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Abstract: Geological Aspects of the First Horizontal Well Drilled in Romania

Cornelia Baleanu

In 1979 on the Lebada East field of the Romania Offshore of the Black Sea between the Albian and the Eocene hydrocarbon accumulations, the Upper Cretaceous hydrocarbon accumulation was discovered.

Situated in the Coniacian-Santonian and Turonian limey rocks, this accumulation cannot be produced efficiently by conventional wells.

Some geological aspects which characterize the field such as: the physical properties of the reservoir rocks the low effective thickness, heterogeneity, the vertical fissure and microfissure system and other production and economic aspects led to the conclusion that oil can be produced efficiently by horizontal wells or high angle wells.

The benefits of horizontal well trajectory to produce the oil from the reservoir with this geometry are many and they were proved by the high rate of production as compared with the production tests of the vertical wells.

After a long period of time when the reservoir was considered to be economically inefficient it can be finally produced.

AAPG Search and Discovery Article #90956©1995 AAPG International Convention and Exposition Meeting, Nice, France