The injection of water is often necessary to maintain reservoir pressure and increase the recovery factor in oil production, but the importance of effective water treatment is often underestimated. Water intake quality can vary tremendously due to algae and plankton blooms, silts and other sediments and this will have significant impact on the performance of the water treatment facilities. If not addressed correctly, the injected water may be of poor quality resulting in clogging of the reservoir and loss of oil production. Amazon supplies filters designed to be used throughout the water treatment process to help ensure it functions to optimum levels. Whether the application is fixed or floating, seawater or freshwater Amazon Filters is able to provide easy operating, cost effective solutions to help maximise the production of water for injection.Coarse Filtration
Coarse filtration is an important step to ensure the critical treatment systems downstream function effectively. The role of coarse filtration is to remove the bulk contaminants such as sand, silt, seashell fragments etc. Amazon Filters can provide filtration systems containing wedge wire screens or candles designed to provide automated operation and backwashing. The filters are typically rated between 25 and 100 µm. These systems provide an economical method of removing bulk contaminants and offer excellent protection for the guard/fine filtration systems that follow downstream.
Removal of fine particulates from water to be injected is important to avoid plugging of the reservoir and hindering oil recovery. Typically situated downstream of the Coarse Strainers or deep bed Multi Media Filters (MMF), the fine ‘Guard’ filters are used to remove particles ranging from 1 to 50 µm. Protecting either the well or other water treatment processes, these filters should offer absolute retention of particulate contaminants.
Typical applications would include the protection of Sulphate Removal Processes (SRP) used on water for injection to prevent scaling of the formation caused by sulphates reacting with barium and strontium in the crude oil. Removal of the sulphates will also reduce the risk of reservoir souring. It is critical that nano-membranes used in the SRP are protected by effective prefiltration to ensure optimum operation of the system.
Amazon Filters Limited has developed two ranges of absolute rated cartridges specifically to protect the critical membranes used in the water treatment and Sulphate Removal Processes. SupaSpun II SRP cartridges and the large diameter, high surface area SupaPleat HFC SRP filter have been designed to be absolute rated as, unlike low technology nominal filters, they maintain removal efficiency for contaminants throughout the life of the filter and under varying process conditions. It is typical for nominal filters to suffer reduced removal efficiency or to unload previously retained contaminants after a period of use. Therefore the use of SupaSpun II SRP and SupaPleat HFC SRP filters can maximise membrane life, reduce replacement costs and avoid unexpected interruptions to the process.
Sea Water Reverse Osmosis (SWRO) Protection
Reverse Osmosis is typically used to produce potable water and the high purity water used in potable water makers. RO membranes require fine prefiltration to ensure long life and typically Amazon Filters supplies SupaSpun II and SupaPleat II rated at 5-10 µm absolute for this application. These are available as either standard cartridges or in the large diameter, high flow format. Where required we are able to offer SupaGard depth filters for this application. Amazon is also able to offer a new filtration system for the filtration of brackish and seawater consisting of a 20”, 40” or 60” length 27 Series GRP (Glass Reinforced Plastic) housing and a large diameter, high surface area SupaPleat FFC cartridge.
Contaminated produced water requires significant processing to allow reuse or disposal. This is a multi-step process and typically the system contains bulk oil separators, cyclones, degassers and polishing filtration. Amazon Filters supplies high efficiency polishing filters to help ensure the solids levels are reduced to the desired level. We are able to offer a range of absolute and nominal rated filters for this application, including SupaPleat II, SupaSpun II and SupaGard cartridges and DuoLine bag filters. This enables the supply of the optimum solution that exhibits both long life and reliable retention of solids.
Amazon also supplies SupaSorb cartridges for removal of hydrocarbons from water. Typically used as polishing units downstream of primary removal equipment, they offer up to 99% removal of oil and emulsions where contamination levels are up to 500mg/l.