This paper presents the results of an ongoing rental project at Slavneft (a company belonging on a parity basis to Gazpromneft and Rosneft) within 13 Licence Areas. The main target of Ultra-High-Speed ESP implementation was to address challenges where traditional technologies become inefficient, with the main priority given to production gain. The paper scope is focused on how production gain and power savings were achieved.
Ultra-High-Speed ESP (UHS ESP) Systems have grown in popularity in recent years due to a set of advantages, including power efficiency, wide operating range, robust design, etc. Once the technology reached a level where equipment runlife became superior to standard ESPs (STD ESP), it opened new prospects for exploring various types of business models with lease being one of them. Project scope at Slavneft group of field required solutions for depleting reservoirs in slim casing (5.5" and 5.75"). Since production gain was given high priority, deeper ESP installation was required.
Target KPI's uncovered the benefit of short UHS downhole string length, which allows for deeper installation, where dogleg severity becomes critical and traditional ESP cannot be set. Preliminary results of a three-year project with one-year qualification are as follows:
Net production gain of 13,846 tons of oil (103,200 stb) achieved through deeper installation, average daily production gain 23.9 %;
Flowing bottom hole pressure reduced by 11.8 bar (24.6 %) on average;
UHS ESPs installed deeper by average 252 m (827 ft) than previously installed standard ESP;
Average specific power consumption optimized by 6.1 kW*h/m3 (liquid) or 23.5 %;
Total power saved is over 1,685,553 kW*h.
This case study touches on broader aspects of the rental project, demonstrating specific topics within the area of UHS ESP application. As technology benefits become more apparent and they offer tremendous opportunities for production optimization, with time, the UHS ESP may completely replace standard approach.
The results of this study and a number of other successful projects all over the world have paved the way for a more advanced approach in Artificial Lift. Taking a step forward towards unlocking potential of every well, the final chapter of this paper presents the results of a 7-year long project, aimed at bringing to life a Hyper Speed ESP system, with its speed rating reaching 15,000 rpm. The Hyper Speed ESP designed to provide ultimate solution for ESP lifted wells:
Ready for practically any downhole conditions
Benchmark reliability & efficiency
Rigless live-well deployment
Inexpensive intervention, compact & slim
Paper scope covers technological hurdles and corresponding engineering solutions.