水平井筒气水两相流动压降规律研究  

Study on Pressure Drop Regularity of Gas/Water Two Phase Flows in Horizontal Well

作　　者：彭壮[1] 汪国琴[1] 徐磊[1] 何显荣[1] 王春燕[2] 胡松[3] 

机构地区：[1]长江大学石油工程学院,湖北武汉430100 [2]中国石油辽河油田公司,辽宁盘锦124010 [3]中国石油新疆油田公司,新疆克拉玛依834000

出　　处：《天然气与石油》2015年第3期74-78,11,共5页Natural Gas and Oil

摘　　要：采用水平井开发有水气藏时,由于水平井中复杂的两相渗流规律以及水平井筒中特殊的流动状态,使得当流体从孔眼流入时会对水平流动产生显著影响,造成常规水平圆管气水两相流动规律不适用,其突出表现为流动中的压降变化。为了探索水平井筒气水两相流动压降分布规律,运用划分微元段的思想,建立了水平段一维混合流动井筒压降计算模型,在此基础上建立了水平气井携液模型,并采用Fluent流体仿真软件模拟气水同产水平井筒内的混合流动。研究表明,随着主流流速的增大,井壁摩擦压降、孔眼粗糙度压降以及混合压降都增大;井径的增加导致井壁摩擦压降和孔眼粗糙度压降都减小;而流体黏度只对孔眼粗糙度压降产生影响,增加黏度会引起粗糙度压降的增加。数值模拟结果表明,从井筒指端到跟端,流量增大,流速增大,孔眼入流会产生压力降,沿程总压力减小,符合井筒流动压降的原理。In water-bearing gas reservoir development by using horizontal well mode, fluid inflow through perforation may produce remarkable effect on horizontal flow due to complex two phase seepage rule and special flow state of horizontal well, which may result in the change of pressure drop in fluid flow. In order to research flow pattern and pressure drop distribution regularity of two phase flow in horizontal well, established is a pressure drop calculation model for horizontal gas/water well and a liquid drop carrying model for horizontal gas well and applied is the Fluent fluid simulation software to simulate the gas/water two phase mixing flow in horizontal well. Research results show that friction pressure drop, perforation roughness pressure drop and mixing pressure drop will increase along with increase of main flow velocity, well diameter increase can decrease friction pressure drop and perforation roughness pressure drop, fluid viscosity affects perforation roughness pressure drop only, viscosity increase may make the roughness pressure drop increase. Numerical simulation results show that flow rate and flow velocity increase from inlet to the outlet, perforation inflow will produce pressure drop, which comply with the principle of wellbore flow pressure drop.

关 键 词：水平井筒 变质量流 压降 计算模型 数值模拟 

分 类 号：TE312[石油与天然气工程—油气田开发工程]