A Number Of Key Issues In Oil And Gas Dra Theoretical Research And Application Development Technology,

The energy demand is more and more with the developing world economy, while the storage and transportation of hydrocarbon are the important technology for energy utilization. In many transportation modes, pipeline transportation developed fast because of rapid building speed, small floor area, low energy loss and few limitations by geography and weather conditions. At present, the most oil and natural gas produced in the world were transported by pipelines.But, the pipeline transportation also has serious defect that its elastic transportation volume is lower than other transportation systems. It is hard to forecast exactly oil reserves during oil exploration, and the foreground of oil field also has some unsure factors. The reserves of oil field will even be accurately measured in future, while, the oil field also has developing stage, producing stage and decreasing stage, and the demand of oil products in every area will be various because of the economical development and the updating oil products. So, the elastic pipeline throughput is demanded. Otherwise, the throughput is needed to have certain adjusting ability, when the pressure tightness decreases caused by the aging of pipeline, and when one of parallel pipelines is needed to be examined and repaired because of accidents with assurance of the flow rate.The best way to settle the said problems is using DRAs (drag reducing agents). The said DRAs are the chemical additives to reduce liquid flow friction and to increase flow rate. They are divided to be water base DRAs, oil base DRAs and gas base DRAs according to different using objects. DRAs used in crude oil and other correlative products are named oil base DRAs which mainly have the following several aspects of function.(1) The operating pressure of pipeline is reduced and the running safety coefficient is improved, which relate to the national economy safety to some extant.(2)If DRAs are planed to be used in new pipeline, the pipe diameter and the bump size will be reduced, the construction investment will be saved accordingly.