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/cm^(3))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。
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/cm^(3))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.
作者
邹俊
郝少军
郝添
安小絮
唐正
ZOU Jun;HAO Shaojun;HAO Tian;AN Xiaoxu;TANG Zheng(Oil&Gas Process Research Institute,CNPC Qinghai Oilfield Branch,Dunhuang,Gansu 736202;Research Institute of Exploration and Development of PetroChina Qinghai Oilfield Company,Dunhuang,Gansu 736202)
出处
《钻井液与完井液》
北大核心
2025年第5期696-704,共9页
Drilling Fluid & Completion Fluid
基金
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)。
关键词
深井超深井
抗高温完井液
悬浮稳定剂
流变性能
储层保护
Deep and Ultra-deep Wells
High-temperature Completion Fluid
Suspension Stabilizer
Rheological Properties
Reservoir Protection.
