摘要：Geological carbon sequestration (GCS) is an essential technology for reducing carbon emissions. Wellbore integrity is crucial to ensure the safety of GCS. During low -temperature carbon dioxide (CO 2 ) injection, the wellbore temperature decreases, causing the tubing and casing to contract, resulting in considerable axial tensile stresses, and making mechanical failure likely. This paper establishes a transient flow model for CO 2 injection to predict the temperature and pressure distribution in the wellbore. Then, the strength safety factor of the tubing and casing is calculated using the material strength criteria. Fracture mechanics theory is employed to analyze the risk of crack propagation in defective tubing or casing during CO 2 injection. The study indicates that the wellbore temperature near the wellhead is lower as CO 2 is injected. Under typical injection conditions, the tubing and casing have high strength safety factors but small crack propagation factors. The stress intensity factor of cracks on the tubing and casing ' s outer surface is more significant than inner surface defects, posing a higher risk of crack propagation. When the tubing or casing exits a penetrating crack, its propagation safety factor is less than 1, necessitating the avoidance of through -wall cracks. The results guide maintaining wellbore integrity in carbon dioxide geological sequestration engineering.

关键字：CO2 injection; Tubing and casing; Strength failure; Crack extension

ISSN号：2949-8929

卷、期、页：卷237

发表日期：2024-06-01

期刊分区（SCI为中科院分区）：二区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：GEOENERGY SCIENCE AND ENGINEERING

参与作者：鄢长灏,吕伟,李建山,赵海峰

通讯作者：马昭旭,黄春妍

第一作者：王宴滨,董雪林

论文类型：期刊论文

论文概要：鄢长灏,吕伟,李建山,赵海峰,马昭旭,黄春妍,王宴滨,董雪林，Mechanical integrity of tubular elements based on strength and fracture criteria during transient CO 2 injection，GEOENERGY SCIENCE AND ENGINEERING，2024，卷237

论文题目：Mechanical integrity of tubular elements based on strength and fracture criteria during transient CO 2 injection