Charlatan--probably $3000 would be a good average price for a rework.
To address the flow question...remember that some of these wells were simply shut down because the 1980s prices did not make it economical to pump a couple BBL per day. Once sand and debris is removed and the pumps reactivated, these wells should have no issues other than routine servicing to produce at their normal levels for a very long time. This would apply to the majority of the wells, I believe.
Some wells might merit refrac and/or acid treatment to stimulate flow. The stimulated flows will last for weeks or even months before settling back to normal levels. Cost is higher, but the anticipated increased production on wells treated this way more than offsets the costs.
That's about as specific as I can get without knowing the specific condition of the wells that WRNW is dealing.
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