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Index > Australia > NSW > Metgasco > Bentley > What is Tight Gas?

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What is Tight Gas?

Tight gas is natural gas produced from reservoir rocks with such low permeability that massive hydraulic fracturing is necessary to produce the well at economic rates.

Although shales have low permeability and low effective porosity, shale gas is usually considered separate from tight gas, which is contained most commonly in sandstone, but sometimes in limestone. Tight gas is considered an unconventional source of natural gas. (Source: Wikipedia)

How Is Tight Gas Produced?

While a conventional gas formation can be relatively easily drilled and extracted from the ground unassisted, tight gas requires more effort to pull it from the ground because of the extremely tight formation in which it is located.

In other words, the pores in the rock formation in which the gas is trapped are either irregularly distributed or badly connected with overly narrow capillaries, lessening permeability -- or the ability of the gas to travel through the rock.

Without secondary production methods, gas from a tight formation would flow at very slow rates, making production uneconomical.

Production stimulation can be achieved on tight gas reservoirs through both fracturing and acidizing the wells.

Fracturing, also known as "fracing," a well involves breaking the rocks in the formation apart.

Performed after the well has been drilled and completed, hydraulic fracturing is achieved by pumping the well full of frac fluids under high pressure to break the rocks in the reservoir apart and improve permeability, or the ability of the gas to flow through the formation.

Additionally, acidizing the well is employed to improve permeability and production rates of tight gas formations. Acidation involves pumping the well with acids that dissolve the limestone, dolomite and calcite cement between the sediment grains of the reservoir rocks.

This form of production stimulation helps to reinvigorate permeability by reestablishing the natural fissures that were present in the formation before compaction and cementation.

Furthermore, deliquification of the tight gas wells can help to overcome some production challenges. In many tight gas formations, the reservoirs also contain small amounts of water. This water can collect and undermine production processes.

Deliquification is achieved in this instance through artificial lift techniques, such as using a beam pumping system to remove the water from the reservoir, although this has not proven the most effective way to overcome this challenge. (Source: Rigzone)
 

"The farmer who has allowed the Access Agreement doesn't even live there"
Locals say "His property is in terrible repair with old machinery and barbed wire on the ground. I fear for the well being of grazing herd."

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