Maturing field required help to cost-effectively maintain production
An operator in Gabon wanted to rapidly improve waterflood capacity
in a mature oil field without significant infrastructure modifications or
capex. The REDA HPS horizontal multistage surface pumping system in
place comprised two J350N 49-stage pumps and could achieve injection
rates up to 30,000 bbl of water per day with 66% efficiency.
The system delivered industry-leading efficiency at the time of its
installation and more than adequate reservoir pressure management
during the early life of the field, enabling pressure and flow rate
increases for 10 years. As the reservoir depleted, however, additional boosting was required. The existing pumps were not sufficient, but the
field’s production did not justify major capital investment. Unless an
economical option was found to increase injection to 100,000 bbl/d,
oil production would soon cease.
Smaller, high-efficiency pumps provided a solution
Local engineers developed a new design to replace the J350N pumps
with four N800N 10-stage pumps, which have higher efficiency (82%).
The full system would greatly enhance waterflood capability without
significant infrastructure changes.
Operator quadrupled injection capacity and extended field life
The high-efficiency pumps, along with upgraded thrust bearings and
flanges to accommodate higher flow rates, were installed rapidly using
local support personnel. The system can now deliver up to 124,000 bbl/d,
which is expected to meet both current and future requirements.