天然气水合物储层水力压裂研究进展

天然气水合物是一种广泛分布于海底地层中重要的未来战略能源,但在开采过程中,由于水合物储层介质颗粒粒径较小,孔隙多被固态水合物占据,储层渗透率低,制约着天然气水合物开采的产业化进程。当今水力压裂技术已广泛应用于低渗透油气藏的增产作业中,本文总结了近年来国内外对天然气水合物储层应用水力压裂技术的研究现状,从压裂实验、数值模拟和压裂液等方面进行了讨论。结果表明,水力压裂可以创造人工裂缝,扩大水合物解离面积,提高储层渗透率和天然气产量,有利于商业开发。储层的脆性响应问题、开发新型压裂液以及压裂对水合物储层地质安全的影响,都是水合物储层水力压裂研究亟待解决的问题。

Research Progress on Hydraulic Fracturing of Natural Gas Hydrate Reservoir

Natural gas hydrate (NGH) is an important future strategic energy widely distributed in the seabed strata. However, the industrialization process of NGH exploitation is restricted due to the small particle size of the hydrate reservoir medium, the pores are mostly occupied by solid hydrate and the low permeability of the reservoir. The hydraulic fracturing technology has been widely used in the production operation of low permeability reservoirs. In this paper, the application of natural gas hydrate reservoir at home and abroad in recent years was summarized, the research status of hydraulic fracturing technology from fracturing experiments, numerical simulation and fracturing fluid, etc., was discussed. Results showed that hydraulic fracturing can create artificial fracture; strategies such as expand the area of hydrate dissociation, improve reservoir permeability and gas production were conducive to business development. The brittle response of reservoir, the development of new fracturing fluid and the influence of fracturing on the geological safety of hydrate reservoir are all the problems to be solved urgently.