The Experimental Device of Ultrasonic Promoting Gas Percolation

Abstract

The invention discloses an experimental device for promoting gas seepage by ultrasonic waves, which comprises a core holder, a constant temperature control module, an axial pressure and a confining pressure module; the core in the core holder is connected with a gas collection and pressurization module and a vacuum module; An ultrasonic loading module is arranged around the core holder, and the core holder is connected with a vibration detection module; the experimental device also includes a measurement and data acquisition module for collecting core axial pressure, confining pressure, and gas inlet pressure and velocity. This device is an experimental device for simulating the seepage law of coalbed methane under ultrasonic loading in the near-wellbore zone. It can provide experimental conditions of different temperatures and triaxial stress states, and load different frequencies and different powers from the vertical seepage direction, along the seepage flow direction, and reverse seepage flow direction. The ultrasonic field can separate the influence of ultrasonic mechanical vibration and thermal effect on gas seepage through the water bath constant temperature module, and simulate the influence of a single factor of mechanical vibration or thermal effect on seepage.

Description

technical field [0001] The invention relates to the technical field of coalbed methane exploration and development, in particular to an experimental device for promoting gas percolation by ultrasonic waves. Background technique [0002] At present, the traditional coalbed methane development technology is mainly hydraulic fracturing technology, but due to the complex geological conditions in my country, the single well production of coalbed methane is not high, and the coalbed methane development technology is not suitable for the geological conditions of coal reservoirs. At the same time, the injection of fracturing fluid into the coal seam will cause permanent damage to the coal reservoir, which is also an important reason for the low production of CBM single wells. Therefore, the development of new development technology has become another development direction to break through the "bottleneck" of CBM development. The permeability of coal reservoirs in my country is low,...

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Problems solved by technology

However, there is currently no relatively complete experimental device that can deeply analyze the mechanism of ultrasonic technology improving coal reservoir conditions, which restricts the application of ultrasonic technology in coalbed methane wells

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