Mercury analysers improve oil rig safety
An
Able Instruments and Controls product story
Edited by the Engineeringtalk editorial team
Jun 8, 2007
Mercury will evaporate and produce harmful vapours at relatively low temperatures.
Able offers portable mercury analysers to determine the amount of mercury vapour at any given location.
Almost all oil and gas is found within the tiny spaces in sedimentary rocks, mainly sandstone and coarse-grained limestone.
Bedrock limestone and sandstone, even though hard, also contain lots of pores that can contain water or oil or gas and other elements.
Along with the gas and oil is a mixture of sand, silt and mud.
This sludgy silt mud is rich in heavier metal elements including uranium and mercury.
Even the heavy uranium can be suspended in the product as it is drawn from the well.
However because mercury exists naturally in vapour form it is readily drawn along with the gas product.
Where these contaminants end up in the plant depends on many factors.
Mercury as suspended vapour in the product will act in the same way as many other oil and gas products.
During fractional distillation temperature and pressure changes allow vapours to condense into selected by-products.
In the same way, certain vessels on the rig or in the refinery may lend the right conditions for vapourised mercury to condense back into liquid.
Here it will form as either small globules or in small puddles when collected in the base of pipes and vessels.
In the case of the heavier elements suspended in the product, over time these form scale that can be egg shell like or develop to much heavier deposits such as deep layers of tree-ring type deposits.
These deposits are formed of various elements that may contain heavy metals from uranium ores to mercury.
It is expected that the heavier elements from the sludge will be drawn up increasingly along with the product from older wells.
Recently on offshore installations when breaking containment in vessels, engineers have found deposits and small puddles of liquid mercury.
Mercury will evaporate and produce harmful vapours at relatively low temperatures.
When a pressurised vessel that contains mercury droplets is depressurised, these vapours will start to be released.
When breaking confinement, even though a thorough gas test has shown there is no flammable gas present the vessel could still present a hazardous health risk from invisible mercury vapours.
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