Subsea Production Optimization in Field BC-10 Offshore Brazil

Topics: Subsea systems
Fig. 1: Schematic of the entire caisson and ALM (top left); the support structure, 42-in. conductors, and the manifold on top (top right); ALM populated with four MOBOs (bottom right); closeup of the TEA, showing it attached to the 32-in.-inner-diameter caisson; this forms the MOBO (bottom left).

The BC-10 asset, located in deep water offshore Brazil, produces heavy oil in the range of 16 to 24 °API. Mudline caisson separators with electrical submersible pumps (ESPs) are used to process fluids from multiple wells and boost them to the receiving floating production, storage, and offloading (FPSO) vessel. There are significant flow-assurance challenges in operating the asset. In this paper, two examples of production optimization for this field will be provided (further examples are available in the complete paper).

BC-10

BC-10’s production comes from four fields located in water depths ranging from 1650 to 1920 m and is dependent on artificial lift. This summary focuses on optimizations involving the Ostra field. The subsea architecture that enabled the development of these separate reservoirs consists of multiple drill centers coupled to production manifolds. Manifolds are routed to caisson ESPs. These caisson ESPs will henceforth be referred to as MOBOs (derived from the Portuguese acronym for pump-boosting module). To minimize equipment costs, each field has only two production flowlines routed to the host: one is for production, and the second is for hot-oil displacement and production. In the case of Ostra, a third riser for gas separated subsea is also present. This design reduces the number of risers required. In line with this philosophy, there are only three oil-production trains and one gas separator on the host.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper OTC 26220, “BC-10: Optimizing Subsea Production,” by N.C. Sleight and N. Oliveira, Shell, prepared for the 2015 Offshore Technology Conference Brasil, Rio de Janeiro, 27–29 October. The paper has not been peer reviewed. Copyright 2015 Offshore Technology Conference. Reproduced by permission.
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Subsea Production Optimization in Field BC-10 Offshore Brazil

26 April 2016

Volume: 68 | Issue: 5