高温射流反应腔结构设计与反应规律

发布时间：2018-01-29 02:15

  本文关键词： 高温射流 非预混燃烧 燃烧装置 反应规律 数值模拟　出处：《石油学报》2017年05期 　论文类型：期刊论文

【摘要】：结合高压水射流和岩石热裂解钻井方法,提出了适用于深部硬地层的高温射流钻井新方法,即利用高速射流对岩石表面形成冲击力,同时高温流体迅速将热量传递给岩石以达到快速破岩的目的。因此高温射流发生装置对最终作用于岩石的射流性能十分重要,设计了两种高温射流燃烧反应发生装置结构(混合装置和对冲装置),利用计算流体力学模拟了常压下不同反应参数对生成的高温射流的影响,并对两种装置进行对比分析和反应规律研究。结果表明:高温的平均射流速度随着甲醇质量流量的增加而增大;气体存在滑脱效应,在满足化学反应方程的理论值的基础上,甲醇的实际质量流量应大于理论质量流量,而氧气的实际质量流量小于理论质量流量,使两者混合和燃烧更加充分,释放更多能量;在本文模型条件下,将空气质量流量控制在0.03~0.04kg/s较为合适,既可以保证反应腔内充分燃烧,又可以获得较高的射流速度;冷水质量流量与喷嘴速度呈线性正相关;在现场实际应用中,应注意控制冷水流量,以免造成射流温度过低。不同空气质量流量条件下,混合装置的射流速度和温度较优。两种装置的射流速度和温度在不同氧气浓度条件下变化规律一致,均先增大、后减小,但是在射流速度方面,对冲装置较优。在现场实际应用时可根据需要达到的射流速度和温度选择不同结构的燃烧装置,使高温射流的性能达到最优。
[Abstract]:Combined with high pressure water jet and rock pyrolysis drilling method, a new high temperature jet drilling method suitable for deep hard formation is put forward, that is, using high speed jet to form impact force on rock surface. At the same time, the high temperature fluid can transfer the heat to the rock quickly to achieve the purpose of breaking the rock quickly. Therefore, the high temperature jet generator is very important to the performance of the jet acting on the rock. Two kinds of high temperature jet combustion reaction generator structures (mixing device and counter device) are designed. The influence of different reaction parameters on the generated high temperature jet under atmospheric pressure is simulated by computational fluid dynamics. The results show that the average jet velocity at high temperature increases with the increase of methanol mass flow rate. On the basis of satisfying the theoretical value of the chemical reaction equation, the actual mass flow rate of methanol should be larger than the theoretical mass flow rate, while the actual mass flow rate of oxygen is smaller than the theoretical mass flow rate. Make the two mixing and burning more fully, release more energy; Under the condition of this model, it is more suitable to control the air mass flow rate at 0.03 ~ 0.04kg / s, which can not only ensure the full combustion in the reaction chamber, but also obtain higher jet velocity. There is a linear positive correlation between the mass flow rate of cold water and the velocity of nozzle. In practical application, it is necessary to control the flow of cold water in order to avoid the jet temperature being too low and under different air mass flow conditions. The jet velocity and temperature of the two devices are the same under different oxygen concentration conditions, both increase first, then decrease, but in the jet velocity. The combustion device with different structures can be selected according to the velocity and temperature of the jet in practical application in the field, so that the performance of the high temperature jet can be optimized.
【作者单位】： 中国石油大学油气资源与探测国家重点实验室;中国石油集团钻井工程技术研究院;
【基金】：国家自然科学基金项目(No.51504272,U1562212) 教育部优秀博士论文作者专项基金项目(201352) 中国石油天然气集团公司钻井新技术新方法(2016A-3902);中国石油天然气集团公司创新基金项目(2015D-5006-0308) 中英研究与创新桥计划合作项目“地热智能井钻完井关键技术与优化设计平台”(2016YFE0124600)资助
【分类号】：TE21
【正文快照】： 引用:宋先知,吕泽昊,崔柳,李根生,刘昱,胡晓东,纪国栋.高温射流反应腔结构设计与反应规律[J].石油学报,2017,38(5):587-596.Cite:SONG Xianzhi,L媲Zehao,CUI Liu,LI Gensheng,LIU Yu,HU Xiaodong,JI Guodong.Structure design and reaction law ofhigh-temperature jet reacti

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