Notional Field Development Final Report - EBN

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EBN Notional Field Development Plan Figure 4-58. Metering station One important function that can be performed at the metering station is the activation of the shut-off valve in the case of operational issues or safety concerns. These metering stations are linked into a SCADA (supervisory control and data acquisition) system which consists of a series of instrumentation that transmits data into a computer system to monitor and control the facility. The station can be monitored by on-site personnel or remotely from a centralized control room at an off-site location. 4.6.6 Produced Water Tanks One of the bi-products / waste generated within a processing facility is produced water. Within the midstream sector this is a broad term that includes actual formation water that is absorbed into the gas molecules, condensates and other residuals that are processed out of the gas stream. This produced water is routed over to tanks for storage and eventual disposal. These produced water tanks are also commonly referred to as “slop water” tanks because of the variety of liquid waste streams that are often deposited into them. Depending upon the waste / water volumes anticipated, there are typically several (1 – 4) tanks linked together and referred to as a tank battery. The tanks are made of steel or fiberglass and can range in size but a typical volume would be 400 to 500 gallons (each tank). The tank battery is built with a secondary containment system to control spillage and a series of valves to facilitate their draw-down for disposal. © 2011 Halliburton All Rights Reserved 210
EBN Notional Field Development Plan The facility would contract with a waste hauler to transport this water / waste to an off-site approved disposal site (treatment plant or disposal well). The volumes of water collected would determine the frequency with which the waste hauler would schedule a pick-up at the site. Figure 4-59. Produced water tanks with secondary containment 4.6.7 Gas Pipelines (Mainlines) Mainline transmission pipelines are the means by which the gas is shipped from the processing facility to their markets. The pipelines are usually between 16 and 48 inches in diameter and made from a strong carbon steel material, engineered to meet industry standards. These pipes are coated with a fusion bond epoxy to protect the pipe from moisture, which causes corrosion and rusting. In addition, cathodic protection is installed as a secondary method of protecting against corrosion and rusting. 4.6.7.1 Compressor Stations The gas is shipped through the pipeline at high pressures. To ensure gas remains pressurized, compression of the gas along the pipeline is required and compressor stations are constructed at intervals usually between 40 and 100 miles. There are different types of compressors used to compress the gas. © 2011 Halliburton All Rights Reserved 211
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