Alan D. Black

Cesium Formate: Results and Analysis of Drilling with a New High Density Unweighted Brine

Full scale laboratory experiments were recently conducted to investigate drilling rates achievable with a new, high density, clear brine fluid, Cesium Formate (CsCOOH). These tests were conducted using industry accepted protocols, including bit selection, rock samples drilled, hydraulics, bit loading, and laboratory drilling apparatus. Control experiments using a hematite-weighted water based field mud were also conducted. This paper presents the data with the authors analysis. In addition, the authors discuss related prior work. The fluid of interest consists of a 18.7 ppg Cesium Formate with additives for viscosity and fluid loss control. These tests are believed to have used the highest density drilling fluid ever for published drilling tests conducted in a controlled full scale laboratory environment simulating downhole conditions.