- Branża: Oil & gas
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A neutron interaction in which the kinetic energy lost by a neutron in a nuclear collision is transferred to the nucleus. The energy of a neutron is reduced more efficiently in collisions with nuclei of similar mass to the neutron, like hydrogen and other elements of low atomic mass. Elastic neutron scattering is one of the main principles behind the neutron porosity log, as well as the pulsed neutron capture log, which is mainly used to determine water saturation behind casing.
Industry:Oil & gas
A multiphase-fluid flow regime characterized by a series of liquid plugs (slugs) separated by a relatively large gas pockets. In vertical flow, the bubble is an axially symmetrical bullet shape that occupies almost the entire cross-sectional area of the tubing. The resulting flow alternates between high-liquid and high-gas composition.
Industry:Oil & gas
A multirate test designed as a series of drawdown and buildup sequences at different drawdown flow rates, with each drawdown and buildup of the same duration. The purpose of the test is to determine well deliverability, and this type of test is most commonly done in gas wells.
Industry:Oil & gas
A multirate test designed as a series of drawdown and buildup sequences at different drawdown flow rates, with each drawdown of the same duration and each buildup reaching stabilization at the same pressure as at the start of the test. The purpose of the test is to determine well deliverability. This type of test is most commonly done in gas wells.
Industry:Oil & gas
A natural gas liquid with a vapor pressure intermediate between condensate and liquefied petroleum gas. This liquid hydrocarbon mixture is recovered at normal pressure and temperature and is much more volatile and unstable than commercial gasoline.
Industry:Oil & gas
A near-wellbore area where injected fluids such as acids can restore original permeability. Most of the reservoir pressure drop during production occurs in this near-wellbore part of the reservoir.
Industry:Oil & gas
A multiphase-fluid flow regime characterized by a chaotic mixture of liquid and gas, with neither phase appearing to be continuous. Also known as churn flow, transition flow is an intermediate flow condition between slug flow and mist flow.
Industry:Oil & gas
A multiphase-flow regime in horizontal or near-horizontal wells in which the fluids are separated into different layers, with lighter fluids flowing above heavier fluids. Stratified flow is more likely to occur at low flow rates and in flat or downhill sections of horizontal wells. In uphill sections, and as the flow rate increases, the interface between the fluids becomes mixed and irregular, hence the term wavy stratified flow is often used.
Industry:Oil & gas
A multiphase-flow regime with oil as the continuous phase, in which water exists as small, approximately homogeneously distributed droplets. There may also be a thin film of water on the pipe wall.
Industry:Oil & gas
A multiphase fluid-flow regime characterized by the gas phase being distributed as bubbles through the liquid phase. In a producing wellbore where the bubbles are uniformly distributed, there is little relative motion between the phases. Where the bubbles congregate and combine to form a less uniform distribution of the gas phase, some slippage will occur between the phases with the gas tending to cut through the liquid phase.
Industry:Oil & gas
