The first oilmen after Drake built their derricks out of what ever materials could be obtained locally and each one was unique. But as the industry boomed and oil well supply companies sprang up, certain standard designs evolved so that by 1875 oil fields around the world appeared much the same. The "Pennsylvania" standard rig was the first industry standard.
Originally built of wood with a 65-foot to 85-foot tall derrick, they were well designed to drill to 2000 feet. Plans and specifications along with all of the hardware were available from a number of sources. Iron replaced wood, and other modifications were introduced to enable oilmen to drill faster and deeper.
Our standard rig represents the epitome of cable tool rig design and was capable of drilling to over 5000 feet.
(The above information copied from the Drake Well Brochure)