Abstract
During the microhole horizontal well drilling, cuttings are easy to deposit at the bottom of wellbore due to gravity. Inadequate cuttings removal from wellbore can cause costly problems such as excessive drag, and even mechanical pipe sticking. This chapter experimentally and numerically investigates the cuttings transport efficiency in a horizontal wellbore. The effects of flow rate, cuttings diameter, rate of penetration, eccentricity, and wellbore diameter on the wellbore-cleaning efficiency are analyzed. A model for predicting cuttings volumetric concentration and cuttings bed height is proposed using the dimensional analysis method. The limitations of proposed model in this study are also discussed. These results could provide a factual basis for improving the microhole drilling hydraulics.
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