超深水基岩潜山储层分布式光纤温度试井方法  

Distributed fiber optic temperature logging method for ultra-deep-water bedrock buried hill reservoirs

作　　者：梁豪 吴木旺 卢聪[2] LIANG Hao;WU Muwang;LU Cong(Exploration and Development Department of CNOOC-Hainan Ltd.,Haikou,Hainan 570312,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China)

机构地区：[1]中海石油(中国)有限公司海南分公司勘探开发部,海南海口570312 [2]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500

出　　处：《油气井测试》2024年第3期1-7,共7页Well Testing

基　　金：中国海洋石油有限公司重大科研项目“南海大中型天然气田形成条件、勘探潜力与突破方向”(KJZH-2021-0003-00)。

摘　　要：超深水永乐X区潜山气藏具有储层非均质强、纵向岩性组合多样的特征,传统生产测井技术在落实储层产出特征时存在局限性。采用分布式光纤测温技术测试获得了YL1井产能测试生产层段的温度数据,结合渗流力学和流体力学理论,建立了气藏渗流和井筒管流温度—压力场双耦合模型,计算了气井产出剖面变化引起的温度响应特征。采用Levenberg Marquart(LM)反演算法实现了YL1气井产出剖面定量解释分析。研究结果表明,气井多层测试时高渗层对应井筒温度下降斜率大,温度变化速度快,温降大,通过温度剖面可以作为判断高渗地层、裂缝或非产层产出贡献;利用建立的分布式光纤温度产出剖面解释方法,定量评价获得了砂砾质风化带、风化裂缝带和内幕裂缝带产出贡献,解释结果与录井气测率具有正相关性,且与地质认识吻合,证明了解释理论的可靠性。研究结果对分布式光纤温度监测多层气藏产出剖面技术的推广具有重要理论及应用价值。The buried hill gas reservoirs in the Yongle X block with ultra-deep water are characterized by strong heterogeneity and diverse vertical lithological combinations,posing limitations to traditional production logging techniques in characterizing reservoir production.By employing distributed fiber optic temperature logging technology,temperature data from the production intervals of well YL1 during productivity testing were acquired.Integrating flow mechanics and fluid dynamics theories,a dual coupled temperature-pressure field model for reservoir flow and wellbore flow was established,and the temperature response characteristics induced by changes in the gas well production profile were calculated.The production profile of well YL1 was quantitatively interpreted using the Levenberg Marquardt(LM)inversion algorithm.The research results show that,during multilayer well logging,high-permeability layers correspond to steeper temperature decline slopes in the wellbore,with faster and more significant temperature changes.Temperature profiles can thus be used to identify high-permeability formations,fractures,or non-productive layers.The production contributions of sandy gravel weathered zones,weathered fracture zones,and internal fracture zones were quantitatively evaluated using the established distributed fiber optic temperature production profile interpretation method.The interpretation results are positively correlated with gas logging measurements and are consistent with geological understanding,validating the reliability of the interpretation theory.This study holds significant theoretical and practical value for promoting distributed fiber optic temperature monitoring technology in multilayer gas reservoir production profiling.

关 键 词：超深水 基岩潜山 分布式光纤 温度试井 产出剖面 温度解释模型 潜山气藏 

分 类 号：TE353[石油与天然气工程—油气田开发工程]