基于试井反馈信号判定小层连通性技术

Technology For Determining Small Layer Connectivity Based on Well Test Feedback Signals

涠洲A油田为陆相复杂断块油田,开发层位流二段为薄互层油藏,砂体连通性复杂。为落实井间连通性,开展干扰试井研究,对干扰试井压力响应速度和砂体宽厚比分析,建立了流二段干扰试井压力响应经验公式,提出薄互层油藏小层连通性定量表征方法,认为油藏纵向上不连通,小层占比与干扰信号接收时间和井间压力系数差异的乘积呈幂函数关系。对该油田中块2井区5口生产井间连通性分析,明确了平面井点和纵向小层连通关系,指导了下步4口调整井部署和注采关系优化措施,能够提高区块采收率9.2%,为该类复杂断块油田薄互层油藏连通性分析提供了解决思路。

Weizhou A oilfield is a continental complex fault block oilfield.The second member of Liushagang reservoir in development horizon is thin interbedded reservoir with complex sand body connectivity.In order to implement the connectivity between wells,the study of interference well testing has been carried out.Based on the analysis of pressure response speed and width-thickness ratio of sand body,an empirical formula for pressure response of interference well testing has been established,and a quantitative characterization method for the connectivity of thin interbedded reservoirs has been proposed.It is considered that the product of the proportion of vertical unconnected layers and the difference of signal receiving time and pressure coefficient between wells is a power function.Connectivity analysis of 5 production wells in the middle block of the oilfield has made,and the connection relationship between the planar well point and the vertical layer is obtained.Guided the next four adjustment wells deployment and injectionproduction relationship optimization measures,which can improve block recovery by 9.2%.It also provides a solution for the connectivity analysis of thin interbedded reservoirs in similar complex fault block oilfields.