US 12,378,875 B2
Targeted tracer injection with online sensor
Anton Kulyakhtin, Trondheim (NO); Christian Andresen, Vikhammer (NO); and Thomas Sperle, Jakobsli (NO)
Assigned to RESMAN AS, Trondheim (NO)
Filed by RESMAN AS, Trondheim (NO)
Filed on Aug. 12, 2022, as Appl. No. 17/887,230.
Application 17/887,230 is a continuation of application No. 16/483,359, granted, now 11,492,897, previously published as PCT/NO2017/050032, filed on Feb. 3, 2017.
Prior Publication US 2022/0389811 A1, Dec. 8, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. E21B 47/11 (2012.01); E21B 43/14 (2006.01); G01F 1/7086 (2022.01); G01F 1/74 (2006.01); G01N 21/64 (2006.01)
CPC E21B 47/11 (2020.05) [E21B 43/14 (2013.01); G01F 1/7086 (2013.01); G01F 1/74 (2013.01); G01N 21/64 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method of multi-phase petroleum well flow characterisation comprising,
for at least two injection positions, along the well, the well having a local production flow of target fluids water and hydrocarbon fluids (oil and/or gas) at each position, whereof
at least one or more zonal positions are along the production zone; and
a) for at least two of the positions;
using locally arranged injection devices;
injecting in a synchronized manner, at least one set of at least a water-affine and a hydrocarbon-affine tracer;
the tracers being optically detectable;
injecting the at least one set of tracer into and/or through all phases in the local production flow simultaneously allowing local mixing of the phases;
b) allowing transport of the production flow from the downhole injection points to a detector in the production flow at a detection point downstream of all the injection points;
c) at the detection point, determining arrival times of the tracers;
d) characterizing the flow behaviour of the well based on the arrival times of the tracers.