Seawater used as water supply offshore

Offshore there are manned and unmanned platforms, depending on the tasks to do.  Normal production platforms are mostly unmanned, as there is no personal needed to operate such a place. On manned platforms, either for drilling, a FPSO or other treatment facilities, there are several people constant stationed. Not only the people need drinking water, but there is a lot of water needed for technical purposes such as cooling or producing steam, etc.
As it is impossible to bring in the water from onshore, water has to be produced on this platforms, for this seawater is used. The seawater gives technical a lot of problems. It is highly corrosive, there might be a lot of minerals solved in the seawater, causing scaling, and in warmer environments a lot of bio activity in the seawater can be found.

 

Seawater used to pressurize the reservoir

Seawater is as well used to pressurize the reservoir. This is done offshore off course but as well in parts of the world where there is no sufficient supply of sweet water, sea water is often the only option. For this purpose seawater is sucked from the sea and often untreated direct pumped through so called injection wells in the reservoir.
As always this seawater causes problems with corrosion and or scaling. The scaling of the pipes where the water is pumped down again gives a lot of problem, and if there is too much scale not sufficient water can be pumped down, to sustain the pressure. This seawater is also made responsible for the SRB, the bacteria which again cause corrosion.

 

Merus controls the whole water system on platforms

Merus has won a contract to equip more than 20 platforms in Far East. There the whole water system is taken care off. For this task Merus is installed at 15 to 30 locations. Direct after the sucking pumps, where seawater is pumped up form the sea, and ahead of the different machines  such as compressors, coolers, the drinking water supply, etc. By doing so the corrosion is brought under control, and there are far less problems of leaking, or brown water.

 

Less corrosion gives less problems and a longer lifetime to the assets

Before not seldom certain critical lines have to be replaced very often, we know cases where a pipe didn't last one year. This is of course bad, but if the same corrosion happens in machines or process units, big problems arise. Bringing down the corrosion rate not seldom 10 times less than before, is increasing the lifetime of the installed equipment in accordance.
The savings in replacements accumulate easy to Millions of Dollars a year.
Additional if there are no shut downs of the production, due to malfunctions of the equipment the whole operations are smoother and production can go on undisturbed.

 

 

offshore platform drilling rig

Further images (click to enlarge)

[Previous page]

 

OG_2.3°Fouling