某压裂火药燃烧速度特征与温度关系的密闭爆发器实验研究

为模拟某压裂火药在油井作业中燃气的压力变化规律,需要确定火药的燃烧速度与其温度的关系。利用密闭爆发器实验系统,获得不同温度条件下火药燃气的压力随时间的变化曲线。基于内弹道火药燃烧特征量静态分析方法,计算出不同温度下火药的燃烧速度定律,并进一步计算燃速系数与温度的关系。通过拟合得出火药的燃速随温度增长的指数式变化函数,通过误差分析判定该函数适用于30 ℃～150 ℃的温度变化区间,为不同温度下的井下模拟计算提供了理论支持。

Experimental Research on the Relationship Between Burning RateCharacteristics of a Fracturing Gunpowder and Temperatureby Closed Bomb Test

According to the combustion theory of gunpowder,the burning rate changes with temperature. In order to simulate the pressure change law of gas in a well operation,it is necessary to determine the relationship between the burning rate of the gunpowder and its temperature. The experimental system of closed bomb was used to obtain the curve of gunpowder-gas pressure varying with time under different temperature conditions. Based on the static analysis method of internal ballistic gunpowder combustion characteristic quantity,the law of burning rate of gunpowder at different temperatures was calculated,and the relationship between burning rate coefficient and temperature was further obtained. The exponential change function of the burning rate of gunpowder with temperature was obtained through fitting. The error analysis determines that the function is suitable for the temperature change range of 30 ℃-150 ℃,which provides theoretical support for downhole simulation calculation about downhole at different temperatures.