3D visualization of hole trajectory in directional well drilling

MWD had been used to monitor hole trajectory.

During the drilling, it is difficult to accurately measure or describe a great deal of influencing factors on hole trajectory.

It is necessary to depend on the control technology of borehole trajectory to drill the extended_reach well successfully.

Off-target distance is a key index for measuring quality of borehole trajectory,of which the key is to find out solution to coordinates of target points.

Cylinder helix method is one of the most commonly used methods for borehole trajectory calculation in respects of drilling trajectory monitoring,target-entering analysis & prediction and well bore quality evaluation.

Geologic steering of the horizontal well drilling is the real-time monitoring technique for realizing the geologic steering of the horizontal well drilling based on reservoir prediction and through geologic and engineering parameters measurement, this technique is quite suitable for horizontal well track control, especially drilling in the thin oil-gas layers of the complicated fault blocks.

This paper expresses the change regulation of directional well track by establishing a mathematical model of well tracks and adopting the average angle method to program out true vertical depth, bottom coordinates and dogleg angle.

A novel method for predicting wellbore trajectory based on support vector machine;

A model for design of three-dimensional multi-target wellbore trajectory based on restricted optimization;

Calculation of apparent projection length of actual wellbore trajectory;