摘要
确定单一煤储层煤层气直井合理日产气量可为煤层气井布井及经济评价提供依据。根据等温吸附、水气启动压力梯度流动等理论,建立了单一煤储层条件下煤层气直井合理日产气量的数理模型,研究了平均日产气量与主控影响因素间的关系。研究表明:渗透率、临储压力比与平均日产气量呈指数形式变化;含气饱和度与平均日产气量呈线性关系。沁水盆地中南部煤层气实际排水采气资料与预测结果的对比验证了模型的准确性。该研究结果为现场煤层气直井选址及经济评价提供了理论依据。
The determination of reasonable daily production in CBM vertical well with mono-coal reservoir could provide a basis for CBM well deployment and economic evaluation. According to isotherm adsorption,fluid flow mechanism with gas-water starting pressure gradient and other theories,a mathematical model to determine the reasonable daily production of vertical well with mono-coal reservoir is established to study the effects of main controlling-factors on daily production. Research shows that the critical-desorption-reservoir pressure ratio varies exponentially with daily CBM production and gas saturation varies linearly with daily CBM production. The model validity is confirmed by the comparison between field gas recovery data by water drainage and forecast in the central-southerncoal reservoir of Qinshui Basin. This research could provide certain theoretical reference for field vertical CBM well deployment and economic evaluation.
出处
《特种油气藏》
CAS
CSCD
北大核心
2016年第3期136-139,158,共4页
Special Oil & Gas Reservoirs
基金
河南省高校科技创新人才项目"低渗煤层水平井分段氮气伴注压裂关键技术研究"(15HASTIT050)
河南省科技厅攻关项目"井下长钻孔分段水力压裂增透关键技术"(142102210050)
关键词
煤层气
日产气量
渗透率
临储压力比
沁水盆地
CBM
daily CBM production
permeability
critical-desorption-reservoir pressure ratio
Qinshui Basin
