Use EPCON CFU technology for optimal separation
To overcome the issues presented by oil-in-water emulsion, Schlumberger
collaborated with three production chemical vendors to identify the best
chemical type, injection location, and injection rate. Initial tests posed
several challenges, so manual bottle tests were conducted using produced water
samples. Within 48 hours of the bottle tests, a drum of the effective chemical
was delivered on site and deployed in the produced water treatment system.
Immediate results were observed at the same injection concentration as
determined during the bottle tests.
Over the next several days, the produced water treatment system was
further optimized and subsequent tests were conducted. Schlumberger deployed
the EPCON CFU compact flotation unit technology, which separates oil from
produced water with smaller volumes and shorter retention time compared with
traditional flotation units. When the chemical was used in conjunction with the
EPCON CFU technology, consistent oil-in-water levels below 50 ppm were
Downstream of the EPCON CFU technology, a dual-pot cartridge filter
system from M-I SWACO, a Schlumberger company, was installed, which further
reduced oil-in-water levels to less than 10 ppm.
Achieved water quality requirements needed for reinjection
Using the engineered solution, Petrogas Rima successfully treated the
produced water to 10-ppm oil-in-water discharge, exceeding the 50 ppm
oil-in-water requirement. This enabled the operator to reinject the produced
water back into the Rasha field to maintain reservoir pressure and assist
For this job, Schlumberger also provided the central control and motor
care control buildings, other office and storage buildings, nitrogen packages,
air compressors, interconnecting piping, associated valves, and
instrumentation. All of the equipment needed for this job was delivered within
10 weeks as requested by the Petrogas Rima.