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Practically speaking only what is needed for a drilling rig to fit in. Legally speaking, it depends on several factors as determined by the regulating authority which bases its requirements on engineering formulas designed to calculate how much of the surrounding subsurface area will be effectively drained by the well bore. The determining factors used in the calculations are the depth, porosity, psi, whether it is primarily an oil well or a gas well.

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14y ago

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