Abstract: This paper focuses on the core additives, such as the independently-developed soluble weighting agent and high-effective antisalt cleaning agent. Based on formula research, solid-free spacer BH-HDP was developed with its performance evaluated. The experiment results indicated that the density of spacer is adjustable at between 1. 00 and 1. 80 g/ cm3. The positive and negative error of the density is zero under the condition of 180℃, showing a good anti-temperature property. The spacer is the Newtonian fluid and easy to bring about turbulent flow replacement. The flushing efficiency for false filter cakes in the drilling fluid exceeds 90 percent. When drilling fluid, mud and spacer are mixed according to the different proportions, the liquidity index value is increased while the thickening coefficient value is reduced and the thickening time extended with a good compatibility. When used for cementing in Iraq’ s high-pressure salt gypsum formations, the solid-free cleaning-type spacer BH-HDP could effectively isolate drilling fluid and mud, improving the replacement efficiency, cleaning false filter cakes and raising the cementing quality. It has been used on the field for 121 well times, generating a turnover of 212. 5636 million yuan and US＄30. 3662 million from exports.

Key words: solid-free, cleaning, spacer, cementing, stability, rheological property

摘要： 基于自主研发的可溶性加重剂、高效抗盐清洗剂等核心外加剂, 通过配方研究开发了无固相隔离液BHHDF 并进行了性能评价。试验结果表明: 隔离液密度在1. 00~1. 80g/ cm3 之间可调; 在180℃条件下养护后上下密度差 为0, 具有良好的抗温性能; 为牛顿流体, 易实现紊流顶替; 对钻井液虚泥饼的冲洗效率可达到90%以上; 钻井液、水 泥浆与隔离液以不同比例混合后, 流性指数值增加, 稠度系数值降低, 稠化时间延长, 相容性好。无固相清洗型隔离 液BH-HDF 在伊拉克哈法亚、米桑高压盐膏层固井应用过程中, 能有效隔离钻井液与水泥浆, 提高顶替效率, 清除虚 泥饼, 改善固井质量。现场应用121 井次, 创收21256. 36 万元, 出口创汇3036. 62 万美元。

关键词: 无固相; 清洗; 隔离液; 固井; 稳定性; 流变性