petroleum engineering 406
DESCRIPTION
Petroleum Engineering 406. Lesson 5 Well Control. Read. Well Control Manual Chapter 9 Homework 3 Due Feb. 10, 1999. Content. Casing Seat Selection Land and shallow water Conventional Based on X ppg kick Based on X ppg kick and X bbl gain. Content. Casing Seat Selection Deep Water. - PowerPoint PPT PresentationTRANSCRIPT
Petroleum Engineering 406
Lesson 5
Well Control
Read
• Well Control Manual– Chapter 9
• Homework 3– Due Feb. 10, 1999
Content
• Casing Seat Selection– Land and shallow water
• Conventional
• Based on X ppg kick
• Based on X ppg kick and X bbl gain
Content
• Casing Seat Selection– Deep Water
Content
• Casing Seat Selection– Riserless
Land and shallow water
• Plot Pore Pressure and Fracture Gradient curves– Pore pressure from Eaton– Resistivity log
• FP=OB-(OB-FPn)*(Cn/Co)^1.2
– Conductivity• FP=OB-(OB-FPn)*(Ro/Rn)^1.2
– Sonic• FP=OB-(OB-FPn)*(Tn/To)^3
Pore pressure from Eaton
– dc exponent• FP=OB-(OB-FPn)*(dc calculated/dc normal)^1.2
– FP = formation pressure,ppg– OB = overburden stress, ppg– FPn = Normal formation pressure, ppg
Pore pressure from Eaton
– Ro = Shale resistivity from the well log, ohm-meters
– Rn = Shale resistivity from normal trend– Co = Shale conductivity from the well log– Cn = Shale conductivity from the normal line To = Shale travel time from the well log Tn = Shale travel time from the normal line– dc = Corrected d exponent
Fracture Pressure from Eaton
• FG=(OB-FP)*[Poisson’s ratio/(1-Poisson’s ratio)]+FP
Casing Seat Selection - Conventional
Casing seat selection
Standard
0.5 ppg kick
0.5 ppg kick
200’ tallPore Pressure
Fracture Pressure
DataMW 17.9 ppgKick Size 0.5 ppgKick Size 200 feet in annulusSICP 555.36 psi Standard .5 ppg 200 ft
Pore Fracture Pore Fracture Wellbore Wellbore WellboreDepth pressure pressure pressure pressure Press Pressure Pressureft ppg ppg psi psi psi psi psi
0 9 11.4 0 0 0 390 555.361000 9 12.2 468 634.4 930.8 1320.8 1486.168000 9 15.9 3744 6614.4 7446.4 7836.4 8001.768600 15.6 17.6 6976.32 7870.72 8004.88 8394.88 8560.249000 16.4 17.8 7675.2 8330.4 8377.2 8767.2 8932.56
15000 17.8 18.6 13884 14508 13962 14352 14517.36
Deep Water Fracture Pressure
• Eaton’s Gulf Coast Overburden Gradient
Deep Water Fracture Pressure
Deep Water Fracture Pressure
Deep Water Fracture Pressure
OB Gradient below ML
Deep Water Fracture Pressure
Deep Water Casing Seat
Deep Water Casing Seat
Riserless Casing Seats