基于分布式光纤测温的分段多簇压裂过程裂缝参数诊断方法  

Fracture parameter diagnostic method during staged multi-cluster fracturing based on distributed temperature sensing

作　　者：魏操 李海涛 祝效华 张楠 罗红文 屠坤 程时清[3] WEI Cao;LI Haitao;ZHU Xiaohua;ZHANG Nan;LUO Hongwen;TU Kun;CHENG Shiqing(School of Petroleum Engineering,Southwest Petroleum University,Chengdu 610500,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]西南石油大学石油与天然气工程学院,成都610500 [2]中国石油勘探开发研究院,北京100083 [3]中国石油大学(北京)石油工程学院,北京102249

出　　处：《石油勘探与开发》2025年第2期441-450,共10页Petroleum Exploration and Development

基　　金：国家重大装备研发项目课题(GJSCB-HFGDY-2024-004);国家自然科学基金青年基金(12402305);国家资助博士后研究人员计划(GZC20232200);博士后基金面上项目(2024M762703);四川省自然科学基金(2025ZNSFSC1352)。

摘　　要：选用Carter模型表征裂缝扩展和压裂液滤失动态行为,同时考虑压裂液在井筒、裂缝和油藏间的流动传热,建立水平井分段多簇压裂过程热-流耦合温度响应正演模型,分析压裂参数、裂缝参数对分布式光纤(DTS)温度响应的影响规律,提出基于模拟退火算法的裂缝参数诊断方法,并通过矿场实例应用验证模型可靠性。研究表明:多簇压裂过程中温度响应曲线具有“V形”典型特征,其位置与压裂裂缝对应;压裂液排量越大、压裂与停泵时间越长,“V形”深度越小;缝面滤失系数越大、压裂时间越长、裂缝宽度越小,“V形”宽度越大;压裂过程中短暂停泵阶段,近井筒周围低温仍向地层扩散,DTS温度不升反降;对DTS数据进行实时解释监测,可了解压裂过程中裂缝的扩展情况,便于及时采取相应措施,提高压裂效果。The Carter model is used to characterize the dynamic behaviors of fracture growth and fracturing fluid leakoff.A thermo-fluid coupling temperature response forward model is built considering the fluid flow and heat transfer in wellbore,fracture and reservoir.The influences of fracturing parameters and fracture parameters on the responses of distributed temperature sensing(DTS)are analyzed,and a diagnosis method of fracture parameters is presented based on the simulated annealing algorithm.A field case study is introduced to verify the model’s reliability.Typical V-shaped characteristics can be observed from the DTS responses in the multi-cluster fracturing process,with locations corresponding to the hydraulic fractures.The V-shape depth is shallower for a higher injection rate and longer fracturing and shut-in time.Also,the V-shape is wider for a higher fracture-surface leakoff coefficient,longer fracturing time and smaller fracture width.Additionally,the cooling effect near the wellbore continues to spread into the reservoir during the shut-in period,causing the DTS temperature to decrease instead of rise.Real-time monitoring and interpretation of DTS temperature data can help understand the fracture propagation during fracturing operation,so that immediate measures can be taken to improve the fracturing performance.

关 键 词：页岩油 水平井 分段多簇压裂 分布式光纤测温 热-流耦合模型 裂缝参数 实时监测 

分 类 号：TE332[石油与天然气工程—油气田开发工程]