Measuring and testing – Borehole or drilling – Downhole test
Patent
1988-10-03
1989-07-18
Levy, Stewart J.
Measuring and testing
Borehole or drilling
Downhole test
175 45, 175 61, E21B 4700
Patent
active
048481440
ABSTRACT:
A method is provided for generating an improved torque-drag model for at least the collar portion of the drill string in a directional oil or gas well. The technique of the present invention determine the stiffness of incremental portions of the drill string, and uses this information, the borehole clearance, and the borehole trajectory to determine the contact locations between the drill string and the sidewalls of the well. The contact force at these determined locations can be calculated, taking into consideration all significant kinematic, external, and internal forces acting on that incremental portion of the drill string. More acurate torque-drag analysis provided by the improved model of the present invention assists in well planning, prediction, and control, assists in avoiding drilling problems, and reduces total costs for the well.
REFERENCES:
patent: 4384483 (1983-05-01), Dellinger et al.
patent: 4549431 (1985-10-01), Soellnah
patent: 4643264 (1987-02-01), Dellinger
patent: 4715452 (1987-12-01), Sheppard
patent: 4760735 (1988-08-01), Sheppard et al.
IADC/SPE Paper #11380 Torque and Drag in Directional Wells Prediction and Measurement by C. A. Johancsik et al.
SPE Paper #15463 Designing Well Paths to Reduce Drag and Torque by M. C. Sheppard et al.
SPE Paper #16663 Field Comparison of 2-D and 3-D Methods for the Borehole Friction Evaluation in Directional Wells by E. E Maidla et al.
SPE Paper #16664 Uses and Limitations of a Drillstring Tension and Torque Model to Monitor Hole Conditions by J. F. Brett et al.
SPE Paper #15562 General Formulation of Drillstring Under Large Deformation and Its Use in BHA Analysis by H.-S. Ho.
SPE Paper #16658 Prediction of Drilling Trajectory in Directional Wells via a New Rock-Bit Interaction Model by H.-S. Ho.
SPE Paper #18047 An Improved Modeling Program for Computing the Torque and Drag in Directional and Deep Wells by H.-S. Ho.
Levy Stewart J.
NL Sperry-Sun, Inc.
O'Shea Kevin D.
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