多孔喷嘴能量转化效率分析

发布时间：2018-07-14 16:20

【摘要】：多孔喷嘴是径向水平井技术的核心技术装备,需同时实现高效破岩与强力自进,而目前常用的多孔喷嘴的流量系数一般在0.6左右,其能量转换效率仅为36%左右,严重限制了多孔喷嘴的整体性能。因此,研究多孔喷嘴流量系数影响规律十分必要。根据流量系数定义推导了多孔喷嘴流量系数,试验确定了各孔眼局部阻力系数,并研究了排量、孔眼数量对多孔喷嘴流量系数影响规律。结果表明,多孔喷嘴能量转化效率等于其流量系数的平方;其流量系数由各孔眼流量系数与其权重决定;孔眼流量系数主要取决于其沿程阻力系数与局部阻力系数;绝大部分能量损失由局部阻力损失引起;而孔眼局部阻力系数随着排量增加略有降低,但随着孔眼数目增加而迅速增大。
[Abstract]:The porous nozzle is the core technology equipment of radial horizontal well technology, which needs to realize high efficiency rock breaking and strong self-advancing simultaneously. However, the flow coefficient of the commonly used nozzle is generally about 0.6, and its energy conversion efficiency is only about 36%. This severely limits the overall performance of the porous nozzle. Therefore, it is necessary to study the influence law of flow coefficient of porous nozzle. According to the definition of flow coefficient, the flow coefficient of porous nozzle is deduced, the local resistance coefficient of each hole is determined by experiments, and the influence of displacement and the number of holes on the flow coefficient of porous nozzle is studied. The results show that the energy conversion efficiency of the porous nozzle is equal to the square of its flow coefficient, the flow coefficient is determined by the flow coefficient of each hole and its weight, and the flow coefficient of the hole is mainly determined by the coefficient of resistance along the path and the coefficient of local resistance. Most of the energy loss is caused by local resistance, but the local resistance coefficient decreases slightly with the increase of displacement, but increases rapidly with the increase of the number of holes.
【作者单位】：中国石油大学(北京)油气资源与探测国家重点实验室;
【基金】：国家863计划项目(2015AA043401) 国家科技重大专项(2011ZX05036002) 中国石油大学(北京)科学基金项目(2462013BJRC002)
【分类号】：TE921

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