A set of controls, usually placed on the rig floor, that is manipulated to control the amount of drilling fluid being circulated through the choke manifold.
This procedure is necessary when a kick is being circulated out of a well.
See choke manifold.
All the devices used to accomplish the moving of sucker rods form the elevators to the racking platform.
A worker on a drilling or workover rig, subordinate to the driller, whose primary work station is on the rig floor.
On rotary drilling rigs, there are at least two and usually three or more rotary helpers on each crew.
Sometimes called floor man, roughneck, or rig crewman.
The average pressure within the reservoir at any given time.
Determination of this value is best made by bottomhole pressure measurements with adequate shut-in time.
If a shut-in period long enough for the reservoir pressure to stabilize is impractical, then various techniques of analysis by pressure buildup or drawdown tests are available to determine static reservoir pressure.
A length of pipe whose bottom edge is serrated or dressed with a hard cutting material and that is run into the wellbore around the outside of stuck casing, pipe, or tubing to mill away the obstruction.
A drilling bit made of two, three, or four cones, or cutters, that are mounted on extremely rugged bearings.
The surface of each cone is made of rows of steel teeth or rolls of tungsten carbide inserts.
Also called rock bits.
A measure of the speed at which the bit drills into formations, usually expressed in feet (meters) per hour or minutes per foot (meter).
A small plug that is run through a flow line by pressure to clean the line or test for obstructions (see pig).
Abbreviation: run-in-hole.
A small platform with finger-like steel projections attached to the side of the mast on a well servicing unit.
When a string of sucker rods or tubing is pulled from a well, the top end of the rods or tubing is placed (racked) between the steel projections and held in a vertical position in the mast.
The portion of oil, gas, and minerals retained by the lessor on execution of a leases or their cash value paid by the lessee to the lessor or to one who has acquired possession of the royalty rights, based on a percentage of the gross production from the property free and clear of all costs except taxes.
A sub in a dst string in which pressure and temperature recorders are placed for formation evaluation.
The principal component of a rotary, or rotary machine, used to turn the drill stem and support the drilling assembly.
It has a beveled gear arrangement to create the rotational motion and an opening into which bushings are fitted to drive and support the drilling assembly.
See rotary helper
A special type of elevator designed to accommodate the end of a sucker rod.
It allows the derrickman to transfer the rod to the racking platform from the regular elevator being used to lift the rod out of the well.