PREVENTING INORGANIC SCALE FORMATION IN THE UZEN AND ZHETYBAI FIELDS BY USING SCALE INHIBITORS

Abstract

Development of the oil industry in Kazakhstan at the current stage is characterized by a decrease in the quality of the raw material base.  In the total balance of fields under development, the fields that have entered the late stage of development prevail and, consequently, there is a significant deterioration in their structure, an increase in the share of hard-to-recover oil reserves, watering of beds and well production.One of the main challenges during the development of the field is the deposition of inorganic salts in the oilfield equipment.

This article describes the main reasons for the formation of solid inorganic deposits in oil fields, methods of scale inhibitors, as well as the classification of scale inhibitors. Presents the physical and chemical characteristics of the objects under study: the properties of oils and watersof Uzen and Zhetybai oil fields and the chemical reagents – inhibitors of scale formations.

Based on the results of laboratory studies, scale inhibitors were selected, which showed high efficiency (90 - 100 %) to prevent the precipitation of CaCO₃, CaSO₄ and BaSO₄ under the conditions of Uzen and Zhetybai oil fields.

The study was conducted in the center of scientific and laboratory research branch of KMG Engineering LLP "KazNIPImunaygas".

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