Discussion on the Downhole Casing Technology for U Shape CBM Wells of Panzhuang Block
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摘要: 下入生产套管的煤层气U型井具有产气量高、成本低的优点,逐渐成为潘庄区块煤层气开发的主要井型。潘庄区块煤层埋深一般在500 m以浅,同时要求U型井的水平段在1000 m左右,生产套管的下入成为该区块垂深浅、水平段长的煤层气U型井的技术难题,经过多口井试验,优化钻井轨迹的平滑度,采用原钻具、短螺旋扶正器和生产套管内置钻铤3次划眼,以及严格控制下套管程序,可提高套管一次性下入的成功率,并提高生产效率。Abstract: Because of the advantages of high gas production and low cost,U-shaped CBM well with production casing has gradually become main well type.The buried depth of coalbed is generally less than 500m in Panzhuang block and the hori-zontal section for U-shaped well is required to be about 1000m.For the shallow vertical depth and long horizontal section, production casing running is a technical difficulty in U-shaped CBM well of this block.In the tests in several wells, by optimization of drilling trajectory smoothness, 3 times of sweeping with original drilling tools, short spiral centralizer and drill collar in production casing as well as strict control on casing lowering program, the success rate of one-time casing lowering can be increased with higher production efficiency.
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Key words:
- CBM /
- U shape well /
- horizontal well /
- casing running /
- Panzhuang block
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