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However, this is not always the case, especially in depleted fields where the pressures have been lowered by other producing wells, or in low permeability oil reservoirs. Some sources claim that from the 9th century, oil fields were exploited in the area around modern Baku , Azerbaijan , to produce naphtha for the petroleum industry. In the 20th century, cable tools were largely replaced with rotary drilling , which could drill boreholes to much greater depths and in less time. Categories : Oil wells American inventions Azerbaijani inventions Chinese inventions Drilling technology Polish inventions Russian inventions. The cost of a well depends mainly on the daily rate of the drilling rig, the extra services required to drill the well, the duration of the well program including downtime and weather time , and the remoteness of the location logistic supply costs. These places were described by Marco Polo in the 13th century, who described the output of those oil wells as hundreds of shiploads. Studies in Early Petroleum History.

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