Page 110 - TTEG 19th Edition Directory 2021
P. 110

• SCRATCHER: Steel, wire-fingered device fastened to the casing which removes the mud cake from the hole to condition it for cementing.
• SEISMOGRAPH: Apparatus used to measure and record vibrations in the earth It is used to detect possible oil-bearing structures.
• SET CASING: Installation of steel pipe or casing in a wellbore, normally cemented in place by surrounding it with a wall of cement.
• SIDE TRACKING: Drilling past an obstruction in the hole, usually done using a special tool known as a whipstock.
• SINGLE: One joint of drill pipe.
• SLIM HOLE DRILLING: Drilling in which the hole size is smaller than the conventional hole diameter, enabling
the operator to run smaller casing, thereby decreasing the cost of completion.
• SPECIFIC GRAVITY: Ratio of weight of any substance to weight of equal volume of another substance, usually
water as the standard for solids and liquid.
• SPUD OR SPUDDING IN: Commencement of actual drilling of well.
• STABILIZER: A centralizer installed in the drill string to center the string in the hole and to stiffen the string to
resist bending and deviation.
• STAND OF PIPE: Two, three, and sometimes four joints of pipe fastened together, called a double, thribble,
or fourble, respectively.
• STEP-OUT WELL: Well drilled adjacent or near to proven well to ascertain the limits of the reservoir.
• STRATIGRAPHIC TRAP: Subsurface formation created by sedimentation that might trap an accumulation of oil
and/or gas.
• STRING: The entire length of casing, tubing, or drill pipe.
• STRUCTURE: Subsurface geological feature capable of acting as a reservoir for oil and/or gas.
• STUCK PIPE: Drill pipe, casing, or tubing that cannot be worked in or out of the hole as desired.
• SUBSTRUCTURE: Foundation on which the derrick and engines sit. Contains space for storage and well control
• SURFACE CASING: First string of casing set in well.
• SWABBING: Operation using a swab to bring well fluids to the surface when the well does not flow naturally.
• SYNCLINE: Trough-shaped subsurface structure of folded stratified rock. Opposite of anticline.
• TIGHT HOLE: Drilling a well in which the information obtained is restricted and passed only to those
authorized to receive it.
• THRIBBLE: Stand of pipe made up of three joints handled as a unit.
• TOOLPUSHER: Foreman in charge of the drilling rig operations and crew members.
• TOTAL DEPTH (TD): Maximum depth reached in a well.
• TOUR: Work shift of a drilling crew, usually pronounced as though it were spelled t-o-w-e-r.
• TRAP: Any geological structure which precludes the migration of oil and gas through subsurface rocks,
causing the hydrocarbons to accumulate into pools.
• TRIPPING: Making a trip; operation of hoisting pipe out of, and returning it to, the wellbore.
• TURBODRILL: Downhole assembly of bit and motor in which the bit alone is rotated by means of fluid turbine
which is activated by the drilling mud. The mud turbine is usually placed just above the bit.

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