Starting pressure gradient directly affects the recovery rate of low permeable oilfield and the prediction accuracy of reservoir pressure, it bears nonlinear relation to some factors like fluid viscosity, density, permeability and porosity .
We established the templates for the conversion calculation between micro-pore-throat's fractal dimension,porosity and permeability for conglomerate hyposmosis reservoirs in west China. By this method,we can calculate micro fractal dimensions using the porosity and the parameters obtained from common log files in reservoirs,in order to classify the flow units of the whole reservoir and to make an evaluation of the flow units.
However, a large volume and high energy consumption are needed in biotransformation, while the low permeability and stability must be solved in the membrane process.
For low permeability membranes, instability with respect to monotonic finite-wavelength perturbations is characteristic.
In this system a water layer overlies a superheated-steam layer in a reservoir with relatively low permeability located between two parallel high-permeability strata.
It is proposed that low permeability of plasma membranes to water in fraction-I seeds results from the predominantly closed aquaporin channels, whereas a higher permeability of weak seeds (fraction II) is due to open channels.
Increased magnesium concentration in the secondary cardioplegia did not provide additional benefit to the ischemic myocardium, possibly due to the low permeability of the sarcolemmal membrane to magnesium.
The focus in Ordos basin, however, should be put on the relatively high permeability sandstones in a generally low permeable sandstone background.
The simplified geological model is composed of 3 layers, sedimentary layer, high permeable basement layer and low permeable basement layer from top to bottom.
The permeability of low permeable wood deviates from Darcy's law with the length of the speciment used.
Different underground morphologies can derive from the presence of a water table related to an external stream or from the confined setting of the carbonate rocks, underlying low permeable sedimentary cover, where artesian conditions can occur.
Main characteristics of the rock mass are: (1) low permeable limestone of moderate to high strength, (2) high karstification generally localized around intersection of faults or discontinuities.
Hyposmosis also activated phosphatidylinositide 3-kinase (PI3K) and its prevention by wortmannin (100?nM) essentially abolished 3H-taurine efflux.
All agents decreased variably the hyposmosis-induced elevation in 86Rb efflux, whereas NPPB induced a complete block, suggesting a link between basolateral K+ and Cl-1 efflux.
L-canavanine in a concentration of 3 mM, increased the basal and hyposmosis-induced TRH secretion from the posterior pituitary and the paraventricular nucleus, and both basal and ethanol-induced TRH secretion from isolated pancreatic islets.