The adsorption-swelling and permeability characteristics of natural and reconstituted anthracite coals

A review on pore-fractures in tectonically deformed coals

In subterranean coal seam gas (CSG) reservoirs, massive amounts of small-sized coal fines are released during the production and development stages, especially during hydraulic fracturing stimulati...

https://pubs.acs.org/doi/pdf/10.1021/acs.energyfuels.0c00045

Stable Dispersion of Coal Fines during Hydraulic Fracturing Flowback in Coal Seam Gas Reservoirs—An Experimental Study

Influence of coal moisture on initial gas desorption and gas-release energy characteristics

Experimental analysis on the effect of tectonically deformed coal types on fines generation characteristics

The effects of particle size and inorganic mineral content on fines migration in fracturing proppant during coalbed methane production

Pulverized coal is one of the main controlling factors constraining the capacity of coal-bed methane wells during CBM drainage. The characteristics of pulverized coal can be used to identify the sources of the pulverized coal particles and to develop reasonable means of controlling pulverized coal output. Using light transmission microscopy, laser particle size testing, X-ray diffraction, reflection polarized optical microscopy, and scanning electron microscopy with energy dispersive X, the characteristics of pulverized coal collected during CBM drainage in the Hancheng block were analyzed for concentration, particle size, composition, and morphology. These traits were used to identify the sources of pulverized coal. The results showed that coal body structure (structural damage) was a primary control factor of pulverized coal output. The sizes of the pulverized coal particles tended to be around 100 μm. The main components of pulverized coal were vitrinite and clay minerals. The pulverized coals were div...

https://journals.sagepub.com/doi/pdf/10.1260/0144-5987.31.5.745

Characteristics of Pulverized Coal during Coalbed Methane Drainage in Hancheng Block, Shaanxi Province, China:

The invention relates to an experimental method for simulating the generation and the migration of coal powder during coal-bed methane exploitation. The experimental method comprises the following steps of selecting experimental apparatuses; collecting coal rock samples to prepare artificial coal briquettes used in a simulation experiment; preparing a displacement solution for simulating fluid migrating in a coal-bed methane reservoir; preparing a propping agent filling layer for simulating a crack passage of a coal reservoir and a fracturing effect; designing an experimental scheme for simulating the generation and the migration of the coal powder during the coal-bed methane exploitation; collecting the coal powder in discharge liquid in the simulation experiment, and performing analysis on coal powder producing characteristics; and performing quantitative analysis on changes of the permeability of the coal briquettes under different experimental conditions. According to the experimental method disclosed by the invention, based on geological factors of the coal reservoir and engineering factors of coal-bed methane, horizon source, influence factors, producing characteristics and the like of the generation of the coal powder are analyzed, the physical stimulation of the geological characteristics of the coal reservoir and the physical stimulation of the draining and exploiting process of the coal-bed methane are realized, the law of the generation and the migration of the coal powder is obtained, and experimental data support is provided for the effective prevention and treatment of the production of the coal powder during the coal-bed methane exploitation.

Zheng Yao

Papers

Experimental analysis on the effect of tectonically deformed coal types on fines generation characteristics

The effects of particle size and inorganic mineral content on fines migration in fracturing proppant during coalbed methane production

Characteristics of Pulverized Coal during Coalbed Methane Drainage in Hancheng Block, Shaanxi Province, China:

Experimental method for simulating generation and migration of coal powder during coal-bed methane exploitation

Influence of coal mechanical properties and water content on generation characteristics of coal particles