摘要
积液问题严重影响雅克拉—大涝坝深层凝析气藏气井的正常生产,常用积液预测方法在雅克拉—大涝坝深层凝析气藏的适用性亟需进一步论证。对临界携液流量法和动能因子法的适用性进行了评价与优选研究。阐述各积液预测方法的基本原理与差异,考虑临界携液流量和表面张力沿井筒的动态分布,对原始临界携液模型进行改进;通过误差分析,分别选取适合于该气藏高、低气液比气井的井筒温压计算模型;通过实例分析,优选出适用于深层凝析气藏气井的积液预测方法。结果表明,修正的拟单相流温压耦合计算模型适用于该气藏高气液比气井井筒温压计算,Hagedorn-Brown方法和Hasan方法适用于低气液比气井井筒温压计算。改进的临界携液流量模型与原始模型相比,提高了积液预测精度。改进的李闽模型和界限值取为6的动能因子法积液预测精度较高,适用于雅克拉—大涝坝深层凝析气藏气井的积液预测。
Liquid loading is a serious problem for normal production of gas wells in Yakela-Dalaoba deep condensate gas reservoir. The applicability of common methods for predicting liquid loading still needs to be demonstrated. The applicability of critical rate method and kinetic energy factor method is evaluated and opimized. The fundamental principles of each method for predicting liquid loading and differences among them are introduced. Different dynamic distribution of critical rate and surface tension along wellbore are considered in order to improve original critical rate models. Through error analysis, the methods suitable for calculating temperature and pressure distribution in high and low gas-liquid ratio wellbores of Yakela-Dalaoba gas reservoir are optimized respectively, and such methods suitable for predicting liq- uid loading are given through field case study. Results show that modified pseudo single-phase coupling model is suitable for calculating tem- perature and pressure distribution in high gas-liquid ratio wellbore, while Hagedorn-Brown method and Hasan method are suitable for it in low gas-liquid ratio wellbore of Yakela-Dalaoba gas reservoir. The improved critical rate models increase precision of liquid loading prediction compared to original models. The improved Li Min model and kinetic energy factor method that sets threshold value as 6 are of the high- est precision, and both of them are suitable for predicting liquid loading of gas wells in Yakela-Dalaoba deep condensate gas reservoir.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2015年第6期743-747,共5页
Xinjiang Petroleum Geology
基金
国家科技重大专项(2011ZX05009-005)
中国石化技术开发项目(34400004-14-ZC0607-0001)
关键词
塔里木盆地
雅克拉一大涝坝凝析气藏
凝析气井
积液预测
临界携液
动能因子
Tarim basin
Yakela-Dalaoba condensate gas reservoir
condensate gas well
liquid loading prediction
critical rate
kinetic energy factor
