井筒变流量气井携液临界流量的确定方法——以东海西湖凹陷多层合采气井为例

摘要

井筒常流量气井携液临界流量的确定主要取决于井筒的截面面积.对东海西湖凹陷多层合采气井的调查发现,积液面位于井筒生产滑套处的井数占调查井数的39％.为了揭示井筒变流量气井积液的多样性,以东海西湖凹陷多层合采气井为研究对象,从建立区域携液临界流量模型入手,形成了一套由井筒变流量气井携液临界流量的确定方法,包括模型系数值拟合数据的选择、最易产生积液的井筒节点的筛选条件、井筒节点携液临界流量到气井携液临界流量的转化方法等.研究认为:多层合采气井的分段式流量分布,是导致多层合采气井积液现象普遍高于单层开采井,以及积液面通常处于生产滑套处的主要原因,这对多层合采气井的合理配产研究具有一定的借鉴意义.%For the constant wellbore-rate gas well,the critical liquid carrying flow rate depends on cross-sectional area of wellbore.However,in the research of multi-completion gas wells in Xihu Sag of the East China Sea,there aer 39％ of the survey wells with the accumulated fluid levels located at the sliding sleeves.A set of determination method of measuring critical liquid carrying flow rate in the variable wellbore-rate gas wells was formed by building a regional critical liquid carrying flow rate model with gas wells.This method includes the selection of fitting data of model coefficient X,the condition of filtering the wellbore node where is most likely to appear accumulated fluid,and the transformation method of turning the critical liquid carrying flow rate at the wellbore node to that in the whole well.The result shows that sectional flow distribution in multi-completion gas wells results more effusion than that in single layer wells and the accumulated fluid levels are usually located at the sliding sleeves.The study has certain reference significance for rational production adjustment in multi-completion gas wells.