Abstract:

In order to solve target problem of actual drilling trajectory of life support hole during emergency rescue process in mine roadway, analytical geometry method was used for design and modelling of connected trajectory and roadway, and research on design and control method of life support hole trajectory was carried out. Firstly, considering the relative position between wellhead and connecting point, profile type of the trajectory was determined, and a vector calculation method for it was provided. Secondly, in view of the uncertain position of rescue target and high requirements for trajectory control, "increase-stability-increase" design profile was selected, and a segmented trajectory connection design method was proposed. Then, with the goal of reducing uncertainty of rescue target position, a point-to-surface trajectory connection method and a secondary connected trajectory control model were put forward. Finally, based on wellbore design material and actual drilling data, an example was utilized to verify the established model. The results show that the proposed design calculation method avoids tedious calculations and checks, and at the same time reduces length of connected trajectory by 6.7%. Moreover, the trajectory control method overcomes the disadvantages of frequent twisting and azimuth operations of traditional rescue techniques.

Key words: mine roadway, rescue target, life-support hole, trajectory design, trajectory control, second connection