1 / 21

Understanding Casing Seat Selection in Petroleum Engineering for Well Control

This lesson focuses on casing seat selection for well control in petroleum engineering. It covers essential concepts such as conventional casing seat selection in land and shallow water contexts, considering various kicks and gain scenarios. Detailed methodologies for plotting pore pressure and fracture gradient curves are explored, using Eaton's methods for evaluating formation pressure. Key mathematical relationships are established to understand overburden, normal formation pressures, and their implications on casing seat strategies. This knowledge is crucial for optimizing well safety and integrity.

valterra-watson
Télécharger la présentation

Understanding Casing Seat Selection in Petroleum Engineering for Well Control

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Petroleum Engineering 406 Lesson 5 Well Control

  2. Read • Well Control Manual • Chapter 9 • Homework 3 • Due Feb. 10, 1999

  3. Content • Casing Seat Selection • Land and shallow water • Conventional • Based on X ppg kick • Based on X ppg kick and X bbl gain

  4. Content • Casing Seat Selection • Deep Water

  5. Content • Casing Seat Selection • Riserless

  6. 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

  7. 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

  8. 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

  9. Fracture Pressure from Eaton • FG=(OB-FP)*[Poisson’s ratio/(1-Poisson’s ratio)]+FP

  10. Casing Seat Selection - Conventional

  11. Casing seat selection Standard 0.5 ppg kick 0.5 ppg kick 200’ tall Pore Pressure Fracture Pressure

  12. Data

  13. Deep Water Fracture Pressure • Eaton’s Gulf Coast Overburden Gradient

  14. Deep Water Fracture Pressure

  15. Deep Water Fracture Pressure

  16. Deep Water Fracture Pressure

  17. OB Gradient below ML

  18. Deep Water Fracture Pressure

  19. Deep Water Casing Seat

  20. Deep Water Casing Seat

  21. Riserless Casing Seats

More Related