New Method for Calculating the Upward Flow Velocity of Tripping Gas on Site

In the process of logging, the accuracy of gas upward flow velocity calculated is very important because it serves as the important basis for safely drilling and formation pressure surveying. The new calculation method in this paper takes into consideration of the influence of displacement of drilling tool on the gas channeling height during running in the hole as well as other influence factors. To a certain extent, this method can improve the accuracy of calculation.