Enhanced recovery

Polymer Injection in Deepwater Field Offshore Angola

The polymer-injection project in the Dalia field, one of the main fields of Block 17 in deepwater Angola, represents a world first for both surface and subsurface aspects.

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Fig. 1—Dalia field subsea development layout.

The polymer-injection project in the Dalia field, one of the main fields of Block 17 in deepwater Angola, represents a world first for both surface and subsurface aspects. Thorough, integrated geoscience and architectural studies led to the decision to initiate a polymer-injectivity test on a single well, followed by a continuous injection of polymer on one of the four subsea lines delivering water to the field. The complete paper describes the main results of the pilot phase.

Introduction

A subsea development scheme with water injection for full pressure maintenance was chosen for the Dalia field together with gas reinjection. Very early in the geoscience studies, oil viscosity was identified as the main limiting factor to water-injection recovery.

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