作　　者： ; ;

机构地区： 中国石油大学北京

出　　处： 《钻采工艺》 2009年第5期70-72,128,共3页

摘　　要： 由于多种原因,高温高压深井试油过程中发生了多起上部油管在小于其抗挤强度情况下的挤扁事故。为此,首先进行了油管质量复查,排除了油管质量问题。然后,以XS井为例进行了井下油管受力分析。分析表明,高温高压深井试油井下油管在井口挤扁的主要原因为:井口油管在轴向拉力作用下抗外挤强度降低,温度效应引起的轴向附加力加大了井口油管所受的轴向拉力,进一步降低了井口油管抗挤强度。加强检测,杜绝"带伤"油管下井,根据计算施加合适的井口环空平衡压力,选择合适油嘴反排并控制反排压力与速度,杜绝敞喷,适时减小或卸掉环空压力,可以防止试油井下油管在井口挤扁。 Because various reasons,the tubing near wellhead was collapsed during well testing in high pressure and high temperature deep well when the outer pressure was less than collapsing strength.To find the reasons in the abnormally collapse and countermeasures,first the quality of the tubing was checked.It was founded that the collapse was not resulted from the defect of the tubing.Then,force and stress exerted in the tubing was analyzed taking XS2 well as an example.The analysis results were concluded as follows:the collapsing strength of tubing decreased due to the axial tensile,which is serious at the upper tubing especially.During injecting,the additional axial force that was caused by the temperature effect increased the tubing near wellhead to suffer axial tensile and further reduced the collapsing strength of tubing near wellhead.Reinforcing detection,prohibiting defect tubing to trip in hole,according to the calculation to impose appropriate annular pressure,selecting size nozzle to reverse pumping and controlling the reverse pumping speed and pressure,prohibiting to be opened flow and reducing or releasing the annular pressure can prevent the down-hole well testing tubing being collapsed at the wellhead.

关 键 词： 高温高压深井 试油 油管 挤毁 分析

领　　域： [石油与天然气工程]