Celsium Formate is chemically represented by the formula CsCOOH. Celsium Formate is prismatic crystals organic salt and readily soluble in water. Celsium Formate is available as stock, clear fluid which can be used in drilling, completion and perforating operations that require a density to 18.6ppg(2.23SG) and a base liquid for drill-in fluids. It owns all the advantages of Potassium Formate and Sodium Formate brines, especially in many HPHT applications. It has been utilized successfully in over 170 of HPHT wells in 36 oilfields around the world. Celsium Formate passed rigorous field test with a density up to 19.2ppg(2.30SG) and temperatures stable up to 215℃(419°F) as long as 18 months application. It can be used in highly deviated and long horizontal wells, as well as low permeable oil/gas and condensate reservoirs.