基于KT模型的椭圆度对套管抗挤强度的影响  

Effect of ovality on casing collapse strength based on KT model

作　　者：范森[1] 陈顶峰 冯雷[3] 冯福平[1] 雷扬[1] 韩旭[1] FAN Sen CHEN Dingfeng FENG Lei FENG Fuping LEI Yang HAN Xu(l.College of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China Fuyu Oil Production Plant, Jilin Oilfield Company, Songyuan 138000, China FEngineering Technology Company, CNOOC Energy Technology ＆ Services Limited,Tanggu 300452, China)

机构地区：[1]东北石油大学石油工程学院,黑龙江大庆163318 [2]中国石油吉林油田扶余采油厂,吉林松原138000 [3]中海油能源发展股份有限公司工程技术分公司,天津300452

出　　处：《断块油气田》2017年第3期426-429,共4页Fault-Block Oil & Gas Field

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)

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。The ovality can reduce the casing collapse strength, but the effect of ovality on casing collapse strength is uncertainBased on the collapse strength of KT model and calculation of the average outer diameter of the casing, the calculation model oovality and casing collapse strength was established. The conclusions are obtained： the casing collapse strength decreases with theincrease of ovality, but the trend slows down gradually; the lost of casing collapse strength increases with the increase of D/t at firsand then decreases, there is a critical value of D/t which can get the maximum lost of collapse strength; the critical value of D/t issmall when the grade of casing is high, it means that the maximum lost of collapse strength in high grade of casing with ovalityhappens when D/t is small. The result reveals the degree and rule of the effect of ovality on casing collapse strength, which canfurther deepen the understanding of the effect of ovality on casing collapse strength.

关 键 词：套管抗挤强度 椭圆度 KT模型 径厚比 钢级 

分 类 号：TE256.2[石油与天然气工程—油气井工程]