塔里木盆地克依构造带固研究与实践

塔里木盆地克依构造带的高压油气层、高压水层、盐水层、盐膏层、盐岩层以及复合盐层等给固井施工造成很大的困难。通过地高密度水泥浆、高密度隔离液及固井工艺的研究，选出了适合于含盐地层和不含盐地层的2个温度范围下2种密度的水泥浆配方，高密度隔离液的加重方法，现场施工中的平衡压力固井工艺、配浆工艺、替浆工艺、候凝及井控措施、防卡措施。经现场20多口井应用表明，这2种高密度水泥浆体系及固井工艺技术解决了地层压力高、地层蠕变性强、封固井段温差大、地层岩性多变、同时封固油气水及盐膏层等问题。固井合格率为100％，其中在克拉苏区块的井，完井测试均获高产天然气，气水层封隔效果良好。

Cementing in Kelasu-Yiqikelik structural belt in Tarim Basin

Troublesome zones such as high pressure water and saltwater layer, salt/cream bed, salt rock bedding and recombination rocks bedding in Kelasu-Yiqikelik structural belt in Tarim basin complicate cementing operation. Two compositions with different density for two temperature ranges are optimized to cement in salt and non-salt zones. High density spacer fluid weighting method and cementing technology including slurry preparing, displacing and waiting-on-ce-menting are also designed. Applications in more than 20 wells show success, and cementing qualification rates reach 100%. Especially in Kelasu block, isolations of gas-water formation are very good.