摘要
BZ油田是渤海南部典型的中轻质油藏,主要采用水平井开发,初期采油速度高达4%,稳产3年后开始递减,初期递减率达到28%。目前开采9年,油田综合含水率80%,但递减率仍较高,约为12%。研究产量递减规律常用的Arps、翁氏模型、Logistic函数只是简单的产量与时间关系的数学模型,对其递减原理理论研究较少,亦未能直接反映油田本身物性、流体特征。因此,本文根据BZ油田相渗曲线及流体性质,结合物质平衡关系建立一种产量随时间递减关系的新模型。创新点在于提出了"分段直线法"相对渗透率曲线拟合模型及"分段预测模型法"预测递减阶段的产量。该模型与油田实际产量符合较好,预测精度达到90%,为科学指导油田产量规划提供了简单有力依据,同时为其他油田产量预测提供了借鉴。
BZ oilfield which is mainly developed by horizontal wells is a typical light oil reservior in south Bohai.The initial oil production rate was as high as 4 %, it began to decline after 3 years of stable production, and the initial decline rate reached 28 %. At present, the oilfield has been developed for nine years with a comprehensive water cut of 80 %, but the decline rate is still high, about 12 %.Arps,Wengshi model and Logistic function, which are commonly used to study the law of production decline, are only simple mathematical models of the relationship between production and time, but there are few theoretical studies on the principle of production decline. They also fail to directly reflect the physical properties and fluid characteristics of oilfields. Therefore, in this paper, according to the BZ oil phase permeability curve, fluid properties, and combined with the material balance relationship to build a new model of production decrease with time. The innovation lies in the proposed "piecewise linear method" relative permeability curve fitting model and "piecewise prediction model method" to predict the oil production in decline stage. The model coincide well with oilfield actual production, the prediction accuracy reaches 90 %.It provides a simple and effective basis for scientific guiding oilfield production planning, at the same time provides a reference for production prediction for other oilfield.
作者
刘美佳
周凤军
陈存良
孙广义
杨明
LIU Meijia;ZHOU Fengjun;CHEN Cunliang;SUN Guangyi;YANG Ming(Tianjin Branch of CNOOC Ltd.,Tianjin 300459,China)
出处
《石油化工应用》
CAS
2019年第3期9-12,共4页
Petrochemical Industry Application
基金
国家科技重大专项"渤海油田加密调整及提高采收率油藏工程技术示范"
项目编号:2016ZX05058001
中海石油(中国)有限公司综合科研项目"渤海双高油田挖潜关键技术研究"
项目编号:YXKY-2018-TJ-04
关键词
海上油田
递减率
产量预测
新模型
offshore oilfields
decline rate
production forecast
a new model
