RE: STENA NATALITA21 Aug 2019 19:29
'.. in the worst case production scenario, where the levels of production are predicted to drop off within the life of the EPS development, produced water may be seen at the surface. This could happen if water was to break into the oil reservoir, which is very unlikely. ...It should be borne in mind that even under worst case predictions, produced water is only anticipated to appear in year 4 of the up to six year development and then decline again.' YEAR 4!
...'An application to discharge oil must describe the nature and quantity of the oil source, as well as details of any processes designed to reduce oil content of the discharge and methods for the monitoring and analysis. It must also provide a discussion of the potential options for treatment and discharge of the oil, justifying the selected route as the best available option.'
...'if it is encountered, the produced water will be processed to reduce the oil content and discharged to sea, with prior approval under the OPPC Regulations. Further details on potential oily discharges are provided in the respective sections of the project description (Section 3) and relevant impact section (Section 9).' has OPPC approval been granted?
Section 3: 'All produced water discharges will be treated to a maximum oil concentration of 30 mg/l on average.' ..'Prior to discharge to sea, the oil-in-water content of the produced water will be determined by an integrated analyser located at the outlet from the water coolers. The analyser has a divert system so, if the dispersed oil concentration exceeds 30 mg/l, produced water will be diverted to the vessels slops tanks.' ...'if the quantity of water of produced is particularly low. Discharges from the slops tank will be treated to attain an oil in water content of 15 ppm, in line with the relevant Merchant Shipping regulations, and the concentration and volume will also be monitored.'
Section 9 '..onshore treatment and disposal will be retained as an option in this case, for example, issues are encountered with offshore processing equipment (Section 9.6.4), the discharge of processed produced water to sea was considered to be the more viable option, both technically and economically.' option provided for worst case!
PLOT THICKENS!
' The new FPSO serving these BP operated fields, the Glen Lyon, has been designed to handle significant quantities of produced water. During the development planning stages, produced water was expected to increase steadily over the first 10 years of production to 45,000 m3 per day, and then remain at that level for a further 10 years (BP, 2010). However, the significant quantities of produced water expected prompted the design of a re-injection system, utilising water injection wells already in place. By being able to re-inject produced water from the outset of production, any required produced water discharges to sea will be intermittent and only associated with downtime in the system.'