利用录井资料计算低渗气井压裂产能的新方法

A new method to calculate fracturing productivity of low permeability gas well
using logging data

刘子雄 李敬松 黄子俊 吴英 曾鸣 张华

中海油田服务股份有限公司油田生产研究院，天津 300450 中国石化中原油田分公司采油三厂，山东 莘县 252429

Research Institute of Oilfield Production, COSL, Tianjin 300450, China No.3 Oil Production Plant, Zhongyuan Oilfield Company, SINOPEC, Shenxian 252429, China

目前，低渗气井压裂产能的预测主要采用数值模拟法、经验公式计算法和经验统计法，但这些方法在实际应用时很难准确预测低渗气井压裂产能，主要是由于难以准确选取相应的储层物性参数（孔隙度、渗透率、含水饱和度等），导致计算误差大。分析各种参数对气井压裂产能的影响认为，单一物性参数及多种参数的组合与气井压裂产量的相关性都很差，难以找出可靠的经验计算方法。通过研究得出，录井时全烃的大小和形态能直接准确地反映储层的产气能力，压裂层的全烃值与该层基质全烃背景值的比值同产能相关性较好。通过验证表明，该方法能够准确计算气井压裂产能，且计算方便，能有效指导低渗气井压裂产能的预测。

At present, the fracturing prediction of low permeability gas well mainly uses numerical simulation method and theoretical formula calculation method or experience formula calculation method. In the actual application, the methods commonly used are difficult to accurately predict the fracturing productivity of low permeability gas well. Because those methods need a lot of related parameters of reservoir property, such as porosity, permeability and water saturation, and the results are different when the parameter and condition are different, therefore, in the calculation, it is difficult to accurately select the corresponding physical parameters, resulting in a great error. The fracturing analysis on various influencing parameters of low permeability gas shows that both with a single physical parameter or multiple parameters, the production correlation after fracturing is poor and it is difficult to identify the reliable experience calculation method. Through the study, it is considered that the size and shape of logging of total hydrocarbons can directly reflect the gas productivity of reservoir. The ratio value of the total hydrocarbon value for fractured layer and the matrix background value has a good correlation with productivity. It is verified that this method can accurately calculate the fracturing productivity of low permeability gas well. It is also simple and can provide a guiding for predicting the fracturing productivity of low permeability gas well.

10.6056/dkyqt201404021