Gulf recently said that the maintenance PF reservoir pressure isn't coming from aquifer drive. And that a gas cap is expaning. Now they say there's virtually no pressure reduction despite removing c. 15 million barrels of oil from (so they previously said) the fracture system. What could explain this? I suggest: (a) a very large Transient Drainage Radius and Connected Volume (Stafford reportediy gave huge numbers for these parameters at the PESGB in July 2013, and (b) release of oil from the matrix. Transient pressure drops could allow some dissolved gas to come out of solution within the reservoir, expanding the gas cap.
As we are talking about new cpr data this of course make complete sense. As you take oil out you get a reduction in pressure that pressure will change depending on size quantity and connectivity.
You can do all the 2d and 3d scans you like but this information is without question. If the change is very low in comparison of what you removed then you have something spectacular .
With the oil removed they will now have some very accurate info and this will likely show what parts are definitely connected or not. Still holding strong here with same expectations, realise its about payments but if we get thru the storm the view the other side could be amazing
There are a number of ways in which ERC Equipoise could upgrade the 12.3.2014 CPR numbers:
(a) shift from 3P to 2P, and 3C to 2C;
(b) increase the Oil In Place, by such things as (i) increasing the rock volume, (ii) increasing the matrix porosity, (iii) increasing the fracture porosity, (iv) increasing the fill factor, (v) lower the OWC level;
(c) increase the Recovery Factor, by such things as (i) higher fracture porosity (differential effect), (ii) larger fractures, (iii) lower oil viscosity, (iii) H2S reinjection effect.
So all sorts of tunes can be played on the numbers. IMO the absence of water in the produced oil is highly significant.
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