Device and method for simultaneous measurement of natural gas hydrate saturation and sediment permeability

Abstract

The invention discloses a natural gas hydrate saturation and sediment permeability synchronous measurement device. The device comprises an inverted reaction kettle, wherein a vacuum pumping system, a confining pressure control system and a prepared sample circulation system are connected to the bottom end of the reaction kettle, a permeability transient measurement system, a hydrate saturation measurement system and a data collection system are connected to the top end of the reaction kettle and connected with a computer, and the reaction kettle, the prepared sample circulation system and the permeability transient measurement system are all arranged in a temperature control system. The invention also discloses a natural gas hydrate saturation and sediment permeability synchronous measurement method. Through the device and method, synchronous transient measurement of the hydrate saturation and sediment permeability in the synthesis and decomposition process can be realized, and a reliable experimental platform is provided for research on the change law of reservoir permeability in the hydrate reservoir-forming and exploiting process.

Description

technical field [0001] The invention belongs to the technical field of basic physical property measurement of unconventional oil and gas reservoir engineering and geotechnical engineering, and specifically relates to a simultaneous measurement device for natural gas hydrate saturation and sediment permeability, and the invention also relates to a natural gas hydrate saturation and sediment Simultaneous measurement method of permeability. Background technique [0002] The exploration and development of natural gas hydrate has been highly valued by governments, universities and research institutions of various countries, and has become a research hotspot in unconventional oil and gas reservoir engineering. The engineering application of relevant theories puts forward higher requirements. my country's South China Sea and the Qinghai-Tibet Plateau contain abundant hydrate resources, and the implementation of trial mining of hydrates in sea areas is imminent. However, there are ...

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Problems solved by technology

However, the existing hydrate-containing sediment permeability measurement devices cannot perform real-time dynamic measurement of hydrate saturation, and it is difficult to form an ideal steady-state seepage state during measurement, especially for fine particles such as clayey silt in the South my country Sea. For hydrate-containing sediments, the measurement accuracy is low, the consumption time is long, the hydrate saturation is easy to change, and the simultaneous transient measurement of hydrate saturation and sediment permeability cannot be realized, which restricts the formation of hydrate. Research work on the change law of sediment permeability with hydrate saturation in the process of hydrolysis and decomposition and the theoretical model

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