if this is timber land, they should pay you what should be the expected annual return on investment for land taken out of production. By that, i mean annual rent- say $250/acre/year for now. after a decade, the value will be more, so be careful about the length of time you give them at today's prices. make sure that the pipeline will be maintained by them. make sure that it is buried deep enough to allow you to build a road across it anywhere you want. i think you need a lawyer to help you fiddle with the language. this event could have long lasting consequences for you and your heirs.
charley