«Oilfield engineering»

Experience of using reverse emulsions as well flushing fluid during wells overhauling at the fields of the Eastern Siberia

UDC: 622.276.7
DOI: -

Authors:

¹ Institute of Geology and Development of Fossil Fuels, Moscow, Russia
² Oil and Gas Research Institute RAS, Moscow, Russia

Keywords: well killing fluid, Khamakinsky horizon, hydrocarbon-based solutions, overhauling of wells, wells productivity

Annotation:

The authors of the article discuss the problems that arise when conducting the ongoing repairs and overhauling of wells in the fields of the Eastern Siberia in conditions of abnormally low reservoir pressures and reservoir temperatures for the B₁₀ formation of the Khamakinsky horizon. It is noted that the use of aqueous solutions for killing wells leads to a 20...40 % decrease of their productivity due to the bottomhole zone colmatation caused by the interaction of water with an increased concentration of anhydrite. To solve this problem, the use of reverse water-oil emulsions is proposed, which prevent deterioration of the reservoir properties and minimize the risk of circulation loss. The authors of the article describe in detail the methods of emulsions preparation based on commercial oil and saline solution as well as provide calculations to achieve the required liquid density. The results of the study prove high efficiency of using these emulsions in conditions of low formation temperatures and making them preferable as compared with traditional water solutions.

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