地热井表层套管常见事故及处理技术.doc

地热井表层套管常见事故及处理技术
张勇1,2 彭新明1
(,北京 100143;,北京 100081)
关键词:地热井;表层套管;事故;处理
Common accidents and handling technology of Geothermal well surface casing/ZHANG Yong1,2, PENG Xin-ming1 (1. Beijing Geothermal Institute, Beijing 100143, China; Institute of Technology,Beijing 100081, China)
Abstract: This article mon accidents and handling technology of Geothermal well surface casing, and the essful treatment of two cases of geothermal well surface casing accidents. 1. Threaded connections of geothermal well surface casing were broken; 2. Geothermal well surface casing was pulled trough damage. And propose measures to prevent surface casing accident: Casing and surface casing overlapping, there are no threaded connections within 2 meters above the casing nozzle, Casing pipe can be slightly adjusted before casing. surface casing pipe centralizer should be used. We must correct "three-point line " before second spud, third spud and fourth spud. For the injection well, We mend casing pipe string to + structure, and pipe thread receiving surface, instead of the overlay.
Key words: geothermal well; surface casing; accident; treatment
1 前言
北京地区2000m以深的地热井一般采用四级井身结构,,× J55表层套管,水泥固井返至地表;,× N80技术套管,,全套管环空水泥封固;,×() N