基于三相渗流机理的自然递减模型研究--以温米油田为例

为了掌握当地下存在三相渗流时的油田开发规律,有效控制自然递减,从分析地层流体渗流机理入手,结合油气水三相渗流时产量积分表达式,系统分析含水、地层压力、生产压差、气油比、剖面动用对产量的影响,并利用Visual Basic编制开发程序,建立了基于三相渗流机理的自然递减率多因素计算模型。实践证明该模型计算结果与实际数据相对误差在5％之内,吻合程度较高。利用该模型可以量化评价含水、地层压力、生产压差、气油比、剖面动用的变化对自然递减的影响,提高制定技术政策的合理性和科学性,有助于提高油藏管理水平。

Study of natural decline models based on three phase percolation mechanism--taking Wenmi oilfield as example

In order to understand development rules of oilfield and control natural decline efficiently when three phase percolation existed underground, according to formation fluid percolation mechanism, combined with production integral formula at oil -gas -water three phases, the effects of total water cut, formation pressure, producing pressure differential, gas oil ratio and profile producing degree on production are systematically analyzed. Calculation model of multiple factors for natural decline rate based on three-phase percolation is established using Visual Basic procedures. The calculation results accord with the actual data and the relative error is within 5%. Using this model may quantitatively e-valuate the influence of water cut, formation pressure, producing pressure differential, gas-oil ratio, and profile producing degree on natural decline. So the rationality of establishing technology policy is improved and management level of oilfield is enhanced.