摘要
由于投入低、操作简单,自流注水在国内外很多油田得到了广泛应用。针对目前自流注水量计算复杂,难以在实际油田进行推广应用的问题,通过对常规物质平衡方程进行改进,并结合拟稳态理论,进行了一系列公式推导,并建立了基于流压速率的快速计算自流注水量的新方法。计算结果表明:自流注水量受到油藏瞬时产液量及瞬时流压速率的影响,如果生产制度不发生变化,即油藏以定液量进行生产,自流注水量只随流压速率发生变化。在自流注水初期,地层压力上升较快,流压速率较大,自流注水量也较大;达到拟稳态后,流压速率为常数,即一个生产制度对应一个流压速率,也对应一个自流注水量。该方法应用于H油田,通过公式计算得到的自流注水量与PLT生产测井实际测试的结果相对误差仅为5.73%,在可以接受范围。研究成果为同类型油藏自流注水量的计算提供了一种简单快捷、经济实用的便于矿场应用的新方法。
Dumpflood is increasingly applied in many oilfields because of its simple operation and low cost.This technique is hard to be popularized and applied in the oilfields for complex calculation of dumpflood rate.Common material balance equation is improved,and a series of formulas is deduced combined with pseudo-steady state theories.A new method for quickly calculating the dumpflood rate is proposed based on bot-tomhole pressure rate.Calculation result shows that instantaneous fluid production and instantaneous bottomhole pressure rate of the reservoir have influence on the dumpflood rate.If fluid production is constant,the dumpflood rate changes only with the bottomhole pressure rate.At the early stage of the dumpflood,the formation pressure increases very fast,and bottom hole pressure rate goes up,so the dumpflood rate is high.When the pseudo steady state is reached,the bottom hole pressure rate is constant,which means one production system has one bottom hole pressure rate and one dumpflood rate.This method is applied to H Oilfield.The relative error between the dumpflood rate calculated by this method and the PLT test is only 5.73%within acceptable range.This result will provide a new simple and economic method for the dumpflood rate calculation in other same type of reservoirs.
作者
李小东
任飞
杨勇
刘远志
孙常伟
任凯
Li Xiaodong;Ren Fei;Yang Yong;Liu Yuanzhi;Sun Changwei;Ren Kai(Shenzhen Branch,CNOOC China Limited,Shenzhen Guangdong 518024;Dazhou Administration of Emergency Management,Dazhou Sichuan 635000)
出处
《中外能源》
CAS
2020年第1期52-55,共4页
Sino-Global Energy
基金
中海石油(中国)有限公司科研项目“考虑沉积韵律单砂体储层精细构型及描述”(项目编号:YXKY-2018-SZLH-03).
关键词
自流注水
注水量
计算方法
物质平衡方程
流压速率
dumpflood rate
injection rate
calculation method
material balance equation
bottomhole pressure rate
作者简介
李小东,硕士,工程师,2011年毕业于德国克劳斯塔尔工业大学油藏管理专业,长期从事油气田开发与开采技术工作。E-mail:lixd5@cnooc.com.cn
