Presenters
Clyde H. Lietzow, Lietzow Equipment Company
During the past eighteen years the hydraulic long stroke pumping unit has made an ever increasing entrance into the crude oil production picture. In 1939, two hydraulic long stroke units made their appearance in the oil fields. In the early days of the hydraulic unit, as is true with other new types of equipment, there was a great deal to be learned by the manufacturer's as well as the operators. Often the operator of the early hydraulic long stroke unit felt fortunate if he had a four or five day trouble free period. Nevertheless, the deep wells with high volumes presented problems to the producers which they realized had to be solved.