蠕变性地层中套管有效外挤压力的计算方法探讨

The Calculation of the Effective External Pressure on Casing in Creep Formation

李子丰 杨海军 陈飞

Li Zifeng Yang Haijun Chen Fei

燕山大学石油工程研究所, 河北秦皇岛 066004; 中国石油西气东输管道公司储气库管理处, 江苏金坛 213251

Petroleum Engineering Institute, Yanshan University, Qinhuangdao, Hebei, 066004, China; Gas Storage Project Department, West-to-East Gas Pipeline Company, PetroChina, Jintan, Jiangsu, 213251, China

在套管柱设计中，套管外挤压力的计算十分重要。在《钻井手册（甲方）》中，蠕变性地层段的套管外挤压力取为上覆岩层压力，而SY/T 5724—2008《套管柱结构与强度设计》中却将蠕变性地层段套管的外挤压力与岩石的泊松比联系起来，二者不相容。结合钻井施工过程的岩石力学理论，对蠕变性地层段的套管有效外挤压力进行分析。结果表明，SY/T 5724—2008《套管柱结构与强度设计》中关于蠕变性地层段的套管有效外挤压力的计算公式是错误的。建议采用《钻井手册（甲方）》中的蠕变性地层段的套管有效外挤压力计算公式进行套管柱结构设计。

In the design of casing string,the calculation of external pressure on casing is very important.In the Drilling Manual(Party A),the overburden pressure of the formations is taken as the external pressure on casing in the creep formation section,while the standards of The Structure and Strength of the Casing String Design(SY/T 5724-2008)sets the external pressure of casing as a function of rock Poisson’s ratio.Combining drilling process and rock mechanics theory,the external pressure on casing in the creep formation section is analyzed.The result shows that the formula for effective external pressure on casing in creep formation section in the standards of The Structure and Strength of the Casing String Design(SY/T 5724-2008)is incorrect.It is recommended that the formula for effective external pressure on casing in creep formation section in Drilling Manual(Party A)be used in casing design.

国家自然科学"考虑钻井液动力润滑作用的旋转钻柱涡动状态研究（No.51244004）"和"基于最小功耗率原理和钻井液动力润滑作用的钻柱涡动理论与实验研究（No.51374183）"资助。

https://doi.org/10.3969/j.issn.1001-0890.2014.03.003