Page 109 - TTEG 19th Edition Directory 2021
P. 109

  • OPEN HOLE: Uncased part of a well.
• OPERATOR: Person, whether proprietor or lessee, who actually operates the well. Generally, the oil
company by whom the drilling contractor is engaged.
• PAY, PAY SAND, OR PAY SECTION: Producing formation, or that formation which represents the objective
of drilling.
• PENETRATION, RATE OF: Rate at which the drill bit proceeds in the deepening of the wellbore and
usually expressed as feet (meters) per hour.
• PERFORATE: To pierce holes through well casing within an oil or gas-bearing formation by means of a
perforating gun lowered down the hole and fired electrically from the surface. The perforations permit
production from a formation which has been cased off.
• PERMEABILITY: Capacity of a porous rock formation to allow fluid to flow within the interconnecting
pore network.
• PIPE: Oilfield tubular goods such as casing, drill pipe, tubing, or pipeline.
• PIPE RACK: Series of parallel heavy wooden or steel bents secured in place by bracing on which pipe is stored.
• PLUG: Object or device that serves to block a hole or passageway such as a cement plug in a borehole.
• PLUG AND ABANDON: Act of placing cement plugs in a hole to prevent unwanted vertical migration in
an abandoned well.
• POROSITY: Volume of pore spaces between mineral grains expressed as a percentage of the total rock
volume. Thus porosity measures the capacity of the rock to hold oil, gas, or water.
• POTENTIAL: Actual or maximum volume of oil and/or gas that a well is capable of producing.
• PRODUCTION: The operation of bringing the well fluids to the surface and separating them, and storing,
gauging, and otherwise preparing product for the pipeline.
Also refers to the amount of oil or gas produced over a given period.
• RATHOLE: Shallow bore under the derrick substructure in which the kelly joint is temporarily set while
making a connection.
• RELIEF WELL: Well drilled at an angle from a point close to a “wild” well that will intercept the original
well as part of control procedure.
• RESERVOIR: Porous, permeable sedimentary rock structure or trap containing oil and/or gas.
A reservoir can contain more than one pool.
• RIG: The derrick, drawworks, and attendant surface equipment of a drilling or workover unit.
(Several types of rigs should be included such as deep shallow, stratigraphic, etc.)
• RIGGING UP: Act of getting a rig assembled and ready to start drilling.
• ROTARY DRILLING: Method of drilling in which the drill pipe is rotated to rotate a bit.
• ROTARY TABLE: Equipment over the wellbore which transfers power from the engines to produce a rotary
motion. Via bushings and gears the rotary motion is transferred to the kelly and through to the drill string.
• ROTATING BOTTOM: Making hole.
• ROUGHNECK: Industry slang for floorhand.
• SAFETY WIRE: Steel cable attached to the monkey board and anchored to the ground at some distance from
the rig. It is used by the derrickhand to slide clear of danger in an emergency.
• SANDFRAC: Method of fracturing subsurface rock formations by injection of fluid and sand under high
pressure to increase permeability. Fractures induced in the rock by the hydraulic pressure are kept open by the grains of sand.

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