I wish I could find a decent source for the DUCs. Hard to know if the production support while drilling was reduced was mostly due to working down the backlog of completing wells already drilled.
Hmm - I haven't seen anything comprehensive, just some articles from time to time. Like some of the for-profit companies like IHS have assimilated; otherwise, suspect a company like BJ keeps those things alert to them as that is their immediate future to stay in business. Only other way is peruse public databases in key states of ND, Texas and Colorado/Wyoming.
I did read recently the latest issue of the Journal of Petroleum Technology(which I cannot reproduce) and it was stated that the last land rig count on March 24, 2016 of 464 is the lowest rig count since Abraham Lincoln was President.
That is quite a feat there.