I know the 640 acres is the standard unit for the HS. At some point the shales thins and turns to sand "the fringe" and will not follow section lines. Will smaller units be allowed if only say half of a section would be productive?
Smaller 320 acre units are allowed if the operator can prove to the Office of Conservation that there is a valid geological reason for for the downspacing (however, keep in mind that the OOC are there to protect the mineral owners interest and LA's interest = how will the downspacing affect rolyalty revenue streams to all represented parties).
Eventually all of the HSVLS wells will be dowspaced to 320's, 160's, & eventually to 80's. Most operators are currently drilling verticals on 640's to hold acerage (rightfully so with economic conditions being what they are). Later when the market conditions are better the 640 acre units will be infilled with as much as 7 addtional increased density wells (8 wells per 640 = 80 acre units). This will not occur across the board, but it will be the norm in the future.
You are correct. I was refering to downspacing to indicate relative drainage radiuses and not unit size, sorry if I was misleading. However the orginal question was can a HSVLS well be drilled/produced on a unit smaller then a 640. and the ansewer is yes they can if the operator seeks it and it is approved by the state.