【摘要】 常用射孔布孔方案可分为单孔(单母线),2孔,4孔(螺旋布孔),6孔,8孔等几种方案。射孔管的挤毁压力可以用poro=Kpcs表示。文章认为,苏联依列敏柯提出的油井套管挤毁压力计算方法正确地反映了管的挤毁实质,并且其计算值与实脸值吻合较好,因此采用依列敏柯法计算按照杆管相似理论并考虑到孔边的应力集中效应,作者推导出射孔管挤毁压力降低系数K值的计算公式。用16个不同布孔方案的N-80外径D=5(2/1)″管试件作了试验,试验结果与计算值吻合较好。本文并探讨了射孔管参数及布孔方案对K值的影响。更多还原

【Abstract】 The perforated section of an oil well casing is the weakened section more vulnerable to collapse under external loading. The collapse pressure of a perforated cylinder can be expressed by the collapse pressure of a non-perforated cylinder multiplied by a factor of reduction due to perforation“K”. The equation of a Soviet scientist T.E. Eleiminko can be reasonably used to calculate the collapse pressure of a well casing and tubing. An equation for calculating the reduction factor“K”is proposed according to the similarity of tube and bar and the stress concentration at the hole opening. Sixteen samples of N-80, 51/2 in OD cylinder test piece with different hole distribution were tested for collapse and the experimental results agreed satisfactorily with those calculated results. The effects of perforated tubing parameters and hole distribution are discussed.更多还原