System Description
Sea Water Injection systems maintain pressure in the reservoir
to insure increased hydro-carbons recovery. Pumping treated
and conditioned seawater into injection wells is an effective
and efficient process which insures economic hydrocarbon
recovery for many years after the natural drive system of the
formation is for efficient process which insures economic
hydrocarbon recovery for many years after the natural drive
system of the formation is depleted.

Platform lift pumps supply affluent seawater to the system @
±100 psig, with a side stream going to an electrochlorinator,
where hypochlorite solution is generated and reinjected into the
main stream to combat biological fouling, preventing settlement
and growth of marine organisms. Coarse strainers remove
particulate ≥80-100µ in size. This prevents overloading the fine
fine filters located downstream of the coarse strainer.  

The water then flows to the fine media filters which remove
suspended particulate ≥2-5µ.Obtaining removal to ≥2µ
particulate in the effluent requires the use of filter aids, whereas
a 5µ. effluent process guarantee can be obtained without the a
use of filter aids. specification for injected solids, and insures
particulate in the effluent requires the use of filter aids, whereas
a 5µ. effluent process guarantee can be obtained without the
use of filter aids. specification for injected solids, and insures
that minimal The ≥2-formation blockage occurs.

 
Strainers  & Filters:

Coarse strainers are equipped with wedge wire internals, which can be
cleaned, backwashed ei-ther manually or automatically.

Fine particulate filtration is done using either sand, walnut shells or dual
media filtration. Dual media has been the standard using anthracite and
garnet. However, as weight becomes more & more of a factor, walnut shell
filtration should be  considered offshore.

Guard filters are usually cartridge filters. These are used to protect pumps
and the formation from oversized particulate which may have come
through the system.

Deaeration:

Can be accomplished in a packed tower using a stripping gas only, if gas
is available. This is the most economical method of deaeration.

Can be accomplished in a packed tower using a vacuum system to pull a
vacuum on the tower, thereby causing the water to flash, with the water
vapor acting as the scrubbing gas. This is the second most economical
method of deaeration.

Can be accomplished using chemical means by the use of catalyst
working in conjunction with either nitrogen or hydro-gen, which is used for
the catalytic regen-eration. These gasses must be gener-ated. The
catalysts are expensive, need replacement, and these systems have not
been used for large flow rates as yet. These systems also require other
auxil-iary equipment, which makes them maintenance intensive. This is the
most ex-pensive method of deaeration.
most ex-pensive method of deaeration.
been used for large flow rates as yet. These systems also require other
auxil-iary equipment, which makes them maintenance intensive. This is the
most ex-pensive method of deaeration.

Pumping Required:

  Seawater lift pumps;
·        Booster pumps;
·        Injection pumps;

Chemicals Injection Systems:

The  following chemicals are used in the Sea-water Injection System,
Biocide, polyelectrolyte, coagulant, antifoam, O2 scavenger, scale and
corrosion inhibitor, filter aid. The system includes a single corrosion
compartmented tank, skid mounted, with all chemical pumps, piping and
controls to make it self contained.

Optimise the filtration and deaeration process;

Prevent corrosion in the pipework;

Reduces scale formation in the reservoir; mini-mises biological activity in
the well (e.g. SRB's);


Sea Water Injection System
Strainers, Media Filters, Deaeration and Chemical Systems


“SELLING WATER TREATMENT EQUIPMENT TO THE WORLD”


Fluid Technologies