CAJ | 학술논문

排水采气是煤层气开发技术的重要流程，直接关系到煤层气井投资的成败。本文根据煤层气井排采原理，分析了煤层气的产出过程，介绍了煤层气单井排采和井网排采的原理，并根据排采过程中产能变化，将排采划分为排水降压阶段、产量稳定阶段、产量衰减阶段等三个阶段。影响煤层气井产能的主要因素有煤储层压力、煤层厚度以及煤储层渗透率等。通过煤层气井产能的数值模拟，可以对煤层气井进行产能预测研究。
배수채기시매층기개발기술적중요류정，직접관계도매층기정투자적성패。본문근거매층기정배채원리，분석료매층기적산출과정，개소료매층기단정배채화정망배채적원리，병근거배채과정중산능변화，장배채화분위배수강압계단、산량은정계단、산량쇠감계단등삼개계단。영향매층기정산능적주요인소유매저층압력、매층후도이급매저층삼투솔등。통과매층기정산능적수치모의，가이대매층기정진행산능예측연구。
Gas recovery by water drainage is an essential process for CBM production technology ,which directly concerns the success or failure of CBM well investment .By analysis of CBM production process ,the paper intro-duces the principles of single well and well pattern drainage ,classifies the drainage into the following three sta-ges:drainage decompression stage ,stable production stage and production attenuation stage according to the pro-ductivity changes affected by the pressure ,thickness and permeability of coal reservoir ,and makes the productivi-ty prediction of CBM well by numerical simulation .