Detecting and drilling in critical inclination window in slant wells by means of a two phase liquid-solid CFD model and experimental study

الملخص EN

Build and hold from vertical section form slant wells.

The hole cleaning phenomena in these wells can cause many problems that increase the operational costs.

CFD simulation and experimental flow loops are excellent way to study the effect of operational parameters on cutting transport across the annulus.

In this study, a liquid-solid CFD model was built that attempted to verify experimental data.

The effect of cutting size, drill pipe rotation speed, flow rate, drilling fluid type, and rate of penetration are discussed.

The results indicated that there is a specific critical inclination window for slant wells, through with a driller must avoid drilling.

Inclinations between 30 to 55° form this window.

If there is no way to drill in this range, the operator must increase the flow rate as much as possible and reduce the size of the cuttings in different ways.

Increasing the drilling fluid viscosity can also improve hole-cleaning efficiency.