Oil and Gas Terms Beginning with "P"

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A compressional or primary seismic wave in which particle motion is parallel to the direction of wave propagation; P-waves travel faster than S-waves and can propagate through all materials including fluids, making them the primary wave type used in seismic exploration.

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A mechanical mixing device used on the rig surface to agitate and homogenize drilling fluid in the mud pit, consisting of motor-driven paddles that maintain solids in suspension and ensure uniform distribution of chemical additives throughout the mud system.

An oil and gas lease in which all delay rental payments have been made in advance as a lump sum at the time of lease execution, eliminating the need for annual delay rental payments to keep the lease in effect during the primary term.

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A crude oil containing a high proportion of straight-chain (paraffinic) hydrocarbon molecules with relatively little aromatic or naphthenic content; paraffin base crudes tend to have high wax content and pour points but yield good-quality lubricating oils.

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A unit of concentration equal to one part of a substance per one billion parts of the total mixture by weight or volume (1 ppb = 0.001 ppm); used in oilfield water analysis and environmental monitoring to measure trace concentrations of contaminants or dissolved species.

A unit of concentration equal to one part of a substance per one million parts of the total mixture by weight or volume; commonly used in oilfield water analysis, produced water characterization, and environmental monitoring for dissolved solids, ions, and contaminants.

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The SI unit of pressure equal to one newton per square meter (N/m²); in oilfield applications, pressures are commonly expressed in kilopascals (kPa) or megapascals (MPa), with one psi equal to approximately 6.895 kPa.

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A section of casing, liner, or tubing installed to cover or bypass a damaged, corroded, or perforated interval in the wellbore, restoring pressure integrity and allowing the well to continue producing or injecting without a full workover.

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A chemical added to drilling fluids, completion brines, and workover fluids to inhibit bacterial growth that could cause souring of the reservoir, biogenic H₂S production, or degradation of polymer additives in the fluid system.

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A test performed to verify that the wellbore, casing shoe, and open formation can withstand a specified pressure without fracturing or leaking; integrity tests include leak-off tests (LOT) and formation integrity tests (FIT) conducted after drilling to a new casing point.

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A graphical method used in gas well testing that plots pressure squared (p²) versus time to linearize the flow equations for low-pressure gas reservoirs, allowing determination of permeability, skin, and reservoir boundaries from the straight-line portions of the plot.

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A well testing discipline that interprets changes in wellbore pressure with time after changes in flow rate to characterize reservoir properties including permeability, skin damage, reservoir boundaries, and average reservoir pressure.

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A category of well testing procedures that measure and analyze the pressure response of a reservoir to changes in production or injection rate, including buildup tests, drawdown tests, interference tests, and pulse tests used to evaluate reservoir properties.

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In production logging, the process of investigating the wellbore or near-wellbore region by running a probe or sensor tool against the casing or formation to measure local properties such as temperature, pressure, or radioactivity at specific depth points.

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A production logging technique in which a tool is moved continuously through the wellbore while recording measurements such as temperature, noise, gamma ray, or flow rate to create a continuous profile of wellbore conditions along the producing interval.

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In acoustic logging, the travel time of a sound wave pulse through the formation between the transmitter and receiver transducers; propagation time measurements are used to determine formation porosity and identify lithology through sonic log interpretation.

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The operation of removing the drill string, completion string, or any downhole tool assembly from the wellbore by sequentially disconnecting stands or singles of pipe at surface; abbreviated as POOH, this is a routine operation performed after reaching total depth or when changing the bottom hole assembly.

In seismic data processing, a static or dynamic correction applied to shift seismic reflection events upward in time, typically to correct for near-surface velocity anomalies or to remove the effect of a low-velocity zone that delays arrivals.

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An ultrasonic measurement technique used in cement evaluation and casing inspection logging in which a transducer emits a sound pulse that echoes off the casing wall or cement interface, providing measurements of casing thickness, cement bond quality, and annular fill.

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A production logging tool that uses pulsed neutron activation to measure the holdup (volume fraction) of each fluid phase—oil, water, and gas—in the wellbore, enabling production allocation and fluid entry identification in multiphase flow conditions.

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A condition in artificial lift systems in which the downhole pump draws down the reservoir pressure below the bubble point or to the pump intake, causing gas interference and intermittent pump operation; pump-off is detected by dynamometer analysis and requires adjustment of pumping speed or downtime.

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A surface wellhead fitting with side outlets that allows fluid to be pumped into or out of the well while maintaining a seal around the polished rod or wireline; pumping tees are used in rod-pumped wells to direct produced fluids to the flowline.

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In directional drilling, a push-down tendency refers to the inclination of the bottom hole assembly to build angle downward; also used in hydraulic fracturing to describe fracture propagation downward from the wellbore due to stress regime or formation characteristics.

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In directional drilling, a component or bottom hole assembly configuration that applies a lateral force to push the bit in a specific direction; pushers include hydraulically actuated pads, bent housings, and steerable motor configurations used to achieve desired wellbore trajectory.

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A dispersant and thinner used in water-based drilling fluids, particularly chrome-free systems; sodium pyrophosphate and tetrasodium pyrophosphate break up clay flocs and reduce viscosity by sequestering calcium and other divalent cations that promote flocculation.

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