China s Downhole Drilling Methods

How to exploit efficiently unconventional hydrocarbon has become an important step to solve the problem of increasing reserve and production of oil & gas in China. Aiming at unconventional oil & gas well e. [pdf]

Drilling pilot holes with down-the-hole drill

As the old saying goes, “Measure twice, cut once.” That truism can apply, too, to drilling pilot holes: Before touching drill bit to wood, take the time to measure carefully and mark the spot where the pilot hole b. [pdf]