Offshore Gas Hydrate Completion Fluid System Construction and Performance Evaluation
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摘要: 砾石充填防砂方式是解决水合物储层开采出砂的有效手段，但与之配套的完井液体系面临水合物二次生成和砾石充填效率不高等技术难题。结合南海常规油气藏开发完井经验，考虑水合物储层的特殊性，构建了不同水合物完井液体系，评价了体系性能。研究结果表明，常用的热力学抑制剂乙二醇和盐类需要比较高的添加量才能达到比较好的抑制效果，但较高的完井液密度无法满足现场施工要求，需要替代使用动力学抑制剂；使用自行研发的SYZ-2动力学抑制剂配制的完井液体系能够满足现场各项指标要求，取得比较好的完井效果。优选出完井液配方为：盐水 + 2.5% PF-HCS + 2.0% PF-CA101HT + 6.5% NaCl + 1.0% SYZ-2。Abstract: Gravel packing is an effective method for preventing sand production during the exploitation of gas hydrate reservoirs. However, the accompanying completion fluid system faces technical challenges, such as secondary hydrate formation and low gravel packing efficiency. Therefore, this paper combines the experience of conventional oil and gas reservoir development in the South China Sea, considers the particularity of gas hydrate reservoirs, constructs different gas hydrate completion fluid systems, and evaluates the complete performance of these systems based on laboratory experiments and numerical simulation techniques. The research results show that commonly used thermodynamic inhibitors such as ethylene glycol and salts require relatively high addition amounts to achieve good inhibition effects, but the higher completion fluid density cannot meet the on-site construction requirements, so kinetic inhibitors need to be used as substitutes. The experimental tests and numerical simulation results show that the completion fluid system formulated with the self-developed SYZ-2 kinetic inhibitor can meet the requirements of various on-site indicators and achieve good completion effects. After comparative analysis, the optimal completion fluid is brine+2.5%PF-HCS+2.0%PF-CA101HT+6.5%NaCl+ 1.0%SYZ-2.
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Key words:
- Gas hydrate /
- Well-completion /
- Gravel filling /
- Inhibitor
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表 1 不同配方完井液与清水、盐水的腐蚀速率
完井液 钢片
编号腐蚀前
质量/g腐蚀后
质量/g腐蚀速率/
mm·a−1清水 1 10.8472 10.8463 0.052 盐水 2 10.8021 10.8004 0.065 1#配方 3 10.9265 10.9257 0.037 2#配方 4 10.0212 10.0205 0.028 3#配方 5 10.8964 10.8957 0.035 4#配方 6 10.7692 10.7684 0.036 
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表 2 添加NaCl后的3#配方完井液密度和流变性能
配方 NaCl/
%ρ/
g·cm−3AV/
mPa·sPV/
mPa·sYP/
Pa3-1# 7.5 1.05 1.0 1 0 3-2# 7.0 1.05 1.0 1 0 3-3# 7.0 1.06 3.5 3 0.5 3-4# 6.5 1.06 1.5 1 0.2
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