压驱注水提高低渗透油藏采收率研究——以胜坨油田坨斜726单元为例  

Enhanced Oil Recovery ratio of Low Permeability Reservoirs by Pressure-operated Water Injection:A Case Study of Tuoxie 726 Unit in Shengtuo Oilfield

作　　者：吴媛媛[1] 黄志伟[1] 崔永北[1] 张梦帆 WU Yuanyuan;HUANG Zhiwei;CUI Yongbei;ZHANG Mengfan(Shengli Oil Production Plant,Shengli Oilfield Company,SINOPEC,Dongying Shandong 257051)

机构地区：[1]中国石化集团胜利油田分公司胜利采油厂,山东东营257051

出　　处：《中国科技纵横》2024年第22期11-16,共6页China Science & Technology Overview

摘　　要：对胜坨油田坨71区块沙四纯上亚段有效驱替动力的研究可为东营凹陷浊积岩油藏的开发提供压驱注水理论支撑。本文通过对胜坨油田坨71地区地层特征和实际注入情况的精细分析,发现STT726X1、STT726X2受效有差异,主要受深水重力流砂体展布的影响。通过分析注入端、采出端的压力变化和生产情况,在本区块建立有效驱替压力梯度,测定有效驱替压力梯度为0.037 MPa·m^(-1)。在此基础上对地层孔隙中的驱替关系进行模拟,发现不同驱替动力下驱油效率存在较大差异,过高的驱替动力不一定有较好的驱油效率,在提高注水量和采液量的同时,还应考虑最佳的驱替动力,使井组获得长期稳产。The study on the effective displacement dynamics of pure upper sub-member of Sha 4 in Block 71 of Shengtuo Oilfield can provide theoretical support for the development of turbidite reservoir in Dongying sag.Through the detailed analysis of the formation and actual injection conditions in Tuo 71 area of Shengtuo Oilfield,it is coucluded that the difference between STT726X1 and STT726X2 is mainly affected by the distribution of deep-water gravity flow sandstone.According to the pressure changes and production conditions at the injection end and the production end,we established the effective displacement pressure gradient in this block,and which considered to be 0.037 MPa·m^(-1).On this basis,the displacement relationship in the formation pores is simulated,and it is found that there are great differences in oil displacement efficiency under different displacement dynamics,and too high displacement dynamics may not have better displacement efficiency.While improving the amount of water injection and liquid production,the best displacement dynamics should also be considered to achieve long-term stable production of the well group.

关 键 词：胜坨油田 沙四纯上亚段 压驱注水 微裂缝 有效驱替动力 

分 类 号：TE357[石油与天然气工程—油气田开发工程]