Simulated experiment testing method of gas hydrate in porous medium

Abstract

The invention discloses a simulated experiment testing method of gas hydrate in a porous medium. The method mainly comprises an experimental and measured data acquiring step and a measured signal analysis processing step, and specifically comprises generating the gas hydrate in the porous medium in a reaction vessel, increasing temperature step by step, decomposing the gas hydrate, acquiring the temperature, the pressure, and the electric and acoustic signals of different test points in a decomposition process, computing the saturation of the gas hydrate according to the temperature and the pressure, and establishing gas hydrate saturation models based on acoustic characteristics, electric characteristics, and acoustoelectric fusion characteristics respectively. The acoustoelectric combined test method achieves safe and radiation-free signals and low system interference, provides an effective detection technical means for the research of the dynamics law of a natural gas hydrate generation / decomposition process and a spatial distribution state change rule of phase materials in the porous medium, and provides a theoretical base for development of new logging technology.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration, in particular to an exploration technology of natural gas hydrate reservoirs, in particular to a gas hydrate simulation test method in porous media. Background technique [0002] Gas hydrate is an energy resource with great potential, mainly distributed in land permafrost and seabed sediments on the edge of the continental shelf. It has the characteristics of wide distribution, large reserves, high energy density, and cleanness. The exploration and development of resources has attracted extensive attention from all over the world. [0003] Gas hydrate reservoirs are a special type of reservoirs. At present, their evaluation mainly follows oil and gas evaluation theories and methods, that is, gas hydrates are treated as fluids. In fact, natural gas hydrate exists in solid form, and its physical and chemical properties, occurrence state, and accumulation mode are quite different fr...

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Problems solved by technology

The patent with the application number 2013102252657 announced "Experimental device and method for dynamic triaxial mechanical-acoustic-electrical simultaneous testing of natural gas hydrate deposits", but its testing system and method have the following characteristics: traditional resistivity testing technology is used, That is, only the resistance information of the measured medium is obtained and the capacitive reactance information is ignored; only a pair of electrodes is used as the sensor, and the test space range is narrow; the combination of the electrical sensor and the acoustic sensor in the test space is not considered, resulting in the acoustic sensor and the electrical sensor. The test objects (spatial test range) of the sensors are not completely consistent, which leads to the inability to unify the information obtained by the two types of sensors, and the joint (fusion) processing of the measurement data of the two types of sensors cannot be performed.

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