基于DTS的注水井吸水剖面解释方法  

Method to Interpret Injection Profile of Water Injection Well Based on DTS

作　　者：张玺亮 李昂 吴杰 王利军 左凯 张志虎 ZHANG Xiliang;LI Ang;WU Jie;WANG Lijun;ZUO Kai;ZHANG Zhihu(Engineering Technology Branch,CNOOC Energy Development CO.LTD.,Tianjin 300452,China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300452

出　　处：《测井技术》2024年第4期537-547,共11页Well Logging Technology

基　　金：中海油能源发展股份有限公司重大科技专项“智能注采系列产品研制及产业化应用(I期)”(HFKJ-ZX-GJ-2022-01-04)。

摘　　要：针对注水井分层注水量诊断技术难题,提出基于分布式光纤温度传感(Distributed Temperature Sensing,DTS)的注水井吸水剖面解释方法。建立考虑微量热效应的注水井温度剖面预测模型,模拟分析注水量、注水时间、储层导热系数等7个因素对温度剖面的影响规律。通过正交试验模拟分析,确定不同因素对注水井温度剖面的影响程度从强到弱分别为注入水温度、注水时间、注水量、井筒半径、储层导热系数、井筒倾斜角度、注水层渗透率,明确影响注水井温度剖面的主控因素为注入水温度、注水时间和注入量。采用模拟退火(Simulated Annealing,SA)算法建立注水井DTS数据反演模型,对一口注水井现场实测DTS数据进行反演,获得较为准确的吸水剖面,单层最大吸水量误差百分比14.25%,平均误差11.09%,验证该反演方法的可靠性。通过DTS数据反演可以实现注水井吸水剖面定量解释,为注水效果评价提供直接依据。A method for interpreting the water injection profile based on Distributed Temperature Sensing(DTS)is proposed to address the technical challenges of diagnosing the water injection volume of each injection layer of water injection wells.Firstly,a temperature profile prediction model for water injection wells is established with considering the micro thermal effects.The influence of seven factors including water injection rate,water injection time,formation thermal conductivity etc.on the temperature profile is simulated and analyzed.Through orthogonal experiment analysis,it demonstrates that the sensitivity of temperature profile on different factors from strong to weak is water injection temperature,water injection time,water injection rate,wellbore radius,formation thermal conductivity,wellbore trajectory,formation permeability.Water injection temperature,water injection time,and water injection rate are the dominant parameters impacting the temperature profile of water injection wells.A simulated annealing(SA)algorithm is used to establish a DTS data inversion model for water injection wells.Using the inversion model,the DTS data of a field water injection well has been inverted and accurate water injection profile is obtained.The maximum inversion error of water absorption percentage of each layer is 14.25%and the average inversion error of water absorption percentage for all layers is 11.09%that validates the reliability of the inversion method in this paper.It can be seen that quantitative interpretation of water injection profiles can be achieved through DTS data inversion.It provides a direct basis for evaluating water injection effectiveness.

关 键 词：吸水剖面 DTS 反演模型 注水井 SA算法 温度剖面敏感性 

分 类 号：P631.84[天文地球—地质矿产勘探]