Metgasco are going to try and force their way into the
Northern Rivers despite overwhelming community
opposition. This is where Australians need to make a defining stand against the
CSG industry. Will you join them at Camp Liberty?
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:
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
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
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
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:
"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."