海上9-5/8"套管-水泥环界面脱黏行为数值模拟

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中图分类号：TE52 文献标志码：A文章编号：1000-4939（2026）02-0376-11

Abstract：The high cementation force between casing and cement sheath is the biggest obstacle to casing recovery operations in ofshore abandoned wels.To explore the cementation failure process of the casingcement sheath interfaceunder external load，a three-dimensional finite element model of the casing-cement sheath-casing wellbore was established with ABAQUS finite element software.The cohesive element was used to simulate the debonding and expansion process of the casing-cement sheath interface，and laboratory experiments verified the model.Using thismodel，the effectsof the length of thecement sheath and the material parameters of the cohesive zone model such as the stiffness of the bonding surface and the fracture energy on the bonding failure of the casing-cement sheath interface and the pul-out force required for its failure are discussed.The results show that the error between the experimental and model results is within 5% .The test shows that the maximum drawing force of the casing is positively correlated with the length of the cement sheath，and the cement sheath of 1m length under this size needs about 1kN drawing force.The pull-out force required for the initial displacement of the casing increases with the increase of the interface stiffness，but the stiffness has little effect on the maximum pull-out force，and the change range is less than 1% . Increasing the fracture energy does not affect the rising section of the drawing force， but it can slow down the decline process of the drawing force.The established model can accurately simulate the debonding process of the casing-cement sheath interface.

Key words：casing retrieval；cohesive zone model；debonding；casing-cement sheath interface；experimental verification

随着油气资源的持续开采，进人生产中后期的老井或死井需进行临时弃井，便于后续开窗侧钻以达到增产增效的目的[1]。（剩余14478字）