RE: RE: Someone mentions balcombe to co24 Mar 2019 00:27
Mirasol - some folk use that rule of thumb, but there are several factors that affect this making it either higher or lower.
If you drill a vertical well through a 9ft thick oil bearing rock (payzone) and the oil bearing rock is horizontal (aka 90 degrees) then you have physical contact with 9ft of rock. Then you are relying on the permeability of the rock for you to produce from the oil bearing rock in a 360degree direction. So its rather like the garden hose effect where the further you walk away from the tap the lower the water pressure, but in reverse. If permeability is high (imagine each pocket of oil is connected by straws to create a super highway) then you can produce from a deeper zone radially, but if your permeability is low, then you won't produce as much.
Where as you drill a horizontal well, in the case of Balcombe the well was drilled in the Upper Limestone (KL4) staying within the payzone. The slotted linear (pre drilled holes) is 1,600ft, which means there is 1,600ft exposure to the payzone. All that needs to be done is for the EWT paperwork to be approved and then Angus can do exactly the same thing that they are going to do at Brockham.
Having 2 EWT (Brockham and Balcombe) being simultaneously carried out by the end of 2019 is feasible depending on Angus urgency in getting the programme submitted and approved by all authorities. A lot of the information will just be a cut and paste from the Brockham test regarding equipment specifications, rig ups, monitoring, in the event of procedures.
That is why I said before that Balcombe is the jewel in the Angus portfolio and then Brockham.