The pressure factor is not a constant for given natural water drive reservoir.

压力系数对于任何具体的天然水驱油(气)藏不是一个常数。

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For flooding development reservoir, addressed the classing method for natural driving energy and the evaluating method for natural water drive development effect.

对水驱开发油藏论述了天然驱动能量的分级方法与天然水驱开采效果的评价方法。

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Well hua 49 area in Huachi oil field, Xuanma area, well 63 area, well 55 area in Chenghua region in Shan-gan-ning basin are now produced under natural water drive.

陕甘宁盆地城华地区的华池油田华49井区、城壕油田玄马区、城63井区与城55井区目前均采用自然能量开采。

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You are now driving(in effect) on free solar energy that you created by removing the need to heat water and using the natural gas to drive your car instead.

FORBES: Gassing Up: Why America's Future Job Growth Lies In Traditional Energy Industries