一种修正气藏废弃压力的新方法  

A new method for correcting the abandonment pressure of gas reservoirs

作　　者：刘军 郭培培 何春百 王振杰 武静 潘杰 LIU Jun;GUO Peipei;HE Chunbai;WANG Zhenjie;WU Jing;PAN Jie(CNOOC International Limited,Beijing,100028,China;Pengbo Operating Company,CNOOC(China)Co.,Ltd.,Tianjin 300457,China)

机构地区：[1]中国海洋石油国际有限公司,北京100028 [2]中海石油(中国)有限公司蓬勃作业公司,天津300457

出　　处：《石油地质与工程》2024年第3期90-94,共5页Petroleum Geology and Engineering

摘　　要：气藏产能测试的产量数据和压力数据受钻完井污染、储层打开及射孔密度不完善和非达西流等因素影响,存在不同程度的偏差,导致传统二项式法计算得到的层流(达西流)系数A和紊流项(非达西流)系数B出现负值或回归系数较差。在前人成果的基础上,采用规划求解的方式优化附加压力降计算值,使二项式法回归系数更接近1,进一步提升准确性;通过引入表征真实表皮系数下的附加压力降和非达西流动造成的附加压力降之间的比例系数m,得出任意生产时刻的总表皮附加压力降;并根据现场工程设施和经济评价的极限产量计算出修正后的废弃压力。以国外H气田的产能试井数据为例,利用该方法获得修正废弃压力,并重新计算采收率,结果与气田实际论证的值更为接近,为后续气田评价及开发过程中计算相关参数提升可靠性。The production and pressure data of gas reservoir productivity test are affected by pollution of drilling and completion,reservoir opening,imperfect perforation density and non-Darcy flow,etc.,and there are different degrees of deviation,which leads to negative or different regression coefficients of laminar flow(Darcy flow)coefficient A and turbulent flow term(non-Darcy flow)coefficient B calculated by traditional binomial method.In this paper,the method of programming solution is adopted to optimize the calculated value of additional pressure drop on the basis of predecessors,which can make the regression coefficient of binomial method closer to 1 and further improve the accuracy.The total skin additional pressure drop at any time of production is obtained by introducing the proportional coefficient m,which represents the additional pressure drop between the real skin coefficient and the additional pressure drop caused by non-Darcy flow.The revised abandonment pressure can be calculated according to the ultimate output of site engineering facilities and economic evaluation.Taking the production capacity test data of H gas field abroad as an example,the modified abandonment pressure and recalculated recovery efficiency obtained by this method are closer to the actual demonstrated value of the gas field,so as to improve the reliability of the calculation of related parameters in the subsequent gas field evaluation and development process.

关 键 词：气藏 废弃压力 表皮系数 附加压力降 

分 类 号：TE319[石油与天然气工程—油气田开发工程]