Laboratory Research on 0.9 g/cm3 Ultra-Low Density Cement Slurry
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摘要: 通过分析固井施工对超低密度水泥浆的要求，针对现阶段超低密度水泥浆面临的挑战，优选使用C级水泥和降失水剂C-FL712L，以及高性能增强材料C-BT5得到了一种超低密度水泥浆，并对该水泥浆的综合性能进行评价。评价结果表明，构建的0.9～1.1 g/cm3超低密度水泥浆综合性能良好，浆体稳定性高、上下密度差可控制在0.05 g/cm3以内，稠化时间可调，60℃抗压强度达到7 MPa以上，静胶凝强度发展较快，有较好的防气窜功能，适用的压力范围大，满足固井工程应用要求，可以在低压易漏油藏及超长封固段井的固井施工中推广应用。
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关键词:
Abstract: Well cementing with low-density cement slurries is faced with many challenges. By analyzing the requirements of cementing wells with ultra-low formation pressures, an ultra-low density cement slurry was formulated with class C cement, a filter loss reducer C-FL712L and a high performance strengthening material BT5. Laboratory test showed that the cement slurry, with density being adjustable between 0.9 g/cm3 and 1.1 g/cm3, has good overall performance. The slurry has good stability, the density difference between the top and the bottom of a slurry column can be controlled within 0.05 g/cm3. The thickening time of the cement slurry is adjustable. The compressive strength of the set cement at 60℃ can be 7 MPa or higher. The gel strengths of the cement slurry develop fast, and is beneficial to the prevention of gas-channeling. This cement slurry can be used in a wide range of pressures and satisfy the needs of cementing reservoirs and ultra-long sections with low pressures in which mud losses are frequently encountered. -
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