RE: An rns and cpr26 Feb 2020 09:35
"If we are shutting off the desperate pressure at the end of the horizontal why does it need to be rebuilt?"
A Reservoir Model doesn't just look at the oily bits - it looks at the area for a long distance around and also vertically . You have to be able to forecast the movement of oil, gas & water across the whole thing in time. The water drives the oil/gas towards the producing wells so the model has to be built to take that into account.
I understand they build (in a computer) a vast series of small blocks (think of Lego blocks here) each maybe a 10 -20 ft a side. This has maybe several million blocks covering an area of 10 sq kms and say 200 ft thick. Each block has to have a net sand, a porosity, a permeability, oil/water saturation, pressures etc etc as a minimum.
You then "fill" it with oil and water based on your results to date and your geological model. Then you start to pull oil out at HH1z........ the programme shows how the oil and water flow over time from cell to cell across the whole model over 20, 30 50 years..
Very powerful, almost always wrong in detail but its all you have
Problem is when you find something unexpected - such as a new pressure regime - you have to go back in with a new geological model and change all the parameters in the area affected. So some will become non -flowing barriers and others beyond that will be changed to an oil/water mix.
This is not a simple exercise. And The OGA will want to see all the results before granting an FDP
http://www.oil-gasportal.com/reservoir-management/integrated-reservoir-modeling/
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