涩北一号气田气井分类评价方法研究

STUDY ON GAS WELLS CLASSIFICATION AND ESTIMATION IN SEIBEI THE 1ST GAS FIELD

涩北一号气田是一个多层合采气田,目前共有生产井114口,单井平均日产1.32-7.95×104m3。为了更好地指导气田下步的高效、合理开发,有必要对涩北一号气田气井进行分类评价。通过建立将平均日产气和产气递减率结合起来的分类方法,把气井分为高产井、中产井和低产井,并进一步划分为五类。对每类气井的生产特征分析表明,第一三类气井是保重气田稳产的主力井;第二四类气井产量递减快,应立足于控水采气和均衡采气;第五类气井产量低,应立足于井网调整提高储层动用。

Multi-layer commingling production has been used broadly in Sebei 1st gas field. There are 114 gas production wells with an average output of 0.32-7.95 × 104m3/day/well. It is very important to class and evaluate the gas wells for the gas reservoir exploring efficiently and rationally. By combining the average daily output of gas and gas production decline rate, a new classification method has been established. The gas wells has been classed with high-yield gas wells, middle-yield wells and low-yield wells, and further divided into five categories. Analysis and estimation of each category gas wells showed that 1st and 3rd category gas wells is the main production wells; 2nd and 4th category gas wells whose production decline rapidly should focus on controlling the water output; 5th category gas wells is low-yield wells and so the well net should be adjusted to enhance the gas recovery.