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We studied the feasibility of potassium-based phosphate as a weighting agent for solid-free high-density test fluid, and optimized the formula of phosphate test fluid.Moreover, we evaluated its performance.The results show that potassium-based phosphate has the characteristics of moderate cost, wide sources, and large solubility, and the density can be adjusted to above 1.700 g·cm-3.According to the viscosity-enhancing effect and low-temperature rheology of potassium-based phosphate solution, potassium pyrophosphate with low viscosity effect is selected as the weighting agent of test fluid, and the formula of test fluid is optimized as follows: fresh water+0.15% chelating agent+0.15% cleanup additive+0.30% corrosion inhibitor, and the density can be adjusted between 1.000—1.820 g·cm-3.The solid-free high-density phosphate test fluid has a low crystallization point, low corrosion, and excellent reservoir protection performance, which can meet the test requirements of deep water/ultra-deep water high-temperature and high-pressure oil and gas reservoirs, and has broad application prospects.
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Basic Information:
China Classification Code:TE257.6
Citation Information:
[1]SUN Jingkang,WANG Runbo,LIANG Zhaojian ,et al.Formula Screening and Performance Evaluation on Solid-Free High-Density Phosphate Test Fluid for Deep Water[J].Chemistry ＆ Bioengineering,2026,43(07):66-70.
Fund Information:
国家重点研发计划项目(2022YFC2806503-4); 南海西部油田上产2 000万方钻完井关键技术研究项目(CNOOCKJ135ZDXM38ZJ05ZJ)
2025-09-17
2025-09-17
2025-09-17