- 行业: Oil & gas
- Number of terms: 8814
- Number of blossaries: 0
- Company Profile:
A device for determining the water holdup in a producing well by measuring the capacitance or impedance of the fluid. The term is a misnomer because water cut is not the same as water holdup except in the unlikely case where all phases flow at the same velocity. Since hydrocarbons travel faster than water in a production well, the water holdup is larger than the water cut. However, the water-cut meter was often combined with a flowmeter so that the water cut could be estimated by combining the two measurements.
Industry:Oil & gas
A device for determining the water holdup in a producing well by measuring the capacitance or impedance of the fluid. The holdup meter is used to produce a capacitance log. Since water has a high dielectric constant, and hence capacitance, it can be distinguished from oil or gas. The meter is a coaxial capacitor, with fluid flowing between a central probe and an external cage that act as electrodes. The meter has often been combined with a packer flowmeter or a diverter flowmeter, so that all the fluids in the well pass through the meter.
Industry:Oil & gas
A device fitted with a hinged collar and bowsprings to keep the casing or liner in the center of the wellbore to help ensure efficient placement of a cement sheath around the casing string. If casing strings are cemented off-center, there is a high risk that a channel of drilling fluid or contaminated cement will be left where the casing contacts the formation, creating an imperfect seal.
Industry:Oil & gas
A device dropped or pumped through a tubing or coiled tubing string to activate downhole equipment and tools.
Industry:Oil & gas
A device fitted in surface treatment lines that helps distribute a liquid foamer phase in a stream of nitrogen gas. The foam generator creates a consistent mixture that becomes a stable foam under downhole pressure and temperature conditions.
Industry:Oil & gas
A design feature on packers and similar downhole tools that occupy a large proportion of the drift diameter of the wellbore. When running and retrieving such tools, the hydraulic bypass allows the wellbore fluid to flow through part of the tool assembly to reduce the forces applied to the tool and reduce any damaging swab or surge effect on the reservoir formation.
Industry:Oil & gas
A device attached to the topmost tubing joint in the wellhead to support the tubing string. The tubing hanger typically is located in the tubing head, with both components incorporating a sealing system to ensure that the tubing conduit and annulus are hydraulically isolated.
Industry:Oil & gas
A description of the internal area and surfaces of a tool or tubular assembly through which there is an unimpeded internal diameter. In some cases, fullbore is used to describe the form of a nominal internal diameter that extends over the length of the tool or interval without any variation. In other applications, the term simply implies an ability to pass a ball or similar item of a stated drift diameter through the assembly.
Industry:Oil & gas
A description of reservoir conditions under which a fluid, previously isolated or separated from production, gains access to a producing wellbore. The term is most commonly applied to water or gas breakthrough, where the water or gas injected to maintain reservoir pressure via injection wells breaks through to one or more of the producing wells.
Industry:Oil & gas
