The solid expandable tubular (SET), as a casing damaged well repair tool, should resist residual stress and liquid corrosion. The objective of this study is to reveal the SET expansion of mechanical properties and anti-corrosion performance to carry out a feasibility laboratory expansion experiment. The materials used in this study are 20G and 316L. The mechanical properties of the expansion process of materials and the corrosion behavior of the tube in two kinds of the simulated formation water environment are investigated. Scanning electron microscope (SEM)-energy spectrometer (EDS) comparative analysis displays the surface microstructure and corrosion products of the two materials in different corrosive environments. The results show that both SET materials can meet the requirements of 5–1/2in casing subsidy. The corrosion rate of 20G is similar, which is equivalent to reducing the thickness by 0.25 mm every 10 years, and the 316L corrosion rate is about one-fifth of 20G. The corroded surfaces of 20G and N80 are multi-crack brittle scales caused by iron oxidation. The surface of 316L has attachments without apparent corrosion. Compared with the N80 shell material, the corrosion product film of 20G is denser and has better corrosion resistance. The corrosion resistance of 316L SET is the strongest among these three materials and is suitable for harsh right conditions in corrosive environments.

作为套管损坏的修井工具的固态可膨胀管（SET），应能抵抗残余应力和液体腐蚀。这项研究的目的是揭示SET扩展的机械性能和防腐性能，以进行可行性的实验室扩展实验。本研究中使用的材料是20G和316L。研究了两种模拟地层水环境中材料膨胀过程的力学性能以及管材的腐蚀行为。扫描电子显微镜（SEM）-能谱仪（EDS）的对比分析显示了两种材料在不同腐蚀环境下的表面微观结构和腐蚀产物。结果表明，两种SET材料都可以满足5–1 / 2英寸套管补贴的要求。20G的腐蚀速率相似，相当于每10年减少0.25毫米的厚度，而316L腐蚀速率约为20G的五分之一。20G和N80的腐蚀表面是由铁氧化引起的多裂纹脆性氧化皮。316L的表面有附着物，没有明显的腐蚀。与N80外壳材料相比，20G的腐蚀产物膜更致密且具有更好的耐腐蚀性。316L SET的耐腐蚀性是这三种材料中最强的，适用于腐蚀性环境中的苛刻条件。316L的表面有附着物，没有明显的腐蚀。与N80外壳材料相比，20G的腐蚀产物膜更致密且具有更好的耐腐蚀性。316L SET的耐腐蚀性是这三种材料中最强的，适用于腐蚀性环境中的苛刻条件。316L的表面有附着物，没有明显的腐蚀。与N80外壳材料相比，20G的腐蚀产物膜更致密且具有更好的耐腐蚀性。316L SET的耐腐蚀性是这三种材料中最强的，适用于腐蚀性环境中的苛刻条件。