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Downhole Electrical Heating for Enhanced Heavy-Oil Recovery

Several enhanced-oil-recovery (EOR) techniques (thermal methods in particular) are currently available to achieve higher recovery factors in heavy-oil fields. However, some technologies, such as downhole electrical heating (DHEH), have been improved recently, allowing enhancement of production and therefore improvement of the recovery factor with relatively low investment cost in comparison with the high costs involved in the implementation of thermal technologies. To increase the production of a heavy-oil reservoir offshore Congo, a study of DHEH applications has been carried out with encouraging results.

Introduction

The Zatchi Marine field, operated by Eni Congo in partnership with Total Congo, is located approximately 25 km from the Congolese coast (Fig. 1). It is a multilayered sand reservoir with five oil-bearing levels (A through E). In particular, Level B is a 30-m-thick sand characterized by a large accumulation of heavy and highly viscous oil with the presence of both a bottom and a gas cap and very low reservoir pressure. Water depth ranges from 55 to 57 m, and there is an areal extension of approximately 34 km2.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper IPTC 16858, “Downhole Electrical Heating for Heavy-Oil Enhanced Recovery: A Successful Application Offshore Congo,” by  F. Bottazzi, C. Repetto, E. Tita, and G. Maugeri, Eni, prepared for the 2013 International Petroleum Technology Conference, Beijing, 26–28 March. The paper has not been peer reviewed.
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Downhole Electrical Heating for Enhanced Heavy-Oil Recovery

01 March 2014

Volume: 66 | Issue: 3

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