Oilfield Glossary
Oilfield Glossary
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cesium formate

1. n. [Drilling Fluids]
A neutral to slightly alkaline salt of cesium hydroxide and formic acid having the formula HCOO-Cs+. It is extremely soluble in water. An 82 wt.% cesium formate solution has a density of 2.4 g/cm3 [19.9 lbm/gal]. It has shown favorable health, safety and environmental (HSE) characteristics in laboratory tests and has applications as a drill-in, completion or workover fluid. Cesium formate can be mixed with less expensive potassium formate to make clear brine mixtures with a density range from 1.8 to 2.4 g/cm3. Formates have temperature stability in the range of 375°F [190°C], depending on the duration of exposure to such a temperature.