Special static contact probe for hydrate reservoirs

Abstract

The invention belongs to the field of geotechnical investigation instruments and equipment, and provides a special static contact probe for hydrate reservoirs to solve the problem that the accuracy ofthe two-bridge/three-bridge static contact probe cannot meet the requirements of accurate predicting of the hydrate distribution law in the reservoirs. The probe comprises a cone tip, a hole pressureconnector, a permeable stone, a cone tip sleeve, a water permeable hole, a hole pressure sensor, a side wall friction cylinder, a hollow top column, a cone tip resistance sensor, a side pressure cylinder, a side pressure sensor, an electrode holder sleeve, a resistivity electrode, a plastic ring, a camera hole, a camera, a bearing seat sleeve, a cable connector, and a connector sleeve. The probecan not only measure the cone tip resistance, side wall friction and pore water pressure, but also measure the geotechnical resistivity and obtain the image data of a penetration path. Moreover the probe can accurately predict the distribution law of the hydrate in the reservoirs, and link the engineering geological parameters of the hydrate reservoirs to the hydrate, which provides new ideas forthe accurate description of the engineering geological parameters of marine gas hydrate reservoirs.

Description

technical field [0001] The invention relates to the field of testing and evaluation of engineering geological parameters of marine natural gas hydrate reservoirs, in particular to a five-bridge static penetrating probe capable of simultaneously satisfying the engineering geological characteristics of hydrate reservoirs and the detection of hydrate distribution rules. Background technique [0002] As a new, efficient and environmentally friendly energy source, natural gas hydrate is widely distributed in terrestrial permafrost zones and deep-sea sediments, of which more than 90% occur in deep-sea sediments on continental margins and continental slopes, and more than 90% of marine natural gas hydrates The substance occurs in the muddy silt or silt of the seabed. The engineering geological risk assessment faced by the trial production of natural gas hydrate in sea areas is still one of the main problems in the process of industrialization. Therefore, accurately obtaining the c...

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Problems solved by technology

[0006] In view of the above-mentioned problems that the accuracy of the existing two-bridge / three-bridge static CPT probes cannot meet the requirements for fine description of reservoir hydrate distribution rules, the present invention provides a special static CPT probe for hydrate reservoirs, which can not only measure Cone tip resistance, side wall friction and pore water pressure can also measure the resistivity of rock and soil and obtain image data of the penetration path, which is more practical

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