Real Time Optimisation Approach for 15,000 ESP Wells

Abstract

In Rosneft Oil Company 90% of production is provided by 15 000 ESP wells. That is why monitoring and efficiency increasing of those wells are of current importance. Up to recent time, analysis and optimisation were done regularly on monthly basis, while real time monitoring systems were oriented mainly to keep books of oil production. In our opinion implementation of real time monitoring and control systems and reducing analysis and optimisation cycle to days may increase production by the means of rate increase and downtime reduction. Research in this area started in Rosneft in late 2006 in the framework of New Technologies System. Currently there are solutions for data gathering and proceeding, worked out information use in business processes, has practice in production increase and well downtime reduction, started company-wide application of system. Paper includes cases of well regime analysis done with the described system. An important question of quantative evaluation of system applicability for certain conditions was examined. This paper may help to take decision on application of this type of systems for other companies. Introduction In Rosneft Oil Company 90% of oil production is provided by 15 000 ESP wells. That is why monitoring and efficiency increasing of those wells are of current importance. Up to recent time, analysis and optimisation were done regularly on monthly basis, while real time monitoring systems were oriented mainly to keep books of oil production. Monthly efficiency calculations include estimation of production potential - maximum possible oil rate for that well that could be provided by lowering down bottomhole pressure (frequency increase or bigger pump installation) or increasing well productivity (fracturing) and comparing it with the current oil rate. This "simple» comparison is based on large amount of data collected (liquid rate, water cut, annulus pressure, fluid level, GOR, …) and engineering calculations for bottomhole pressure calculation, estimation of current well productivity, etc. [1] Analysis of current wells' regime efficiency shows that there is a potential of increasing oil production (in terms of oil rate increase and well downtime reduction) by the means of introducing monitoring and control systems and processes and shortening up analysis loop to days (see example - "Figure 1. Monthly based analysis"). Experience of real time ESP monitoring and control systems application in other companies shows that there might be an effect of production increase by 2–10% and cost reduction by 5–25% [2]. Research in this area started in Rosneft in late 2006 in the framework of New Technologies System to define the value of those systems application, to check its applicability and plan company-wide application.