李茂华,徐守余,牛卫东
LI Mao-hua1,XU Shou-yu1,NIU Wei-dong2(1.Earth Resource and Information Institute

• 1:中国石油大学地球资源与信息学院
• 2:中国石油大学地球资源与信息学院
• 3:胜利油田钻井二公司 山东东营257061
• 4:山东东营257061

摘要(Abstract)：

油田生产中射孔对套管力学性能影响较大,生产层段射孔套管损坏严重。建立水泥环-套管射孔模型,计算分析射孔套管应力变化。由分析得出,射孔是造成套管损坏的主要原因。射孔水泥环套管最大应力在射孔孔眼产生,沿孔径方向应力减小。水泥环对射孔套管的抗挤强度影响明显,随水泥环厚度增加,套管应力减小,抗挤强度增加。油田生产中,为节约成本,对射孔层段应该采用厚壁套管合并提高固井技术,保证水泥环与套管的牢固,可以提高射孔套管抗挤强度。射孔套管的孔密对套管水泥环应力影响较大,射孔套管-水泥环应力随射孔密的增加而增加。射孔相位角对套管应力影响较大,钻井完井应采用螺旋布孔,并保持相位角接近120,°可以提高射孔套管的抗挤强度。
In the process of oilfield production,perforation has much effects on casing mechanics performance,and serious damage of perforating casing in produced intervel is caused,thus cement hoop-casing perforation model is established and stress variation of perforation casing is analyzed.The analysis show that,perforation is a key reason which causes casing damage.Furthermore,maximum stress of casing of perforation cement hoop generates from eyehole and declines along pore diameter direction.The effects of cement on collapsing strength of perforation casing is obvious,and it increases with increase of cement thickness and casing stress declining.In the process of oilfield production,in order to save cost,thick wall casing amalgamated should be used to improve cementation technique for perforation interval,which can assure firm between cement hoop and casing and enhance collapsing strength of perforation casing.Casing cement hoop stress is largely influenced by pore density of perforation casing and increased with the increasing of perforation density.Drilling completion should use helical hole siting due to the large influence of perforation phase angle for casing stress and keep it close to 120°to improve collapsing strength of perforation casing.

关键词(KeyWords)： 射孔套管;水泥环;有限元;弹性模量;地应力
perforation casing;cement hoop;finite element;elastic modulus;ground stress

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气集团公司创新基金项目“渤海湾盆地油田地质灾害分布规律及控制因素研究”(04E7041)

作者(Author): 李茂华,徐守余,牛卫东
LI Mao-hua1,XU Shou-yu1,NIU Wei-dong2(1.Earth Resource and Information Institute

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