基于KT模型的椭圆度对套管抗挤强度的影响

发布时间：2018-01-15 20:19

本文关键词：基于KT模型的椭圆度对套管抗挤强度的影响　出处：《断块油气田》2017年03期 　论文类型：期刊论文

【摘要】：椭圆度会降低套管的抗挤强度,但对其影响程度及规律并未得到统一认识。文中以考虑因素较为全面的KT抗挤强度计算模型为基础,建立了椭圆度与套管抗挤强度关系模型。研究结果认为:套管的抗挤强度随椭圆度的增大而降低,但降低趋势逐渐变缓;套管的抗挤强度降低值随径厚比(D/t)的增大呈先增大后减小的趋势,存在一个临界D/t值,可使椭圆形套管的抗挤强度降低值最大;钢级越高,椭圆形套管的抗挤强度降低值最大的临界D/t值越小。文中较为全面地揭示了椭圆度对套管抗挤强度的影响程度及规律,进一步深化了椭圆度对套管抗挤强度影响的认识。
[Abstract]:The ellipticity can reduce the strength of casing, but the influence degree and law of casing are not unified. This paper is based on the KT model which takes factors into account. The model of the relation between the ellipticity and the collapsing strength of the casing is established. The results show that the collapsing strength of the casing decreases with the increase of the ellipticity, but the decreasing trend becomes slower. With the increase of diameter to thickness ratio (D / t), the reducing value of collapsing strength of casing increases first and then decreases, and there exists a critical D / t value, which can make the maximum value of reducing the strength of anti-squeezing strength of elliptical casing. The higher the steel grade is, the smaller the critical D / t value is, which is the maximum value of reducing strength of the elliptical casing. The influence of ellipticity on the collapsing strength of the casing is revealed in this paper. The effect of ellipticity on casing collapsing strength is further deepened.
【作者单位】：东北石油大学石油工程学院;中国石油吉林油田扶余采油厂;中海油能源发展股份有限公司工程技术分公司;
【基金】：中国石油天然气集团公司重大科技专项“重大工程关键技术装备研究与应用-储层改造工作液与关键工具研发”(2013E-3807)
【分类号】：TE931.2
【正文快照】： 0引言套管挤毁破坏是目前各大油田套管损坏的主要形式[1￣3],长期以来套管抗挤强度主要通过API Bul5C3—1994标准公布的公式计算,但该公式存在计算精度偏低、对套管强度性能的影响因素考虑不全面等不足。为此,API/ISO工作组对世界各国学者提出的11种抗挤强度计算模型进行了

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