Water injection


Water Injection

Water injection for Wells and Disposal water lines are often used with Carbon Steel with Internal Cement mortar.

These lines are normally working under higher pressure. Conpipe has supplied to several projects with pressures up to 200 Bar.

Effective corrosion protection for oil pipelines is the subject of intensive research around the globe, given the high aggressiveness of the media transported.

The need for a dependable solution is becoming even more urgent as recovery methods switch from primary to secondary. In primary production, the oil is brought up by the natural pressure in the reservoir. However, this pressure – and hence the production rate – decreases with time. In secondary oil recovery, water is injected into the reservoir to keep up the pressure and increase the recovery rate. Thus, besides oil gathering lines operated at a relatively low pressure of up to about 40 bar, secondary oil recovery requires injection pipes, which have to resist service pressures of up to 200 bar in order to build up the necessary pressure in the reservoir.

Compared to primary recovery, the media transported in secondary recovery vary significantly in terms of their chemical composition and properties. The chemical analysis of oil/water mixes encountered in secondary recovery shows high mineral levels as well as the presence of solids and dissolved gases, such as H2S or CO2 . Media with this kind of composition call for a chemically resistant pipe lining that prevents the penetration of corrosive constituents to the steel surface. In addition, with a view to the solids contents, the lining must be resistant to abrasion. These requirements also apply to the joint areas in a pipe string.

We advise to use following systems:

  • cement-lined carbon steel piping