日本海域天然气水合物试采结果对比分析

截至目前，只有中国和日本实施了海域天然气水合物的试采，了解日本的海域水合物试采中遇到的问题及其对问题的分析情况，有助于中国下一步的水合物研究和开发工作。为了深入认识日本于2013年和2017年在日本海域南海海槽分别实施的两次试采，介绍了两次试采的部署实施情况及实际产气情况，梳理了日本对两次试采中出现的问题及其针对问题的分析研究成果，对比了两次试采中3口生产井的产气情况。发现日本两次试采都没有解决实际产气与预测结果存在差异的问题，认为加强对水合物储层特征和物理特性的认识是解决上述问题的关键；另外，水合物的生产是一个综合的过程，防砂、压降过程、排水等互相影响，在解决这些问题时应综合考虑，并应寻找稳产需要的各项生产参数的平衡点。

A comparative analysis of offshore gas hydrates production test in Japan

At present, only China and Japan have implemented production test of offshore gas hydrates. The problems and lessons encountered in Japan shall be helpful to the hydrate research and development in China. The deployment, gas production, problem and research in Japanese two production tests completed in 2013 and 2017 in Nankai Trough were summarized, and the gas production of three production wells in two tests were compared. It was found that the two tests failed in solving the problem of the difference between actual and predicted gas production results, for which the characteristics and physical properties of hydrate reservoirs should have been the key issues. In addition, the production of hydrates is so complicated that sand control, decompression, drainage, etc., must be considered comprehensively, and balance between various production parameters required for stable production should be compromised.