What is shale gas adsorption?
Shale gas refers to self-generated and self-stored natural gas that accumulates within organic-rich shales or mudstones as a free gas phase or adsorbed gas. The adsorbed gas accounts for about 20–80% of total natural gas reserves. (2,4,5) The shale matrix contains a large number of nanoscale micropores.
What is the role of adsorption in industry?
Adsorption is very important operation in petroleum sector. It can be used for recovery or removal of sulphur from oil. Also, in catalytic reactions, adsorption is involved. Removal of many pollutants from wastewater can be carried out by adsorption.
What is adsorption in thermodynamics?
The most important appli- cation of thermodynamics to adsorption is the calculation of phase equilibrium between a gaseous mixture and a solid adsorbent. The basis for thermodynamic calculations is the adsorption isotherm, which gives the amount of gas adsorbed in the nanopores as a function of the external pressure.
How do you extract gas from shale?
Hydraulic fracturing – commonly known as fracking – is the process used to extract shale gas. Deep holes are drilled down into the shale rock, followed by horizontal drilling to access more of the gas, as shale reserves are typically distributed horizontally rather than vertically.
How do you extract oil from shale?
Ex SituDuring the ex situ process, oil shale is first extracted from the earth by surface or underground mining. The rock is crushed, and then retorted (heated) to release the shale oil. The shale oil is then refined of impurities, such as sulfur. In Situ In situ is a new, experimental method of extracting shale oil.
What is adsorption process?
Adsorption can be defined as a process in which material (adsorbate) travels from a gas or liquid phase and forms a superficial monomolecular layer on a solid or liquid condensed phase (substrate).
What are the advantages of adsorption?
Adsorption has certain advantages in comparison with other methods, because the removal of contaminants is easy to design and operate (technologically simple and adaptable to many treatment formats, it works at mild operation conditions and at a wide pH range), the process does not produce any toxic by-product.
How do you extract shale?
How is shale turned into oil?
Oil shale is a mixture of sand, silt, salt, and an insoluble organic substance called kerogen. Rock-like at room temperature, oil shale produces vapors and gases when heated, which in turn are condensed and turned into oil.
How is shale extracted from natural gas?
Shale gas or unconventional gas is extracted from the impermeable shale through a process called hydraulic fracturing (also known as hydrofracking or fracking). A crude form of this technique, involving nitroglycerine, was used for the first time around the 1860s to explore for oil and gas.
How is shale oil transported?
Shale oil. Shale oil is primarily transported via pipeline, utilizing existing and new pipeline infrastructure.
How adsorption is performed?
Adsorption is the adhesion of atoms, ions or molecules from a gas, liquid or dissolved solid to a surface. This process creates a film of the adsorbate on the surface of the adsorbent. This process differs from absorption, in which a fluid (the absorbate) is dissolved by or permeates a liquid or solid (the absorbent).
What are the disadvantages of adsorption?
As mentioned in Table 1, adsorption (physical) has several disadvantages, including the high cost of adsorbent, hard separation of the adsorbent from dye, and low surface area.
How do you extract shale gas?
What is the adsorption mechanism of shale gas?
Mechanisms of shale gas adsorption are investigated from the perspective of thermodynamics and kinetics. The dominant adsorption process of methane on shale may be physical adsorption.
Do clay minerals affect the gas adsorption capacity of shale?
Many researchers have found that the mineral composition also has an effect on gas adsorption capacity of shale [50], [58], [59], [60]. However, different researchers have different views on the influence of clay minerals on gas adsorption capacity of shale.
Does humidity affect gas adsorption capacity of shale?
In general, the gas adsorption capacity of the shale sample does decrease with increasing humidity because some adsorption sites are occupied by water molecules [53]. Many researchers have found that the mineral composition also has an effect on gas adsorption capacity of shale [50], [58], [59], [60].
What is adsorption?
Adsorption is one of the important mechanisms for shale gas storage [33], [34], [35], [36], [42], [49].