聚驱阶段流压界限分析及压裂层段优选  

Analysis of Flow Pressure Boundary and Optimization of Fracturing Interval in Polymer Flooding Stage

作　　者：李国新 LI Guoxin(Geological Research Institute of the 5th Oil Production Plant,Petrochina Daqing Oilfield Campany Limited,Daqing,Heilongjiang 163513,China)

机构地区：[1]中国石油大庆油田有限责任公司第五采油厂地质研究所,黑龙江大庆163513

出　　处：《石油工业技术监督》2023年第7期1-4,共4页Technology Supervision in Petroleum Industry

基　　金：国家重大科技专项“大庆长垣特高含水油田提高采收率示范工程”(编号:2016ZX05054)。

摘　　要：为提高聚合物驱开发效果,以油层发育特征为依托,细化采出井类型,结合井组动态特征,研究不同类型井合理流压界限及压裂层段优选。研究表明,注聚初期合理流压3.5~7.6 MPa;含水低值期合理流压3.0~6.0 MPa;含水回升期合理流压大于4.8 MPa。在压裂时机和压裂层段上,含水下降期主压3、4类河道;含水低值期主压1、2类河道的中、低渗透层;含水回升期主压1、2类河道中的薄差层及动用差层。压裂后,Ⅰ类井的采液指数下降幅度最小,压裂有效期最长;Ⅱ类井在压后的第11个月采液指数下降到初期水平;Ⅲ类井采液指数下降幅度最大,压裂有效期最短。该项研究能够更加精准指导单井的方案调整和压裂改造工作,为聚驱开发提供经验。In order to improve the development effect of polymer flooding,the production well types were refined based on the develop-ment characteristics of reservoir,and the reasonable flow pressure limit and fracturing interval selection of different types of wells were studied combined with the dynamic characteristics of well groups.The study shows that the reasonable flow pressure in the initial stage of polymer injection is 3.5~7.6 MPa;reasonable flow pressure in low water content period is 3.0~6.0 MPa;reasonable flow pressure in water recovery period is greater than 4.8 MPa.In the fracturing time and fracturing interval,the main pressure channels in the water-cut decline stage are 3 and 4;in low water cut period,main pressure is on the middle and low permeability layers of 1 and 2 channels;but in the water recovery period,main pressure is on the thin difference layer and use difference layer of 1 and 2 channels.After fracturing,the decline of fluid recovery index of class I wells is the smallest,and the validity of fracturing is the longest.In class II wells,the fluid re-covery index dropped to the initial level in the 11th month after injection.Class III wells have the largest decrease in fluid recovery in-dex and the shortest fracturing validity.This study can guide the planning adjustment and fracturing reconstruction of single well more accurately,and provide experience for the development of polymer flooding.

关 键 词：聚合物驱 动态特征 合理流压 压裂层段 采液指数 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]