success rate in drilling31 Oct 2021 15:29
Thought this was useful with regards to success rate for drilling, provided by a chap from Royal Holloway
Conventional oil&gas:
It will depend on how well known (in geological terms) is the area where you are drilling. A well known area is where you know what is the source rock that originated hydrocarbons, how it got mature (cooked) and generated those hydrocarbons, how those hydrocarbons migrated up to a reservoir, how this reservoir is distributed across the area and how it gets trapped in order to form an hydrocarbon accumulation. All this knowledge is collectively called “Petroleum System”.
An unknown area (“frontier” in the jargon), where you are missing some of the “Petroleum System” components, is considered risky, so a 10–20% rate of success in exploration wells (wildcats) is reasonable.
As you move to better known areas, where you know most of the Petroleum System, then you move up to 30–50% rate of success for exploration wells.
If you are dealing with a pretty well known area, where there are many producing oilfields, then you can get up to 80–90% chance of success for exploration and development wells.
As exploration technology, like 3D seismic, has improved, exploration has become more successsful. For example Exxon’s rate of success offshore Guyana is pretty high for a formerly “frontier” basin, with only a few dry holes out of more than 16 oil discovery wells. Pretty good track record.