气井产量曲线递减趋势影响因素及产量预测

Factors Affecting Production Decline Performance and Production Forecasting

油气田产量的变化要经过产量上升—产量稳定—产量下降的全过程。常规气井经过投产以后,产量稳定到一定时期就进入到递减阶段,预测此阶段的产量,对开发方案的调整、地面工程建设、气井的经济评价、增产措施的决策等具有重要意义。在近年来油气井产量递减研究成果的基础之上,研究了不同Arps产量递减曲线的关系,得出了常规气井产量递减符合双曲线递减,总结了影响气井产量递减的主要因素,分析了这些因素的改变对产量递减曲线趋势变化的影响,并通过气井递减曲线变化的趋势来指导气井递减阶段的产量预测。

The change of oil-gas field production experiences the process of rise, stability, and decline. After a conventional gas well goes into production, production remains stable for a certain period of time then comes to a declining stage. Forecasting for this stage of production has an important sense for the adjusting of exploration and exploitation design, surface construction, economic evaluation of the gas well and increasing production measure decisions, and so on. Based on the research of oil-gas wells production decline in recent years, this paper studied about the relationship of the three Arpsls production decline curves, came to the conclusion of production decline following a hyperbolic decline, summed up the major factors impacting the production decline of gas wells, analyzed the effect on production decline performance by the change of these factors, and used the production decline curves to forecast the descending phase of gas well production.