Effect of casing internal pressure on integrity of cement ring in marine shallow formation based on XFEM. (January 2020)

• Record Type: Journal Article
• Authors: Guo, Shenglai; Bu, Yuhuan; Yang, Xin; Wang, Chunyu; Guo, Bingliang; Sun, Baojiang
• Is Part Of: Engineering failure analysis. Volume 108(2020)
• Publication Date: 2020-01
• Subjects: Casing internal pressure -- Integrity -- Cement ring -- Marine shallow formation -- XFEM; System failures (Engineering) -- Periodicals; Fracture mechanics -- Periodicals; Reliability (Engineering) -- Periodicals; Pannes -- Périodiques; Rupture, Mécanique de la -- Périodiques; Fiabilité -- Périodiques; Fracture mechanics; Reliability (Engineering); System failures (Engineering); Periodicals; Electronic journals; 620.112
• DOI: 10.1016/j.engfailanal.2019.104258
• Languages: English
• ISSNs: 1350-6307

Abstract

Highlights: XFEM was used to simulate the failure of cement ring with initial cracks. The cement ring mainly subjected to circumferential tensile stress. The influence of changing ICP on the sealing integrity of cement ring was studied. Abstract: The integrity of cement ring is critical for the safe production of crude oil and natural gas and the protection of marine environment in deep water shallow formation. Due to the poor support of the shallow formation to the cement ring, the cement ring is easily damaged by the casing internal pressure (CIP). Based on extended finite element method (XFEM), the effect of CIP on the integrity of cement ring was investigated in this paper. A casing-cement-formation (CCF) combination model was established. Under different structure and mechanical properties of the cement ring, and different mechanical properties of the shallow formation, the maximum casing internal pressure (MCIP) when cement ring was broken was studied. This paper is of great significance to study the failure mechanism of cement ring integrity in deep water shallow formation, and has guidance for proposing corresponding rationalization suggestions and measures.