导　　师： 同登科

学科专业： 070104

授予学位： 硕士

作　　者： ;

机构地区： 中国石油大学华东

摘　　要： 通过对煤层气藏赋存运移机理的深入研究,结合油藏中水平井筒与储层耦合的理论,建立了煤层气藏羽状水平井井筒与储层耦合的数学模型,并开发了相应的数值模拟软件。取得的主要成果如下: /(1/)针对煤层气开采经历的解吸、扩散以及渗流等复杂流动过程,建立了双重介质煤层气藏三维、非平衡吸附、拟稳态条件下气—水两相耦合流动数学模型,利用IMPES方法进行数值求解,并将模拟结果与数值模拟软件CMG的结果进行对比,验证了模拟结果的可靠性; /(2/)在考虑煤层气解吸吸附特性的基础上,结合油藏中水平井筒与储层耦合的理论,建立了煤层气藏水平井、羽状水平井井筒与储层耦合的数学模型,利用数值差分的方法进行求解,将直井、水平井和羽状水平井的模拟结果进行了对比,着重研究了羽状水平井中分支数与分支角度对产气量的影响; /(3/)基于低渗透煤层气藏的特点,建立了考虑启动压力梯度项的双重介质煤层气储层水平井开采的数学模型,利用数值差分的方法进行求解,并着重研究了气相启动压力梯度对产气量的影响。 A pinnate horizontal well mathematics model was given in coalbed methane reservoir, considered the coupling of well bore and reservoir. The model based on the coupling theory of horizontal well in oil reservoir and the storage migration mechanisms of coalbed methane. Besides, a corresponding reservoir simulator was developed. The major study of this paper includes: /(1/) A three-dimensional, dual-porosity, pseudo-steady, non-equilibrium sorption, two-phase mathematical model was built, included complex processes of desorption, diffusion and seepage during the exploiting procedure of coalbed methane. The model was numerical solved with IMPES method. And the result was compared with CMG software’s. /(2/) Both horizontal well and pinnate horizontal well mathematics models were built in coalbed methane reservoir, considered the coupling of well bore and reservoir. The models were solved by numerical difference method. And the effect of simulation parameters to gas production was studied, with the emphasis on the branch number and angle. /(3/) Based on the character of low permeability coalbed methane reservoir, a two-phase, 3-D flow model considering the starting pressure gradient of dual-porosity media was established. The model was solved by numerical difference method. And the effect of gas phase’s starting pressure gradient to gas and water production was studied.

关 键 词： 煤层气 羽状水平井 耦合 启动压力梯度 数值模拟

分 类 号： [TD84]

领　　域： [矿业工程] [矿业工程]