Abstract
The pressure drop characteristics of negative pressure sampling drill pipe were studied experimentally in this work. The pressure drop was measured by a customized designed negative pressure sampling test system. The effects of the inner diameter of the drill pipe, the solid-gas rate and the inlet air velocity on the internal pressure drop of the drill pipe were analyzed. When the drill pipe is loaded under the same inner diameter and air velocity, the pressure drop of the drill pipe increases as the solid-gas rate increases. With the same inner diameter and solid-gas rate, the rate of gas phase pressure drop to solid phase pressure drop increases with the increase of air velocity. Through the experimental pressure drop data, the additional pressure drop coefficient model is established by dimension analysis method, which can accurately predict the pressure drop of the drill pipe. The maximum error between the modeled value and the measured value is –16.2%.
Published Version
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