Coal bed methane reservoir pulverized coal generation, migration, sedimentation, blocking dynamic evaluation instrument

Abstract

The invention discloses a coal bed methane reservoir pulverized coal generation, migration, sedimentation, blocking dynamic evaluation instrument which comprises a core displacement module, a vacuumizing module, a visualized core clamping module, a bottom water simulating module, a confining pressure module, a return pressure module, a measuring module, a microscope digital image submodule and temperature control and data acquisition module. The dynamic evaluation instrument is used for observing and evaluating coal bed methane reservoir pulverized coal generation, migration, sedimentation, blocking and the like, and capable of analyzing and observing coal bed methane reservoir pulverized coal sources and pulverized coal migration passages, quantitatively evaluating influence of pulverized coal sedimentation and blocking on reservoir permeability and reservoir production, and determining relations between draining gas recovery parameters and produced pulverized coal, and a experimental foundation is provided for pulverized coal production reduction, equipment wear rate lowering and discharging recovery optimizing. In addition, by the dynamic evaluation instrument, motion laws of pulverized coal in cores can be observed, the optimal discharging recovery under pulverized coal migration can be explored, and maximal resource utilization rate can be obtained.

Description

technical field [0001] The invention belongs to the industry of coalbed methane exploration and exploitation, and in particular relates to a dynamic evaluation instrument for the generation, migration, settlement and blockage of pulverized coal in coalbed methane reservoirs. Background technique [0002] At present, most coalbed methane wells use horizontal technology, hydraulic fracturing technology and multi-component gas displacement technology to improve the single well production of gas wells. However, the geological structure of most coal seams in my country is complex, structural coal is developed, and the coal quality is brittle, poor in cementation, fragile and easy to collapse, and there is a serious phenomenon of coal powder output in the mining process. The migration of pulverized coal in the coal seam can settle and block the seepage channel, which will accelerate the decline rate of the coalbed methane well and even stop production; The occurrence of pumps and...

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Problems solved by technology

[0006] The purpose of the present invention is to use a dynamic evaluation instrument for the generation, migration, settlement and blockage of pulverized coal in coalbed methane reservoirs, aiming at solving the lack of a set of special simulated mine near-well conditions at home and abroad to observe and evaluate coalbed methane reservoirs Problems with the experimental equipment for the movement laws of pulverized coal production, migration, settlement, and clogging

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