杏六区三次加密可行性及加密方案优化研究

大庆油田杏六区油藏已经进入高含水开发后期,剩余油分布零散、薄差油层整体动用程度低.在当前井网控制程度下,无法将表内薄层和表外储层的剩余油开采出来.在对杏六区油藏各类油层动用状况和水洗程度归纳分析的基础上,通过研究剩余油分布特点以及可调砂岩厚度,确定了三次加密调整采用五点法井网,保持注采井距在100～170 m的布井方式.并在已选定的布井方式基础上,设计了两套不同的三次加密方案,结合数值模拟和经济效益对两套布井方案进行优选、评价.最终确定在调整区内单独布一套油井,将二次加密井转注作为注入井,形成井距在144 m左右的五点法井网的加密方案.

The Xing6 district three encryption feasibility and encryption schemes

Reservoir in the middle district of Xing6 has gone into the high water cut stage. The scattered distribution of remaining oil and the poor spending of thin and poor oil layers are its present status. Under the present control of the well network, remaining oil in the thin layers and usable layers can＇t be produced. Through the research of the use of various types of reservoirs, the remaining oil distribution features and adjustable sandstone thickness in Xing6. Identified three encryption adjustment to use five spot well pattern and maintain in- jector well in the range of 100-170 m. Designed two different sets of three encryption schemes, combination of numerical simulation and economic benefits to optimize and evalu- ate two sets of well spacing program. Finally get a great encryption program.