Influence assessment of shut-in duration and well startup sequence in different geological and field conditions

Abstract

During 2019-2021, about half of well stock at West Siberian oil fields were shut down for a long period (up to one and a half year) due to oil production restrictions under the agreement between Russia and OPEC (Organization of the Petroleum Exporting Countries). There have never been such large-scale and prolonged shutdowns before. After starting from a long-term shutdown, the flow rate of some wells increased, while others decreased.The main aim of research is to assess the geological and technological factors affecting the results of starting wells after a long shutdown. Statistical methods were used, including multivariate regression analysis, assessing the influence of parameters on each other using trend lines on cross-plots, as well as constructing and comparing maps of geological and technological parameters.As a result, the influence of the duration of downtime, the simultaneity of shutdown of production and injection wells and compensation of production by injection was determined. That will help to reduce losses in case of repeated production restrictions by selecting optimal candidates for shutdown.