现场气测异常出现二次循环气现象的探讨  

Discussion about the anomaly of occurring secondary circulation gas during on-site gas logging.

作　　者：杨亮[1] 董继承[1] 柳绿[1] 段长军[1] 吴文宽[1] 

机构地区：[1]大庆钻探工程公司录井二公司

出　　处：《录井工程》2009年第2期59-60,65,共3页Mud Logging Engineering

摘　　要：气测录井过程中出现的二次循环气易造成气测假异常,这种假异常往往会掩盖地层真实的油气水显示,也给现场油气水层的解释评价带来困难。因此,能够在现场准确区分出这些特殊现象造成的假异常,对于准确识别真实的油气显示有着重要的作用。通过Y 60井二次循环气现象的剖析,提出了识别二次循环气的方法,并通过接单根后效、二次峰(2号罐)入口全脱组分与出口全脱组分参数分析比较,进一步说明了气测异常时钻并液含有的气体在地面没有全部除去,致使钻井中的烃类气体二次入井,形成二次循环气的过程,有助于现场录井识别二次循环气,消除对真实油气显示的影响,提高气测解释符合率。The secondary circulation gas occurring during gas logging easily results in gas logging false anomaly,which often covers up the real formation water-oil-gas shows,and brings difficulties to on-site water-oil-gas layers interpretation and evaluation.So,to correctly distinguish these onsite false anomaly caused by the special phenomena has important functions for accurately identifying the real oil and gas shows.Through analyzing secondary circulation gas phenomenon of Well Y60,the paper introduced the methods of identifying secondary circulation gas,and by making analysis and comparison between gas analysis data of the connection aftereffect and the data of the inlet and outlet totally degassed gas parameters for secondary peak(No.2 tank),it further illuminated the gases in drilling fluid during gas logging anomaly couldn't be entirely eliminated,and it resulted in the drilling hydrocarbon gases secondary entering into borehole,thus forming the secondary circulation gas.The introduction made a contribution to on-site mud logging identifying secondary circulation gas,eliminating the effects on true oil-gas shows and enhancing gas logging coincidence rate.

关 键 词：气测录井 二次循环气 真假异常 识别方法 

分 类 号：TE142[石油与天然气工程—油气勘探] TQ113.251[化学工程—无机化工]