It is not uncommon to encounter a situation where a mineral owner owns all the mineral estate in a tract of land, but the royalty interest in that tract has been divided and conveyed to a number of parties; i.e., the royalty ownership is not common in the entire tract. If a lease is granted by the mineral owner on the entire tract, and the lessee intends to develop the entire tract as a producing unit, the royalty owners may desire to enter into an agreement providing for all royalty owners in the tract to participate in production royalty, regardless of where the well is actually located on the tract. This form of agreement accomplishes this objective.