Campos basin reservoirs are responsible for an average oil production of 1.2 million bpd (83.5 % of Brazil's total production) with a forecast of 1.6 million bopd by the end of 2005.

cThis production comes from forty-one oilfields located between 50 to 140 km off the Brazilian coast (under water depths from 80 to 2.400 m) displaying a variety of reservoirs including Neocomian fractured basalts, Barremian coquinas, Early Albian calcarenites and late Albian to early Miocene siliciclastic turbidites (most frequently)(1).

Scaling risk for new fields is usually assessed in time as an input in the development phase of field projects. In order to guarantee a reliable formation water sample, from appraisal or development wells, a protocol was created based on data from twenty-six bottom-hole samplings. Correlations between produced fluid volume, porosity and permeability of the reservoir and the contamination degree were determined and used to define the minimum time of pumping necessary to have non contaminated samples.

This paper outlines the scaling tendency of the main fields from Campos Basin, based on the chemical composition of the waters and its association with the reservoir types. Scale risk of the fields is an important tool to be considered on the development phase project to support the decisions related to the appropriate technology to be adopted.

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