摘要
深井小尺寸套管下入遇阻时 ,随着下放力的增加 ,将产生失稳弯曲。由于弯曲会造成套管与井壁的接触 ,会造成摩擦力增加 ,抵消了部分下放力 ,使作用在卡点处的有效下放力减少。根据经典的管柱弯曲理论和相关实验研究结果 ,可以建立深井小尺寸套管下入遇阻时最大下放力的计算模型。通过规律分析和实例验证 ,表明计算模型是比较合理性的 ,对比结果较吻合 ,为实际施工中发生下入遇阻情况、实施下压套管措施时 ,在保证安全有效的前提下 。
The bending failure stability accrued with the increase of the running load, when the small size casing, which was run into the wellbore under the deep well, encountered the resistance. The casing contacted the wellface and the friction load was increased between the casing and the wellface, because of the casing bends, counteracted some forces, which caused the running loads to decrease at the contact position. According to the typical drilling pipe bend theory and relative experimental results, the calculating model of the running casing encountered the resistance was established, the model is reasonable and reliable by the analysis and example verification, it provided the theoretical supports for the maximum load.
出处
《西南石油学院学报》
CSCD
2002年第2期44-45,共2页
Journal of Southwest Petroleum Institute
基金
中国石油天然气集团公司"九五"项目"异常压力对套馆的影响研究"(960 40 3 -0 3 )
关键词
深井
最大下放力
下套管
管柱弯曲
摩阻
running casing
drilling pipe bending
friction resistance
