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Producing Viscous Fluids

Authors
Guy Lebourgeois (Richmond Exploration Co.)
DOI
https://doi.org/10.2118/806-G
Document ID
SPE-806-G
Publisher
Society of Petroleum Engineers
Source
Journal of Petroleum Technology
Volume
9
Issue
05
Publication Date
May 1957
Document Type
Journal Paper
Pages
27 - 29
Language
English
ISSN
0149-2136
Copyright
1957. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
Disciplines
5.1.1 Exploration, Development, Structural Geology, 4.1.5 Processing Equipment, 4.2 Pipelines, Flowlines and Risers, 2.4.3 Sand/Solids Control, 3 Production and Well Operations, 1.6 Drilling Operations, 4.1.2 Separation and Treating, 3.1.1 Beam and related pumping techniques
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Abstract

The discovery in March, 1946, of the Boscan low gravity-high viscosity crude oil accumulation presented the Richmond Exploration Co. with a multitude of problems almost unique in the industry.

Solution of these problems through experience and cut-and-try methods has resulted in the successful development of a large source of rod-building materials.

Introduction

Among the oil companies operating in Venezuela, to which heavy crude means some 14° to 15° API gravity oil, the name Boscan has practically become a synonym of "viscous fluid." Indeed, Boscan crude has an average 10° API gravity fluctuating from 9° to 12° and an average viscosity of 26,000 SSU at 122°F fluctuating from 17,000 to 50,000 SSU. This asphalt-looking oil has to be pumped out of the ground, shipped 25 miles away and loaded on tankers.

When the Boscan field was discovered, the technical obstacles brought up by the physical characteristics of its crude made questionable the commercial exploitation of a petroleum so difficult to produce. However, three years later, Richmond was shipping 14,000 B/D of Boscan crude. Even if the figure does not seem impressive, it means the practical answers to a large sequence of major production problems which had to be solved within the rates of the available equipment through constantly improving methods and designs. The drilling of a Boscan well is not a difficult task; it is when the rig is removed that obstacles start arising.

Geology

The Boscan field is located 26 miles southwest of Maracaibo in the State of Zulia in the western part of the Maracaibo basin.

The stratigraphic sequence encountered in and above the production section in the Boscan area includes Eocene, Oligocene, Miocene and Pliocene sediments. The Upper Eocene consists of the Las Flores formation with interbedded sands and dark gray carbonaceous shales. In the upper part, two zones of beach and bar sands (designated as Upper Boscan and Lower Boscan) produce heavy oil.

The Lower Oligocene overlies the Eocene and contains poor to well developed beach sands interbedded with light gray sandy claystone. Effectively permeable sands in this formation (designated Basal Icotea) locally are oil productive. The middle of Oligocene, principally claystone, contains thin sands which are oil productive in the eastern part of the field. This is Middle Icotea.

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