鄂尔多斯盆地致密油藏注水开发效果实验研究——以延长组长6油层组为例  

Experimental Study on the Waterflooding Development Effect of Tight Oil Reservoir in Ordos Basin——Take Yanchang Group Chang 6 Oil Layer Group as an Example

作　　者：党海龙 贾自力 石立华 白璞 朱争 王继超 王艳 郭欢迎 DANG Hai-long;JIA Zi-li;SHILi-hua;Bai Pu;ZHU Zheng;WANG Ji-chao;WANG Yan;GUO Huan-ying(Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi'an 710075,China)

机构地区：[1]陕西延长石油(集团)有限公司,西安710075

出　　处：《当代化工》2022年第6期1282-1289,共8页Contemporary Chemical Industry

基　　金：国家自然科学基金青年基金项目(项目编号:41502100)。

摘　　要：为了研究致密油藏注水开发过程中储层非均质性对采收效果的影响,以陕西延长油田鄂尔多斯盆地贺庄长6油藏为基础,采用室内物理实验的方法,开展了注水开发效果的影响因素分析,明确了基质渗透率、小层个数、层间非均质特性及隔夹层发育程度对采收效果的影响。结果表明:基质渗透率与储层采收效果呈正向关系;在裂缝完全发展的情况下,小层个数的增加提高了储层渗吸作用的接触面积,虽然在短期阶段内,多层储层的采收率可能低于单层储层情况,但随着注入水的增加,多层储层的采收率将会逐渐提高;在实际油田进行分层注水方案设定时,可优先考虑存在天然裂缝的储层,其次是存在多种不同渗透率小层的储层;人工裂缝需要配合所开发储层的地质条件进行设计,对于天然裂缝发育的储层可以适当提高人工裂缝的导流能力以降低注入压力,提高基质与裂缝间的渗吸作用,对于储层内未充分发育的天然裂缝应适当降低人工裂缝的导流能力,从而提高注入压差,进而增大基质的采收效果。In order to study the influence of reservoir heterogeneity on the recovery effect during the water injection development of tight oil reservoirs, the Hezhuang Chang 6 reservoir of Yanchang oilfield in Ordos basin was used as the basis, using the method of indoor physical experiment, the influencing factor analysis of water injection development effect was carried out, and the influence of matrix permeability, number of small layers, interlayer heterogeneity and interlayer development degree on the recovery effect was clarified. The research results showed that the matrix permeability had a positive relationship with the recovery effect of the reservoir. When the fractures were fully developed, the increase of the number of small layers increased the contact area of reservoir imbibition. Although in the short term, the recovery rate of multi-layered reservoirs may be lower than that of single-layered reservoirs, as the injected water increases, the recovery rate of multi-layered reservoirs will gradually increase. When setting a layered water injection scheme in an actual oilfield, the reservoirs with natural fractures can be given priority, followed by the reservoirs with a variety of small layers with different permeability. Artificial fractures need to be designed in accordance with the geological conditions of the developed reservoir. For reservoirs with natural fractures, the conductivity of artificial fractures can be appropriately improved, the injection pressure can be reduced, and the imbibition between the matrix and the fractures can be improved. For the underdeveloped natural fractures in the reservoir, the conductivity of the artificial fractures should be appropriately reduced, so as to increase the injection pressure difference and increase the recovery effect of the matrix.

关 键 词：致密砂岩油藏 注水开发 提高采收率 含水率 

分 类 号：TE357[石油与天然气工程—油气田开发工程]