抗高温高密度QH-HCF完井液体系

邹俊; 郝少军; 郝添; 安小絮; 唐正

doi:10.12358/j.issn.1001-5620.2025.05.017

抗高温高密度QH-HCF完井液体系

doi: 10.12358/j.issn.1001-5620.2025.05.017

1.
中国石油青海油田公司油气工艺研究院, 甘肃敦煌736202
2.
中国石油青海油田公司勘探开发研究院, 甘肃敦煌736202

基金项目: 中国石油天然气股份有限公司青海油田公司科技项目“柴达木盆地复杂深井安全钻完井配套技术研究”（2023KJ0701）。

详细信息

作者简介:
邹俊，硕士，现从事储层保护、钻完井技术和工作液优化相关工作。电话 15881129893；E-mail：swpu_zj@163.com

中图分类号: TE357.12
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- 被引次数: 0
出版历程
- 收稿日期: 2025-04-05
- 修回日期: 2025-05-18
- 刊出日期: 2025-09-30

Development of High-Temperature-Resistant and High-Density QH-HCF Completion Fluid System and Its Application in Deep and Ultra-Deep Wells

1.
Oil & Gas Process Research Institute, CNPC Qinghai Oilfield Branch, Dunhuang, Gansu 736202
2.
Research Institute of Exploration and Development of PetroChina Qinghai Oilfield Company, Dunhuang, Gansu 736202

摘要

摘要: 针对深井超深井钻完井作业中传统完井液体系在高温（>200℃）、高密度（>2.0 g/cm³）条件下存在的悬浮稳定性差、流变性恶化及储层损害等问题。通过分子设计研发了抗高温悬浮剂QH-HSA-III，并以此为核心构建了新型QH-HCF完井液体系。QH-HSA-III采用丙烯酰胺（AM）、十八烷基丙烯酸酯（ODA）和N-异丙基丙烯酰胺（NIPAM）三元共聚改性策略，通过疏水缔合与温敏响应机制，在高温下形成动态三维网络结构，显著提升了悬浮稳定性。实验结果表明，QH-HCF完井液体系在200℃下的表观黏度为60 mPa·s，动切力/塑性黏度比为0.26，高温沉降实验15 d后析水量仅为0.3%，岩屑滚动回收率达98.5%，粒径保留率为93.8%，且高温高压滤失量不大于15 mL。现场应用中，K2-X1井（井深为7182 m，井底温度为200℃）采用QH-HCF完井液体系后，循环压耗降低31.8%，铁屑返出率大于95%，非生产时间缩短了67%。研究证实，QH-HCF完井液体系兼具高温稳定性、动态流变调控能力和储层保护效果，为深井超深井安全高效开发提供了技术支撑。
- 深井超深井 /
- 抗高温完井液 /
- 悬浮稳定剂 /
- 流变性能 /
- 储层保护
Abstract: Addressing the poor suspension stability, rheological deterioration and reservoir damage exhibited by conventional completion fluids in deep and ultra-deep well drilling and completion operations under high-temperature (>200℃) and high-density (>2.0 g/cm³) conditions, this study employs molecular design to develop a high-temperature suspending agent, QH-HSA-III, and uses it as the core to build a novel QH-HCF completion fluid system. QH-HSA-III is synthesized via a terpolymer modification strategy of acrylamide (AM), octadecyl acrylate (ODA) and N-isopropylacrylamide (NIPAM). Through hydrophobic association and thermoresponsive mechanisms, it forms a dynamic three-dimensional network at elevated temperatures, markedly enhancing suspension stability. Laboratory evaluations show that the QH-HCF system maintains an apparent viscosity of 60 mPa·s at 200℃ with a dynamic shear force to plastic viscosity ratio of 0.26. In a 15-day high-temperature settling test, water separation was only 0.3%, cuttings rolling recovery reached 98.5%, particle-size retention was 93.8%, and high-temperature/high-pressure filtration loss remained ≤ 15 mL. In field trials on Well K2-X1 (measured depth 7182 m, bottom-hole temperature 200℃), application of the QH-HCF system reduced circulating pressure loss by 31.8%, achieved a cuttings return rate in excess of 95%, and cut non-productive time by 67%.These results confirm that the QH-HCF completion fluid system delivers outstanding high-temperature stability, dynamic rheological control and reservoir protection, providing robust technical support for the safe and efficient development of deep and ultra-deep wells.
- Deep and Ultra-deep Wells /
- High-temperature Completion Fluid /
- Suspension Stabilizer /
- Rheological Properties /
- Reservoir Protection.

HTML全文

图 1 不同温区下完井液流体的性能

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图 2 完井液流体静切力性能分析

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图 3 加入2%QH-HSA-III前后完井液（2.1 g/cm³）简易配方近红外沉降稳定分析仪测试结果

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图 4 高温条件下岩屑滚动实验分析

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图 5 不同实验组下岩屑粒径分布测试分析

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图 6 现场完井液高温老化实验分析

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