油气同采方式下气顶油藏原油侵入状况的判断与调整

发布时间：2018-05-09 23:04

本文选题：油气同采 + 气顶油藏　；参考：《中国海上油气》2017年05期

【摘要】：东海西湖凹陷AC气顶油藏采用利用天然能量、同一套井网同时开采气顶和油区的开发方式,动态跟踪过程中难以判断原油侵入气顶状况。基于物质平衡原理,推导出了计算原油侵入气顶体积的公式,并构建了原油侵入指示曲线(原油侵入气顶体积百分数-生产时间关系曲线),该曲线与X轴交点即为原油侵入气顶的起始时间,曲线单调性反映流体的移动方向,斜率则反映移动速度。利用本文方法对AC气顶油藏原油侵入情况进行了分析,结果表明在原油采出程度为4.3%时,原油即已快速侵入气顶。综合AC气顶油藏采气速度的敏感性分析、现场系统试井结果,认识到通过降低采油速度可降低生产气油比,从而达到降低采气速度遏制原油进一步快速侵入气顶的目的,最终现场实施效果明显。本文方法对指导同类气顶油藏的开发具有重要的借鉴意义。
[Abstract]:The AC gas cap reservoir in Xihu sag in the East China Sea is developed by using natural energy and producing gas cap and oil area simultaneously with the same set of well pattern. It is difficult to judge the condition of oil intruding into gas cap during dynamic tracking. Based on the principle of mass balance, a formula for calculating the volume of crude oil invading the gas cap is derived. The crude oil invasion indicator curve (crude oil invasion gas cap volume percentage-production time relationship curve) is constructed. The intersection point between the curve and the X axis is the starting time of the crude oil invasion gas cap, and the curve monotonously reflects the direction of fluid movement. The slope reflects the speed of movement. By using this method, the oil intrusion of AC gas cap reservoir is analyzed. The results show that when the recovery degree of oil is 4.3, the crude oil has quickly invaded the gas cap. Based on the sensitivity analysis of gas recovery rate in AC gas cap reservoir and the field test results, it is recognized that the ratio of production gas to oil can be reduced by reducing the oil recovery rate, thus achieving the purpose of reducing the gas recovery rate to restrain the crude oil from further rapidly invading the gas cap. The final site implementation effect is obvious. This method can be used for reference to guide the development of similar gas cap reservoirs.
【作者单位】：中海石油(中国)有限公司上海分公司勘探开发研究院;
【基金】：“十三五”国家科技重大专项“大型油气田及煤层气开发(编号:2016ZX05027)”部分研究成果
【分类号】：TE53

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