Method and apparatus for enhancing directional accuracy and control using bottomhole assembly bending measurements
First Claim
1. A method for drilling a wellbore, comprising:
- extending a bottomhole assembly into the wellbore;
measuring a bending moment M at at least one axial location along the bottomhole assembly; and
estimating a dog leg severity of the wellbore using
δ
=(k×
M)/(E×
I),where M is the measured bending moment, E is the Young'"'"'s modulus for the bottomhole assembly, I is the moment of inertia of the bottomhole assembly, and k is a conversion factor.
1 Assignment
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Accused Products
Abstract
A system for drilling a well comprises a tubular member having a bottomhole assembly at a bottom end thereof disposed in a wellbore. A first sensor is disposed in the bottomhole assembly at a predetermined axial location for detecting bending in a first axis and generating a first bending signal in response thereto, where the first axis is substantially orthogonal to a longitudinal axis of the bottomhole assembly. A second sensor is disposed in the bottomhole assembly at the predetermined axial location for detecting bending in a second axis and generating a second bending signal in response thereto, where the second axis is substantially orthogonal to the longitudinal axis. A processor receives the first bending signal and the second bending signal and relates the first bending signal and the second bending signal to a borehole curvature according to programmed instructions.
73 Citations
21 Claims
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1. A method for drilling a wellbore, comprising:
-
extending a bottomhole assembly into the wellbore; measuring a bending moment M at at least one axial location along the bottomhole assembly; and estimating a dog leg severity of the wellbore using
δ
=(k×
M)/(E×
I),where M is the measured bending moment, E is the Young'"'"'s modulus for the bottomhole assembly, I is the moment of inertia of the bottomhole assembly, and k is a conversion factor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for drilling a wellbore, comprising:
-
a first sensor disposed in a bottomhole assembly at a predetermined axial location configured to measure a bending moment in a first axis substantially orthogonal to a longitudinal axis of the bottomhole assembly; a second sensor disposed in the bottomhole assembly at the predetermined axial location configured to measure a bending moment in a second axis substantially orthogonal to the longitudinal axis; and a processor configured to compute therefrom a dog leg severity of the wellbore using;
δ
=(k×
M)/(E×
I);where M is a bending moment obtaining from the bending moment in the first axis and the bending moment in the second axis. E is the Young'"'"'s modulus for the bottomhole assembly, I is the moment of inertia of the bottomhole assembly, and k is a conversion factor. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification