Patent ID: 11952869
Assignee: CHINA UNIVERSITY OF PETROLEUM (EAST CHINA)
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 4:
5. The high-efficiency yield-increasing exploitation method for the natural gas hydrates according to claim 4, wherein in step (ii), an injection rate of the foam cement slurry is as follows:

Vfc≥2L1·L2·H·Sf  (8)

wherein Vfc is a volume of the foam cement slurry to be injected into the natural gas hydrate reservoirs, m3; L2 is a length of the horizontal well section, m; H is a thickness of the natural gas hydrate reservoirs, m; and Sf is a porosity of the natural gas hydrate reservoirs subjected to fracturing for fracture forming, which is dimensionless.