煤层气采收率的影响因素及确定方法研究

AFFECTING FACTORS AND ESTIMATING METHODS OF RECOVERY PERCENT OF COAL-BED GAS

煤层气可采资源量是各界人士广为关注的问题,而可采资源量计算的关键是如何确定煤层气采收 率。文章从煤层气采收率的影响因素入手,通过对气藏地质特征、开发技术、经济因素等因素的分析,根据各种因 素及其综合作用的结果,提出了5种确定煤层气采收率的方法。首先可以根据解吸实验数据来计算;其次对有生 产或试验井网的地方,可以通过生产数据的历史拟合来模拟计算煤层气采收率;第三可以通过物理模拟方法确定 煤层气采收率或结合历史拟合来模拟计算;最后可以参考国内外有关文献资料和研究成果,通过地质等类比确定 煤层气采收率。

The recoverable resource volume of coal-bed gas is the issue the people in the different fields pays attention to commonly. The key to estimate the recoverable resource volume is how to determine the recovery percent of coal-bed gas. According to the affecting actors of the recovery percent of coal-bed gas, by analyzing the factors of the geological features of gas reservoirs, the recovering techniques and the economic conditions etc., based on the different factors and their integrated effect, 5 methods are proposed to determine the recovery percent of coal-bed gas: ① It is calculated by the experimental data of desorption; ② It is calculated by simulation with the historical fitting of production data where there are production or test well nets; ③ It is determined by physical simulation; ④ It is calculated by physical simulation combining the historical fitting; ⑤ It is determined by geological analogy method according to the relative documentation and the research results at home and abroad.