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STOIIP refers to the total quantity of oil in the reservoir prior to production. It's crucial for designing appropriate recovery methods and estimating the economic viability of a project.

Wax Appearance Temperature is the temperature at which paraffin wax starts to precipitate from crude oil affecting the flow properties. It's significant in preventing blockages in pipelines and equipment.

An emulsion in petroleum engineering is a mixture of two immiscible liquids, such as crude oil and water. It's significant in production as it can affect flow properties and requires treatment.

Surfactant flooding is an enhanced oil recovery technique that uses chemicals to lower the interfacial tension between oil and water, improving oil mobility and recovery.

Compressibility is a measure of the change in volume of a fluid or rock with pressure changes and affects the estimation of original hydrocarbons in place (OHIP).

Live oil contains dissolved gas and is under reservoir pressure, influencing its flow characteristics. Understanding live oil properties is essential for predicting production behavior.

WAG Injection is an enhanced oil recovery process that alternates between injecting water and gas to maximize oil displacement and improve recovery efficiency.

Porosity is the measure of the void spaces in a material, and it’s important in petroleum engineering because it dictates how much hydrocarbons a rock can hold.

Hydrate formation occurs when water and natural gas mix at high pressure and low temperature, forming ice-like solids that can plug pipelines and equipment.

The API Gravity is a measure of how heavy or light a petroleum liquid is compared to water. It is significant as it influences the economic value of the crude, with higher values indicating lighter oils that are typically more valuable.

The Gas-Oil Ratio is the volume of gas that comes out of solution from a volume of oil at standard conditions and is key in characterizing the type of oil reservoir.

Oil saturation is the fraction of a rock's pore volume occupied by oil and it determines the potential yield of a reservoir.

GOR is the amount of gas that can dissolve in oil under reservoir conditions and is important for determining the recovery strategy and surface facilities needed.

Dead oil refers to crude oil that has had all of its associated natural gas removed, typically found in a tank at atmospheric pressure and room temperature. It's important for laboratory PVT analysis.

Asphaltenes are high molecular weight hydrocarbons found in crude oil, that can precipitate and cause wellbore plugging and flow assurance issues.

Scale formation occurs when mineral salts precipitate out of produced water and deposit on the equipment surfaces, leading to blockage and corrosion issues.

The bubble point pressure is the pressure at which gas begins to come out of solution in oil. It's crucial for maintaining a reservoir's pressure and preventing gas production.

Thermal Recovery is a method to improve heavy oil production by heating the reservoir, thus reducing oil viscosity. Its significance lies in the enhancement of oil recovery.

FVF is the ratio of the volume of oil at reservoir conditions to the volume of oil at standard conditions. It is essential in calculating hydrocarbon reserves and flow rates.

The Recovery Factor is the percentage of oil or gas in place that is technically and economically recoverable. It is used to estimate how much resource can be produced.

Relative permeability is the measure of a fluid's ability to flow in a reservoir relative to its ability to flow without any other fluids present. It's key for multiphase flow simulation.

CGR is the amount of liquid condensate produced per unit volume of gas produced and is essential for determining the value of the well stream and designing surface facilities.

Viscosity describes a fluid's resistance to flow and significantly affects the production rate and recovery efficiency in petroleum engineering.

OGIP is the total amount of gas present in a reservoir before production. It's important for reserve estimations and determining the lifespan of a gas field.

Permeability is a measure of the ability of a porous rock to allow fluids to pass through it. It is crucial in assessing a reservoir's productivity.

The flash point is the lowest temperature at which the vapor of a combustible liquid forms an ignitable mixture with air. It's important for safety and regulatory compliance in handling petroleum products.

Gas condensate is a low-density mixture of hydrocarbon liquids present as gaseous components in raw natural gas and condenses out when pressure drops. Important for designing processing facilities.

Acid gas is a mixture of hydrogen sulfide (H2S) and carbon dioxide (CO2) that is commonly found in raw natural gas and must be removed due to its corrosive and toxic nature.

Oil-Water Contact is the level at which the oil zone and water zone meet in a reservoir. It influences the estimation of hydrocarbon volumes and their recoverability.

Pressure-Volume-Temperature (PVT) Analysis is the study of fluid properties under varying conditions of pressure, volume, and temperature. Critical for the design of all phases of oil and gas production.

Artificial lift is a method used to increase pressure within the reservoir and boost fluid removal when the reservoir does not have enough pressure to produce naturally.

Abandonment Pressure is the reservoir pressure at which a well is no longer economically viable to produce. It's determined by economic limits and the cost of lifting fluids to the surface.

Reservoir Temperature is a fundamental property affecting fluid phase behavior, viscosity, and density within the reservoir, impacting the overall production strategy.

Water Cut is the ratio of water produced compared to the total volume of liquids produced. High WC can indicate that a reservoir is nearing its economic limit.

Capillary pressure is the pressure difference across the interface of two immiscible fluids in a porous medium and it affects fluid distribution in a reservoir.

Enhanced Oil Recovery refers to techniques used to increase the amount of crude oil that can be extracted from an oil field, going beyond the capabilities of primary and secondary recovery.