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Primitive conditions, reservoir rocks and fluids inside the pore space in the pressure equilibrium, once the oil drilling, this balance was destroyed. At this time, due to pressure caused by reduced elasticity of the rock and fluid expansion, and its corresponding volume of oil was driven to the wells. If the formation pressure is sufficient, that would give rise to the wellhead of crude oil over the formation of oil from the spray.

The original conditions, the oil reservoir rock and pore space in the fluid within the pressure balance state, once the open, this balance oil drilling will be destroyed. At this time, because the pressure caused by lower rock and fluid flexibility expansion, the corresponding volume of crude to the well was flooding. If formation pressure, if he can be enough oil to the above, lifting the spray forming production.