RE: Nigoil22 Mar 2019 09:56
Hmmmm.... need to revise down the Sak and Ugnu numbers I think.
http://www.petroleumnews.com/pntruncate/135537818.shtml
"Cold, heavy oil
West Sak oil isn’t just heavy oil, it is “cold, heavy oil, and that means it’s extremely viscous,” he said.
The reservoirs are shallow, from roughly 3,000 feet below the surface to some 4,500 feet and they lie under some 1,800 feet of permafrost, so the reservoir temperatures vary from about 40 degrees Fahrenheit to about 90 degrees F, “and that combination of these cold temperatures and the relatively low API means that we have extremely high viscosities,” Fox said.
Prudhoe Bay and Kuparuk oil have about the same viscosity — ability to flow — as water, he said. West Sak has about the same viscosity as olive oil and the shallower Ugnu has viscosity similar to maple syrup.
In terms of production this is a big whammy, Fox said: West Sak is about 100 times as viscous as water. The flow rate of oil is “indirectly proportional to viscosity, so if viscosity increases by a factor of 100, which is what we have here going from the Kuparuk to the West Sak, rates will decrease by a factor of 100.”
In addition, recovery rates are lower because West Sak oil is very difficult to move out of the pore spaces in the formation, “it’s very difficult to displace because of its viscosity,” he said.
And refineries pay less for lower API oil than for Prudhoe or Kuparuk oil."