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Beneficiarymining-Research on Prediction Method of Directional Borehole Trajectory in Coal Mine
Release time:
2019-05-09
Author:
Source:
Abstract: (Abstract): In view of the problems that the three-point fixed circle method does not consider the force deformation of the drilling tool and the related parameters of the vertical and horizontal bending beam method are difficult to obtain in the traditional drilling trajectory prediction method, a new method of coal mine directional drilling trajectory prediction is proposed, which uses the vertical and horizontal bending beam theory to improve the three-point fixed circle method. According to the theory of vertical and horizontal bending beam, the method analyzes the force of the single-bending screw drill assembly, derives the three-bending moment equation, obtains the second span length L2 formed after the bending deformation of the drill assembly, and substitutes the three-point circle method, calculates the predicted slope of the drill assembly under different force conditions, and realizes the directional drilling of the coal mine near-horizontal kilometer.
Key words:
Coal mine, bending, prediction, trajectory, borehole, vertical and horizontal, point, theory, drill pipe, spiral drill pipe, geological drill pipe, drill bit
