Jack Blake has same issue as you except Encana has been paying for six months and Shell still has not paid!
Well came on line in Oct. and Encana started paying in Dec or Jan. Jack has called the royalty owner hotline numerous times. The first time I called it they already had assigned me a royalty owner number. Them suckers just try to hold your money as long as they can.
Someone ought to file a class action lawsuit on their arse!!
Jacks well is Matthew Murray #21. What well is yours bshelby?
This seems common with the Shell/Encana deal. Sometimes when Shell is 50/50 with Encana but is not the actual operator they wait on Encana to send them the title on each tract or wait on Encana's que on putting a tract in pay. Encana may even begin paying prior to a final title opinion while Shell waits on the title opinion (or the landowner's demand letter...). These extra steps of passing info from the operator to non-operator can usually be the delay (as long as there are not any other suspense issues with the interest).
All that said, they still shouldn't fall behind the operator this many months. Before sending a demand letter you could call Shell's owners relation number and try to get connected with the specific Div. Order analyst for your well to explain the situation (I find this easier with Shell than some of the others). If this fails - send cert. return receipt letter outlining your info (well name, S-T-R, Parish, etc...) and the issue, also mention that Encana has paid multiple months so far on that specific interest. Usually they will get it in pay soon thereafter and make up for months back to date of first production.