摘要:
The present invention relates to a system for measuring conductivity in a multiphase fluid flow comprising a fraction of water, the system comprising a measuring section including means for emitting electromagnetic signals into a pipe containing said flow within at least one chosen frequency range and means for detecting resonant frequencies within said range. The measuring section comprising features for providing at least two resonanct frequencies within said at least one frequency range, the system also comprising means for based on at least a first resonant frequency and a first Q-factor related to the corresponding resonance peak as well as the Q-factor of a second resonance peak, calculating the conductivity of the water in said flow.
摘要:
The present invention relates to a multiphase meter system for measuring the composition and/or salinity of a fluid flow in a pipe, comprising: • a resonance measuring means including a transmitting antenna (11) for providing varying electromagnetic field within a first frequency range in the pipe and a receiver antenna (12) for measuring the resonance characteristics of the field in said pipe and an evaluation means for determining the quality of said resonance, • a transmission measuring means including a transmitting antenna (11) for transmitting a varying electromagnetic signal within a second frequency range, at least two receiver antennas (12, 13) being positioned at different distances from said transmitter antenna, and a time measuring means for determining the phase difference and difference in measured damping between the receipt of the transmitted signal at said two receiver antennas, and • a control means comparing the resonance quality with a predetermined threshold value and when said resonance quality is above said threshold calculating the composition and/or salinity from said resonance characteristics or when said resonance quality is below said threshold calculating said composition and/or salinity from said transmission phase difference and damping.
摘要:
Downhole gauge (1) assembly comprising a gauge housing (3) with a receiving aperture (32) having a sealing means (30) with an inner sealing surface (8). A gauge (4) is arranged in or in association to the gauge housing (3), a metal cable (7) with an inner bore is in communication with the interior of the housing (3). The cable runs from a downhole location to the top of a subsurface well. An electrical or optical conductor (9a, 9b) runs through the bore of the metal cable. The conductor (9a, 9b) is connected to the gauge (4) through a connector (5). The electrical or optical connector (5) is arranged within the gauge housing (3) and has been passed through said receiving aperture (32) of the gauge housing (3). The inner sealing surface (8) seals on the outer surface of the metal cable (7).
摘要:
Clamp (1, 1') comprising a main body (3, 3') adapted to encircle an inner element (101) or to be encircled by an outer element to which the clamp (1) can releasably connect. An axially extending opening extends through the main body (3, 3'). The clamp comprises a locking arm (5) which is connected to said main body (3, 3') at a base end (7), and which can bend elastically to move its oppositely positioned free end (9) in a substantially radial direction. The locking arm (5) comprises a locking pad (13) at a distance from the base end (7), which in a locking position of the locking arm (5) extends radially beyond an inner (4) or outer (4') diameter, respectively, of the main body (3, 3'). The locking pad (13) is adapted to engage with a recess (113) in said inner (101) or outer (101') element.
摘要:
Insert for electromagnetic resonance measurements, having a substantially unsupported essentially conically or biconically shaped portion and a support structure including at least one fin extending from the insert to a conduit wall or meter body. The at least one fin extends partly into the essentially conically or biconically shaped portion, but only to an extent that does not influence substantially on the electromagnetic resonance measurement. A system including such insert is also described.
摘要:
A subsea pipeline (10) is provided with a valve (11) which can be operated between a closed position and an open position to establish access from the pipeline exterior to the pipeline interior. The valve (11) is provided with a connector (13) adapted to connect to a sampling tool (16) comprising one or more fluid sampling probes (21). During operation, the fluid sampling tool (16) is transported from a surface location by an ROV down to the subsea pipeline (10) and connected to the valve. Then, the ROV opens the valve (11), moves a sampling probe (21) from the fluid sampling tool (16), through the valve (11) and into contact with the fluid within the subsea pipeline (10) to take fluid samples from the same. When the sampling procedure is completed, the probe is returned back to the sampling tool, and the valve is closed. The ROV disconnects the sampling tool and returns the sampling tool (16) to the surface.
摘要:
Method and device for measuring the content of a fluid flow, the fluid containing a combination of at least two of gas, oil and/or water. The method comprising the steps of: - repeatedly measuring the electrical properties of a cross section of the fluid and detecting time sequences identified by low gas content, especially characterized in that a gas bubble is not present, - in said periods of low gas content measuring the density of the fluid in the flow, wherein the density measurements are performed in at least one period of low gas content and the a fluid density is calculated based on the measured densities over said period or periods.
摘要:
Method and device for monitoring a zone (2)of a metal structure (1) in terms of its electrical resistance in order to detect possible defects in the structure, by periodically passing current through the zone in different directions while measuring and recording voltage drops in a number of selected unit areas (a ij ) within the zone (2), and by combining, for each unit area (a ij ), at least two measured values recorded during at least two measurements made with current passing in different directions, and by comparing values obtained by at least one similarly obtained value made earlier.