基于流管模型的裂缝性低渗透油藏井间示踪剂解释模型
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摘要
裂缝性低渗透油藏的示踪剂产出曲线与常规储层不同,存在多个峰值,需要建立针对裂缝性油藏的示踪剂解释模型。将该类储层中的裂缝系统考虑为多条裂缝条带,并将裂缝条带等效为流管束,建立示踪剂在井间流动的物理模型。基于一维对流扩散方程,沿着流管建立了示踪剂浓度分布数学模型,在生产层将各裂缝条带的浓度叠加后,得到示踪剂浓度产出表达式。敏感性分析表明,随着裂缝条带等效流管数增加,浓度产出曲线峰值下降;随着流管长度增加,生产井见剂时间增长,且峰值浓度降低;随着渗透率和注采压差增大,生产井见剂时间减小,浓度产出曲线带宽增加。现场应用表明,该模型的解释结果与数值模拟解释结果相近,验证了模型的合理性。
Due to the strong heterogeneity,the tracer production curve of fractured reservoirs low-permeability has multiple peaks,which is different from that of conventional reservoir.So,it cannot accurately describe the information of fractures.Therefore,it is urgently to establish a tracer interpretation model for fractured reservoirs.In this paper,the fracture system of reservoir is considered to be composed of many fracture belts,and the fracture belt is equivalent to the stream tube.Based on above assumptions,the physical model of inter-well tracer flow is established.Moreover,a mathematical model of the tracer concentration distribution along the stream tube is built according to the one-dimensional convection-diffusion equation.After the concentration of each fracture belt is superimposed in the production layer,the tracer concentration production expression is obtained.Sensitivity analysis shows that as the number of equivalent stream tubes increases,the peak value of the concentration production curve decreases;as the length of flow tubes increases,the tracer breakthrough time increases,and the peak concentration decreases;as the permeability and pressure difference between injection and production well increase,the breakthrough time decreases,and the bandwidth of concentration production curve increases.The field application shows that the results of this model are close to the numerical simulation interpretation result,which validates the rationality of the model.
Due to the strong heterogeneity,the tracer production curve of fractured reservoirs low-permeability has multiple peaks,which is different from that of conventional reservoir.So,it cannot accurately describe the information of fractures.Therefore,it is urgently to establish a tracer interpretation model for fractured reservoirs.In this paper,the fracture system of reservoir is considered to be composed of many fracture belts,and the fracture belt is equivalent to the stream tube.Based on above assumptions,the physical model of inter-well tracer flow is established.Moreover,a mathematical model of the tracer concentration distribution along the stream tube is built according to the one-dimensional convection-diffusion equation.After the concentration of each fracture belt is superimposed in the production layer,the tracer concentration production expression is obtained.Sensitivity analysis shows that as the number of equivalent stream tubes increases,the peak value of the concentration production curve decreases;as the length of flow tubes increases,the tracer breakthrough time increases,and the peak concentration decreases;as the permeability and pressure difference between injection and production well increase,the breakthrough time decreases,and the bandwidth of concentration production curve increases.The field application shows that the results of this model are close to the numerical simulation interpretation result,which validates the rationality of the model.
引文
[1]谢佳析,刘喆,程柏青,等.井间示踪技术在砂岩及碳酸岩缝洞型油藏的应用研究[J].测井技术,2008,32(3):272-276.
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[4]赵政嘉,顾玉洁,才博,等.示踪剂在分段体积压裂水平井产能评价中的应用[J].石油钻采工艺,2011,18(1):74-84.
[5]张钊,陈明强,高永利,等.应用示踪技术评价低渗透油藏油水井间连通关系[J].西安石油大学学报(自然科学版),2006,21(3):48-52.
[6]牛栓文,赵晓燕,俞萍,等.分层示踪剂测试技术在合采合注油藏开发中的应用[J].测井技术,2005,29(4):376-378.
[7]郭宝玺,王秀琴,王喜梅,等.井间示踪监测确定水驱油藏剩余油饱和度技术应用[J].测井技术,2005,29(3):240-243.
[8]金成志.水平井分段改造示踪剂监测产量评价技术及应用[J].油气井测试,2015,24(4):38-42.
[9]蒲春生,景成,何延龙,等.裂缝性特低渗透油藏水窜水淹逐级调控多级井间化学示踪技术[J].石油勘探与开发,2016,43(4):621-629.
[10]景成,蒲春生,何延龙,等.裂缝性特低渗油藏井间示踪剂监测等效抛物型解释模型[J].石油勘探与开发,2016,35(6):73-82.
[11]景成,蒲春生,何延龙,等.单一裂缝条带示踪剂产出模型及其参数敏感性分析[J].测井技术,2016,40(4):408-412.
[12]景成,蒲春生,谷潇雨,等.裂缝性特低渗油藏井间化学示踪监测分类解释模型[J].石油钻采工艺,2016,38(2):226-231.
[13]查峰.井组示踪剂产出曲线解释方法研究[D].青岛:中国石油大学(华东),2010.
[14]杨艳,王业飞,郑家朋,等.管流模型概算法识别大孔道[J].断块油气田,2013,20(2):213-215.
[15]秦积舜,李爱芬.油层物理学[M].东营:中国石油大学出版社,2003.
非法定计量单位,1mD=9.87×10-4μm2,下同
[2]张毅,姜瑞忠.井间示踪剂分析技术[J].石油大学学报(自然科学版),2001,25(2):76-78.
[3]郝明强,胡永乐,刘先贵,等.裂缝性低渗透油藏特征综述[J].特种油气藏,2007,14(3):12-15.
[4]赵政嘉,顾玉洁,才博,等.示踪剂在分段体积压裂水平井产能评价中的应用[J].石油钻采工艺,2011,18(1):74-84.
[5]张钊,陈明强,高永利,等.应用示踪技术评价低渗透油藏油水井间连通关系[J].西安石油大学学报(自然科学版),2006,21(3):48-52.
[6]牛栓文,赵晓燕,俞萍,等.分层示踪剂测试技术在合采合注油藏开发中的应用[J].测井技术,2005,29(4):376-378.
[7]郭宝玺,王秀琴,王喜梅,等.井间示踪监测确定水驱油藏剩余油饱和度技术应用[J].测井技术,2005,29(3):240-243.
[8]金成志.水平井分段改造示踪剂监测产量评价技术及应用[J].油气井测试,2015,24(4):38-42.
[9]蒲春生,景成,何延龙,等.裂缝性特低渗透油藏水窜水淹逐级调控多级井间化学示踪技术[J].石油勘探与开发,2016,43(4):621-629.
[10]景成,蒲春生,何延龙,等.裂缝性特低渗油藏井间示踪剂监测等效抛物型解释模型[J].石油勘探与开发,2016,35(6):73-82.
[11]景成,蒲春生,何延龙,等.单一裂缝条带示踪剂产出模型及其参数敏感性分析[J].测井技术,2016,40(4):408-412.
[12]景成,蒲春生,谷潇雨,等.裂缝性特低渗油藏井间化学示踪监测分类解释模型[J].石油钻采工艺,2016,38(2):226-231.
[13]查峰.井组示踪剂产出曲线解释方法研究[D].青岛:中国石油大学(华东),2010.
[14]杨艳,王业飞,郑家朋,等.管流模型概算法识别大孔道[J].断块油气田,2013,20(2):213-215.
[15]秦积舜,李爱芬.油层物理学[M].东营:中国石油大学出版社,2003.
非法定计量单位,1mD=9.87×10-4μm2,下同