注空气采油过程中油田伴生气临界氧体积分数试验研究  

Experimental test for the limiting oxygen volume fraction of the oilfield gas in the air injection process for oil recovery

作　　者：张成博 李鹏亮 栾睿智 程涛 扈福堂[3] ZHANG Cheng-bo;LI Peng-liang;LUAN Rui-zhi;CHENG Tao;HU Fu-tang(Liaohe Oilfield Branch Drilling Technology Research Institute,China National Petroleum Co.,Ltd.,Panjin 124010,Liaoning,China;State Key Laboratory of Explosion Science andTechnology,Beijing Institute of Technology,Beijing 100081,China;Qinghai Oilfield Branch Drilling Technology Research Institute,China National Petroleum Co.,Ltd.,Dunhuang 736200,Gansu,China)

机构地区：[1]中国石油天然气股份有限公司辽河油田分公司钻采工艺研究院,辽宁盘锦124010 [2]北京理工大学爆炸科学与技术国家重点实验室,北京100081 [3]中国石油天然气股份有限公司青海油田分公司钻采工艺研究院,甘肃敦煌736200

出　　处：《安全与环境学报》2020年第6期2097-2102,共6页Journal of Safety and Environment

摘　　要：在注空气采油过程中,井筒内油田伴生气的存在可能导致油井发生爆炸事故。避免此类事故发生的最有效方法是控制注气作业过程中的氧体积分数,因此需要对井筒高温高压条件下可燃气体的临界氧体积分数进行研究。本文通过理论分析和试验测试对油田伴生气的临界氧体积分数进行了研究,初始温度为40℃和80℃,初始压力为1~15 MPa。结果表明,相较于温度,压力对临界氧体积分数的影响更为显著,临界氧体积分数随初始压力的升高而降低,且压力的影响逐渐减弱;依据试验结果提出了临界氧体积分数的经验计算公式;结合现场工艺提出了相关监控指标和方法,为注空气采油过程的安全防护提供了一定的技术依据。The present paper has managed to establish an experimental system for testing the limiting oxygen volume fraction of the combustible gas at high temperature and high pressure so as to get rid of the well-borne explosion in the air injection process.As is well known,a great need has existed to investigate the limiting oxygen volume fraction of the combustible gas at high temperatures and pressures.To achieve the purpose,we have managed to carry out the experiments as well as theoretical analysis on how to restrict the oxygen volume fraction of combustible gas to get rid of the likely wellborn explosion.Theoretically,it is known that the limiting oxygen volume fraction of the combustible gas is about 12.96%at the normal pressure and the atmospheric temperature,whereas the initial temperatures should be set as 40℃and 80℃,with the initial pressures chosen from 1 MPa to 15 MPa.And,though the results of the above 2 theoretical methods are quite different,yet,on the whole,the results of the diagram method can be regarded as closer to the objective reality.And,so,the experimental results prove that both the temperature and the pressure can have a certain impact on the limiting oxygen volume fraction of the combustible gas.And,with the increase of the initial temperature and pressure,the limiting oxygen volume fraction tends to decrease.What is more,the initial pressure may have an obvious effect,though its effect on the temperature is indeed insignificant.Besides,the influence of the pressure on the limiting oxygen volume fraction may gradually decrease as the initial pressure goes up.Hence,on the basis of the experimental results,a model for calculating the limiting oxygen volume fraction has to be proposed,so as for the said limiting oxygen volume fraction to be dependable on the initial pressure exponentially.Thus,in combination with the experimental results and the practical technology,it would be possible to put forward a monitoring index and a method of oxygen volume fraction control in the wellbore accordingly

关 键 词：安全工程 注空气采油 高温高压 临界氧体积分数 

分 类 号：X932[环境科学与工程—安全科学]