关键词: 天然气水合物, 单井热吞吐, 水平井, 神狐海域

Abstract:

In this work, the gas production potential from hydrates at the SH7 drilling site of the Shenhu Area by means of the huff and puff method using a single horizontal well was estimated.3 dimensional numerical model was established based on currently available data from site measurements.The hydrate accumulations in Shenhu Area are similar to Class 3 deposits (involving only a HBL), and the overburden and underburden layers are assumed to be permeable.The simulation results indicate that the hydrate dissociated zone expands around the well, and the hydrate formation occurs during the injection stage of the huff and puff process.Reasonable injection and production rates should be adopted to avoid the over pressurization and depressurization during each huff and puff cycle.Thermal stimulation is shown to have an effect over a limited range around the well. The gas production rate and gas to water production ratio in the Class 3 hydrate deposit at site SH7 in Shenhu Area in this work is not suitable for commercial production.

Key words: 天然气水合物, 单井热吞吐, 水平井, 神狐海域