A Gas Hydrate Cave Completion Evaluation and Testing Method

Abstract

The invention discloses a natural gas hydrate cave completion evaluation and testing device, comprising a reactor system, a cave completion system, a confining pressure control system, an inlet pressure control system, an outlet pressure control system, a gas-liquid-solid separation system, and a temperature control system and data acquisition and processing system; the reactor system is used to simulate the in-situ generation of natural gas hydrate, cave completion and exploitation; the temperature control system provides a constant temperature environment for the device; cave completion system, confining pressure control system, and inlet pressure control system , the outlet pressure control system and the gas-liquid-solid separation system are used to control the pressure and flow state of the experimental process; the data acquisition and processing system is used to collect and process the parameters of the experimental process. The invention also relates to a natural gas hydrate cave completion evaluation and testing method. The invention can carry out cave completion test on artificially synthesized hydrate-containing cores to evaluate the completion conditions of hydrate caves.

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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