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)*(DTn/DTo)^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 DTo = Shale travel time from the well log DTn = 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 200’ tall Pore Pressure Fracture Pressure

Data

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