Directive 065: Resources Applications for Oil and Gas Reservoirs ...

Figure 7.3. Example of producing horizontal/multilateral legs from a single DSU
If a horizontal well is drilled from target area to target area between DSUs of identical size,
target area configuration, and mineral rights ownership, the corridor between target areas is
deemed “on target.” However, if any productive portion of the horizontal wellbore falls
outside this corridor, the entire horizontal wellbore is considered off target and a penalty may
be applied to the well’s total production. Assuming that the horizontal well in this example is
producing from the same pool in each quarter-section DSU, the well count would be one well
per DSU. Although the example illustrates only oil DSUs with central target areas, the rule
also applies to the gas DSUs for both central target and corner target areas.
Corridor between target areas
Figure 7.4. Example of a horizontal oil well drilled across adjacent quarter-section DSUs of common
mineral rights ownership
7-6 • ERCB Directive 065: Resources Applications / Application for Special Well Spacing (October 2011)