大长径比油气管道空间爆炸事故分析--以中国石油新疆油田分公司“8·7”稠油热采井口爆炸事故为例

Gas-oil mixture explosion analysis in case of long large-diameter pipes——A case study withXinjiang Oilfield,PetroChina

为分析大长径比管道内气体爆炸事故的原因,以新疆克拉玛依油田克浅10井区"8·7"23123井口爆炸事故为例,进行物理爆炸和化学爆炸的理论计算,并分析井口爆炸事故过程。物理爆炸计算与分析表明,爆炸可产生的压力为18.46MPa,小于采油(气)井口装置105MPa的爆破压力,因此,该爆炸不属于蒸汽过热引起的物理爆炸。化学爆炸计算表明,油管内发生化学爆炸产生的高温达到2666.7℃,可以使钢材强度受到破坏;化学爆炸的爆轰压力为122.4MPa,大于井口装置能承受的爆破压力,说明是化学爆炸产生的爆轰压力摧毁了井口装置。计算与分析的结果可以为防止类似事故的发生提供参考。

The paper is by nature a case study over the ＂8·7＂ accident that took place in Xinjiang Oil field, in which we have investigated and analyzed the causes of the confined gas-oil explosion of the long large-diameter pipe, First of all, our analysis intends to disclose the true cause and effect that is likely to lead to the disastrous accident from the theoretical depth of explosive physics and chemistry, as well as the explosion history. The explosive physics analysis and calculation indicate that the explosive physics pressure the pipe had to subject is 18.46 MPa, which is less than the demolishing pressure （105 MPa） of the well mouth setting and Christmas tree, but the chemical calculation results show that the exploding temperature should be 2 666.7 ℃, which suggests high enough to overcome the steel strength. The detonation overpressure is worked out at 122.4 MPa, which exceeds the demolishing pressure. From the above data of our investigation and analysis, it can be concluded that the well setting was destroyed by the chemical explosion. The investigation results thus contribute to disclose the true causes＇of the explosion and therefore are valuable to enhance the likely to-be-taken actions to avoid such disastrous accidents.