Natural gas hydrate cave well completion evaluating and testing device and method

Abstract

The invention discloses a natural gas hydrate cave well completion evaluating and testing device which comprises a reaction still system, a cave well completion system, a confining pressure control system, an inlet pressure control system, an outlet pressure control system, a gas-liquid-solid separating system, a temperature control system and a data collecting and processing system. The reactionstill system is used for simulating in-situ generation, cave well completion and extraction of natural gas hydrate; the temperature control system provides a constant temperature environment for the device; the cave well completion system, the confining pressure control system, the inlet pressure control system, the outlet pressure control system and the gas-liquid-solid separating system are usedfor controlling the pressure and flowing state of the experiment process; and the data collecting and processing system is used for collecting and processing the parameters of the experiment process.The invention further relates to a natural gas hydrate cave well completion evaluating and testing method. According to the natural gas hydrate cave well completion evaluating and testing device andmethod, cave well completion testing can be carried out on a hydrate-containing rock core synthesized artificially, and the device and method are used for evaluating the cave well completion conditionof the hydrate.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate development, in particular to a natural gas hydrate cave completion evaluation testing device and method. Background technique [0002] Gas hydrates are widely distributed in deep sea sediments or terrestrial permafrost, with huge reserves, twice the total carbon content of conventional fuels in the world, and are a potential future energy source. [0003] However, hydrate reservoirs have complex structures, low permeability, complex mineral composition, and complex temperature and pressure. Therefore, there may be problems such as low productivity and sand production during the development of hydrate reservoirs. The gas production of reservoirs after cave completion is 3-20 times of hydraulic fracturing after perforation completion, and the cost is lower than large hydraulic fracturing. Therefore, the use of cave completion technology to collapse the target reservoir to expand the we...

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Problems solved by technology

[0004] However, for hydrate development, cave completion is a brand-new technology, so the mechanism of cave completion for diagenetic or high-strength hydrate reservoirs is still unclear, and the implementation effect has not been effectively evaluated

At the same time, due to the large capital investment, long operation time, and many uncertain factors in the field test of hydrate cave completion, and it is difficult to evaluate and explain the production stimulation mechanism after the completion of the on-site cave, therefore, the current research on hydrate cave completion There are very few studies on production stimulation mechanism and sand control effect

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