苏里格气田气井废弃产量预测

气井废弃产量是气田开发的一项重要技术经济参数,也气田最终采收率预测的主要依据,而该参数的确定一直停留在静态方法计算阶段。然而,气井生产时间一般长达十多年甚至几十年,目前采用的静态计算方法与气井生产实际存在差异。为了确定苏里格气田各类气井生产经济寿命期,在油藏工程方法预测气井产量变化规律的基础上,对该气田不同类型井采用类比方法预测了气井20a采气成本以及相关费用;运用现金流法分别计算了Ⅰ、Ⅱ、Ⅲ类井的废弃产量和气井经济废弃时间。结果表明:Ⅰ类井经济生产期大于20a;Ⅱ类井经济生产期为16a,废弃产量为0.102×104m3/d;Ⅲ类井经济生产期为8a,废弃产量为0.11×104m3/d。研究成果为该气田不同类型气井生产寿命的确定和对策制定以及不同类型气井最终经济可采储量的确定提供了依据。

Prediction of gas well abandonment production in the Sulige Gas Field

The abandonment gas production of a gas well is an important technical and economic parameter for the gas field development, being the main basis for the final recovery factor prediction of a gas well. However, this parameter is always determined by the static method at present, the result of which can not reflect the actual production performance of a gas well after one to many decades. In this paper, in order to determine the life cycle of different types of gas wells in the Sulige Gas Field, we first predict the regularity of the gas well production by means of reservoir engineering methods, then forecast the costs and expenses of the gas well development for twenty years by the analogy method, and finally calculate the abandonment production and economic abandonment time of type Ⅰ， Ⅱ, and Ⅲ of gas wells by the cash flow method. The calculated results indicate that under the present technical and economic conditions, the gas well type Ⅰ can be developed for more than twenty years; Type Ⅱ can be developed for 16 years and its abandonment production is 0.102×104m3/d; type Ⅲ can be developed for eight years and its abandonment production is 0.11×104m3/d. These results provide solid basis for the determination of productive life, development strategy and final economic recoverable reserves for different types of gas wells in the Sulige Gas Field.