18 July 2017

Stratification

The natural layering or lamination characteristic of sediments and sedimentary rocks.
18 July 2017

Stratigraphic trap

A petroleum trap that occurs when the top of the reservoir bed is terminated by other beds or by a change of porosity or permeability within […]
18 July 2017

String

The entire length of casing, tubing, sucker rods, or drill pipe run into a hole.
18 July 2017

String up

To thread the drilling line through the sheaves of the crown block and traveling block. One end of the line is secured to the hoisting drum […]