A predictive model of gas content in coal reservoirs based on multiple stepwise regression analysis: a case study from Qinshui Basin;

Quantitative analysis of geological factors affecting coal-seam gas content;

Coalbed gas content is an important information which is essential for exploration and development,selected area evaluation and reservoir study of coalbed methane,and to obtain the accurate lost gas is the key to determine the reliability of coalbed gas content.

Comprehensive evaluation of gas-bearing traps in volcanic rocks of Xujiaweizi depression;

It is difficult to evaluate its gas-bearing correctly with conventional logging methods.

Analyses data as average methane content, saturation, critical desorption pressure and theoretical recovery in the main coal reservoirs as well as desorption rate and desorptionable volume of coal bed methane(CBM).

The void fraction increases with prolonging of agitation time.

In this paper,the prediction of void fraction and pressure drop for upward gas-liquid annular flow in a vertical annulus is studied.

A sensor with semi-circle capacitor is adopted to on-line automatically and averagely measure the void fraction of crude oil.

Discussion on air content in production of anti-freeze concrete;

Influence of mixing speed on fresh concrete air content;

Control measures for railroad concrete air content in upland seasonal frosty area;