RE:RE:RE:RE: "300m thick cement plug"That's a great question (not sarcastic), and I had the same question before becoming a drilling engineer. Exploration wells are generally designed differently than production wells - whether that be hole size, casing size, casing grade, and drilling fluid to name a few. Also, drilling a production well needs to take completion design into account. Exploration well priority is to gain information so likely not a great well designed for production. Better off just drilling a new well designed for production.