Mr. Erik Milito - The House Committee on Natural Resources ...

ISOLATING POTENTIAL FLOW ZONES DURING WELL CONSTRUCTION 9
3.1.51
production riser
<strong>The</strong> casing string(s) rising from the seafloor to the wellhead on fixed platforms or the casing string(s) attached to the
subsea wellhead rising from the seafloor to the surface wellhead on hybrid wells.
3.1.52
production tubing
Tubing that is run inside the production casing and used to convey produced fluids from the hydrocarbon bearing
formation to the surface. Tubing may also be used for injection.
3.1.53
pressure while drilling
PWD
<strong>The</strong> measurement of downhole pressure while drilling by a tool installed in the BHA.
3.1.54
rate of penetration
ROP
Common term for drilling rate; usually expressed in units of ft/hour or m/hour.
3.1.55
static gel strength
SGS
<strong>The</strong> yield stress of fluids at rest.
3.1.56
structural pipe (or casing)
Pipe utilized to facilitate the drilling of a well, but not intended for pressure containment after the well has been drilled.
Supports unconsolidated sediments and provides hole stability for initial drilling operations, axial support for casing
loads and bending loads from the wellhead. See also definition for drive/jet pipe.
3.1.57
subsea wells
Wells drilled and completed with a subsea wellhead located near the seafloor.
3.1.58
subsea wellhead
A wellhead that is located near the seafloor.
3.1.59
surface casing
Casing run to isolate shallow formations.
3.1.60
surface well
A land or offshore well completed on the surface with individual casing heads, tubing head, a surface tubing hanger,
and a surface christmas tree, all residing at a designated level above the water line on a fixed platform.
3.1.61
sustained casing pressure
SCP
Pressure in an annulus of casing strings that is measurable at the wellhead that rebuilds to at least the same pressure
level after pressure has been bled down. SCP is not due solely to temperature induced fluid expansion or a pressure
that has been imposed by the operator. See API RP 90 for further information.