Abstract

This paper presents a research project proposal to ensure the optimum flow assurance for the development of heavy crudes, from offshore reservoirs to delivey points, considering several field facilities, which include optimum application and performance of chemicals to suppress or attenuate the precipitation of organic and inorganic deposits, corrosion inhibitors, as well as the treatment of emulsions produced due to the presence of formation water during production. The interaction between chemicals employed in well stimulation treatments and those used for crude dehydration is also considered.

This proposal intends setting the basis to optimize flow assurance by minimizing the chemical dosage in the production and transportation facilities, maximizing the useful life of the employed chemical products. In order to achieve this goal it is necessary to include;

  • Laboratory studies to characterize heavy oil, water and gas properties and the interactions between the different fluids present, which allow evaluating the generation and stability of emulsions, hidrocarbons stability, and corrosion index of water, for example.

  • Evaluation of chemicals for flow assurance in the reservoir, lifting fluids in production wells, including artificial lift systems, as well as surface transportation and treatment fluids, and the interaction between these chemicals at different points during hydrocarbons production.

  • Generation of reservoir, well completion, wellbore and surface transport models.

Pressure analyses show that production is dominated by high porosity vugs, and that the vertical permeability of vuggy areas is relevant for fields sharing an aquifer due to water channeling and the possible formation of emulsions inside the reservoir in the reion close to the producing wells.

The assessement of the aforedmentioned issues can lead to the control and/or prevention of emulsion formation, solids deposition and corrosion. Besides, addressing each of these issues individually, it is important to assess the influence of a mixture of several chemicals at the bottomhole and surface facilities, providing useful information to anticipate and avoid additional complications derived from the application of several chemicals to address flow assurance problems from the reservoir to the delivery points.

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