“三低”气藏气测录井产能预测方法  

Method for productivity prediction of three-low gas reservoirs with gas logging

作　　者：刘辉[1] 王晓阳[1] 乔玉珍[1] 王振华[1] 

机构地区：[1]中国石化集团华北石油局录井公司

出　　处：《录井工程》2012年第1期13-16,48,共5页Mud Logging Engineering

摘　　要：通过全烃与全脱值相关性研究,建立了钻井液含气量与地层含气量的关系式,再借助钻井液冲淡系数,获得了由全烃值计算地层含气量方法,为气测录井定量化解释开辟了新途径。在上述研究成果的基础上,通过对达西渗流公式推导获得平均渗透率计算公式,由大牛地气田5口井数据统计,建立了平均地层含气量与平均渗透率相关公式,从而实现用地层含气量参数替代渗透率的产能计算方法。尤其是对于"三低"气藏,地层含气量可以认为就是地层的含气丰度。分析了三种条件下(正压、负压和近平衡钻井条件)地层气渗入方式和地层气对全烃值的贡献,并对正压条件下自然建产的水平井的产能与地层含气量进行了相关性分析,最终建立了3种钻井条件下"三低"气藏的无阻流量的预测公式和方法,通过气测录井对"三低"气藏进行定量评价。Through the correlation study between total hydrocarbon and total degassed gas and then with the aid of dilution factor of drilling fluid,the authors established the relation expression between drilling fluid containing gas and formation gas content,obtained the method which used total hydrocarbon value to calculate formation gas content and opened up a new way to gas logging quantitative interpretation.Based on the above study results,the average permeability formula was got by derivation of Darcy flow equation.Through making data statistics of 5 wells of Daniudi gas field,the related formula of average formation gas content and average permeability was set up,thus obtaining the calculation method of production capacity,in which formation gas content is used to substitute the permeability.In particular,for three-low gas reservoirs,formation gas content was regarded as the abundance of gas bearing in the formations.The authors analyzed the modes of formation gas penetration under three conditions(positive pressure,underbalanced pressure and near-balanced drilling conditions) and the contributions of formation gas to total hydrocarbon,made the correlation analyses of the productivity and formation gas content of the horizontal wells which could naturally get into production under the condition of positive pressure,eventually established the open-flow potential prediction formula and methods for three-low gas reservoirs under the above three drilling conditions.

关 键 词：三低气藏 地层含气量 负压钻井 近平衡钻井 无阻流量 产能预测 

分 类 号：TE133.1[石油与天然气工程—油气勘探]