The coning of bottom water will happen as soon as the producing pressure drop of a well is higher than the difference of gravity caused by the difference of density between oil and water.
当油井生产形成压力降落大于油水密度差引起的重力差时，砂岩底水油藏锥进即会发生。
2
The bilayer well completion-water drainage-oil production technology can inhibit the bottom-water coning to tap the productive potential of the reservoir and improve the development result of it.
双层完井排水采油技术可以抑制底水锥进，达到解放油层生产潜力、改善油藏开发效果的目的。
3
Coning can also occur by drawing down the gas-oil contact around a well.