Pressure exerted by a static column of fluid, depending on its density and vertical height.
Vertical distance from surface to a given point; used for all pressure calculations.
Length of the wellbore along its trajectory; used for calculating volumes and tubular lengths.
Influx of formation fluids into the wellbore when bottomhole pressure falls below formation pore pressure.
Uncontrolled flow of wellbore fluids to surface or into an underground formation.
Wellhead valve assembly used to shut in the well in the event of a kick.
Elastomeric packing element that seals around almost any pipe shape or diameter.
Rams designed to seal around a specific pipe diameter.
Shear through the pipe and fully shut in the wellbore.
Drill string pressure measured after shut-in, used to calculate formation pressure and kill mud weight.
Pressure in the annulus after shut-in, directly affected by the type and volume of the influx.
Mud weight required to balance formation pressure: MW + SIDPP ÷ (0.052 × TVD).
Maximum surface pressure permitted before fracturing the weakest formation at the casing shoe.
Reduction in bottomhole pressure caused by pulling the drill string too quickly.
Increase in bottomhole pressure caused by running the drill string too quickly.
Small, calibrated tank used to accurately monitor wellbore displacement and fill-up during trips.
Upward movement of gas in a shut-in well, carrying its pressure toward the surface.
Bleeding off calculated mud volumes to maintain constant bottomhole pressure during gas migration.
Continuous length of steel tubing spooled on a reel, deployed into live wells without making pipe connections.
Pushes the CT into the well and pulls it back out using gripper chains.
Seals around the pipe during movement to contain well pressure.
Solid metal wire without electrical conductors used to run mechanical tools.
Armored cable transmitting power and data for logging and perforating operations.
Pressure-retaining tubulars mounted on the wellhead to introduce tools under pressure.
Tool that delivers upward or downward impacts during wireline operations.
Running and pulling jointed pipe under well pressure.
Operation to repair or replace the completion string to restore well production.
Cemented pipe strings that protect the borehole wall and isolate formations.
Conduit through which produced fluids flow to the surface.
Isolates the annulus from the production conduit.
Assembly of valves installed on the wellhead to control production.
Mix of cement, water, and additives pumped into the well.
Granular material that holds fractures open after hydraulic fracturing.
Vessel that separates gas, oil, and water by gravity differences.
Captures liquid droplets prior to the gas outlet.
Percentage of water in the total produced liquid volume.
Standard volume of gas produced per unit volume of oil.
Temperature at which paraffin wax crystals begin to form.
Measurement of natural radioactivity, typically high in shales.
Detects casing collars for precise depth correlation.
Tools measuring velocity, density, and temperature to determine zonal production contributions.
The ability of a rock to transmit fluids, measured in mD.
Percentage of void space in a rock.
An orifice that controls flow rate and creates a pressure drop.