提高地层原油体积系数计算精度的方法

原油体积系数是新增区块储量计算必需的参数。鉴于在油田勘探开发中后期通过高压物性分析来获取体积系数通常难以实施,作者以胜利油区历年来高压物性分析的大量数据为依据,在全面分析各种影响因素的基础上,提出了一种新的基于油藏成藏规律认识的体积系数求取新方法。该方法一方面通过多元回归考虑油藏埋深、地面油密度、温度、压力等与体积系数求取相关且通过常规试油或测试就能获得的参数对体积系数的影响,另一方面通过残差类别进行修正以考虑地下影响因素(通过常规试油或测试不能获取),如气油比、饱和压力等对体积系数的影响,从而提高了体积系数求取的精度。

Method of enhancing calculation precision of crude oil volume factor

The crude oil volume factor is one of the necessary critical parameters to calculate the reserve of a new block.Usually,this parameter can not be obtained by PVT analysis when the oil exploration and development go into the middle-late stage.Based on a large quantity of PVT analysis data of the Shengli oil field and a after analysing the impact factors,this paper puts forward a new method which accords with the oil accumulation law.On the one hand,this method formulates experiential formulas using multiple factors,including depth,ground oil density,temperature,pressure,and so on.These factors can be obtained by tests.On the other hand,the residue is acquired by analogy to offset the impact of other factors such as the underground oil-gas ratio,saturation pressure which can not be obtained by tests.Thus,the precision of the crude oil volume factor is improved.