УДК 622.276

DOI: 10.21440/0536-1028-2019-8-14-20

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Tsidaev B. S. An integrated approach to hydrocarbons offshore mining optimization in the waters of the northern Caspian sea in difficult geological conditions. Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal = News of the Higher Institutions. Mining Journal. 2019; 8: 14–20 (In Russ.). DOI: 10.21440/0536-1028-2019-8-14-20

Abstract

Research aim and objectives. The article highlights the development of the Caspian shelf, identifies prospects and options for further development of oil and gas production in the Caspian.
The aim of the work is to conduct a comprehensive assessment of the new technology of “smart completion”. To achieve the goal, the following tasks were solved: optimization of fluid inflow to the well and prevention of gas from the gas cap and bottom water breakthrough into the well; integrated monitoring and control of the reservoir zones in real time without additional downhole operations.
Research methodology. When drilling horizontal wells undersea, the task of geosteering comes to the fore. It required the integration of seismic data, reservoir tilt measurements, GTI and GIS data and was carried out in real drilling mode. The applied technique provided visualization of the reservoir structure, which allowed for geosteering in accordance with the strategic objectives of the field development. Detailed mapping of bed elements and fluid contacts in real time provides critical information in order to avoid going beyond the reservoir.
Research results and analysis. The inexpediency has been determined of operating with extended lengths of phase-by-phase zones of oil rims with active bottom water without well fluid inflow profiles control devices. This scheme allowed to optimize the profile of well fluid flow into the well, reducing the risks of water and gas premature breakthrough. The solution to this problem, namely the reduction in the volume of breakthrough gas and/or water into the borehole, is through active jointing of zones.
Summary. This complex allows real-time monitoring and control of reservoir zones in the reservoir without additional downhole operations. Thanks to this, the technologies of smart wells provide maximum drainage area of the reservoir and increase oil recovery of the reservoir. An assessment of the new technology of “smart completion” of production wells with long horizontal sections has been carried out.

Key words: shelf; Caspian sea; field; drilling of horizontal wells; geosteering; smart completion.

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Received 1 October 2019