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WELLBORE STABILITY ,[object Object]
TRADITIONAL WELL DESIGN ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Case Study, Niger Delta, Nigeria Comparison Between Traditional & Geo-mechanics method of Well Planning  ,[object Object],[object Object]
TABLE 1 Fracture Gradient (psi/ft) Mud Weight (psi/ft) Mud Overbalance (psi/ft) 0.603133333333333 0.526666666666667 0.0764666666666666 0.6048 0.536956307031351 0.0867563070313506 0.6068 0.5285 0.0783 0.608133333333333 0.529166666666667 0.0789666666666667 0.609133333333333 0.529666666666667 0.0794666666666666 0.610133333333333 0.530166666666667 0.0799666666666667 0.6118 0.531 0.0808 0.642906666666667 0.566633333333333 0.0762733333333333 0.64424 0.5673 0.0769399999999999 0.644906666666667 0.567633333333333 0.0772733333333333 0.646906666666667 0.568633333333333 0.0782733333333333 0.64724 0.5688 0.07844
HOW CAN WELLBORE STABILITY ADD VALUE TO THE INDUSTRY? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
THE GEOMECHANICAL MODEL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
BUILDING A GEOMECHANICAL MODEL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
PORE PRESSURE, FRACTURE, PRESSURE, AND WELL BORE STABILITY  THE COMPLETE PICTURE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
WELL BORE STABILITY ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Case Study, Niger Delta, Nigeria. ,[object Object]
 
 
 
 
 
 
 
 
 
TABLE 2 Depth (ft) Overburden Stress (psi/ft) Pore Pressure (psi/ft) 8240 0.909 0.45 8710 0.914 0.45 9283 0.92 0.45 9753 0.924 0.45 10043 0.927 0.45 10347 0.93 0.45 10917 0.935 0.45 12584 0.948 0.45 13204 0.952 0.45 13614 0.954 0.45 14368 0.96 0.45 14498 0.961 0.45
TABLE 3 Minimum Horizontal Stress (psi/ft) Well Inclination(deg) Well azimuth(deg) 0.469666667 0 0 0.471333333 5 5 0.473333333 10 10 0.474666667 15 15 0.475666667 20 20 0.476666667 25 25 0.478333333 30 30 0.482666667 35 35 0.484 40 40 0.484666667 45 45 0.486666667 50 50 0.487 55 55
TABLE 4 Poisson's Ratio Friction angle(deg) UCS (psi/ft) 0.25 25.4 0.289 0.25 26.7 0.3596 0.25 24.9 0.2243 0.25 25.4 0.2393 0.25 25.4 0.2324 0.25 25.4 0.233 0.25 26.2 0.2633 0.25 26.7 0.2487 0.25 28 0.294 0.25 27.2 0.2518 0.25 29.7 0.3291 0.25 29.7 0.3261
TABLE 5 Compressional Velocity Shear Velocity Maximum Horizontal Stress (psi/ft) 45 5 0.667366666666667 56 10 0.670533333333333 67 15 0.674333333333333 78 20 0.676866666666667 89 25 0.678766666666667 100 30 0.680666666666667 111 35 0.683833333333333 122 40 0.692066666666667 133 45 0.6946 144 50 0.695866666666667 155 55 0.699666666666667 166 60 0.7003
TABLE 6 Collapse Pressure (psi/ft) Fracture Gradient (psi/ft) Mud Weight (psi/ft) 0.479896447759961 0.469666666666667 0.474781557213314 0.56093485246493 0.471333333333333 0.516134092899132 0.417355126422702 0.473333333333333 0.445344229878018 0.440704205542267 0.474666666666667 0.457685436104467 0.439936355143774 0.475666666666667 0.45780151090522 0.447046417631349 0.476666666666667 0.461856542149008 0.489090182237921 0.478333333333333 0.483711757785627 0.483988464233271 0.482666666666667 0.483327565449969 0.53901938462006 0.484 0.51150969231003 0.487310584993971 0.484666666666667 0.485988625830319 0.575089388054011 0.486666666666667 0.530878027360339 0.560433280276301 0.487 0.523716640138151
TABLE 7 Mud Overbalance (psi/ft) Distance from Fault (ft) Open Hole Time (Second(s)) Deplected Pore Pressure 0.224781557213314 10000 0.234989743562158 0.25 0.266134092899132 10000 0.292395542508484 0.25 0.195344229878018 10000 0.182381313083017 0.25 0.207685436104467 10000 0.194578012575863 0.25 0.20780151090522 10000 0.188967530809154 0.25 0.211856542149008 10000 0.189455398788868 0.25 0.233711757785627 10000 0.214092731764416 0.25 0.233327565449969 10000 0.20222127759138 0.25 0.26150969231003 10000 0.239055310059773 0.25 0.235988625830319 10000 0.204741928819901 0.25 0.280878027360339 10000 0.267595586873032 0.25 0.273716640138151 10000 0.265156246974463 0.25

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Divine Somiari,S Well Bore Stability Presentation

  • 1.
  • 2.
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  • 4. TABLE 1 Fracture Gradient (psi/ft) Mud Weight (psi/ft) Mud Overbalance (psi/ft) 0.603133333333333 0.526666666666667 0.0764666666666666 0.6048 0.536956307031351 0.0867563070313506 0.6068 0.5285 0.0783 0.608133333333333 0.529166666666667 0.0789666666666667 0.609133333333333 0.529666666666667 0.0794666666666666 0.610133333333333 0.530166666666667 0.0799666666666667 0.6118 0.531 0.0808 0.642906666666667 0.566633333333333 0.0762733333333333 0.64424 0.5673 0.0769399999999999 0.644906666666667 0.567633333333333 0.0772733333333333 0.646906666666667 0.568633333333333 0.0782733333333333 0.64724 0.5688 0.07844
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  • 12.  
  • 13.  
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  • 20. TABLE 2 Depth (ft) Overburden Stress (psi/ft) Pore Pressure (psi/ft) 8240 0.909 0.45 8710 0.914 0.45 9283 0.92 0.45 9753 0.924 0.45 10043 0.927 0.45 10347 0.93 0.45 10917 0.935 0.45 12584 0.948 0.45 13204 0.952 0.45 13614 0.954 0.45 14368 0.96 0.45 14498 0.961 0.45
  • 21. TABLE 3 Minimum Horizontal Stress (psi/ft) Well Inclination(deg) Well azimuth(deg) 0.469666667 0 0 0.471333333 5 5 0.473333333 10 10 0.474666667 15 15 0.475666667 20 20 0.476666667 25 25 0.478333333 30 30 0.482666667 35 35 0.484 40 40 0.484666667 45 45 0.486666667 50 50 0.487 55 55
  • 22. TABLE 4 Poisson's Ratio Friction angle(deg) UCS (psi/ft) 0.25 25.4 0.289 0.25 26.7 0.3596 0.25 24.9 0.2243 0.25 25.4 0.2393 0.25 25.4 0.2324 0.25 25.4 0.233 0.25 26.2 0.2633 0.25 26.7 0.2487 0.25 28 0.294 0.25 27.2 0.2518 0.25 29.7 0.3291 0.25 29.7 0.3261
  • 23. TABLE 5 Compressional Velocity Shear Velocity Maximum Horizontal Stress (psi/ft) 45 5 0.667366666666667 56 10 0.670533333333333 67 15 0.674333333333333 78 20 0.676866666666667 89 25 0.678766666666667 100 30 0.680666666666667 111 35 0.683833333333333 122 40 0.692066666666667 133 45 0.6946 144 50 0.695866666666667 155 55 0.699666666666667 166 60 0.7003
  • 24. TABLE 6 Collapse Pressure (psi/ft) Fracture Gradient (psi/ft) Mud Weight (psi/ft) 0.479896447759961 0.469666666666667 0.474781557213314 0.56093485246493 0.471333333333333 0.516134092899132 0.417355126422702 0.473333333333333 0.445344229878018 0.440704205542267 0.474666666666667 0.457685436104467 0.439936355143774 0.475666666666667 0.45780151090522 0.447046417631349 0.476666666666667 0.461856542149008 0.489090182237921 0.478333333333333 0.483711757785627 0.483988464233271 0.482666666666667 0.483327565449969 0.53901938462006 0.484 0.51150969231003 0.487310584993971 0.484666666666667 0.485988625830319 0.575089388054011 0.486666666666667 0.530878027360339 0.560433280276301 0.487 0.523716640138151
  • 25. TABLE 7 Mud Overbalance (psi/ft) Distance from Fault (ft) Open Hole Time (Second(s)) Deplected Pore Pressure 0.224781557213314 10000 0.234989743562158 0.25 0.266134092899132 10000 0.292395542508484 0.25 0.195344229878018 10000 0.182381313083017 0.25 0.207685436104467 10000 0.194578012575863 0.25 0.20780151090522 10000 0.188967530809154 0.25 0.211856542149008 10000 0.189455398788868 0.25 0.233711757785627 10000 0.214092731764416 0.25 0.233327565449969 10000 0.20222127759138 0.25 0.26150969231003 10000 0.239055310059773 0.25 0.235988625830319 10000 0.204741928819901 0.25 0.280878027360339 10000 0.267595586873032 0.25 0.273716640138151 10000 0.265156246974463 0.25