Journal of Petroleum & Environmental Biotechnology

The application of tube-shaped model to evaluate adsorption in shale pore structure

2^nd World Congress on Petrochemistry and Chemical Engineering

October 27-29, 2014 Embassy Suites Las Vegas, USA

Yanzun Li, Xiangfang Li and Juntai Shi

Accepted Abstracts: J Pet Environ Biotechnol

Abstract:

For the shale pore structure is different from the slit of coal, the model based on slit-shaped pore to describe theadsorption behavior of gases will leads the error of calculation. It is important to develop the model suit for tube-shaped pore as in shale. With the new model, the gas adsorption effect can be re-evaluated. In this paper, the potential of gas, which expressedas the sum of the gas?fluid and gas?solid potentials at a position, has been calculate by the effect of tube pore wall. Based on the potential function, the new adsorption model is established. Then the ratio of adsorbed gas is calculated in different pore size. The result of the new model shown that the potential of gas, is 3~5 times more than slit model. Considering the density of the adsorption gas is higher than liquid phase, the adsorbed gas will take around two thirds of the bulk gas, which increase 10%~15% than slit model. In additional, the critical pore size has been calculated. The minimum value of critical pore size is increase, which means the pore of shale have more storage ability. Most shale gas exists as adsorbing gas in the nano-pore of matrix or kerogen. With the new model, the adsorbed gas will be calculatedaccurately. It will significantlyinfluence the shale gas evaluation and production.