应力敏感微纳米孔隙储层压裂裂缝反演方法  

Inversion method for hydraulic fracture in stress-sensitive formation with micro-nano pores

作　　者：窦祥骥[1] 廖新维[1] 赵晓亮[1] 陈志明[1] 郭新慧[1] 

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》2016年第2期76-82,共7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"(2015CB250900)

摘　　要：随着天然气供需矛盾的不断加剧,孔隙半径为微纳米级别的非常规气藏已成为当前开发的热点。由于非常规储层孔隙半径较小,气体在这类非常规储层流动过程中易出现滑脱效应,加之此类储层常呈现出一定的应力敏感性,从而导致气井渗流特征较为复杂,对压裂裂缝反演造成较大影响。对于具有应力敏感微纳米孔隙储层的气藏,目前仍缺乏同时考虑渗透率应力敏感性及滑脱效应,并将滑脱因子视为压力函数的动态反演方法,因此在确定裂缝参数时常导致一定的误差。为此,在实验研究的基础上,分析不同渗流特征条件下传统生产动态数据分析方法的误差情况,并通过引入修正拟参数对传统方法进行修正,最终建立适用于应力敏感微纳米孔隙储层的压裂裂缝反演方法。现场实例验证结果表明,该方法可以建立新的直线关系,从而为基于动态反演方法确定此类储层的裂缝长度创造了可能。Unconventional gas reservoirs with micro-nano pore radius have been a hot spot with the increasing contradiction between supply and demand of natural gas. These reservoirs are always stress-sensitive. Besides,the small pore may lead to the existence of gas slippage when gas flows in unconventional reservoirs. Both of the above two properties would result in complex seepage characteristics and influence the inversion process for hydraulic fracture. However,there is not an existing method which takes both permeability stress-sensitivity and slippage into consideration for stress-sensitive reservoir with micro-nano pores and views the slippage factor as a function of pressure. Therefore,based on experiments,the error,caused by traditional product dynamic data analysis under different seepage,was analyzed and the traditional method was modified by introducing new pseudo-parameters to propose a new inversion method for stress-sensitive formation with micro-nano pores finally. The results show that a new linear relationship can be extracted through the method to provide a probability for determination of the fracture length of the reservoir.

关 键 词：非常规气藏 动态反演 人工裂缝 应力敏感 滑脱效应 

分 类 号：TE357.11[石油与天然气工程—油气田开发工程]