Gas flow in nanoporous rocks is closely relevant to several globally important energy and environmental issues, such as shale-gas production CO2 subsurface sequestration. The Klinkenberg effect critical an understanding of gas flow, yet many specifics are unclear for rocks. Here we investigated the on basis a systematic study permeability diffusivity under range pore pressures varying water sat...

Borehole pre-drainage is an important technical means to control a coal mine gas disaster. In order determine the optimal parameters of Dashucun mine, damage permeability evolution model was established based on deformation, considering adsorption and desorption Klinkenberg effect, fluid-structure coupling seam containing by combining deformation equation mass conservation equation. COMSOL soft...

The mechanic and permeability behavior in sandy mudstone is crucial to hazard prevention safety mining. In this study, investigate the evolution characteristic of mechanical properties subjected loading in-site stress, a series triaxial compression–seepage experiments are performed. increase decrease strength gradually transformed responding confining stress from 5 15 MPa, which corresponds tra...

Unconventional gas resources from tight sand and shale gas reservoirs have received great attention in the past decade around the world, because of their large reserves as well as technical advances in developing these resources. As a result of improved horizontal drilling and hydraulic fracturing technologies, the progresses are being made towards commercial gas production from such reservoirs...

The effect of gas compressibility during flow through a porous medium modifies the governing equation for pressure, and low pressures, this leads to so-called Klinkenberg effect. Darcy’s law remains unchanged, accounting state parabolic pressure. increased rate at pressure nonlinearity equation. We present two broad approaches constructing exact solutions steady problem. First, geometric reduct...

Deep coal seams are characterized by large stress, high gas pressure, and low permeability. The disaster threatens the safe production of mine seriously. Gas extraction crossing-seam boreholes from floor roadway (GECMBFR) can reduce pressure content seam gas, which is main measure to prevent disaster. Considering Klinkenberg effect, governing equations adsorption/desorption-diffusion, seepage, ...

The permeability characteristics of natural fracture systems are crucial to the production potential shale gas wells. To investigate behavior a regional fault that is located within Wufeng Formation, China, samples with micro-fractures was measured at different confining pressures and complemented helium pycnometry for porosity, computed micro-tomographic (µCT) imaging, comparison well testing ...

The pre-drainage of coalbed methane through boreholes in the bottom drainage roadway (BDR) is key measure to prevent and control coal gas outburst. Different arrangement layers BDR will make a difference range drilling angle affect extraction effect. In this paper, mathematical model rock loose circle area around elliptical was constructed. Meanwhile, fluid–solid coupling constructed by using C...