Recuperação de fluido de perfuração não aquoso utilizando sistemas microemulsionados

Abstract

There are two research fields essential for the oil market: cost optimization and environmental issues. In the well drilling operations the fluid system is shown to be essential, and thus requires a continuous optimization. Organic based drilling fluids are widely used in these operations, which, after use, become expensive and polluting liabilities. Currently the treatment performed in this type of fluid is only correction, which usually requires large quantities of inputs, further increasing the cost of Fluid System for the drilling operation. Thus, the aim of this study was to develop a method of recovery of non-aqueous drilling fluids through the breaking of the water in oil emulsion using as demulsifying agent microemulsions systems. To obtain the microemulsion system qualitative studies were performed where the influence of different surfactants in the phase separation of the fluid were studied and defined the best efficiency (RNX 95). For mapping of the fluid used in the tests were made rheology analysis, ratio of water / oil / solids, salinity, and electrical stability to study the emulsion breaking was varied: the composition of microemulsion system for the surfactant (RNX 95), the aqueous phase of the microemulsion by using or not salt (CaCl2), the rate microemulsion / fluid system and the temperature at mixture. Test have also been made to the characterization of phases obtained after breaking test, as well as the possibility of reusing the non-aqueous fluid recovered. The tests had a satisfactory result.