Well Processing - SWIT Application

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SUBSEA WATER INJECTION AND TREATMENT Injecting seawater into reservoirs is the most commonly used technology for pressure maintenance and Increased Oil Recovery (IOR), and is a long established practice. Water treatment before injection is essential to achieve long term protection of the reservoir. Offshore, water treatment processes and high pressure pumps are traditionally located on platform topsides as no other solutions have previously been available. The treated seawater is injected into the main field reservoir through platform-based injection wells, or can be transported out to subsea injection wells through long flowlines. The increased oil recovery achieved by topsides injection comes at a price i.e.: large, heavy treatment plants that are costly and operator intensive to run. The plant itself can restrict the amount of seawater available, and the number of well slots made available for seawater injection will affect the field drainage strategy and efficiency. Another practical or economical restriction will often also be limited reach from the platform A logical alternative to lifting water topsides, filtering, chemically treating, deaerating, boosting and injecting is to do it all on the seabed – e.g. at the subsea injection wellhead. Our SWIT (Subsea Water Injection and Treatment) technology enables such a subsea solution. A 4-slot template based SWIT system, containing a treatment module, injection pump and well control equipment (X-tree), is illustrated below. A power cable only tie back (e.g. to a host FPSO) is required. SWIT is an attractive option to traditional solutions and enables you to move water treatment and injection to the seabed. Thereby if offers the opportunity to inject as much high quality water as is required to the locations in the reservoir where it will have the optimal IOR effects. This gives the reservoir engineers complete flexibility in designing the optimum water drive. A single ‘power cable only’ interface makes an easy ‘add-on’ for both topsides and subsea fields at any stage of field life.
Well Processing AS, Skogstostraen 25, N-4029 Stavanger, Norway; Phone:+47 51 20 16 40, Fax :+47 51 20 16 60

SUBSEA WATER INJECTION AND TREATMENT
Injecting seawater into reservoirs is the most commonly used technology for pressure maintenance and Increased Oil Recovery (IOR), and is a long established practice. Water treatment before injection is essential to achieve long term protection of the reservoir.

Offshore, water treatment processes and high pressure pumps are traditionally located on platform topsides as no other solutions have previously been available. The treated seawater is injected into the main field reservoir through platform-based injection wells, or can be transported out to subsea injection wells through long flowlines. The increased oil recovery achieved by topsides injection comes at a price i.e.: large, heavy treatment plants that are costly and operator intensive to run. The plant itself can restrict the amount of seawater available, and the number of well slots made available for seawater injection will affect the field drainage strategy and efficiency. Another practical or economical restriction will often also be limited reach from the platform

A logical alternative to lifting water topsides, filtering, chemically treating, deaerating, boosting and injecting is to do it all on the seabed – e.g. at the subsea injection wellhead. Our SWIT (Subsea Water Injection and Treatment) technology enables such a subsea solution.

A 4-slot template based SWIT system, containing a treatment module, injection pump and well control equipment (X-tree), is illustrated below. A power cable only tie back (e.g. to a host FPSO) is required.

SWIT is an attractive option to traditional solutions and enables you to move water treatment and injection to the seabed. Thereby if offers the opportunity to inject as much high quality water as is required to the locations in the reservoir where it will have the optimal IOR effects. This gives the reservoir engineers complete flexibility in designing the optimum water drive.

A single ‘power cable only’ interface makes an easy ‘add-on’ for both topsides and subsea fields at any stage of field life.

Well Processing AS, Skogstostraen 25, N-4029 Stavanger, Norway; Phone:+47 51 20 16 40, Fax :+47 51 20 16 60