (UBD) In drilling UBD wells the ECD is intentionally kept below the formation pore pressure.
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5 A T M Reasons for UBD Minimize formation damage Faster penetration rates Longer bit life and fewer trips Eliminating one or more casing strings
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6 A T M Reasons for UBD Reduced risk of lost circulation Reduced risk of differential sticking Lower mud costs Earlier oil sales
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7 A T M Drilling Fluids used in Underbalanced Drilling Air and Natural Gas Drilling Mist and Foam Drilling Underbalanced Drilling w/Mud
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8 A T M Air and Natural Gas Drilling
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9 A T M BOP System for Air and Natural Gas Drilling
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10 A T M Rotating Head
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11 A T M Air and Natural Gas Drilling Compressor at surface Drillpipe Float Gas in drillstring All make DP gauge unreliable for BHP Casing gauge is used to predict BHP zT D cs p g e p p 3 . 53 γ = Pore Pressure Casing Head Pressure
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12 A T M Example 7.1 Excessive gas rates from a sandstone at 7,200 ft threaten a blowout on an air-drilled hole in the Arcoma Basin. The well is shut-in and, after wellbore temperatures reach equilibrium, the casing pressure gauge reads 1,250 psig. Estimate the kill-mud density requirement. What is the maximum pressure at the 1,500-ft shoe depth before and during the kill procedure? Assume the average temperature in the annulus is 160 o F and use a 0.70 specific gravity gas in the calculations (ignore the effect of the air mixed in with the hydrocarbons).
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13 A T M Example 7.1 - Solution zT D cs p g e p p 3 . 53 γ = Use Eq. 7.1 and iterate by first assuming the compressibility factor is 1.00 ( 29 ) 620 )( 1 ( 3 . 53 ) 200 , 7 )( 70 . 0 ( p e 14 250 , 1 p + = Pore pressure, p p = 1,472 psia
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14 A T M Take the pseudoreduced properties on wellbore
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This note was uploaded on 10/30/2011 for the course PETROLEUM 661 taught by Professor Dr.jeromej.schubert during the Fall '11 term at Texas A&M University-Galveston.

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23. Special Well Control Applications - Lesson 23 Special...

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