大位移井指测量深度等于或大于真实垂深2倍的井,大位移井井中最后一层套管顺利下入是大位Version:1.0Start HTML:0000000105 End HTML:0000000317 Start Fragment:0000000127 End Fragment:0000000299移井关键技术之一。随着水平位移和...大位移井指测量深度等于或大于真实垂深2倍的井,大位移井井中最后一层套管顺利下入是大位Version:1.0Start HTML:0000000105 End HTML:0000000317 Start Fragment:0000000127 End Fragment:0000000299移井关键技术之一。随着水平位移和水垂比的不断增加,井斜不断增大,井眼轨迹逐渐延长,会出现高水垂比,常常因摩阻较大、地层坍塌或导致尾管或其它完井管柱无法正常下入,不仅增加作业成本,而且耽误作业工期。在综合多次作业的基础上,创造性引入套管导向马达,辅助裸眼完井管柱下入,本文介绍了一口水平生产井利用套管导向马达顺利将尾管下入到位的案例,为下尾管作业或下裸眼完井管柱作业提供借鉴,为后续复杂井型下入下套管或尾管提供了宝贵经验。展开更多
针对J级航段急流滩施工中出现的船舶定位、抛锚移锚、破坏炮线、钻机套管垂直度控制等施工难题,传统施工方案无法开展施工作业。通过实践总结研发一套急流滩钻机船钻孔爆破施工关键技术。综合应用模块化组合船体、七锚缆船舶定位、套管...针对J级航段急流滩施工中出现的船舶定位、抛锚移锚、破坏炮线、钻机套管垂直度控制等施工难题,传统施工方案无法开展施工作业。通过实践总结研发一套急流滩钻机船钻孔爆破施工关键技术。综合应用模块化组合船体、七锚缆船舶定位、套管垂直导向系统、平行双滚筒锚机、起爆网路等炸礁施工关键技术,使施工船在任意航区调遣施工。在澜沧江244界碑—临沧港IV级航道整治建设工程中,航区内滩上流速为3.5~6.5 m s,险滩类型众多,采用本方案取得了良好的施工效果。在涡流、深急流等复杂条件下使用此方案,可以有效避免采用裸露爆破工艺炸药单耗高、不易控制的弊端,为急流滩施工提供了一种有效可行的施工方案。展开更多
The present work aims to evaluate the increase in the number of spot welds in the 16 × 16 type fuel assembly structure that connects guide thimbles and spacer grids, in order to provide a proper joint for this co...The present work aims to evaluate the increase in the number of spot welds in the 16 × 16 type fuel assembly structure that connects guide thimbles and spacer grids, in order to provide a proper joint for this connection. This new and improved process can provide more stiffness to the whole structure, since the number of spots raised from four to eight. A 3-D geometric model of a guide thimble section was generated in a CAD （computer aided design） program （SolidWorks）. After that, the geometric model was imported to a CAE （computer aided engineering） program （ANSYS Mechanical APDL, Release 14.0）, where the finite element model was built, considering the guide thimble geometry assembled with the spacer grid through the welded connections. Boundaries conditions were implemented in the model in order to simulate the correct physical behavior due to the operation of the fuel assembly inside the reactor. The analysis covered specific loads and displacements acting on the entire structure. The method used to solve this finite element analysis was a linear static simulation in order to perform the connection between a spacer grid cell and a guide thimble section. Hence, four models was evaluated, differing on the spot weld number in the spacer grid and guide thimble connection. The rotational stiffness results of each model were compared. The results acquired from four and eight spot weld were validated with physical test results. The behavior of the structure under the acting force/displacement and the related results of the analysis, mainly the stiffness, were satisfied. The results of this analysis were used to prove that the increasing spot welds number is an improvement in the dimensional stability when submitted to loads and displacements required on the fuel assembly design. This analysis aid to get more information of extreme importance such as, the pursuance to develop better manufacturing process and to improve the fuel assembly performance due to the increasing of the bum-up.展开更多
文摘大位移井指测量深度等于或大于真实垂深2倍的井,大位移井井中最后一层套管顺利下入是大位Version:1.0Start HTML:0000000105 End HTML:0000000317 Start Fragment:0000000127 End Fragment:0000000299移井关键技术之一。随着水平位移和水垂比的不断增加,井斜不断增大,井眼轨迹逐渐延长,会出现高水垂比,常常因摩阻较大、地层坍塌或导致尾管或其它完井管柱无法正常下入,不仅增加作业成本,而且耽误作业工期。在综合多次作业的基础上,创造性引入套管导向马达,辅助裸眼完井管柱下入,本文介绍了一口水平生产井利用套管导向马达顺利将尾管下入到位的案例,为下尾管作业或下裸眼完井管柱作业提供借鉴,为后续复杂井型下入下套管或尾管提供了宝贵经验。
文摘针对J级航段急流滩施工中出现的船舶定位、抛锚移锚、破坏炮线、钻机套管垂直度控制等施工难题,传统施工方案无法开展施工作业。通过实践总结研发一套急流滩钻机船钻孔爆破施工关键技术。综合应用模块化组合船体、七锚缆船舶定位、套管垂直导向系统、平行双滚筒锚机、起爆网路等炸礁施工关键技术,使施工船在任意航区调遣施工。在澜沧江244界碑—临沧港IV级航道整治建设工程中,航区内滩上流速为3.5~6.5 m s,险滩类型众多,采用本方案取得了良好的施工效果。在涡流、深急流等复杂条件下使用此方案,可以有效避免采用裸露爆破工艺炸药单耗高、不易控制的弊端,为急流滩施工提供了一种有效可行的施工方案。
文摘The present work aims to evaluate the increase in the number of spot welds in the 16 × 16 type fuel assembly structure that connects guide thimbles and spacer grids, in order to provide a proper joint for this connection. This new and improved process can provide more stiffness to the whole structure, since the number of spots raised from four to eight. A 3-D geometric model of a guide thimble section was generated in a CAD （computer aided design） program （SolidWorks）. After that, the geometric model was imported to a CAE （computer aided engineering） program （ANSYS Mechanical APDL, Release 14.0）, where the finite element model was built, considering the guide thimble geometry assembled with the spacer grid through the welded connections. Boundaries conditions were implemented in the model in order to simulate the correct physical behavior due to the operation of the fuel assembly inside the reactor. The analysis covered specific loads and displacements acting on the entire structure. The method used to solve this finite element analysis was a linear static simulation in order to perform the connection between a spacer grid cell and a guide thimble section. Hence, four models was evaluated, differing on the spot weld number in the spacer grid and guide thimble connection. The rotational stiffness results of each model were compared. The results acquired from four and eight spot weld were validated with physical test results. The behavior of the structure under the acting force/displacement and the related results of the analysis, mainly the stiffness, were satisfied. The results of this analysis were used to prove that the increasing spot welds number is an improvement in the dimensional stability when submitted to loads and displacements required on the fuel assembly design. This analysis aid to get more information of extreme importance such as, the pursuance to develop better manufacturing process and to improve the fuel assembly performance due to the increasing of the bum-up.
