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Unconventional Wells - New Techniques and Processes
Although there is no statutory definition of Unconventional Wells for 'tight oil and gas' extraction, these have been described as wells which:
are drilled vertically then sloped horizontally into reservoirs into permeable formations limestone, chalk and sandstone allowing oil or gas to flow using acid stimulation techniques.
use less than 10,000 cubic metres (2.2 million gallons) of fresh water in the whole drilling process.
are sometimes hydraulically fracked to assist in increased flow of fuels to the surface (But are not classified by the government as FRACKING because they use less than 10,000 cubic metres of fluid)
can be drilled from the surface of any appropriate region regardless of its status as an area of environmental protection, natural beauty, water protection zone or heritage site
can be excavated in multiple directions horizontally from each well pad covering one hectare or more on permitted sites, extending under other properties and land without other landowner permissions.
are difficult to maintain high yields of flow over long periods and deemed therefore as uneconomical. Therefore they are abandoned and decommissioned and new wells are drilled from the same well pad. Up to 10 per well pad are possible.
Above :Wytch Farm Main oil site and collection station: Dorset
Left: Horse Hill: Oil Exploratory Site, West Sussex