... in specific gravity in most commercial grades. This has led to renewed interest in alternative weight materials. Ilmenite and hematite are two minerals that have been used sporadically in the field. Compared to barite, their higher density impacts both the rheology of the fluids and the settling rate...

... of the weight material is removed. A significant reduction in weight material particle size has the potential to demonstrate a different behavior. This paper will present data obtained from both the field and from specifically designed yard tests conducted on micronized weighted drilling fluids. The data...

... be minimized significantly. At the same time, sag stability must be optimised to reduce the risk of influx or hole instability. Operations in narrow annuli often result in very low flow rates. Anytime the gel structure formed to keep weight materials suspended are broken while at the same time the flow rate...

... The magnetic susceptibility for a material describes how it becomes magnetized by an external magnetic field 4 . Drilling fluids have mostly small positive susceptibility values, and are said to be paramagnetic. The paramagnetic property is due to the base fluid, the weight material and steel...