A device for monitoring physical property changes of hydrate reservoirs during deepwater drilling fluid invasion

Abstract

The invention relates to a device for monitoring physical property change of a hydrate reservoir in the deep water drilling fluid invasion process. The device comprises a shaft-hydrate reservoir coupling heat and mass transfer unit and a drilling fluid circulating unit. The shaft-hydrate reservoir coupling heat and mass transfer unit simulates a reservoir structure by adopting a sand filling compaction method, a reaction place is provided for generation, decomposition and regeneration of hydrate in a porous medium, and multiple monitoring means including temperature and pressure sensing, electrical impedance sending, ultrasonic wave monitoring, TDR monitoring and nuclear magnetic resonance tracing isotope are utilized to record physical property parameter changes at different positions in the reservoir in real time. The drilling fluid circulating unit is used for simulating drilling fluid circulation of different drilling parameters. The device can simulate the hydrate reservoir under different water depth conditions and monitor the changes of temperature, pressure and electrical impedance in the reservoir during shaft-reservoir heat and mass transfer and migration regularity of decomposition fluids, original solid-phase hydrate and other substances.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas development, and in particular relates to a device for monitoring physical property changes of hydrate reservoirs during deepwater drilling fluid invasion, which is used for observing and analyzing dynamic changes in the internal behavior of drilling fluids intruding into hydrate reservoirs under different conditions. So as to summarize the corresponding rules. Background technique [0002] Hydrate is a cage structure complex, usually composed of small molecular hydrocarbons (such as methane, ethane, propane, n-butane, etc.) and water molecules. It has the advantages of abundant reserves, wide distribution, high energy density, and low pollution after combustion. It is regarded as a clean energy that can replace traditional fossil fuels in the future, and has been sought after and concerned by countries all over the world. Many countries have successively carried out gas hydrate trial pro...

AI Technical Summary

Problems solved by technology

However, the research on heat and mass transfer in hydrate reservoirs is still immature, and the understanding of the behavior and dynamics of drilling fluids after intrusion into hydrate reservoirs is almost blank.

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