well, according to scramble, the J-11B are appearing in quite a few regiments.
we all know about the 1st division J-11B
According to them, the 30th division will also get J-11B. Huitong's site has a picture of a 30th division J-11B. This should be the much talked about Pulandian (PLD) regiment.
They also state that the 19th division has J-11 and J-11BS (also verified in photos). My belief is that the J-11BS are serving as trainers here and we probably won't see J-11B replacing the J-11 until a later point.
We got the photos of J-11BS joining the 37th division and one of the more respected posters on Chinese bbs stated that this was planned a couple of years ago. So, I think we can safely assume a new full J-11B/S regiment here.
They also stated the appearance of J-11B/S in 6th division at Lintao. Now, it is possible that this regiment was there temporarily and has been moved to 30th or the 37th division since.
And of course, there is also the PLANAF J-11B regiments.
So, assuming that J-11BS get used interchangeably with Su-27UBK and there are about the right ratio of J-11B to J-11BS overall. We would have at least 3 PLAAF + 1 PLANAF J-11B regiments. There is also the possibility of an additional PLAAF regiment in 6th division. Now, it seems that the conversion is not complete. But even a conservative estimates would put the number of J-11B at over 70 and probably less than 100. That would also indicate that they have produced quite a few WS-10A engines recently. At this pace, they will exceed the flankers license in no time.