Method for obtaining casing and cement interface shear coupling stiffness from cased well acoustic logging

• Main Authors: RAO BO, TANG XIAOMING, LI SHENGQING, CHEN XUELIAN, SU YUANDA, JIANG CAN
• Format: Patent
• Language: Chinese; English
• Published: 01.01.2021
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a method for obtaining casing and cement interface shear coupling stiffness from cased well acoustic logging. A sliding interface boundary condition is adopted to describe a non-good contact interface between a casing and a stratum, and the boundary condition is introduced into the field of well cementation acoustic logging. A well cementation acoustic logging model characterized by a slip interface is adopted to effectively simulate various complex coupling conditions of the casing and the stratum. Compared with an existing classical theory, by using the method of theinvention, an acoustic logging response problem of the cement interface under a complex cementing condition from complete non-cementing to complete cementing and in a transition state can be described, and a new way is provided for solving practical application problems. 本发明公开了一种从套管井声波测井中获取套管与水泥界面剪切耦合刚度的方法，采用滑移界面边界条件来描述套管与地层之间的这种非良好接触界面，将这一边界条件引入了固井声波测井领域，采用滑移界面表征的固井声波测井模型，用来有效地模拟套管与地层的各种复杂的耦合情况。本发明与现有的经典理论相比可以描述水泥界面从完全不胶