In the front of this Nabors Land Drilling Rig can be seen two white oil field service trucks inspecting the production casing that can be seen stacked on the pipe racks to the left. 

Production casing is the pipe that is run into the bore hole after the rig has "TD'ed", an oilfield acronym that stands for "total depth".  When a rig "TD's" it has reached its targeted drilling depth.  This rig is "stacking" it's drill pipe in the derrick so it hasn't reached it's "TD".  Drill pipe is pulled for various reason during drilling operations, one of which is to change the drill bit.

The drill string is pulled out of the bore hole in segments of three(3) 30' foot drill pipes that are stood in the derrick in what are known as "stands" which are seen as the dark vertical column in the right hand side of the derrick.  This process is called "tripping" pipe which is derived from the 3 drill pipes that are still connected and pulled out as one segment for the sake of speed and productivity.

The production casing will be cemented into place by a oilfield cement contractor such as Halliburton or Schlumberger which will  pump cement down through the production casing and out the bottom thereby forcing it up around the outside of  casing to the surface.  When this step is finished the drilling rig's job is done.  The rig will be "rigged down" or disassembled and moved to its next drilling prospect.

This Nabors land drilling rig can be seen bellowing out a black cloud of diesel exhaust as it's three diesel motors labor to pull its drill string out of the bore hole.

This rig is "stacking" it's drill pipe in the derrick so it hasn't reached it's "TD".  Drill pipe is pulled for various reason during drilling operations, one of which is to change the drill bit.

The drill string is pulled out of the bore hole in segments of three(3) 30' foot drill pipes that are stood in the derrick in what are known as "stands" which are seen as the dark vertical column in the right hand side of the derrick.  This process is called "tripping" pipe which is derived from the 3 drill pipes that are still connected and pulled out as one segment for the sake of speed.

This photo of a Nabors Drilling rig is shown with a watercolor effect applied.  This picture was taken as the rig was "coming out of the hole" or pulling its drill string out of the bore hole.

A Nabors Drilling land  rig on the prairie of western North Dakota.