...Conclusions The following conclusions are a result of this work: The wellbore sag model can be useful for mud engineers to evaluate the sag behavior at given well conditions. The model evaluations can be used to make speedy decisions at the rigsite to optimize fluid formulations...

.... The maximum mud weight measured on returns at the flowline was 2.145 sg, confirming again that no significant sag had occurred, despite the mud remaining static in the hole for 10 days at 203°C. The well was then drilled to final TD at 7,327 m and the 7-in. liner was successfully run and cemented. Cased...

... Abstract North Sea wells drilled in high-pressure, high-temperature (HPHT) areas are known for presenting barite sag challenges. Fluid densities in the 17.5–18.0 lbm/gal range require a high percentage of barite, and 400°F temperatures can adversely impact the rheological properties needed...

... Table 6 presents a model detailing the contributions towards barite sag potential from the drilling process and drilling fluid. The drilling process variable presented in Table 4 is nominal annular velocity because it is readily available on the daily mud report. The potential for dynamic sag...

... Abstract One important issue for drilling operations is control of down hole pressures. When drilling with synthetic or oil-based drilling fluids, the ability to maintain all the weighting agents in suspension is particularly difficult since these fluids are more vulnerable for sag than water...

...Sag Occurrence The sag incident occurred after a twist-off while drilling the 12¼-in interval at 23,180-ft TD (15,456-ft TVD) with 13.3-lb/gal synthetic-based mud (SBM). Part of the bottomhole assembly (the bit and part of the mud motor) was left in the hole while drilling. The decision...

... solution of the beam-column equations in three-dimensions in a horizontal wellbore with pipe weight. Pipe deflections, contact loads, and bending stresses are determined with explicit formulas. Sag between connectors is calculated so that pipe body contact with the wellbore between connectors can...

... measurement technologies and focused mud management were used to mitigate the risks associated with barite sag, differential sticking, insufficient hydrostatic, formation damage and ECD induced losses. This paper highlights the techniques used on Marnock to successfully manage mud to drill and complete...

... experiences. narrow drilling window drilling fluid formulation drilling fluid selection and formulation emulsifier hpht well iadc spe 59175 operational practice rheology shearwater project procedure sag factor hpht section drilling fluid chemistry sag drilling fluid management...

... Abstract Barite sag under static and dynamic conditions has been studied in the laboratory. Static sag has been related to viscoelastic properties of several fluids. These viscoelastic properties are related to gel formation which needs to be sufficient to keep barite in suspension. This static...