Device and method for monitoring sand grain lateral migration rule for natural gas hydrate mining well

Abstract

The invention discloses a device for monitoring a sand grain lateral migration rule for a natural gas hydrate mining well. The device comprises a metal tube module, wherein one end of the metal tube module is sequentially connected with a displacement pump and a liquid supply module through pipelines, a gas supply module is connected onto the liquid supply module through the a pipeline, and the other end of the metal tube module is sequentially connected with a pressure return module, a solid separation module and a pretreatment module through the pipelines; the metal tube module is further connected with a data measurement and collection module which is connected with the gas supply module and the solid separation module. The invention further discloses a method for monitoring the sand grain lateral migration rule for the natural gas hydrate mining well. With the adoption of the method, testing technology and experimental data support can be provided for research of sand grain migration mechanism induced by hydrate depressurizing mining, great significance on prolonging of duration time for hydrate trial mining is achieved, and the development of a commercial hydrate mining technology is promoted.

Description

technical field [0001] The invention belongs to the technical field of unconventional oil and gas reservoir development engineering, and in particular relates to a monitoring device for the law of sand grain lateral movement in a natural gas hydrate production well, and also relates to a method for monitoring the law of sand grain lateral movement in a natural gas hydrate production well. Background technique [0002] Natural gas hydrate is considered to be one of the important alternative energy sources in the 21st century, which has attracted extensive attention from government departments and scientific research institutes at home and abroad. In recent years, scholars at home and abroad have paid special attention to the research on hydrate mining technology, and have proposed technologies such as heat injection method, depressurization method, chemical reagent injection method, displacement method and solid method. Among them, the depressurization method reduces the pore...

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Problems solved by technology

Scholars at home and abroad have developed several sets of indoor simulation experimental devices for the research of hydrate mining technology, focusing on the experimental simulation of gas and water production from hydrate decomposition and changes in parameters such as temperature, pressure, and hydrate saturation. The simulation of sand migration process induced by hydrate mining has been carried out, and the supporting experimental test methods for hydrate mining-induced sand migration have not been reported, which seriously limits the development of technical problems in the hydrate mining process ("sand production problem"). Due to the simulated experimental work, the experimental data cannot directly serve the hydrate exploitation

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