In enhanced geothermal systems (EGS), the natural permeability of deep rocks is normally
not high enough and needs to be increased. Permeability increase can be achieved through …

The technique of thermal stimulation for coalbed methane extraction is considered an
important approach for increasing coalbed methane production capacity in the future. This …

Liquid nitrogen (LN2) is an important means to improve the permeability of coal reservoirs.
The LN2 soaking method has a wide range of application prospects. However, not enough …

The recent growth in energy technologies and the management of subsurface reservoirs has
led to increased human interaction with the Earth's crust. One consequence of this is the …

Liquid nitrogen freeze–thaw has been used in oil, shale gas and coalbed methane
exploitation as an efficient fracturing technology. This paper aimed to study the effect of …

Chinese coal seams are characterized by high gas content and low permeability. The
permeability of coal seams should be improved to achieve maximum extraction of coalbed …

It is well known that the deformation of coal will implicitly influence the fluid flow transport
properties due to the coupled stress-permeability evolution. The stress-induced structural …

Studies of the microstructure and permeability evolution behavior of coal under conditions of
liquid nitrogen (LN 2) fracturing are helpful to clarify the mechanism of fracturing. The …

Hydraulic fracturing and permeability enhancement are effective methods to improve low-
permeability coal seams. However, few studies focused on methods to increase …

Laboratory hydraulic fracturing tests on cubic granite specimens with a side length of 100
mm were performed under true triaxial stress conditions combined with acoustic emission …