大牛地气田气井全生命周期采气管柱适应性分析

Adaptability analysis of gas production string in whole life cycle of gas wells in Daniudi gas field

气井投产后随着时间延长,压力、产量会不断降低,其携液能力将逐步减弱,后期需采取各种排液措施方可维持气井正常生产。选择合适尺寸的油管,有利于气井长期保持较好的携液能力,可延缓各种助排措施的时间。以大牛地气田为例,对气井按产量、液气比进行分类,在考虑临界携液流量和井筒压降的基础上,以气井的理论无助排期为主要评价指标,分析不同尺寸管柱在不同类型气井全生命周期中的适应性,为生产实践选择合适的油管提供指导。

After the gas well is put into operation,the pressure and production will decrease continuously,and the liquid carrying capacity will gradually weaken.In the later stage,various drainage measures should be taken to maintain the normal production of gas wells.The selection of proper size tubing is conducive to the gas well to maintain good liquid carrying capacity for a long time,and can delay the time of various drainage assistance measures.By taking Daniudi gas field as an example,the gas wells are classified according to the production and liquid gas ratio.On the basis of considering the critical liquid carrying flow and wellbore pressure drop,the adaptability of different sizes of strings in different types of gas wells in the whole life cycle is analyzed,which provides a good guidance for the selection of appropriate tubing for production practice.