由于人或技术的差错,油井往往出现故障,加之地下的强大压力,使天然气和石油涌到地面上来,形成天然气和石油外溢。此外,地下岩层本身的重量构成油井内外力量均衡,这在流体力学上称之为作用力和反作用力相同。如果钻井时钻到畸形岩层,就使怍用力和反作用力失去平衡,这时天然气和石油就会发生外溢。溢出的天然气和石油极易着火。为了防止这类危险事故发生,一般在油井中安装安全设 Due to human or technical errors, wells often fail, coupled with strong underground pressure, so that natural gas and oil to the ground up, the formation of natural gas and oil spills. In addition, the weight of the subterranean formation itself constitutes a balance of forces inside and outside the well, which is called the same hydrodynamic force and reactionary force. If drilling a deformed rock, drilling and balancing forces are out of balance, when natural gas and oil spills. Spilled gas and oil can easily catch fire. In order to prevent such dangerous accidents, safety wells are generally installed in the oil well