Measuring and testing – Borehole or drilling – Downhole test
Patent
1989-06-12
1990-11-27
Chapman, John
Measuring and testing
Borehole or drilling
Downhole test
175 45, 175 61, E21B 4700
Patent
active
049727036
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 techniques 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 kinemataic, esternal, 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), Soeiinah
patent: 4643264 (1987-02-01), Dellinger
patent: 4715452 (1987-12-01), Sheppard
patent: 4760735 (1988-08-01), Sheppard et al.
patent: 4804051 (1989-02-01), Ho
patent: 4848144 (1989-07-01), Ho
Johancsik et al., "Torque and Drag . . . Prediction and Measurement", IADC/SPE Paper #11380, Feb. 1983.
Sheppard et al., "Designing Well Paths to Reduce Drag and Torque", SPE Paper #15463, Oct. 1986.
Maidla et al., "Field Comparison . . . Friction Evaluation . . . ," SPE Paper #16663. Sep. 1987.
Ho, "Prediction of Drilling Trajectory . . . , " SPE Paper #16658, Sep. 1987.
Brett et al, "Uses . . . Tension and Torque Model . . . ", SPE Paper #16664, Sep. 1987.
Ho, "General Formulation . . . Use in BHA Analysis", SPE Paper #15562, Oct. 1986.
Ho, "An Improved Modeling . . . Torque andDrag in . . . Wells", SPE Paper #18047, Oct. 1988.
Baroid Technology Inc.
Chapman John
O'Shea Kevin D.
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