Study Findings


Closely studied cuttings transport and hydraulics of foam in horizontal and highly deviated wellbores Predicted cuttings critical deposition velocity. The author developed a mechanistic model that describes cuttings transport with foam. The study proposed additional methods to calculate the cuttings bed thickness.


Developed a hole cleaning model for coiled tubing operations using foam correlations. The model was used to determine the anticipated velocities, pressures, and rates.


Developed model for cleaning wellbores with different well configurations and eccentric annuli. The model predicted the bed height for a range of inclination angles at various operating conditions. The authors developed a deposition velocity correlation that can determine the thickness of the cuttings along the wellbore.


Numerically analyzed the cuttings transport in horizontal wells with foam as the carrying fluid. The new critical foam velocity correlation determines the minimum foam flow rate required to remove cuttings from the highly deviated sections of the wells.

[18] [19] [21]

The authors highlighted foam modeling efforts in horizontal wells. The Herschel Bulkey number (Hb) can be a good indicator of the ratio of the final weight of particles removed from the deviated section of the pipe to the initial weight of particles (HCE). This number considers the velocity profile of the fluid and its rheology. The design of drilling fluids by using the value of Hb is more justifiable, especially for fluids with a high shear rate.


Analyzed real-time data to improve the cleaning procedure by identifying trends in data obtained from downhole tools. A road map was created by optimizing critical factors that directly influence coil tubing plug drillout procedures. The engineering approach provided successful, consistent, and repeatable outcomes.


Used statistical analysis to correlate KPIs with operational variables. The study’s goal was to present the operators with an assessment tool to evaluate the benefits and costs of various plug technologies, providing the best strategic placement to execute interventions safely and effectively.