«Onshore and offshore oil and gas well construction»

Features of mixing different types of water for injection into the reservoir pressure maintenance system

UDC: 622.276.66
DOI: 10.33285/0130-3872-2022-7(355)-41-47

Authors:

¹ National University of Oil and Gas (Gubkin University), Moscow, Russia

Keywords: low-pressure reservoirs, swelling of clay cements, displacement factor, water salinity, reservoir charactristics

Annotation:

The research results described in the article showed that the transition to fresh water injection leads to the pressure gradient increase, the residual oil saturation decrease and the oil displacement efficiency increase. The injection of fresh water into low-permeable reservoirs, containing a clay cement, leads to 2–5 % displacement efficiency at the final stages of development. A decrease of the injected water mineralization at the initial stages of development (especially for low-permeable reservoirs) causes swelling of clays and a decrease of the reservoir properties of the well bottom zone and flooded sections of the reservoir.

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