Abstract

The paper discusses the aspects of the multi-disciplinary well construction process (WCP) that is being applied in the development of Peregrino field located offshore Brazil. Peregrino field is a heterogeneous sandstone reservoir containing a large volume of viscous oil in a complex depositional geological environment. The field development is based on a large number of long horizontal and multilateral wells equipped with high energy-demanding Electrical Submersible Pumps (ESP) for artificial lift.

The well construction process covers the feasibility, concept selection, detailed plan and execution phases. The efforts towards a multi-disciplinary process allow cost optimization, risk mitigation and production and reserves maximization. Multi-disciplinary teams include not only the usual subsurface disciplines (geophysics, geology, operations geology, petrophysics, reservoir and production technology) but also drilling, completion, topside and operations from an early stage.

In viscous oil fields it is especially important to meet the requirements in reservoir properties, well length and completion design to develop such a field economically. The applied WCP is allowing Peregrino field to achieve its goals in terms of numbers and quality of wells planned and drilled. More than 20 wells have been drilled so far with very good results. Peregrino is now producing at plateau production with a daily oil production potential of 100,000 bbl.

Introduction

Peregrino is currently the largest offshore heavy oil field in Brazil (14 ºAPI density and viscosities up to 400 cP) on production. The field is located in the southern part of Campos Basin, offshore Rio de Janeiro state (Figure 1). The reservoir lies between 2150 and 2350 m TVD MSL at a water depth of 120 m. Statoil is the operator (60%) with Sinochem as partner (40%).

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