Abstract

Chichimene field is a heavy oil field located in the little deformed sector known as the "foreland ‘basin plains of Colombia. This field is located in Castilla La Nueva in the Meta Department in the east part of the country. Chichimene field was discovered by Chevron in 1969 with the drilling of Chichimene-1 well (CH-1), but it only started production in 1.985. Since 2.00 Ecopetrol S.A has been in charge for field operation.

Chichimene field produces a medium crude oil (approximately 20 API) from cretaceous structures named K1 and K2, In 2.01 an extra heavy crude oil (range between 7 – 9 API) from a terciary (T2) formation named San Fernando started production with the CH-18 Well. Despite of the high density presented, the T2 crude oil is mobile at reservoir conditions due to an abnormally elevated reservoir temperature

The interest formation corresponds to an elongated northwest direction tertiary anticline layer, the crude oil discovered in this structure is extra-heavy produced by severe biodegradation and evaporative fractionation processes, the depositional model is associated to a distal marine Cretaceous rock. Nowadays the San Fernando formation produces about 14,000 BOPD using electric submersible pumps (ESP) as artificial lift method.

This paper reviewed the conditions of the reservoir (petrophysical model, PVT properties, Oil, water and gas production behavior), the physical property of the produced fluids and fluid characteristics of foamy oil properties, to establish an appropriate mathematical expression for modeling the performance of these extra-heavy oil wells.

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