新疆阜康白杨河矿区煤层气井排采产水特征研究

Study on Water Production Characteristics of CBM Wells in Baiyanghe Mining Area of Fukang in Xinjiang

为了研究新疆白杨河矿区煤层气生产井排采产水对产气效果的影响,开展了煤层气井排采过程中的产水特征研究。分析了煤层气井在低产水和高产水两种产水模式下煤层气排采过程中的压力传播边界、及其对煤层气井产气的影响。分析结果表明:阜康白杨河矿区中、西部高产水煤层井储层压降在近井地带迅速消耗,难以形成持续有效扩展的降压漏斗,产量在达到一个高峰后快速降低,不利于高产、稳产。示范区东部低产水煤层井排采过程产气持续稳定,部分井产气量很高,说明白杨河矿区低产水有利于降压漏斗的持续扩展。

In order to study the effect of water production from CBM wells in Baiyanghe Mining Area of Xinjiang on the effect of gas production,the characteristics of water production in the CBM well drainage process are studied.The pressure propagation boundary of CBM in the process of CBM drainage and its influence on gas production in CBM wells are analyzed under two water production modes of low production and high production.The analysis results show that the reservoir pressure drop of wells in the west with high water production in Baiyanghe Mining Area of Fukang is rapidly consumed in the near-wellbore area,and it is difficult to form a pressure-relief funnel that is continuously and effectively expanded.The output rapidly decreases after reaching a peak,which is not conducive to high-yield and stable production.The gas production in the wells in the eastern part of the demonstration area with low water production continues to be stable,and the gas production in some wells is high,indicating that the low-yield water in Baiyanghe Mining Area is conducive to the continuous expansion of the buckling funnel.