Application of Big Differential Temperature Low Density Cement Slurry in Well NP36-3804
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摘要: NP36-3804 井是新堡古2 平台的一口开发井,钻井液密度为1.35 g/cm3,完钻井深为4 714 m,要求水泥浆一次性封固至地面,对水泥浆的稳定性和温度敏感性提出了更高的要求。通过实验,优选BXE-600S 作减轻剂,其是一种根据颗粒级配理论配制的具有水化活性的水泥外掺料;用BCJ-310S 作悬浮剂,其由无机材料与有机材料复合得到,其对混灰影响小;用AMPS 多元共聚物BCG-200L 防气窜剂,优选了耐高温、温度加量敏感性小、性能稳定的大温差缓凝剂BCR-260L,开发并使用了1.35 和1.50 g/cm3 的高强度低密度水泥浆体系。实践表明,该水泥浆体系流变性好,无游离液,密度差控制在0.03 g/cm3,API 失水量在50 mL 以内,稠化时间均满足施工要求,具有低温早强和水泥石抗压强度高等性能,能够满足封固生产套管的抗压强度要求。Abstract: In the Well NP-36-3804 drilled in the Xinpu Gu-2 platform, 4,714 m of production casing was required to be cemented in on cementing operation. Conventional cement slurry was unable to meet the requirement of cementing such a long casing string because of low slurry density and big differential temperature. Success of the cementing job required the low density cement slurry to have lower density, to be less affected by temperature difference, and to become set more quickly at normal temperatures. Two high density low density cement slurries, having densities of 1.35 g/cm3 and 1.50 g/cm3 respectively, were formulated by selecting competent lightweight materials, developing high performance anti-gas migration agent, and selecting the best close packing calculation model. It was found in field application that the two slurries had no free water. The cement slurries were stable and had good rheology at operational conditions. API filter loss and thickening performance all met the requirement of field application. The low temperature early strength and the compressive strength of set cement were all satisfactory.
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