The typical royalty provision for gas begins: "On gas produced and sold, the equal ... What about the other gas that they do not tell you about?
The Operator will use the gas to run equipment - separators, compressors, etc. This natural gas is not SOLD, it is USED on the lease. On pooled land, it is used off the lease. To us, it makes no difference. Once the asset (natural gas) is captured, it becomes personal property and as such the royalty owner should be due his fair share of his asset. How much does this cost you? Depends. In my experience in se Texas, it takes about 1500 mcf per month to run the equipment PER WELL. Take 1500 mcf at $4.00 per mcf and 1/4 royalty and you only give up $1500 per month, PER WELL.
Even if you have a "Typical" no-deductions clause, it will not protect you, since it all goes back to the royalty on gas produced and sold language. My form for royalty goes into explicit detail, but it all starts out, "On gas produced and saved, the royalty shall be...."
This is not legal advice, but sound business advice.
If you are 100% confident in your ability to construct a very good royalty provision by all means do so. Otherwise contact a qualified professional experienced in this type of provision.