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AssigneesTea Sistemi S.P.A., ENI S.p.A.
InventorsStefano Boschi, Paolo Andreussi
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An apparatus for measuring a multiphase fluid stream which flows in a pipe (2) comprising: a measuring unit (11), coaxial to the pipe, consisting of an isokinetic sampling device (1) suitably configured for allowing the equidistribution of the flow at the inlet in n channels (6) having an area A, of which m are sampling channels and a flow restriction (13) both equipped with differential pressure measuring means (12, 14), a phase separator (15), connected to the sampling device, measurers and regulation means downstream of said separator. A method in accordance with said apparatus which comprises: the isokinetic sampling of a portion q of the multiphase flow Q at the inlet, measuring the flowrates of the liquid qL and gas qG of the portion sampled and calculating the liquid and gas flow-rates (QL and Q0) from the sampling sections according to the equations QG=n/tn qG and QL=n/m qL. The method provides isokinetic sampling for portions of flow removed ranging from 5% to 20%.
An apparatus for measuring the liquid and gas flow-rates QL and QG in a multiphase stream which flows in a pipe (2), comprising
The measuring apparatus according to any of the previous claims, wherein said distribution body comprises an annular support (4) axially fixed inside said cylindrical section (3b) of the tubular body (3) and a rotation solid (5) positioned coaxially inside said annular support (4) and comprising two substantially conical ogives (5a, 5b) extending axially above and below said annular support (4) respectively inside the upper half of the cylindrical section (3b) and the divergent section (3a) and inside the lower half of the cylindrical section (3b) and the convergent section (3c) of the tubular body (3).
The measuring apparatus according to any of the previous claims, wherein said n channels, of which m are sampling channels, (6a, 6b), are situated along said annular support (4) equidistanced angularly and equi-distributed and having an equal section.
The measuring apparatus according to any of the previous claims, wherein said differential pressure measuring means (12) have pressure measuring points (7a, 7b) in correspondence with said first sections (6a1, 6b1) of non-sampling channel (6a, 6b).
The measuring apparatus according to any of the previous claims, wherein the length of said first sections (6a1, 6b1) of channels (6a, 6b) is equal to 8-10 times the diameter of said channels.
The measuring apparatus according to any of the previous claims, wherein the ratio between the area of the flow section of the sampled fraction A2 and the area of the flow section of the total multiphase mixture A1 is equal to the ratio between said number m of sampling channels (6b) and said total number n of channels (6).
The measuring apparatus according to any of the previous claims, wherein said ratio between the areas A1 with respect to A2 is variable within a range of 5 to 20% by varying the ratio between said total number of channels n and said number of sampling channels m.
The measuring apparatus according to any of the previous claims, wherein opening/closing means (20) are provided on the liquid fraction leaving said separator means (15) to effect discontinuous measurements of the liquid flow-rate through a level measurer (21) associated with said separator means (15).
A method for measuring the liquid QL and gaseous QG flow-rates in a multiphase stream with a flow-rate Q which flows inside a pipe (2), comprising:
Dependencies are inferred from the claim text.