积垢不仅会堵塞孔眼 ,还会缩小油管的直径 ,甚至降低切断阀的工作性能 ,在无人值守的卫星平台、深水管线等流量问题无法保障的地方这种现象尤为突出。由于化学阻垢剂的费用昂贵 ,经营商总是尽可能地推迟投加阻垢剂的时间 ,直到万不得已方才使用阻垢剂 ,有时这样做会延误时机 , The fouling will not only block the perforations, but also reduce the diameter of the tubing and even reduce the performance of the cut-off valve. This phenomenon is especially notable where traffic problems such as unmanned satellite platforms and deep-water pipelines can not be guaranteed. Due to the high cost of chemical scale inhibitor, operators always postponed the scale inhibitor as much as possible until it was used as a last resort. Sometimes this would delay the opportunity,