注入水水质监测数据的统计分析  

A Statistical Analysis of Injection Water Quality Monitoring Data

作　　者：郭鹏[1] 冯恩山[1] 徐惠[1] 

机构地区：[1]中国石化江苏油田分公司试采一厂

出　　处：《油田化学》2002年第2期147-149,153,共4页Oilfield Chemistry

摘　　要：在注入水水质评价中通常采用的项目达标率和总达标率 ,不能反映水质各监测项目的测定值与标准控制值的差距。为此引入了水质指数S的概念。水质指数为各监测项目的检测值与标准控制值之比的加和 ,该指数值越小 ,则水质越好。当加和包括全部n个监测项目时 ,称为全项目水质指数或水质总指数 ,记为Sn。考虑到江苏油田试采一厂的情况 ,n取为 7,包括主项目 4个 (pH值 ,含量 ,SRB和TGB菌数 ) ,主项目水质指数记为Sn′,辅助项目 3个 (游离CO2 、硫化物、总铁含量 )。又引入了将其中任意一个项目排除在外的水质指数Sn -1(i) ,i代表除外项目。Sn 与Sn′之差 ,特别是Sn 与Sn -1(i)之差 ,表示该除外项目对水质的影响程度。利用各个S值对比了试采一厂各地区、区块注入水的水质及近几年水质的变化并作了分析讨论。例如影响富民地区水质的首要项目是总铁含量 ,含油量和游离CO2 含量也是主要项目 ,由此得出腐蚀是最重要的问题。简述了提高各地区。The commonly used criteria for injection water quality (IWQ) - qualification rate by item and in general do not give the differences between the determined values and the limits specified in the trade Standard for the items of water quality analysis (WQA). A concept of water quality indexes is suggested. A water quality index, S, is defined as the summation of the quotient of the determined value divided by the specified limit for every item of WQA taken into consideration and the lower the S value the better the IWQ is. In the case of the 1st Factory of Jiangsu 7 or 6 items are selected for water quality monitoring, of these 4 main items (pH value, oil content, population of bacteria SRB and TGB) and 3 additional ones (contents of free CO 2, sulfide, and total iron ions). Following IWQ indexes are obtained: overall index S n when all 7 or 6 items of WQA are taken into account; main intem index S n′ when main items of WQA are considered only; and index s n-1(i) when item i is excluded in summation. The differences between S n and S n′ and ,particularly, between S n and S n-1(i) express the influencing power of item i on IWQ. By using these S values the IWQ in various districts and blocks of Jiangsu and the changes in IWQ in recent years are analysed and discussed comparatively. For example, in district FM the IWQ is affected mainly by total Fe ions content and notably by oil and free CO 2 contents and corrosion appears to be the most important problem. The measures to be undertaken in various districts and blocks for improving IWQ are presented concisely.

关 键 词：注入水 水质监测 数据处理 统计分析 水质指数 江苏油田 

分 类 号：TE357.8[石油与天然气工程—油气田开发工程]