Water injection is used to increase pressure, therefore stimulate the production and increase the oil recovery. Normally only 30% of the oil in a reservoir can be extracted, but water injection increases that percentage to 51%. You can find water injection wells on both on- and offshore.
Sea water is the most convenient source for offshore production facilities and may be pumped onshore and used on land based production facilities. Where possible the water intake is positioned at sufficient depth to reduce the concentration of algae; however filtering, deoxygenation and biociding is generally required.
River water will always require filtering and biocide treatment before injection.
Aquifer water from water-bearing formations other than the oil reservoir, but in the same structure, has the advantage of purity where available.
Produced water is often used as an injection fluid. This reduces the potential of causing formation damage due to incompatible fluids, although the risk of scaling or corrosion in injection flowlines or tubing remains.
The importance of proper water treatment before water injection is often underestimated by oil companies and engineering companies. Especially with river-, and seawater, intake water quality can vary tremendously (algea blooming in spring time, storms and current stirring up sediments from the seafloor). This will have significant impact on the performance of the water treatment facilities. If not addressed correctly, water injection may not be successful. This results in poor water quality, clogging of the reservoir and loss of oil production.
Twin Filter offers permanent installations and temporary systems for onshore and offshore applications and FPSO's.
Scope of supply:
Pre treatment
• desander cyclones
• automatic self cleaning filters, TwinOmatic
Polishing
• multi-media filters
• cartridge filters
• high pressure wellhead guard filters
Contact us to learn more.