Numerical Simulation on Subcooled Boiling Heat Transfer Characteristics of Water-Cooled W/Cu Divertors

In order to realize safe and stable operation of a water-cooled W/Cu divertor under high heating condition,the exact knowledge of its subcooled boiling heat transfer characteristics under different design parameters is crucial.In this paper,subcooled boiling heat transfer in a water-cooled W/Cu divertor was numerically investigated based on computational fluid dynamic(CFD).The boiling heat transfer was simulated based on the Euler homogeneous phase model,and local differences of liquid physical properties were considered under one-sided high heating conditions.The calculated wall temperature was in good agreement with experimental results,with the maximum error of 5%only.On this basis,the void fraction distribution,flow field and heat transfer coefficient(HTC)distribution were obtained.The effects of heat flux,inlet velocity and inlet temperature on temperature distribution and pressure drop of a water-cooled W/Cu divertor were also investigated.These results provide a valuable reference for the thermal-hydraulic design of a water-cooled W/Cu divertor.     

高产深井双电潜泵分层开采完井工艺

本文重点分析关于油井分层高效化开采井筒升举过程中所使用的工艺以及可能会出现的问题,对双电泵完井方式的特点进行详细的分析。通过双电泵完井方式进行作业可以分别利用过电缆封隔器和插入式丢手封隔器来实现,通过对单油管和双油管两种不同的管柱结构在何种条件下可以更好的进行使用展开讨论,利用同心油管是否可以更好的补足以上两种不同结构的油管所带来的不便,本文详细以此来详细的分析双电泵分层完井具体施工的过程中注意的一些问题。     

准噶尔盆地吉木萨尔凹陷芦草沟组页岩油上甜点地质工程一体化开发实践

准噶尔盆地吉木萨尔凹陷芦草沟组(P2l)页岩油资源富集、开发潜力巨大。自首口水平井吉172_H井获得产量突破以来,围绕页岩油规模效益开发的目标,对10口水平井开展体积压裂技术攻关试验,但生产效果均未达预期。通过地质工程一体化联合,在确定P2l22-2岩屑长石粉细砂岩层为优质甜点目标、明确优质甜点钻遇率是压后高产地质保障的基础上,分析了层理面和高强度泥岩隔层对人工裂缝纵向延伸能力的限制作用,对比了已实施水平井的压裂改造参数差异,提出了水平井密切割、高强度体积改造的提产提效技术对策。2017年部署的开发试验井创造了最高日产108.3t、投产240天累计产油过万吨的新生产纪录;2018年推广试验水平井10口,投产5个月平均日产油量达到30.4t,充分证明水平井密切割、高强度体积改造可以有效提高单井产量,取得较高的开发效益,为吉木萨尔凹陷页岩油的规模开发奠定了扎实的技术基础,提供了有力的工程支撑。     

青海滩间山金矿选矿工艺改造及生产实践

针对青海滩间山金矿矿石泥化严重，“全泥氰化+浮选”联合工艺指标不理想问题，进行了实验室优化试验研究，并进行了生产实践。结果表明：通过浮选将易浮金矿物、载金矿物及难抑制泥质产物优先富集至最终精矿；降低矿浆浓度，减少泥化矿物团聚对载金矿物的包覆；在确保氰化尾矿除氰效果正常的前提下，采用增加捕收剂加药点，强化对难选金矿物及载金矿物的捕收能力等3种措施，浮选作业金回收率提高了15.40百分点，精矿金品位由7.10 g/t提高至12.29 g/t;现场浮选生产指标稳定，月可增加经济效益约171万元。该工艺改进可为类似矿山生产提供指导。