Multi-type hydrate generation monitoring test method

Abstract

The invention discloses a multi-type hydrate generation monitoring test method. A gas consumption metering module, a multi-type hydrate sample preparation module, a resistivity parameter test module,and an acoustic parameter test module are designed, conditions for simulating the environmental pressure and temperature, the sediment filling mode and gas-liquid ratio are designed, and multi-type natural gas hydrate reservoirs are synthesized; with the electrical resistance tomography technology, three-dimensional distribution of hydrates in the core is detected to realize internal visualizationof the core; and an acoustic wave tester detects longitudinal and horizontal waves of the core of the hydrate sediment core to obtain a relationship between acoustic wave velocities and hydrate distribution of different types of hydrate reservoirs. Therefore, the test method has the important significance in understanding the physical parameters of occurrence states being different types of reservoirs of the natural gas hydrates in nature correctly and establishing an accurate quantitative relationship between the hydrate saturation and basic physical properties of the reservoir.

Description

technical field [0001] The invention belongs to the engineering technical field of exploration and development of marine natural gas hydrate resources, and in particular relates to a multi-type hydrate generation monitoring and testing method. Background technique [0002] Natural gas hydrate is mainly distributed in seabed sediments in two forms of pore-filling and fracture-filling in nature, and it is an important potential energy source. So far, there are two main methods for preparing hydrate core samples in the laboratory: in-situ generation method and hybrid compression method. The former is generated in situ in an autoclave by simulating the seabed environmental conditions, but this generation method Basically, all pore-filling hydrate core samples were generated; the latter were pressed by mixing different proportions of pure hydrate and sediment. How to generate fracture-filling hydrates, such as massive, vein-like, and nodular hydrate samples, has not been reporte...

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Problems solved by technology

[0003] At present, there are many experimental devices and methods for preparing hydrate-containing sediment samples and measuring their physical parameters in the laboratory; for example, the invention patent ZL201710303350.9 discloses a CT-specific hydrate resistivity measuring device and method, which can be used in X -Measure the resistivity of hydrate-containing deposits while performing CT scanning. The device is small in size, with a diameter of only 2cm; the utility model patent ZL201820344769.9 discloses the use of Electrical Resistance Tomography (ERT) technology to detect fractured natural gas Hydrate dynamic monitoring device, the ERT used in this device is a mature technology of iTS company, which can only monitor the resistivity change of two sections, and cannot form a three-dimensional image of hydrate core; the invention patent ZL201610071504.1 provides a method for measuring water content The device and method of seismic wave velocity and electromagnetic attenuation in composite sedimentary medium are realized by the principle of resonant column

[0004] The existing gas hydrate experimental devices and physical parameter measurement methods mainly have the following defects: (1) The sediment samples used in CT experiments are relatively small, and it is difficult to carry out multi-type hydrate-scale experiments; (2) the comparison of measurement parameters Single, and the resolution accuracy of the obtained data is low; (3) The ERT used is a commercially mature technology, which can only measure the resistivity of two sections, and it is difficult to realize the three-dimensional visual observation of the entire core

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