Gas disaster prevention and control is essential to coal mine safety production, with accurate measurement of gas pressure content being the challenging key aspect. Pressure- gas-maintaining coring devices can characterize cores in situ achieve this measurement. As an important part these devices, hydraulic structure bit plays a decisive role migration, rate, core disturbance bottom-hole cuttin...

The structure of caprocks is often greatly altered by different scales faults or fissures in long-term geological tectonic evolution, and the sealing performance may be deteriorated. In this paper, a simplified model characterized as multilayered sandstone fault-bearing extracted from Shuang 6 underground gas storage located Liaohe oilfield was established. Different fault geometry (e.g., lengt...

In the current paper, we further improved the model for the migration of planets introduced in Del Popolo et al. (2001) and extended to time-dependent planetesimal accretion disks in Del Popolo and Ekşi (2002). In the current study, the assumption of Del Popolo and Ekşi (2002), that the surface density in planetesimals is proportional to that of gas, is released. In order to obtain the evolutio...

In the core accretion model, gas giant formation is a race between growth and migration; for a core to become a jovian planet, it must accrete its envelope before it spirals into the host star. We use a multizone numerical model to extend our previous investigation of the “window of opportunity” for gas giant formation within a disk. When the collision cross-section enhancement due to core atmo...