The present invention provides a
system and a process method for the segmented
recovery of marine
natural gas hydrate horizontal wells. The segmented
recovery subsystem realizes sequential
recovery of the corresponding stages in spatial positions from the
toe end to the root end of the horizontal section in accordance with the recovery sequence through a mobile recovery
system. The foam lifting subsystem injects high-pressure gas and
foaming agent into the production
wellbore to realize the transformation of the flow
system in the production
wellbore into a foam flow system. The platform
processing subsystem processes the output of the production
wellbore to realize the separation of gas, liquid and
solid. According to the stage division of the horizontal section of the marine
natural gas hydrate horizontal well, the production capacity of the production stage, risk monitoring and analysis, sand cleaning of the production system and return to the adjacent upstream stage of production, and the complete recovery and evaluation optimization of the production system, the process method realizes the fine
processing of the heterogeneity of the
hydrate reservoir in space, and the coordinated
processing of the production capacity and risk in time, thereby significantly reducing costs and increasing efficiency.