Effective fluids management is essential in well construction operations in order to reduce cost, well control incidents, environmental impact, formation damage and formation evaluation problems. It is particularly important to reduce losses and contamination of high-value drilling and completion fluids. Cesium formate brine, being both high-value and limited supply, requires very careful husbandry at all times. Gross contamination of cesium formate brine with other aqueous fluids may significantly reduce its value. In order to minimise fluid losses it is essential to first map out where the losses typically occur in a well construction project and then understand why and how they occur. This chapter of the manual presents the analyses of the complete life cycle of a high-density formate brine fluid, including supply, application and return. Detailed guidelines for planning and preparation, supply, rig storage and surface handling, wellbore operations, sub-surface exposure, brine recovery and return, and finally brine reclamation are provided.

 

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