论文部分内容阅读
在现行的钻柱设计中,一般是考虑钻柱自重产生的拉力负荷,采用一定安全系数,自下而上地组成等强度钻柱。但随着钻井深度的加大,只考虑拉伸负荷来设计钻柱就不能全面反映钻柱的实际受力条件和保证钻柱工作安全。我们知道,在起下钻时卡瓦对钻杆作用一个挤压力,此力总是大于钻柱的拉伸负荷。由于深井钻柱的拉伸负荷大,所产生的横向负荷也很大,容易引起钻柱在卡瓦处的挤毁。所以在设计深井钻柱时必须加
In the current design of the drill string, the tensile load generated by the weight of the drill string is generally taken into consideration. A certain safety factor is adopted to make the drill string of equal strength from bottom to top. However, with the drilling depth increasing, only considering the tensile load to design the drill string can not fully reflect the actual stress conditions of the drill string and ensure the safe working of the drill string. We know that during the drill, the slips exert a squeezing force on the drill string, which is always greater than the tensile load on the drill string. Due to the large tensile load of deep well drill string, the transverse load generated is also large, which can easily cause the drill string to collapse at the slip. Therefore, the design of deep drill string must be added