#19, very innovative concept, go with this over #17 or #2. Try Quartz Oil Exploration in a different font, and put the logo to the side of the name (left) and make it smaller. Thank for for brilliant concept!
#55, wow, great improvements! Push together the graphic with the name of the company a little, they're a little too far apart, try a couple of other fonts?
#68, Please take the shaft of the drill and extend it up so there is no black above it (except as it is outlined), and make the tiered bit more pronounced, the corners are harder to see with a smaller logo, but I think it needs to be left of the letters just as it is. Thanks!