痕量化学示踪剂定量评价砾岩储层体积压裂改造效果  

Quantitative Evaluation on Volume Fracturing Effect of Conglomerate Reservoir Using Traces of Chemical Tracers

作　　者：郑爱萍 宋栋 覃遥 李宁 加玉锋 张万栋 Zheng Aiping;Song Dong;Qin Yao;Li Ning;Jia Yufeng;Zhang Wandong(Heavy Oil Development Company,PetroChina Xinjiang Oilfield Company;Karamay Chenguang Co.,Ltd.)

机构地区：[1]新疆油田公司重油开发公司,新疆维吾尔自治区克拉玛依市843000 [2]克拉玛依市晨光有限责任公司

出　　处：《石油机械》2024年第12期95-103,共9页China Petroleum Machinery

基　　金：中国石油天然气集团有限公司项目“砾岩油藏规模增储上产与提高采收率关键技术研究”(2023ZZ24);新疆油田分公司项目“火山岩油藏有效动用与提高采收率技术”(2024HSYC)。

摘　　要：水平井和大规模水力压裂组合技术是开发致密砾岩油藏的关键。良好的压裂改造效果对砾岩油藏的高产、稳产起到重要作用,然而砾岩储层压裂改造效果评价至今仍存在诸多问题。为此,使用理论分析和现场试验相结合的方式,基于痕量化学示踪剂定量评价了砾岩储层体积压裂改造效果,介绍了痕量化学示踪剂的技术原理和实施方案,归纳了示踪剂的产出曲线特征,围绕产出贡献、裂缝形态、井间干扰3个方面进行分析,并讨论了缝网形态诊断方面的问题。研究结果表明:痕量示踪剂产剖技术能够有效识别水平井各压裂段的静态与动态产出情况,监测的3个压裂段贡献了全部产油量的51%;测试井共有“宽多峰”“宽峰偏态”“尖峰偏态”“尖单峰”4种特征,8个监测段均表现为“宽多峰”,反映压裂段有多条裂缝,属于复杂的裂缝特征;示踪剂返排越早,裂缝的产出能力越强、渗透率越高;反之则代表裂缝导流能力较差、渗透率较低;利用示踪剂在不同井的产出量计算了产出率,从而量化了井间连通性的强弱。研究结果可为致密砾岩油藏压裂改造效果评价及高效开发提供重要的理论和现场指导。The horizontal well and extensive hydraulic fracturing combination technology is the key to developing tight conglomerate reservoirs.Good fracturing effect plays an important role in the high and stable production of conglomerate reservoirs.However,there are still many problems in evaluating the fracturing effect of conglomerate reservoirs.Therefore,based on traces of chemical tracers,the theoretical analysis and field test combination method were used to quantitatively evaluate the volume fracturing effect of conglomerate reservoirs.The technical principles and implementation plan of traces of chemical tracers were introduced,and the production curve characteristics of tracers were summarized.Analysis was conducted around three aspects:production contribution,fracture morphology,and interwell interference,and issues related to fracture network morphology diagnosis were discussed.The research results show that the production profile technology of traces of tracer can effectively identify the static and dynamic production of each fracturing section in horizontal wells,and the three monitored fracturing sections contribute 51%of the total oil production.The test well has four characteristics:“wide multiple peaks”,“wide peak skewness”,“peak skewness”and“single peak”.All eight monitoring sections show“wide multiple peaks”,reflecting the presence of multiple fractures in the fracturing section,which belong to complex fracture characteristics.The earlier the tracer flows back,the stronger the fracture production capacity,and the higher the permeability is.On the contrary,it represents poor fracture conductivity and low permeability.Finally,the production rate was calculated using the production of tracers in different wells,thus quantifying the strength of interwell connectivity.The research results provide important theoretical and field guidance for the fracturing effect evaluation and efficient development of tight conglomerate reservoirs.

关 键 词：砾岩储层 示踪剂 水力压裂 井间干扰 裂缝形状 产出贡献 改造效果 

分 类 号：TE357[石油与天然气工程—油气田开发工程]