示踪剂技术在营八断块的应用

A Case of Using Water Soluble Tracer to Investigate Interwell Connectivity at Fault Block Y8

在东辛油田营 8断块Y12 14 6井组采用示踪剂技术检测了注水井Y12 14 6与相邻采油井之间的连通情况。所选示踪剂为NH4 NO3,水样中加入对氨基苯磺酸后以α 萘胺显色 ,在 70℃ (地层温度 )下用分光光度法测定试液吸光度 ,利用工作曲线或线性拟合公式求得NO-3浓度。按Brigham Smith公式计算出硝酸铵用量为 10 .15t,实际注入量为 30t。在相邻 7口油井中检出了NO-3(另有 3口井关井 ,未取样检测 )。列出了 7口油井的地层参数 ,生产层位 ,与注水井距离 ,NO-3峰值出现时间和延续时间 ,高峰浓度 ,产出NO-3的相对量 ,各小层的厚度、渗透率及孔道半径 ,给出了 5口油井示踪剂产出曲线和利用一种软件拟合的曲线。注水井Y12 14 6与同层位的 4口井连通性良好 ,与分属其他两个层位的 3口井之间有层间窜流现象 ,且比较严重 ,从这 3口井产出的示踪剂量占总产出量的 2 6 .5 %。图 6表 3参 3。

The connectivity between water injection well Y12 146 and neighboring production wells at Y12 146 well group of fault block Y8 at Dongxing oil fields, Shengli, by flooding water tracing method. The tracer selected is ammonium nitrate and its quantitative analysis is conducted through reduction by p aminophenyl sulfonic acid, color developing by α naphtylamine, spectrometric measurement of solution absorbance and determination of NO - 3 concentration on the working graphic constructed or by using the linear relationship fitted. The nitrate need calculated by using Brigham Smith equation is of 10.15 t and the amount injected - of 30 t. NO - 3 is detected in produced wtaer of 7 neighboring production wells (another 3 neighboring wells closed).Following data determinated and calculated are presented: reservoir characteristics, pay layers, distance from well Y12 146, the starting data and duration of NO - 3 production, NO - 3 peak concentration, relative produced NO - 3 amount, the thickness, permeability, and pore radium of every sublayers for 7 wells and real and fitted tracer production curves for 5 of 7 wells. The water injection well Y12 146 is well connected with 4 production wells with the same pay layers as in well Y12 146; there exist severe interlayer channellings between well Y12 146 and other 3 production wells with different 2 sets of pay layers, the laters have produced 26.5% of the nitrate produced.