«Oilfield engineering»

Assessment of the feasibility of alternate bottom-up mining of low-permeable oil reservoirs by all well grids in small multi-layer fields of the Western Siberia

UDC: 622.276.1/.4
DOI: -

Authors:

¹ TERM Design Bureau, Tyumen, Russia

Keywords: the Western Siberia, multi-layer oil fields, shallow deposits, low-permeable formations, development facilities, well conversion, temporary operation, oil production, well return, impact on oil recovery factor

Annotation:

The author of the article discusses the practical experience of temporary using well grids of upper low-productive formations for reserves recovery from lower higher-flow-rate objects at some multi-layer fields of the Tyumen region. The additional oil production due to the implementation of the studied event at four oil fields of Yuganskneftegaz LLC (former Glavtyumenneftegaz) is estimated.
In alternative option for developing a small two-layer low-permeable oil field of the Khanty-Mansiysk Autonomous Okrug – Yugra is considered, providing for sequential development of formations by both well grids according to the "bottom-up" principle. Technical and economic indicators of the development of the two studied options (discounted income, internal rate of return, profitability index, payback period) are compared.
The advantage of the traditional approach to identifying production facilities by drilling and operating them with independent well grids throughout the entire development period is shown using the following indicators: oil production level, accumulated oil and liquid withdrawals, accumulated water-oil factor, specific oil production per one well, withdrawal of initial reservoirs, recovery factor, etc.

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