Progressing cavity pumps (PCP), are suitable for particularly demanding media, such as paraffin and sand mixtures. In an effort to reduce the number of cost intensive pumping installations, the oil field operator, located next to Bremen, has begun to look for an efficient and durable system, which can be installed relatively easily even with deflected holes. The company chose a system with an underground driven progressing cavity pump from NETZSCH.
In order to make the application as effective as possible, NETZSCH offered a combination of a progressing cavity pump with a submersible motor, which was finally installed. It is a so called ESPCP-pump (Electric Submersible Progressing Cavity Pumps), a progressing cavity pump, which is driven underground by a permanent magnet motor.
The design of the ESPCP system, which is installed in Northern Germany, is adapted to local conditions. It can thus convey the highly viscous medium, which contains bitumen and paraffin sediments, sand content of up to 40%, or salt deposits, with a pressure of up to 300 bar. A gas proportion of up to 40% of the pump intake does not pose a problem during extraction, because the technology of the progressing cavity pump allows conveying different phases of a fluid. It also conveys low volumes of 3 to 20 m3/day as efficiently as medium volumes of 10 to 100 m3/day.
In November 2018, the NETZSCH ESPCP system was installed and put into operation in the oil field south of Bremen. It had worked flawlessly until the first unscheduled shutdown of the production well, which was caused by exceeding external limits that were not related to the pump. The system will soon be put back into service. The operator plans to purchase additional systems.