Don't take a 1 time payment, it should be a annual (5 or 10 year) lease, with payments to renew each term, including increases tied to inflation, tax increases or other economic indicators. Look at it almost like you are renting them a house or cropland - you would not accept a single one time payment from your renter so they could use the house/land forever and the rent would not stay the same for 50 or 100+ years.
i'll say it again folks. royalty increase. do the math.
You also have to consider if they put it near your house, what could it diminish your home value. Noise and light.
some here under non-disclosure agreements recieved significant royalty increases. it helps to know the language of nose-picks and foot shuffles.
ask for footprint restrictions
As with anything real-estate related - location, location, location is what must be considered. You have to consider the location of the land with respect to the base land value (what is land worth in that area), the location of the land with respect to the oil and gas play (how good are the wells in that area), the location of the well site in relation to other features on that parcel (is it near anything that might be devalued such as a home site, is it going to occupy crop land or forest land and eliminate or affect some other current and future income production on the parcel).