同位素吸水剖面测井资料采集影响因素分析  

Analysis of influencing factors on logging data acquisition of isotope water injection profile

作　　者：李宁 吴新伟 万磊 温柔 邢帅 赵勃权 LI Ning;WU Xinwei;WAN Lei;WEN Rou;XING Shuai;ZHAO Boquan(Production Logging Center,CNPC China National Logging Corporation,Xi′an,Shaanxi 718500,China;No.3 Oil Production Plant,PetroChina Changqing Oilfield Company,Yinchuan,Ningxia 750000,China;Changqing Division of CNPC National Logging Corporation,Xi′an,Shaanxi 710200,China)

机构地区：[1]中国石油集团测井有限公司生产测井中心,陕西西安710200 [2]中国石油长庆油田分公司第三采油厂,宁夏银川750000 [3]中国石油集团测井有限公司长庆分公司,陕西西安710200

出　　处：《油气井测试》2019年第3期49-54,共6页Well Testing

基　　金：中国石油集团测井有限公司重大科研专项“油藏扫描测井关键技术研究”(F-D60018K201001)

摘　　要：在长期注水开发过程中,长庆油田区域地层低渗透层与大孔道地层共存,吸水剖面测井资料有效采集及解释困难,难以确定分层吸水量。从注水井井筒压力系统出发,分析水流过程中各阶段的压力损失及吸水层位的渗流特点,确定影响测井采集的敏感参数;从注水量调节和大孔道地层特点两方面对吸水剖面测井资料采集影响进行分析,选取合适粒径同位素。结果发现,注水层压差大,同位素迅速进层,造成测量失真;注水层压差小,同位素难以进入地层,造成井筒污染,使得采集到的资料与实际注水情况不符,油田水驱效果降低。合理的注水层压差可将同位素带入到储层位置,减小对储层的破坏,是成功测井与储层保护的关键。该分析能够提高吸水剖面测井解释成果的准确程度,揭示层间层内矛盾,评价水驱效果,为低渗透油田开发后期有效治理提供措施依据。During the process of the long-term water injection development,there was a phenomenon of coexisting of regional low-permeability reservoirs and large-pore reservoirs in Changqing Oilfield,which made it difficult to measure and interpret the water injection profile logging data.As a result,it was difficult to determine the amount of water absorbed by each sublayer.Based on the wellbore pressure system of the injection well,the pressure loss at each stage of the water flow process and the seepage characteristics of the water absorption layer were analyzed to determine the sensitive parameters affecting the logging acquisition.In addition,the influence of water injection volume adjustment and large pore formation characteristics on water injection profile logging data acquisition was analyzed and the appropriate size of isotopes was determined.The results show that when the pressure difference of water injection layer was large,the isotope would enter the layer quickly,which would cause the distortion of measurement;when the pressure difference of water injection layer was small,the isotope was difficult to enter the formation,and it would cause wellbore pollution,which made the collected data inconsistent with the actual water injection situation and lowered the effect of water injection.Therefore,the key to successful logging and reservoir protection was to bring isotopes into the reservoir position and reduce the damage to the reservoir by reasonable pressure difference of water injection formation.This analysis can improve the accuracy of log interpretation results of water injection profile,reveal intra-layer contradictions,evaluate water injection effect,and provide measures for effective treatment of low permeability oilfields in the later stage of development.

关 键 词：吸水剖面测井 低渗透层 大孔道 井筒压力 注水层压差 同位素粒径 测井解释 

分 类 号：TE33[石油与天然气工程—油气田开发工程]