by rockdoc123 » Thu 09 Jun 2016, 14:04:30
$this->bbcode_second_pass_quote('', 'O')ther folks here (such as RM or rockdoc) do have the experience and perhaps math/physics knowledge to enter into a real discussion. Where are they?
I suspect Rockman, like me can’t be bothered to waste his time in an esoteric discussion. Indeed that is all it is simply because what has governed oil and gas production from it’s inception is the value prospect of commodities, not the energy returned.
To put it in terms similar to the academic EROEI the industry looks at MROMI or money returned on money invested and virtually nothing else. Our measurements for that are several they can be discounted profit to investment ration (DPRI), Net Present Value (NPV), Return on Capital Invested (RCI), Internal Rate of Return (IRR) etc. The underlying reason for using money as the measure is that oil and gas companies are in business to make profit, not to produce energy but the details of that are a bit more diverse. I think it best to use an analogy.
Lets look at two oil projects, one in country A another in Country B. Both projects entail drilling to 14,000 MD (measured depth), both use a similar size rig (a triple) with the same kit (top drive, mechanical push etc). Both projects are drilled with the same mud system (lets say KCL polymer for arguments sake) and both assume that all electric logging will be conducted after TD (total depth) is reached. By luck the stratigraphic succession penetrated by the two wells are very similar and drilling times are identical. Both wells are successful and serendipity determines they produce at the exact same rate (4000 bopd for arguments sake) and have the exact same oil characteristics (35 API, 60 cp, 0.5% sulphur, 1% BSW (basic sediment & water), minimal other impurities and a PVT analysis indicates identical behavior of the hydrocarbons). A third party audit determines that the total reserves recoverable from both wells are identical (100 MMBbls for arguments sake). Transportation distance and methodology is the same, pipeline to a terminal.
In terms of energy analysis, the energy input to each well would have to include the energy required to create all of the equipment used in the operation (drilling rig, tubulars, consumables, site construction, construction equipment, pipeline materials and construction etc) and the energy consumed in the drilling of the well. Both projects in country A and country B would have the same energy input given the wells are identical. Because the hydrocarbons encountered are the same, the energy output is also the same. Hence if you wanted to be an academic you could say the EROEI of both projects are the same. But this is meaningless to the oil and gas industry and here is why.
Let’s say the cost of labor in country A is $4/bbl, capital equipment is $1 MM, rig cost is $7 MM, completion cost is $1.5 MM, transportation cost is $10/bbl, opex is $10/bbl, oil price is $40/bbl and government take is 80%. This situation would not be unusual where you are in a relatively remote area of SE Asia where labor is cheap but everything is more expensive due to scarcity of supply and the government has fairly harsh production sharing or royalty tax terms. In country B the cost of labor is $6/bb, capital equipment is $500K, rig cost is $2 MM, completion cost is $500K transportation cost is $3/bbl, Opex is $4/bbl, oil price is $42.50 a barrel and government take is 50%. This situation would not be unusual in a western country where labor is more expensive but everything else is cheaper due to lots of competition and availability and the government has relatively generous terms in order to attract investment.
When you run the numbers the project in country A would lose you about $1.4 billion whereas the project in country B would make a profit of $1.2 billion (undiscounted for simplicity). Both projects have the same EROEI but one is profitable and the other is not, hence one will likely get drilled and the other will not. That is what drives oil and gas E&P. Peak Oil which is the point of maximum production is a product of what gets drilled and produced, not what is theoretically there. Academics in their ivory towers busily calculating energy balances do not determine what is produced, it is oil companies who make those decisions solely on potential profitability.
And of course the calculation of profitability is always changing at different rates around the world. Taxes might increase one place and decrease another, unions may determine labor is costlier in the future in one place whereas abundant unemployed skilled workers in another area may make labor cheaper. If price goes too high less projects are done so competitive service companies drop prices in places where they think they can get work or they have the majority of their equipment. That does not mean that service costs will drop at the same rate everywhere though. Trying to simply the understanding of how this all works into a simple equation that involves entropy is naive at best.