More "formal" offshore oil platforms, and a distinct offshore oil deposit type, are already provided by Cargo Ships (a recommended pairing to this mod). Regarding pipes, extraction of submerged uranium and thorium can be done with a support structure around the mining site (would typically be constructed using refined concrete); drills can pass fluid through each other, so it's possible to create a set of continuous lines of drills for extraction purposes with the extraction fluid being fed at one end.