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US 7,136,795 B2Granted
Control method for use with a steerable drilling system
AssigneeSchlumberger Technology Corporation
InventorGeoff Downton
Life of this patent
Estimating the term…
Abstract
A control method for use with a steerable drilling system comprises the steps of inputting parametric model data representative of drilling conditions and using the data to determine achievable drilling directions.
Claims3
A method of predicting the operation of a steerable drilling system comprising the steps of:
- calculating an ideal reachability ellipse using the equations:
- Build
- =
- W
- build
- *
- [
- WOB
- -
- meanWOB
- meanWOB
- ]
- +
- R
- build
- *
- [
- ROP
- -
- meanROP
- meanROP
- ]
- +
- P
- build
- *
- [
- Pressure
- -
- meanPressure
- meanPressure
- ]
- +
- F
- build
- *
- [
- Flow
- -
- meanFlow
- meanFlow
- ]
- +
- M
- build
- *
- [
- RPM
- -
- meanRPM
- meanRPM
- ]
- +
- T
- build
- *
- [
- Torque
- -
- meanTorque
- meanTorque
- ]
- +
- I
- build
- *
- [
- sin
-
-
- Inc
- -
- mean
-
-
- sin
-
-
- Inc
- mean
-
-
- sin
-
-
- Inc
- ]
- +
- K
- B
- *
- [
- BuildDemand
-
- %
- ]
- +
- C
- BT
- *
- [
- TurnDemand
-
- %
- ]
- +
- build
- bias
- and
- Turn
- =
- W
- turn
- *
- [
- WOB
- -
- meanWOB
- meanWOB
- ]
- +
- R
- turn
- *
- [
- ROP
- -
- meanROP
- meanROP
- ]
- +
- P
- turn
- *
- [
- Pressure
- -
- meanPressure
- meanPressure
- ]
- +
- F
- turn
- *
- [
- Flow
- -
- meanFlow
- meanFlow
- ]
- +
- M
- turn
- *
- [
- RPM
- -
- meanRPM
- meanRPM
- ]
- +
- T
- turn
- *
- [
- Torque
- -
- meanTorque
- meanTorque
- ]
- +
- I
- turn
- *
- [
- sin
-
-
- Inc
- -
- mean
-
-
- sin
-
-
- Inc
- mean
-
-
- sin
-
-
- Inc
- ]
- +
- K
- T
- *
- [
- TurnDemand
-
- %
- ]
- +
- C
- TB
- *
- [
- BuildDemand
-
- %
- ]
- +
- turn
- bias
- inputting data representative of actual drilling conditions into a parametric model;
- calculating predicted build and turn gain, cross-coupling and bias values to derive build and turn responsiveness values attainable under given operating conditions from the parametric model to produce a predicted reachability ellipse;
- plotting the predicted reachability ellipse and ideal reachability ellipse on a diagram to compare the predicted build and turn responsiveness to the ideal response for one or more sets of operating conditions.
216 more elements
Dependencies are inferred from the claim text.