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低渗透岩心聚合物驱提高采收率实验研究

期刊名称：油田化学，2008，（02）
时间：0
分类：TE357.46[石油与天然气工程—油气田开发工程] TE39[石油与天然气工程—油气田开发工程]
作者机构：[1]提高油气采收率教育部重点实验室（大庆石油学院）,黑龙江大庆163318, [2]中国石油大庆油田公司第一采油厂,黑龙江大庆163112
相关基金：国家自然科学基金重点项目“低渗透油层提高驱油效率的机理研究”（项目编号50634020）.
相关项目：低渗透油层提高驱油效率的机理研究

关键词：聚合物驱, 双聚合物段塞, 岩心驱油, 驱油效果, 三岩心并联模型, 非均质性, 低渗透性, 大庆油田, polymer flood , double polymer slugs , oil displacement in cores , oil displacement efficiency, triple parallel core sets , heterogeneity, low permeability, Daqing oil fields

中文摘要：

考察了为大庆低渗油层筛选的大庆炼化普通聚合物（P1，M^-=4．96×10^6）和抗盐聚合物（P2，M=6．56×10^6）45℃时在φ5cm×10cm、Kw分别为0．02、0．05、0．1μm^2的并联三岩心组上的驱油效果。用清水配制P1溶液，用矿化度3．7g／L人工盐水配制P，溶液并驱替岩心，聚合物溶液浓度1．0和1．2g／L。驱替方案分为3组共8个，每个方案均包括注入0.57PV的P1、P2两个聚合物段塞。驱替实验结果如下：P2（盐水溶液）的驱油效果好于P1（清水溶液）；并联岩心组中，高渗岩心采收率最高，中渗岩心次之，低渗岩心再次之；不论P1、P2段塞之间是否有水驱，先注P1再注P2方案的采收率普遍高于先注P2再注P1的方案；两聚合物段塞依次连续注入方案的采收率，高于两段塞间有水驱的方案的采收率；注入1．2g／L聚合物段塞方案的采收率，高于注入1.0g／L聚合物段塞方案的采收率；饱和油的岩心不经水驱而直接注聚合物段塞的方案，其采收率高于先水驱再聚合物驱方案的采收率。表4参4。

英文摘要：

The oil displacement functions of a standard polymer, P1, with M= 4.96 × 10^6 and a salt tolerant AM coplymer, P2, withM=6.56× 10^6 manufactured by Daqing Refinery and Chemicals and selected for use in polymer flood projects in Daqing low permeability reservoir layers are investigated at 45℃ on parallel triple artifidal cores of permeability 0.02, 0.05, and 0.1 μm^2 and 2.5 cm in diameter and 10 crn long. P1 solution is prepared in a freshwater and Pzsolutior, inabrineofTSD=3.7g/L, thelatter is used as flooding water, too. The concentration of polymer solutions is of 1.0 and 1.2 g/L. Totally 8 injecting procedures are designed and every one ineludes one P1 and one Pz slug in size of 0.57 PV. The results of polymer flooding on cores are stated as follows： the oil displaeement efficiancy of P2 in brine solution is always higher than that of P1 in fresh water solution; the higher the core permeability the higher the enhancement in oil recovery （EiOR） is observed in every core set; the EiOR is always higher when P1 is injected prior to P2 than that when P2 is injected prior to P1 no matter whether a water flooding is applied between the two polymer slugs or not; the EiOR is higher when two polymer slugs are injected successively in comparison with injection procedures with water flooding between two polymer slugs; the EiOR is higher with 1.2 g/L polymer slugs used than with 1.0 g/L ones; higher EiOR is observed when oil saturated core sets are flooded firstly by a polymer solution rather than by water injection.

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