Cementation of long open hole in Shunbei block, Tarim Basin
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摘要: 塔里木盆地顺北区块地质条件复杂，储层埋藏深（大于7 500 m），二叠系火成岩漏失严重，志留系承压能力低，上奥陶统发育辉绿岩侵入体，坍塌应力高。优化井身结构后将193.7 mm套管直下至侵入体顶，固井面临套管下入深（7 000 m）、固井漏失风险大的技术难题。通过优化浆柱结构、扶正器设计，在低密度水泥浆中加入温敏记忆堵漏材料，提高水泥浆堵漏能力，优化防漏固井工艺，井口反挤低密度水泥浆等措施，有效保障了长裸眼固井质量。顺北区块长裸眼双级固井实施5口井，固井质量均达到良好及以上。Abstract: The Shunbei block in the Tarim Basin has complicated geologic conditions, and reservoirs are deep buried, usually over 7 500 m. Pyrolith in Permian leaks seriously. The Silurian formation has a poor pressure resistivity. The Upper Ordovician develops diabase intrusion body, and has a strong collapse stress. To optimize well structure, we used 193.7 mm casing down to the top of intrusion body, facing some difficulties such as deep setting depth (7 000 m) and cementing leakage. We improved cementing slurry column structure and centralizer design, added temperature-sensitive memory plugging material into light-weight cement slurry, optimized leakproof cementing technology, and injected light-weight cement slurry from well hole. In this way, the cementation of long open hole was optimized. This technique was applied and proved effective in 5 wells by two-stage cementation in Shunbei block.
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