Secondary hydrate formation monitoring and inhibiting system based on multi-branch well and method thereof

Abstract

The invention discloses a secondary hydrate formation monitoring and inhibiting system based on multi-branch wells and a method thereof. The secondary hydrate formation monitoring and inhibiting system based on the multi-branch wells comprises a multi-branch well development system, an injection module, a temperature control module, a hydrate reaction kettle, a monitoring module, a data acquisition unit and the like. The multi-branch well development system is arranged in the hydrate reaction kettle, and the injection module, the monitoring module and a product collection module are all connected with the data acquisition unit. The system design can monitor the secondary hydrate formation in branch horizontal wells during hydrate mining under different combination conditions of the horizontal wells and study the optimal temperature rise range of a water bath clamp cover on the outer wall of the branch horizontal wells after formation of secondary hydrate during hydrate mining in the branch horizontal wells, so that the purposes of effectively inhibiting blockage of the branch horizontal wells and improving production efficiency are achieved, secondary hydrate formation monitoring and inhibiting is achieved, and important guiding significance is made for efficient and safe hydrate mining.

Description

technical field [0001] The invention belongs to the field of hydrate reservoir development technology and its flow safety assurance technology, and in particular relates to a secondary hydrate formation monitoring and suppression system and method based on a multi-branch well. Background technique [0002] Hydrate reserves in the sea are formed by natural gas and water through a long geological environment under low temperature and high pressure conditions, and usually occur in sediments within a depth of 300 meters below the seabed. The exploitation of natural gas hydrate has become a research hotspot in unconventional oil and gas reservoir engineering. Due to the low temperature and high pressure of hydrate itself, the development of hydrate reservoirs at this stage is mainly through the decompression method, heat injection method, inhibitor method and new Mining methods (such as CO 2 Replacement method, etc.) to achieve. Among all mining methods, the depressurization me...

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Problems solved by technology

During the field test of natural gas hydrate production, due to the limitations of the existing gas-liquid separation technology, it is impossible to completely contain methane in the water production pipeline; Seawater may regenerate hydrate, and when the hydrate content increases to a certain level, the pipeline will be blocked, causing the bottom hole pressure of the production well to drop and fail, which in turn will cause the hydrate trial production to be forced to stop

At present, there are few reports on experimental devices designed for the risk assessment of hydrate secondary generation plugging production well pipes, which severely limits the experimental simulation work of risk assessment of hydrate secondary generation plugging production well pipes. There are still problems in hydrate production. threat of clogging

[0004] So far, only two countries, Japan and China, have carried out trial production of hydrates in sea areas, and both of them use the vertical well depressurization method for production. The benefits are still low, and the current mechanism of natural gas hydrate production is still insufficiently understood, especially in the risk assessment of the secondary generation of hydrates during the production process to block the production well pipe, which cannot meet the actual needs of the project

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