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Constant rate natural gas production from a well in a hydrate reservoir

机译：从水合物储层中的一口井以恒定速率生产天然气

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摘要

Using a computational model, production of natural gas at a constant rate from a well that is drilled into a confined methane hydrate reservoir is studied. It is assumed that the pores in the reservoir are partially saturated with hydrate. A linearized model for an axisymmetric condition with a fixed well output is used in the analysis. For different reservoir temperatures and various well outputs, time evolutions of temperature and pressure profiles, as well as the ga's flow rate in the hydrate zone and the gas region, are evaluated. The distance of the decomposition front from the well as a function of time is also computed. It is shown that to maintain a constant natural gas production rate, the well pressure must be decreased with time. A constant low production rate can be sustained for a long duration of time, but a high production rate demands unrealistically low pressure at the well after a relatively short production time. The simulation results show that the process of natural gas production in a hydrate reservoir is a sensitive function of reservoir temperature and hydrate zone permeability.
机译：使用计算模型，研究了从钻入密闭甲烷水合物储层的油井以恒定速率生产天然气的情况。假定储层中的孔隙被水合物部分饱和。分析中使用轴对称条件的线性化模型，其中井输出固定。对于不同的油藏温度和各种井产量，评估了温度和压力曲线的时间演变，以及水合物区和天然气区的ga流速。还计算了分解前沿到井的距离以及时间的函数。结果表明，要保持恒定的天然气生产率，必须随时间降低井压。恒定的低生产率可以长期维持，但是高生产率要求在相对短的生产时间后油井中的压力不切实际。模拟结果表明，水合物储层天然气生产过程是储层温度和水合物带渗透率的敏感函数。

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