Found this:

http://www.airpower.maxwell.af.mil/a...aug/becker.htm

Grozny and Baku, however, were never captured, and only Maikop yielded to German exploitation. As was the case in all areas of Russian production, the retreating forces had done a thorough job of destroying or dismantling the usable installations; consequently, the Germans had to start from scratch. In view of past experience with this type of Russian policy, such destruction was expected, and Field Marshal Hermann Göring’s staff had begun making the necessary preparations in advance. But a shortage of transport that was competing with military requirements, a shortage of drill equipment as well as drillers, and the absence of refining capacity at Maikop created difficulties in getting any oil. ( in Jan 1943 at Maikopi they did get some minor amounts for a short time ).

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