- Industry: Oil & gas
- Number of terms: 8814
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The source of power for the rig location. On modern rigs, the prime mover consists of one to four or more diesel engines. These engines commonly produce several thousand horsepower. Typically, the diesel engines are connected to electric generators. The electrical power is then distributed by a silicon-controlled-rectifier (SCR) system around the rigsite. Rigs that convert diesel power to electricity are known as diesel electric rigs. Older designs transmit power from the diesel engines to certain rig components (drawworks, pumps and rotary table) through a system of mechanical belts, chains and clutches. On these rigs, a smaller electric generator powers lighting and small electrical requirements. These older rigs are referred to as mechanical rigs or more commonly, simply power rigs.
Industry:Oil & gas
The slang abbreviation for synthetic. The term can be confusing to the uninitiated, so its use is avoided.
Industry:Oil & gas
The situation in which 10-second and 10-minute gel strengths for a drilling mud have similar values. Flat gels indicates that the mud will remain pumpable with time if left static in the hole. However, if gel values are too low, barite sag or solids settling is likely.
Industry:Oil & gas
The situation in which 10-second and 10-minute gel strengths for a drilling mud have dissimilar values, with the 10-minute number being much higher than the 10-second number. This indicates that the gelation of the mud is rapidly gaining strength with time, which generally is an undesirable feature of a mud. The mud may require excessive pump pressures to break circulation. If gels appear to be too progressive, a 30-minute gel-strength measurement may be warranted as a third check of progress.
Industry:Oil & gas
The simplest aldehyde, having the formula HCHO. Formaldehyde is used in aqueous solutions as a preservative. In muds, paraformaldehyde is added to protect against bacterial attack. The formaldehyde test determines the paraformaldehyde (bactericide) content of a drilling fluid by a P-alkalinity titration of a sulfite-oxidized mud filtrate.
Industry:Oil & gas
The shear stress measured at low shear rate after a mud has set quiescently for a period of time (10 seconds and 10 minutes in the standard API procedure, although measurements after 30 minutes or 16 hours may also be made).
Industry:Oil & gas
The SI unit of measurement for density. Mud weights are typically expressed in kg/m<sup>3</sup>. The conversion factor from lbm/gal to kg/m<sup>3</sup> is 120. For example, 12 lbm/gal = 1440 kg/m<sup>3</sup>.
Industry:Oil & gas
The set of valves, spools and fittings connected to the top of a well to direct and control the flow of formation fluids from the well.
Industry:Oil & gas
The set of sheaves that move up and down in the derrick. The wire rope threaded through them is threaded (or "reeved") back to the stationary crown blocks located on the top of the derrick. This pulley system gives great mechanical advantage to the action of the wire rope drilling line, enabling heavy loads (drillstring, casing and liners) to be lifted out of or lowered into the wellbore.
Industry:Oil & gas
