Estimating the Economic Impact of Wellbore Positioning Errors on Reservoir Recovery

Outline of Talk

1. Synthesis of wellbores with systematic and random errors
2. Underlying error models
3. Assumptions on the oil recovery envelope
4. Simulation results

Wellbores may not be where we think they are

1. Numerous error sources in MWD measurements cause significant uncertainty in the wellbore position.

Impact of Wellbore Placement Errors

1. Positional uncertainty has a cost:
   1. Risk-1: Wellbore collisions
   2. Risk-2: Reduced oil recovery
   3. Risk-3: Infraction of lease lines
   4. Risk-4: Poor geological models
2. We have developed an open web-based simulator to quantify the economic impact of Risks 1 to 3.

MWD Survey Error

1. The ISCWSA error model provides a method to compute systematic and random survey errors
2. Coefficient values are provided by OWSG consolidated tool codes
3. Error model coefficients differ by:
   1. Magnetic reference model
   2. Survey corrections 

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Estimating the Economic Impact of Wellbore Positioning Errors on Reservoir Recovery

 

Stefan Maus - MagVAR

Shawn DeVerse - Surcon

Lisa Grant - Noble Energy

 

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