Casing eccentricity is the necessary prerequisite and important condition to improve cementing quality for high-pressure, high-temperature (HPHT) wells in unconventional oil and gas fields and hot dry rock fields. So, the casing must be placed in the center of the wellbore through some centralizers. However, due to the change of well trajectory angle, improper arrangement of casing centralizer, the borehole enlargement, the borehole washout, nonstandard operation during cementing, and so on, the casing might not be centered in the wellbore.^1–3 With the exploration and development of shale gas, tight sandstone gas, and offshore oil and gas resources, horizontal well, extended reach well, highly deviated well, or horizontal branch well are widely used in these fields. The construction of these wells makes casing eccentricity more complicated.^4,5 The casing eccentricity causes many bed effects, such as influence on interface stability and efficiency of displacement fluid, influence on the measurement result of sonic logging instrument and reducing the wellbore integrity safety, casing collapse strength, and casing–cement bond surface strength. And, the final one is the biggest impact on the production process of the wellbore among these impacts.^6–8 Through investigation and research, the separation of the interface between casing and cement sheath directly produced one way to escape for oil and gas. Such behaviors will cause air pollution, water pollution, soil pollution, greenhouse effect, or production accidents, such as oil spill in the Gulf of Mexico in 2010. In this case, the casing eccentricity as an inevitable issue directly affects the wellbore integrity. In addition, the interfacial behavior (separation or debonding) of the casing–cement sheath also plays an important role in the HPHT wellbore integrity. Thereby, it is crucial to investigate the interfacial behavior of the casing–cement sheath of the eccentric cased wellbore to evaluate the wellbore integrity of HPHT gas wells in unconventional oil and gas fields and hot dry rock fields.

中文翻译：

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基于粘性元素的模型，在考虑套管偏心率的情况下，评估高压高温井眼套管-水泥护套的界面行为

套管偏心距是提高非常规油气田和干热岩田高压，高温（HPHT）井固井质量的必要前提和重要条件。因此，套管必须通过一些扶正器放置在井眼的中心。但是，由于井眼轨迹角的变化，套管扶正器的布置不当，井眼扩大，井眼冲刷，固井过程中的非常规操作等，套管可能无法在井眼中居中。^1–3随着页岩气，致密砂岩气和海上油气资源的勘探开发，水平井，延伸井，高度偏斜井或水平分支井在这些领域得到了广泛的应用。这些井的建造使套管偏心率更加复杂。^4,5套管偏心引起许多层效应，例如对界面稳定性和驱替液效率的影响，对声波测井仪的测量结果的影响以及降低井筒完整性安全性，套管塌陷强度和套管-水泥粘结面强度的影响。 。并且，最后一个是这些影响中对井眼生产过程的最大影响。^6–8通过调查研究，套管与水泥护套之间界面的分离直接产生了一种逃逸油气的方法。这种行为将导致空气污染，水污染，土壤污染，温室效应或生产事故，例如2010年墨西哥湾漏油。在这种情况下，套管偏心率是不可避免的问题，直接影响井眼的完整性。此外，套管-水泥护套的界面行为（分离或剥离）在HPHT井筒完整性中也起着重要作用。因此，至关重要的是研究偏心套管井筒的套管-水泥鞘的界面行为，以评估非常规油气田和干热岩田中HPHT气井的井筒完整性。