CAJ | 학술논문

煤层气水平井产气峰值大小及到来时间是产能高低的重要标志，由于国内缺乏具有较长稳定产气历史的煤层气田而鲜有相关研究。以澳大利亚 M 煤层气田为研究对象，首先分析了峰值大小和到来时间的分布特征，发现峰值大小与峰值到来前的平均日产气呈现极好的相关性，且高产井峰值到来时间基本都低于600天。其次，通过数值模拟研究，得出含气饱和度、割理孔隙度、储层厚度、解吸时间、含气量和渗透率对峰值大小的影响依次增大；而峰值到来时间仅受解吸时间及割理孔隙度影响显著。研究成果为项目后续的单井产能评价工作奠定了基础。
매층기수평정산기봉치대소급도래시간시산능고저적중요표지，유우국내결핍구유교장은정산기역사적매층기전이선유상관연구。이오대리아 M 매층기전위연구대상，수선분석료봉치대소화도래시간적분포특정，발현봉치대소여봉치도래전적평균일산기정현겁호적상관성，차고산정봉치도래시간기본도저우600천。기차，통과수치모의연구，득출함기포화도、할리공극도、저층후도、해흡시간、함기량화삼투솔대봉치대소적영향의차증대；이봉치도래시간부수해흡시간급할리공극도영향현저。연구성과위항목후속적단정산능평개공작전정료기출。
The peak gas rate and the time it reaches are two important indications for coal bed methane (CBM)well gas production curve. While in China,there is few corresponding stud-ies because of no long-time production CBM gas fields. This paper takes M CBM gas field of Aus-tralia as research object. Firstly,the peak gas rate and the producing time before it comes of pro-duction wells are researched,it is found that the peak gas rate shows very excellent accordance with the average daily gas rate before it gets to the peak,which gives people important inspiration for CBM well productivity evaluation. Secondly,numerical simulation method is taken to further study influencing factors of the peak gas rate and the time it reaches. The results show that the influencing sensitivity intensity from strong to weak is permeability,gas content,desorption time,net coal thickness,cleat porosity and gas saturation. The time when peak gas production reaches is only markedly influenced by the value desorption time and cleat porosity,The research results can be served as firm foundation for the whole project's subsequent EUR evaluation.