利用改进地层系数法预测苏X区块气井产能  

Prediction of gas well productivity in block Su X by improved formation coefficient method

作　　者：邓东东 王玉善 高磊 李国良 房金伟 张洁 DENG Dongdong;WANG Yushan;GAO Lei;LI Guoliang;FANG Jinwei;ZHANG Jie(Oil&Gas Cooperation and Development Company,CNPC Bohai Drilling Engineering Company,Tianjin 300457,China)

机构地区：[1]中国石油集团渤海钻探工程有限公司油气合作开发分公司,天津300457

出　　处：《油气井测试》2021年第3期1-6,共6页Well Testing

基　　金：渤海钻探工程有限公司重大科技专项“苏里格合作区块地质深化研究”子课题“苏里格合作区块低品质储量区分级评价及开发部署”(2020ZD09F-02)。

摘　　要：苏里格气田预测气井产能的方法未考虑高含水饱和度对气井产能的影响,导致产能预测结果偏差大。以气井产能方程为基础,研究影响产能因素,综合分析各参数判断影响未压裂投产井产能的主要因素为地层系数,为减小束缚水饱和度和残余气饱和度对储层评价的影响,提出改进地层系数法预测产能。该方法选用pirson相对渗透率模型,利用实验数据确定模型经验参数,求取归一化相对渗透率,结合有效气层厚度,得到基于归一化相对渗透率的改进地层系数M,建立M预测产能模型。经苏X区块苏X-20-9X井及苏X-11-22X井进行验证,利用改进的地层系数法预测的无阻流量与试气无阻流量符合率在82%以上,符合气井的实际生产规律。该方法所需参数少且易获取,在苏X区块具有很好的使用价值。The method of predicting gas well productivity in Sulige gas field does not consider the influence of high-water saturation on gas well productivity,resulting in large deviation of productivity prediction results.Based on the productivity equation of gas well,the factors affecting productivity are studied.By comprehensive analysis of various parameters,it is judged that the main factor affecting the productivity of unfractured wells is formation coefficient.In order to reduce the influence of irreducible water saturation and residual gas saturation on reservoir evaluation,the improved formation coefficient method is proposed to predict productivity.In this method,the Pearson relative permeability model is selected,the empirical parameters of the model are determined by using the experimental data,and the normalized relative permeability is calculated.Combined with the effective gas reservoir thickness,the improved formation coefficient m based on the normalized relative permeability is obtained,and the M prediction productivity model is established.Verified by well Su X-20-9X and well Su X-11-22X in Su X block,the coincidence rate between the predicted open flow rate and the gas testing open flow rate by using the improved formation coefficient method is more than 82%,which is in line with the actual production law of gas wells.This method needs few parameters and is easy to obtain,so it has good application value in Su X block.

关 键 词：低渗透气井 产能影响因素 未压裂 相对渗透率 地层系数 束缚水 残余气 产能预测 

分 类 号：TE353[石油与天然气工程—油气田开发工程]