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石油钻具在钻井作业中,要承受拉、扭、压弯等多种应力作用,同时受到泥浆的冲刷和腐蚀,服役条件十分苛刻。为了提高生产安全效率,对钻具的损伤情况和预期寿命有必要做认真检测。基于金属磁记忆检测技术,提出一种适合钻井现场使用的钻具适用性评价方法,用以评价在役钻具的使用状况,检测出不能继续使用的钻具,从而有效避免井下钻具事故的发生。通过理论推导与现场试验建立了钻具磁记忆检测信号与应力水平的试验关系,用断裂力学原理建立钻具的应力强度因子模型,利用FAD图对钻具的无损评价进行初步尝试,现场试验表明该方法对钻具的评价具有指导意义。
Oil drilling tools in drilling operations, to withstand pull, twist, bending and other stress, while being subject to erosion and erosion of mud, service conditions are very harsh. In order to improve the safety and efficiency of production, it is necessary to carefully test the damage and life expectancy of the drilling tools. Based on the metal magnetic memory testing technology, this paper presents a drilling tool suitability evaluation method suitable for drilling site to assess the service status of drilling tools in service and detect the drilling tools that can not be used continuously, so as to effectively avoid the accidents of downhole drilling tools occur. Through the theoretical derivation and on-site test, the experimental relationship between the signal and the stress level of the magnetic memory testing tool was established. The stress intensity factor model of the drill tool was established by using the fracture mechanics principle. The FAD graph was used to make a preliminary attempt on the nondestructive evaluation of the drilling tool. This method is instructive for the evaluation of drilling tools.