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WEG Middle East has engineered and supplied 250kW HGF motors to fit in the same space envelope previously occupied by three 132kW Loher pump motors at the Daleel Petroleum Oil Field in Oman.

The ability of WEG to provide the motors and VFD drives is enabling Daleel Petroleum to increase the output of three crude oil shipping pumps by 45 per cent respectively; each pump now being capable of shipping 16,000bpd (barrels per day), instead of 11,000bpd previously.

This increase also offers the advantage of enabling one pump to be withdrawn at any time for maintenance, without Daleel Petroleum incurring penalties for falling below its contracted pumping rate of 30,000bpd.

Located in a remote area of Oman, the Daleel Petroleum Oil Field is responsible for a series of exploration and production wells.

The crude oil is collected via a series of pipelines and manifolds, treated to remove water, sand and salt to meet the specification set by Petroleum Development Oman (PDO), and then stored in large tanks.

The next stage of the process is to pump the oil from the storage tanks to the PDO pipeline network; this is the task of three crude oil shipping pumps.

The WEG package comprised three 250kW, 315C/D/E HGF two-pole motors, plus three CFW-09 variable speed drives assembled into control cabinets.

The panels housing the VSD are located 150m away from the pump motors in an electrical control room where the temperature can be controlled, usually below 30C, even during the summer when temperatures outside may reach 55C.

In addition to the panels, the control room also houses load reactors, which were also supplied by WEG.

These are required to compensate for the capacitive effects of the long cable runs between the motors and inverters.

WEG’s engineering support in the installation and commissioning of the motor/control packages provided by Luciano Rottava da Silva, an automation specialist, and Gurpreet Singh Anand, a motor applications engineer, was crucial in ensuring continuity of production at the Daleel Station.

The electrical installation for the first motor provided a pattern for the subsequent two installations, enabling a host of tasks to be undertaken in advance before the two other panels arrived in the site.

After the complete installation of the first motor and its associated panel/VSD, the HGF motor was run uncoupled without load for 24 hours.

Once this period had elapsed, WEG coupled the pump to the motor and started another 24-hour test run, this time simulating a real operation.

When this test was concluded, the motor continued in normal operation, providing improved pumping performance of up to 16,000bpd, compared with the 11,000bpd available from the original pump sets.

To date, two of the three motors and their VSD control panels have been installed, enabling Daleel to meet its daily pumping capacity even before the final motor package is installed.

The new motors benefit from soft start characteristics and the more controllable operation provided by VSD.

This helps with motor reliability and life, and also provides Daleel with the potential to reduce its costs on the running of the pump motors due to improved energy efficiency.

WEG Electric Motors

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