Simulation device and method for coupling process of sand production-mechanical parameters in hydrate-bearing sediments

Abstract

The invention relates to the technical field of marine gas hydrate resource development engineering, in particular to an indoor experimental device and method for evaluating the mutual coupling relationship between the shakeout process and mechanical parameters of hydrate-containing loose sediments. The device comprises a high-pressure reaction kettle, a thermostatic control system, a triaxial pressurizing system, a confining pressure control system, a pore pressure injection system and a shakeout parameter test system, wherein the confining pressure control system, the pore pressure injection system and the triaxial pressurizing system are connected with the high-pressure reaction kettle; and the shakeout parameter test system is connected with the outlet end of the high-pressure reaction kettle. Through measurement of the mutual coupling relationship between shakeout parameters, such as the shakeout amount, the shakeout grain size and the shakeout speed of the hydrate sediments, under the actual temperature, pressure and stress conditions, and triaxial mechanical parameters, such as the stress-strain curve, the shear strength, the Yong modulus and the cohesion, a support is provided for forecasting the related relationship between the shakeout parameters and the mechanical parameters of a hydrate-containing reservoir, and a new concept is provided for probing into the shakeout mechanism of the natural gas hydrate reservoir.

Description

technical field [0001] The invention relates to the technical field of marine natural gas hydrate resource development engineering, in particular to an indoor experimental device and method for evaluating the mutual coupling relationship between the sand production process and mechanical parameters of loose hydrate-containing sediments. Background technique [0002] Natural gas hydrate resources are an important alternative energy source characterized by wide resource distribution and high energy density. In recent years, the international research focus on natural gas hydrate has shifted from natural gas hydrate exploration to natural gas hydrate trial production. According to the experience of international natural gas hydrate trial production, the depressurization method is currently the best natural gas hydrate production method recognized globally, but the decompression method will inevitably face contradictions and balances between production capacity and sand productio...

AI Technical Summary

Problems solved by technology

However, the reaction kettle disclosed in this patent cannot simulate the sand production process, so the influence of the sand production process on the strength parameters of hydrate-containing sediments cannot be simulated.

Patent Publication Nos. CN205786187U, CN106353069A, etc. respectively announced the monitoring method of the sand production parameters of the hydrate reservoir under the one-dimensional seepage condition and the monitoring method of the microscopic migration mechanism of the formation sand grains, but these methods all assume that the formation sand production is caused by the fluid carrying effect Therefore, the influence of the change process of reservoir strength parameters on sand production parameters under the actual formation stress conditions is not considered

In summary, the current independent research on the sand production process and triaxial mechanical parameters of loose hydrate-bearing sediments cannot solve the coupling relationship between sand production and mechanical parameters faced in actual engineering, and the research ideas and methods cannot meet the needs of mines. Field Practice Requirements

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