If you own minerals under the Bell Creek oil field you have received offers to purchase your minerals. Typically these offers amount to 50 or 60 times your current monthly royalty payment. I'd discourage anyone from selling at those rates. The field operator Denbury Resources is about to start an enhanced recovery program with CO2 injection. It is expected to begin within the next few months.
Estimate vary as to how much this might increase production. Some show it will increase current production between two and three times (for the next few years). However, these are only estimates. It is uncertain how much production can actually be increased. None the less, accepting an offer today based on 60 times last month's production is the likely equivalent of selling for only 30 times what it may be producing a year from now.
On the other hand, Bell Creek is a very old oil field. It went into production nearly fifty years ago (1967). The past couple decades it has been water flooded for secondary recovery. That is they injected water to try to force out additional oil. This new enhanced recovery will use CO2 gas (in lieu of water) for essentially the same purpose. Although the amount is unknown, this will increase the field's production for the next few years and likely extend the field's life.
Though existing mineral owners need to also be aware Denbury (the field operator) intends to reduce your "participation factor". That is, they will be reducing the percentage of the oil you're entitled to. The amount of the reduction depends upon which "Tract" your minerals are under. So while production will increase, your share of that will be decreased. Though the net result is the amount of royalty you should receive in the future is more than you're being paid today.
Bottom line, a good rule of thumb is never sell minerals. However, if selling is attractive to you (for whatever reason) don't sell your Bell Creek minerals too cheap. In my opinion selling for 60 or 70 times current production is just too low. If you wish to sell, before accepting a low offer contact me, I may offer you better terms and add to my position there.