Purpose. In order to solve the serious problem of borehole deflection in coal mine gas drainage, precision directional drilling tool has been developed and improved, as well general laws have studied. Methods. By using ordinary pipes, one set two sets tools, gas-drainage boreholes drilled and, subsequently, trajectory parameters measured an inclinometer. Findings. The inclination angle first te...

For the current coal mine directional drilling MWD equipment and system are independent of each other, resulting in different forms data at bottom hole, forming islands; Based on B/S architecture mode, by comparing measurement while mode format, requirement module comprehensive acquisition is analyzed; background database integrated collection set up to develop development mine. The verificatio...

This paper proposes a novel smart surgical navigation system for intramedullary nailing in orthopedic surgery. Using a handle-integrated laser guidance module, the system can target a drill insertion point onto skin, indicating an accurate target position to perpendicularly access an invisible distal hole. The proposed handle-integration-based fixation of the laser guidance module precisely def...

During summer 2012 Shell performed exploratory drilling at Sivulliq, a lease holding located in the autumn migration corridor of bowhead whales (Balaena mysticetus), northwest of Camden Bay in the Beaufort Sea. The drilling operation involved a number of vessels performing various activities, such as towing the drill rig, anchor handling, and drilling. Acoustic data were collected with six arra...