体积压裂直井油气产能预测模型  

Productivity model of oil/gas productivity of vertical wells in simulated reservoir volume

作　　者：陈志明[1] 廖新维[1] 赵晓亮[1] 王欢[1] 叶恒[1] 祝浪涛 陈奕洲 

机构地区：[1]中国石油大学(北京)石油工程教育部重点实验室,北京102249

出　　处：《油气地质与采收率》2015年第6期121-126,共6页Petroleum Geology and Recovery Efficiency

基　　金：国家"973"计划"陆相致密油高效开发基础研究"(2015CB250905);国家自然科学基金"超低渗透油藏注气提高采收率理论与技术研究"(U1262101);中国石油大学(北京)科研基金资助"CO2驱渗流机理及理论模型研究"(No.00000)

摘　　要：在直井体积压裂过程中,由于地质和工程等因素的影响,压裂井的裂缝分支数和长度具有多样性。但目前提出的分支裂缝井产能预测模型主要针对2分支、4分支和对称多分支无限导流裂缝井,这些都是实际情况的特例,具有很大的局限性,缺乏一个适用于体积压裂后通用的不对称多分支裂缝井产能预测模型。为此,基于稳定流理论,应用保角变换,推导了完全不对称多分支裂缝直井产能预测模型,并利用已有的研究成果来检验模型的准确性。同时,通过实例,分析了地层渗透率、厚度、流体粘度、裂缝长度、裂缝导流能力和裂缝分支数对裂缝井产能的影响。结果表明,经过特殊取值,由新建模型可得到目前常用模型,准确性得以验证。通过分析发现,随着裂缝长度和导流能力的增加,裂缝井产能增大,但产能增幅随供给半径的增大而减小;随着裂缝分支数的增大,裂缝井产能增加,但增幅随分支数的增大而变小。Due to geologic and engineering factors,the number and length of the fracture in the vertical wells is various in simulated reservoir volume. Although many productivity models have been proposed for the vertical wells with branch fractures,they are all special cases of two-branch,four-branch and symmetry multi-branch with infinite flow in fractured wells.Thus their reliabilities cannot be guaranteed. Therefore,a new productivity model of the vertical wells with multiple arbitrary fractures needs to be established. Conformal transformation was applied to calculate the productivity of the vertical wells with multiple fractures under steady state flow pattern. Our model is verified by these existing models. In addition,reservoir permeability,thickness,fluid viscosity,length,conductivity,and branch number of the fractures that affect the productivity of the fractured wells were analyzed through cases. The results show that the new built model matches the commonly used models well at a selected value,so its accuracy can be verified. The productivity of the fractured vertical wells increases with the increase of the fracture length,conductivity or branch number,but its increasing range may decrease with the increase of supply radius or branch number.

关 键 词：体积压裂 多分支裂缝 稳定渗流 保角变换 产能预测 因素分析 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]