Drag reduction phenomenon in pipelines has received lots of attention during the past decades due to its potential engineering applications, especially in fluid transporting industries. Various methods to enhance drag...Drag reduction phenomenon in pipelines has received lots of attention during the past decades due to its potential engineering applications, especially in fluid transporting industries. Various methods to enhance drag reduction have been developed throughout the years and divided into two categories;non-additives method and additives method. Both categories have different types of methods, with different formulations and applications which will generally be discussed in this review. Among all the methods discussed, drag reduction using polymer additive is as one of the most enticing and desirable methods. It has been the subject of research in this field and has been studied extensively for quite some time. It is due to its ability to reduce drag up to 80% when added in minute concentrations. Reducing drag in the pipe will require less pumping power thus offering economic relieves to the industries. So, this paper will be focusing more on the use of polymer additives as drag reducing agent, the general formulations of the additives, major issues involving the use of drag reducing polymers, and the potential applications of it. However, despite the extensive works of drag reduction polymer, there are still no models that accurately explain the mechanism of drag reduction. More studies needed to be done to have a better understanding of the phenomenon. Therefore, future research areas and potential approaches are proposed for future work.展开更多
为了保证钻井作业安全、提高经济效益,研究钻柱在岩屑影响下的摩阻扭矩并及时准确地预测卡钻事故的发生具有重要意义。提出了一种考虑岩屑影响的卡钻预测方法,将摩阻扭矩分段计算模型与基于群体训练(population based training,PBT)优...为了保证钻井作业安全、提高经济效益,研究钻柱在岩屑影响下的摩阻扭矩并及时准确地预测卡钻事故的发生具有重要意义。提出了一种考虑岩屑影响的卡钻预测方法,将摩阻扭矩分段计算模型与基于群体训练(population based training,PBT)优化算法耦合,利用训练得到最优摩阻系数,开展模型计算预测值与现场监测数据的对比,并计算卡钻风险预测系数,实现钻进过程中卡钻风险的实时预测。利用该方法开展现场试验,发现钻井遇卡前的卡钻风险预测系数大幅增大,有效预测了卡钻事故的发生。分析结果表明:岩屑堆积使钻柱的摩阻值增大,同时钻柱摩阻值随井眼曲率、钻柱刚度、摩阻系数的增加而增加。展开更多
基金supported by the Ministry of Higher Education, Malaysia [grant number FRG0416-TK-1/2015]UMSGreat funding from Universiti Malaysia Sabah [grant number GUG0052-TK2/2016]
文摘Drag reduction phenomenon in pipelines has received lots of attention during the past decades due to its potential engineering applications, especially in fluid transporting industries. Various methods to enhance drag reduction have been developed throughout the years and divided into two categories;non-additives method and additives method. Both categories have different types of methods, with different formulations and applications which will generally be discussed in this review. Among all the methods discussed, drag reduction using polymer additive is as one of the most enticing and desirable methods. It has been the subject of research in this field and has been studied extensively for quite some time. It is due to its ability to reduce drag up to 80% when added in minute concentrations. Reducing drag in the pipe will require less pumping power thus offering economic relieves to the industries. So, this paper will be focusing more on the use of polymer additives as drag reducing agent, the general formulations of the additives, major issues involving the use of drag reducing polymers, and the potential applications of it. However, despite the extensive works of drag reduction polymer, there are still no models that accurately explain the mechanism of drag reduction. More studies needed to be done to have a better understanding of the phenomenon. Therefore, future research areas and potential approaches are proposed for future work.
文摘为了保证钻井作业安全、提高经济效益,研究钻柱在岩屑影响下的摩阻扭矩并及时准确地预测卡钻事故的发生具有重要意义。提出了一种考虑岩屑影响的卡钻预测方法,将摩阻扭矩分段计算模型与基于群体训练(population based training,PBT)优化算法耦合,利用训练得到最优摩阻系数,开展模型计算预测值与现场监测数据的对比,并计算卡钻风险预测系数,实现钻进过程中卡钻风险的实时预测。利用该方法开展现场试验,发现钻井遇卡前的卡钻风险预测系数大幅增大,有效预测了卡钻事故的发生。分析结果表明:岩屑堆积使钻柱的摩阻值增大,同时钻柱摩阻值随井眼曲率、钻柱刚度、摩阻系数的增加而增加。
