摘要
运用微分的方法对裸眼完井水平含水气井分层流的井筒压降进行了研究,针对气液两相分层流动特点,结合裸眼完井的井壁均匀入流的实际流动情况,推导出了适合计算裸眼完井水平含水气井分层流井筒压降的简单实用公式。在推导的过程中进行了如下假设:液相为不可压缩的牛顿流体;相间不存在传质;等温、稳态流动;不考虑滑脱效应,气相和液相的流速相同;井筒中气相、液相的密度为常数;忽略井壁入流引起的混合损失。采用所推导出的公式对不同井径裸眼水平气井的井筒压降进行计算,得到了水平井段的压降及水平井筒中的压力分布情况。计算结果表明在井径较小时井筒中的压降较高,因此在进行气井产能预测时不能将其忽略。水平井筒的井径对井筒压降的影响非常大,增大井径会很大程度地减小水平井筒中的压降,增加气井的产能。
The borehole pressure drop for stratified flow in water produced horizontal gas well with barefoot completion is researched based on differential method. There is two phase stratified flow （liquid flow and gas flow） in the horizontal well, and the inflow to the wellbore with barefoot completion is even. Based on the fact, the simple and practical formula to calculate the borehole pressure drop for stratified flow in water produced horizontal gas well with barefoot completion is derived. During the derivation, it is assumed： the liquid phase is incompressible Newton fluid; there is no mass transfer between phases; it is homothermal and steady state flow; the flow rate of gas phase and that of the liquid phase are the same without the consideration of slippage effect ; the density of gas phase and that of the liquid phase in the wellbore are constants; the mixed loss caused by inflow from wellbore is ignored. With the application of the derived formula, the wellbore pressure drops of naked horizontal wells with different hole diameters are calculated, and the pressure drop of the horizontal hole section and pressure distribution in horizontal wellbore are obtained. The calculation results suggest that for smaller hole diameter, the pressure drop in the wellbore is higher. Therefore, the pressure drop can not be ignored for gas well productivity prediction. The effect of the hole diameter of the horizontal wellbore to wellbore pressure drop is great, and the pressure drop of the horizontal wellbore will be decreased with increasing hole diameter, and then increase the productivity of the gas well.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2007年第5期91-93,共3页
Petroleum Geology & Oilfield Development in Daqing
关键词
裸眼完井
水平气井
井筒压降
分层流
压力分布
barefoot completion
horizontal gas well
borehole pressure drop
stratified flow
pressure distribution
