Boring or penetrating the earth – Automatic control – Of boring means including a below-ground drive prime mover
Patent
1987-09-25
1989-02-14
Massie, Jerome W.
Boring or penetrating the earth
Automatic control
Of boring means including a below-ground drive prime mover
73151, 175 45, E21B 708
Patent
active
048040517
ABSTRACT:
The methods disclosed herein incorporate the basic concepts and methodologies of a new general rock-bit interaction model useful in predicting and controlling drilling trajectories in directional (and deep vertical) wells. It accounts for the anisotropic drilling characteristics of both the formation and the bit. The model is developed in a 3-D geometry. Therefore, it is capable of predicting the walk tendency and the build-drop tendency of a given BHA (bottomhole assembly) under any drilling condition. The model can be used in the forward mode to predict the drilling direction; in the inverse mode to generate the rock and bit anisotrophy indices; and in the log-generation mode to generate drilling logs, such as a drilling dip log.
REFERENCES:
patent: 4015673 (1977-04-01), Craig, Jr. et al.
patent: 4303994 (1981-12-01), Tanguy
patent: 4449595 (1984-05-01), Holbert
patent: 4452075 (1984-06-01), Bockhorst et al.
patent: 4662458 (1987-05-01), Ho
SPE Paper No. 16658 by H-S. Ho, "Prediction of Drilling Trajectory in Directional Wells Via a New Rock-Bit Interaction Model", presented at 62nd Annual Technical Conference and Exhibition of the Society of Petroleum Engineers held in Dallas, TX, Sep. 27-30, 1987.
Massie Jerome W.
Neuder William P.
NL Industries Inc.
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