气井气液两相管流压降计算模型评价与优选

目前工程上常用的气液两相管流压降计算模型建立的基础不同,其适用条件均具有一定的局限性。特别是含水气井,不同气水比时,气井井底流压计算结果差异大,影响气井生产动态分析和优化的准确性。鉴于此,文中整理了国内外102组气井生产实测数据,对8种常用气液两相管流压降模型进行评价与优选。结果表明:气水比大于2 441 m~3/m~3时,Hagedorn-Brown模型和Gray模型计算结果与实测数据最吻合,平均相对误差最小;气水比小于2 441 m~3/m~3时,Beggs-Brill模型计算结果与实测数据最吻合,平均相对误差最小。因此,气水比大于2 441 m~3/m~3的气井推荐使用Hagedorn-Brown模型或Gray模型计算,气水比小于2 441 m~3/m~3的气井推荐使用Beggs-Brill模型计算。

Evaluation and optimization of pressure drop calculation models for gas-liquid two-phase pipe flow in gas well

Currently,the commonly used pressure drop calculation models of gas-liquid two-phase flow were established on different foundations,which show limitations in suitability,especially for water-bearing gas wells.The calculation results of gas well bottom hole flowing pressures difter greatly under different gas water ratios(GWR),which influence the accuracy of the dynamic analysis and optimization of gas well production.In this paper,eight commonly used two-phase pressure drop models were evaluated and optimized by the analysis of 102 groups of gas well production data in China and abroad.The results show that the Hagedom-Brown model and Gray model are the most consistent with the test data with minimu average relative errors when gas water ratio exceeds 2 441 m3/m3;when gas water ratio is less than 2 441 m3/m3,the Beggs-Brill model is the most consistent with the test data with minimum average relative error.As a conclusion,Hagedorn-Brown model and Gray model are recommended for gas wells with high GWR (＞2 441 m3/m3) and Beggs-Brill model is recommended for gas wells with low GWR (＜2 441 m3/m3).