考虑滑脱效应的致密气井压裂效果评价方法  

An evaluation method of evaluate fracturing efficiency for tight gas well considering slippage

作　　者：窦祥骥[1] 廖新维[1] 赵晓亮[1] 陈志明[1] 祝浪涛 

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：《科技导报》2015年第13期46-51,共6页Science & Technology Review

基　　金：国家自然科学基金项目(U1262101)

摘　　要：提出一套适用于致密砂岩压裂气井的裂缝半长及滑脱因子确定新方法。首先对传统的线性流分析进行了误差分析,并通过引入新的拟参数,对相应的关系式进行了修正,从而充分考虑气体物性变化及滑脱效应对动态反演过程的影响,进一步结合迭代思想,最终给出了裂缝半长及滑脱因子的确定流程。基于理论及实践应用研究表明,新的校正方法和流程可有效控制传统方法所造成的压裂效果评价误差,可为存在滑脱效应的致密砂岩气井动态反演研究提供参考。This paper proposes a new fracture half-length and slippage factor determination method for fractured wells in tight gas reservoirs. The tight gas reservoir is mainly developed with hydraulic fracturing. The traditional fracture half-length determination method based on production data analysis may lead to error in some tight gas wells due to ignoring the pressure-dependent gas properties and the existence of gas slippage. Besides, quick and accurate determination of slippage factor is also a problem that remains to be solved. To fulfill this target, relevant equations are modified based on linear/low analysis by introducing new pseudoparameters so as to take the pressure-dependent properties and slippage flow into consideration. By combining the idea of iteration, a new procedure used to evaluate the fracturing efficiency as well as determine the slippage factor is proposed and validated by both synthetic and filed examples. The validation procedure shows that this method is convenient and accurate in fracture efficiency evaluation. Therefore, this method could provide reference for dynamic retrieval of tight sandstone gas reservoir struggling with slippage phenomenon.

关 键 词：致密气藏 生产动态数据分析 线性流分析 滑脱效应 裂缝半长 

分 类 号：TE377[石油与天然气工程—油气田开发工程]