水平井涡流工具螺旋凹槽壁面液膜厚度理论研究
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摘要
涡流工具是近年来引入天然气行业的一种新型井底积液助排工具,该工具能够有效地提高气井的携液能力,减少流动压降损失,高效的排出井底积液。迄今为止,涡流排水采气技术在我国仍然处于现场试验阶段,缺乏相应的理论研究。液膜厚度是描述井下涡流排水采气工具作用效果的关键因素,本文对流经涡流工具螺旋凹槽的壁面液膜厚度进行首次理论探索。通过建立螺旋凹槽正交曲线坐标系,结合实际物理过程,将客观原型化繁为易,建立了涡流工具螺旋凹槽壁面液膜物理模型。在简化模型控制方程和假定边界条件的基础上,根据稳定液膜受力平衡和传质平衡条件,利用特征线法得到了涡流工具螺旋凹槽壁面液膜厚度理论解析解。该理论模型为评价涡流工具作用效果奠定了理论基础,并能够更加科学有效地指导涡流排水采气技术在现场的应用。
Vortex tool introduced into natural gas industry in recent years is a new type of assistant drainage tool for liquid loading.It can effectively improve the liquid carrying capacity of gas wells,reduce the loss of pressure drop,and efficiently discharge the liquid loading.Up to now,vortex dewatering gas production technology is still in the field test stage in China lacking corresponding theoretical research.The liquid film thickness is the key factor of describing the effect of downhole vortex tools.The wall film thickness flowing through spiral grooves of vortex tools was studied first theoretically.Orthogonal curvilinear coordinate system of the spiral groove was made.Combined with the actual physical process,the objective prototype was simplified and then physical model of liquid film on the spiral groove wall of vortex tool was set up.Based on simplifying the control equation of the model and assuming the boundary conditions,the theoretical analytical solution of the liquid film thickness on the spiral groove wall of the vortex tool was got by using the characteristic method according to the conditions of force balance and mass transfer balance of the stable liquid film.The theoretical model lays a theoretical foundation for evaluating the effect of vortex tool and can guide the application of vortex dewatering gas production technology in the field more scientifically and effectively.
Vortex tool introduced into natural gas industry in recent years is a new type of assistant drainage tool for liquid loading.It can effectively improve the liquid carrying capacity of gas wells,reduce the loss of pressure drop,and efficiently discharge the liquid loading.Up to now,vortex dewatering gas production technology is still in the field test stage in China lacking corresponding theoretical research.The liquid film thickness is the key factor of describing the effect of downhole vortex tools.The wall film thickness flowing through spiral grooves of vortex tools was studied first theoretically.Orthogonal curvilinear coordinate system of the spiral groove was made.Combined with the actual physical process,the objective prototype was simplified and then physical model of liquid film on the spiral groove wall of vortex tool was set up.Based on simplifying the control equation of the model and assuming the boundary conditions,the theoretical analytical solution of the liquid film thickness on the spiral groove wall of the vortex tool was got by using the characteristic method according to the conditions of force balance and mass transfer balance of the stable liquid film.The theoretical model lays a theoretical foundation for evaluating the effect of vortex tool and can guide the application of vortex dewatering gas production technology in the field more scientifically and effectively.
引文
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[3]许崇祯,张公社,魏壮壮,等.涡流排水采气数值模拟研究[J].能源化工,2018,39(2):13-17.
[4]周海松.井下涡流工具排水采气的影响因素与分析[J].石化技术,2017,24(4):174.
[5]李虎.涡流排水采气技术在辽河油田探索性研究[J].化工管理,2016(32):153.
[6]陈德春,付刚,韩昊.气井携液用涡流工具结构参数优化[J].石油钻采工艺,2016,38(3):400-404.
[7]王超,陈超,赵宁,等.用于水平环状流周向液膜特性测量的电导探针阵列[J].电子测量与仪器学报,2017,31(9):1408-1413.
[8]胡凤红.基于电导法水平管环状流液膜厚度测量系统设计[D].天津:天津大学,2016.