在套管或衬管与周围的水泥环之间所形成的小间隙，这些间隙是由于在固井期间或固井之后温度或压力的变化所致。
A small gap that can form between the casing or liner and the surrounding cement sheath, most commonly formed by variations in temperature or pressure during or after the cementing process.
连接两节管子(生产油管、套管或衬管等)所用的带螺纹的连接件。
A threaded coupling used to join two lengths of pipe such as production tubing, casing or liner.
另外，在没有安装任何套管或衬管的情况下，在储层段的选择性处理或补救作业则更为困难。
Also, without any casing or liner installed, selective treatments or remedial work within the reservoir section are more difficult.
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