摘要
类比法是一种预测低渗气井压裂产能的重要方法,应用时会受经验丰富程度的影响,而且难以实现定量预测。文中引入模式识别,成功地进行了低渗气井压裂产能定性和定量预测,分析确定了影响压裂产能的主要因素为储层渗透率、含水饱和度、储层有效厚度、孔隙度、岩石密度、裂缝半长。首先结合粗糙集理论确定各个参数的权重系数,然后根据区块已测试井参数建立了识别模版。对常规的欧氏距离方法进行加权,构建相应的隶属度函数,找出待计算井与模版中相似度最高的样本,进行定性和定量计算。通过对某区块8口压裂井验证,其单井产能计算误差均在20%以内。这表明,该方法计算可靠,准确性高,消除了类比法中人为因素的影响,能够准确地定量计算压裂产能。
The productivity predicting of low-permeability fractured gas well using analogy method is affected by researcher′ s experience, and it is difficult to achieve quantitative predictions. By introducing the pattern recognition method, qualitative and quantitative predictions were successfully carried out. Firstly, this paper analyzes the main factors affecting the fracturing capacity,such as reservoir permeability, water saturation, effective thickness, porosity, rock density, fracture half-length; then with rough set theory, the individual parameter weight coefficients are determined; finally, according to the block parameters of tested wells,recognition template is built. The corresponding membership functions are constructed through weighting conventional Euclidean distance. From calculated wells and template samples, we find out wells with the highest similarity for qualitative and quantitative calculations. Actually, the productivity calculation inaccuracies of eight wells are less than 20%. The results show that this method is reliable, highly accurate, and eliminates the human factors′ influence, and can calculate the quantitative fracturing capacity accurately.
出处
《断块油气田》
CAS
北大核心
2015年第4期505-507,541,共4页
Fault-Block Oil & Gas Field
基金
中海油田服务股份有限公司科研项目"海上低渗油气田压裂油藏方案设计与方法研究"(YSB13YF013)
关键词
类比法
模式识别
压裂产能
权重
欧氏距离
analogy
pattern recognition
fracturing productivity
weights
Euclidean distance
