Natural gas hydrate decomposition stratum deformation measuring device

Abstract

The invention discloses a natural gas hydrate decomposition stratum deformation measuring device, which is used for being installed in a natural gas hydrate reaction kettle, wherein the reaction kettle is used for simulating a natural gas hydrate geological stratum, and the geological stratum is divided into an upper covering layer, a sediment layer and a lower covering layer from top to bottom. The deformation measuring device comprises a displacement sensor fixing plate, displacement sensors and a flexible elastic panel, wherein the plurality of displacement sensors are evenly distributed, one end of each displacement sensor is fixedly installed in the displacement sensor fixing plate, and the other end of each displacement sensor is telescopic and fixed in the flexible elastic panel ina sealed mode; and the flexible elastic panel is tightly attached to the upper covering layer, and the displacement sensor fixing plate is fixedly installed in the reaction kettle. The natural gas hydrate decomposition stratum deformation measuring device not only can measure stratum deformation caused by large-scale natural gas hydrate decomposition, but also breaks through the limitation of one-dimensional measurement of stratum deformation, and realizes three-dimensional measurement of stratum deformation.

Description

technical field [0001] The invention relates to a measuring device for natural gas hydrate exploitation, in particular to a measuring device for formation deformation of natural gas hydrate decomposition. Background technique [0002] The exploitation of natural gas hydrate will affect the mechanical behavior of the sedimentary layer, which may induce geological disasters such as stratum subsidence and slope slippage. It is a major safety issue facing the exploitation of natural gas hydrate at present. Therefore, it is very important to analyze the mechanical behavior of the hydrate sedimentary layer. important practical significance. At present, most studies on formation deformation of natural gas hydrate decomposition are triaxial experiments. The formation conditions are simulated by applying axial pressure and confining pressure, and then the settlement is calculated through the volume change after hydrate decomposition, and then the formation deformation is analyzed. T...

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Problems solved by technology

This method can effectively analyze the formation deformation, but the scale of the experiment is often relatively small

When the scale of the experiment is enlarged, this method is not applicable. The large-scale decomposition of natural gas hydrate will bring about a large deformation, which is the most difficult point in the current measurement. It is also difficult to reflect the irregularity of deformation with one-dimensional settlement

Facing the large-scale gas hydrate experimental system, the current technical deficiencies are mainly reflected in: the inability to measure large-area formation deformation; the inability to measure large formation deformation; the measurement of formation deformation is difficult to break through the one-dimensional limit

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