Cuttings debris may be deposited in the bottom of a horizontal hole because of gravity of the earth.It has lower density than the formation

so cuttings beds can have a significant effect on the density log responses.Monte Carlo method was used to study the effect of cuttings bed on the computed log density

with various formation densities and cuttings bed thicknesses of 0?5 cm in the horizontal borehole.In order to guarantee the reliability of results

simulation results were compared to the experimental data.MC simulations show that the density measurement can be corrected using the ridge-rib graph

if the thickness of the cutting bed is less than 2cm.Otherwise

it is difficulty to correct the effect of the cutting bed on the formation density measurement.Finally

the cuttings beds correction charts and formulas for DSDL-8723 double-detector density logging tool which is in the horizontal borehole are made preliminarily.