Production practice has shown that not all low-production coalbed methane (CBM) wells can be reconstructed into high-production through secondary stimulation, so it is necessary and timely to establish an evaluation index system, form method, evaluate the reconstruction potential of wells. Based on development CBM in southern Qinshui Basin, this paper analyzes influencing factors low production...

The Baiyanghe block in Fukang, Xinjiang, China, is rich coalbed methane (CBM) resources, and several pilot experimental wells have yielded high production. Due to the dip angle (35–55°) of coal seam this area, lack understanding geological characteristics, physical properties coal, gas–water migration law lead immature development techniques poor overall benefits. We first conducted desorption ...

The concentration of low-concentration coalbed methane extracted from underground coal mine fluctuates greatly, which does not meet the requirements intake coalbed-methane utilization devices. Due to this fluctuation, coalbed-methane-utilization device cannot maintain stable and safe operation. gas-mixing is mainly used in systems, providing each with a feed gas source qualified concentration. ...

Numerical simulation is an efficient method to quantitatively describe the reservoir dynamics of coalbed methane (CBM) reservoirs. The ideal steeply inclined model (ISIM), assumed be a plate, has been widely applied in steep modeling, although ISIM cannot accurately reflect actual geological conditions. In this paper, CBM production and reservoirs using (ASIM) were compared, taking coal Fukang ...

The fluid flow behaviors during the production of coalbed methane (CBM) are generally restricted by pre-existing natural fractures in coal seams. To better understand effect micro-fracture morphology on capability, nine coals collected from Ordos Basin were subjected to optical microscope observations obtain micro-fractures morphology. And then, box-counting method (BCM) was used quantify compl...

Bystudying the source reservoir geochemical characteristics, cap physical properties, gas-bearing characteristics and reservoir-forming types of coal-measure gas (CMG) accumulation system, potential CMG resources in Huanghebei Coalfield was determined, sedimentary control mechanism analyzed, which is great significance for orderly development reservoirs. mainly includes abundant shale (SG; 2100...

Hydraulic fracturing is the main technical means for reservoir stimulation of coalbed methane (CBM) vertical wells. The design fluid volume (FFV) mainly through numerical simulation, and simulation method does not fully consider water block damage caused by leakage into reservoir. In this work, variance analysis was used to analyze production data 1238 CBM wells in Fanzhuang Zhengzhuang Qinshui...

Adsorption and diffusion are the key factors affecting coalbed methane (CBM) accumulation, resource assessment production prediction. To study adsorption mechanism of Fukang low-rank coal at microscopic level, samples were collected, elemental composition, carbon type distribution functional group structure determined by analysis (Ea), Fourier-transform interferometric radiometer (FTIR), X-ray ...

We discuss mathematical and computational models of two applications important for global climate and energy recovery involving the evolution of methane gas in the subsurface. In particular, we develop advanced models of adsorption occuring in coalbed methane recovery processes, and discuss the underlying conservation laws with non-standard terms. Next we describe the phase transitions relevant...