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MPD. Managed Pressure Drilling GF Landsbyen 2007. Outline. What is MPD Why MPD Conventional drilling vs MPD. Fracture Pressure. Pore Pressure. Time. Large Drilling Window Conventional Drilling. Bottom Hole Circulating Pressure. Small Drilling Window (Losses) Conventional Drilling.

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MPD

Managed Pressure Drilling

GF Landsbyen 2007


Outline
Outline

  • What is MPD

  • Why MPD

  • Conventional drilling vs MPD


Large drilling window conventional drilling

Fracture Pressure

Pore Pressure

Time

Large Drilling WindowConventional Drilling

Bottom Hole Circulating Pressure


Small drilling window losses conventional drilling
Small Drilling Window (Losses)Conventional Drilling

Fracture Pressure

Fracture Pressure

BottomHole Circulating Pressure

Pore Pressure

Time


Small drilling window kick conventional drilling
Small Drilling Window (Kick)Conventional Drilling

Fracture Pressure

Bottom Hole Circulating Pressure

Pore Pressure

Time


Why not conventional drilling

Max pore pressure gradient

Min frac pressure gradient

Why not conventional drilling?

  • Small drilling window

  • Conventional drilling is not possible without the risk for kick or severe losses

  • Improved well productivity and increased net present value?


MPD

  • Can drill with BHP ± 2,5 bar (requires automatic choke)

    • Experience from UBO project: ±5 bar

  • Normal annulus friction for drilling at 1900 m is app 0,08 sg or 15 bar.

Max pore pressure gradient

THIS IS POSSIBLE

WITH MPD

Min frac pressure gradient

MPD can be the solution when small overbalance is an advantage


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