设计一种小粒径气力滚筒式排种器,以油菜种子为小粒径种子代表,通过对排种器负压携种区油菜种子的受力分析,确定正常工作的最小负压为0.45 k Pa。对排种器进行试验分析,选择排种滚筒转速、负压室负压、正压室正压为试验因素,得出各试验...设计一种小粒径气力滚筒式排种器,以油菜种子为小粒径种子代表,通过对排种器负压携种区油菜种子的受力分析,确定正常工作的最小负压为0.45 k Pa。对排种器进行试验分析,选择排种滚筒转速、负压室负压、正压室正压为试验因素,得出各试验因素与试验指标的关系。通过正交试验结果分析出各试验因素对试验指标影响大小,给出最优搭配。结果表明,当排种滚筒转速为25 r/min,负压室负压为2 k Pa,正压室正压为100 Pa时,种子合格指数为93.26%,重播指数为4.95%,漏播指数为2.11%,为排种器结构和性能参数进一步优化提供试验和理论依据。展开更多
In order to accurately predict the productivity of herringbone multilateral well,a new productivity prediction model was founded.And based on this model,orthogonal test and multiple factor variance analysis were appli...In order to accurately predict the productivity of herringbone multilateral well,a new productivity prediction model was founded.And based on this model,orthogonal test and multiple factor variance analysis were applied to study optimization design of herringbone multilateral well.According to the characteristics of herringbone multilateral well,by using pressure superposition and mirror image reflection theory,the coupled model of herringbone multilateral well was developed on the basis of a three-dimensional pseudo-pressure distribution model for horizontal wells.The model was formulated in consideration of friction loss,acceleration loss of the wellbore and mixed loss at the confluence of main wellbore and branched one.After mathematical simulation on productivity of the herringbone multilateral well with the coupled model,the effects of well configuration on productivity were analyzed.The results show that lateral number is the most important factor,length of main wellbore and length of branched wellbore are the secondary ones,angle between main and branched one has the least influence.展开更多
文摘设计一种小粒径气力滚筒式排种器,以油菜种子为小粒径种子代表,通过对排种器负压携种区油菜种子的受力分析,确定正常工作的最小负压为0.45 k Pa。对排种器进行试验分析,选择排种滚筒转速、负压室负压、正压室正压为试验因素,得出各试验因素与试验指标的关系。通过正交试验结果分析出各试验因素对试验指标影响大小,给出最优搭配。结果表明,当排种滚筒转速为25 r/min,负压室负压为2 k Pa,正压室正压为100 Pa时,种子合格指数为93.26%,重播指数为4.95%,漏播指数为2.11%,为排种器结构和性能参数进一步优化提供试验和理论依据。
基金Project(12521044) supported by Scientific and Technological Research Program of Heilongjiang Provincial Education Department,China
文摘In order to accurately predict the productivity of herringbone multilateral well,a new productivity prediction model was founded.And based on this model,orthogonal test and multiple factor variance analysis were applied to study optimization design of herringbone multilateral well.According to the characteristics of herringbone multilateral well,by using pressure superposition and mirror image reflection theory,the coupled model of herringbone multilateral well was developed on the basis of a three-dimensional pseudo-pressure distribution model for horizontal wells.The model was formulated in consideration of friction loss,acceleration loss of the wellbore and mixed loss at the confluence of main wellbore and branched one.After mathematical simulation on productivity of the herringbone multilateral well with the coupled model,the effects of well configuration on productivity were analyzed.The results show that lateral number is the most important factor,length of main wellbore and length of branched wellbore are the secondary ones,angle between main and branched one has the least influence.
