活跃边底水油藏开发后期水平井参数优化——以长堤油田桩1块Ng3油层为例

Parameter optimization for the horizontal well at the production tail in oil reservoirs with active edge water and bottom water--a case of Ng3 reservoirZhuangl block,Changdi Oilfield

针对长堤油田桩1块Ng3油层综合含水率高达96.3%,开发效果变差的实际情况,应用油藏工程分析及数值模拟方法,在油层剩余油分布特点及水平井调整的可行性研究的基础上,分析了影响其产能及含水率上升的主要因素,确定了水平井应尽量部署在油层构造的较高部位,且距油层顶2m左右,并尽量与构造线平行;与老井井距不能小于水锥半径;水平井段长度为200m,初期产液量为200m^3/d,当含水率达到85%时可提高产液量至400m^3/d,实施后开发效果较好,累积产油量达2 603×10~4t,采出程度为20.10%,预计比调整前提高采收率6.2%。

In Ng3 reservoir,Zhuang1 block,Changdi Oilfield,development result is not very well with composite water cut up to 96.3%.Reservoir engineering analysis and numerical simulation method are applied to the research of remaining oil distribution regularity and the feasibility of horizontal well drilling.Main factors of influencing the productivity and water cut are analyzed.We know that the horizontal wells must locate on the top of oil layer with two meters,must parallel to structure lines.Well spacing is not less than water coning radius,horizontal length is 200 meters,and original liquid production is 200m^3 /d.When water cut reaches to 85%,liquid -production can bring up to 400m^3 /d.It achieved good results after application.