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As the development of petroleum technology, the slim hold drilling and the directional drilling are
developed. Currently this technology has been applied in the technology industry, but these studies are still
insufficient. This study has been proceeded with a annulus(the ratio of radius is 0.7 between inner pipe and
outer pipe) which is able to change inclination. Variations of the inclination, the particle injection rate, RPM
(the inner pipe rotation speed) and the type of fluid were used in the experimentation. RPM is changed 0rpm
to 400rpm. The particle injection rate is 4-16%. The inclination is 0°-60°. Two type of fluid which are CMC
at concentrations in range of 0.2-0.8%, and 5% Bentonite solution are used on this study. The sand which is
used in experimentation is 2mm homogeneous size. The transporting ratio and the pressure loss are defined
with the different type of fluid through the experimentation.