US 11,655,707 B2
Systems and methods to utilize sensors to provide spatial resolution in downhole leak detection
Yi Yang Ang, Singapore (SG); Nam Nguyen, Singapore (SG); Joni Polili Lie, Singapore (SG); and Yinghui Lu, The Woodlands, TX (US)
Assigned to HALLIBURTON ENERGY SERVICES, INC., Houston, TX (US)
Appl. No. 16/645,093
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
PCT Filed Dec. 29, 2017, PCT No. PCT/US2017/068930
§ 371(c)(1), (2) Date Mar. 6, 2020,
PCT Pub. No. WO2019/132975, PCT Pub. Date Jul. 4, 2019.
Prior Publication US 2020/0292728 A1, Sep. 17, 2020
Int. Cl. G01V 11/00 (2006.01); E21B 47/107 (2012.01); E21B 47/117 (2012.01); E21B 47/113 (2012.01); E21B 47/12 (2012.01)
CPC G01V 11/002 (2013.01) [E21B 47/107 (2020.05); E21B 47/113 (2020.05); E21B 47/117 (2020.05); E21B 47/12 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of downhole leak detection, comprising:
positioning a physical sensor in a wellbore;
wherein the physical sensor consists of only a hydrophone, electromagnetic sensor, or chemical sensor;
moving the physical sensor along the wellbore;
recording a plurality of samples of physical signals detected by the physical sensor while moving the physical sensor along the wellbore;
identifying frames of correlated sequences observed in the plurality of samples provided by the physical sensor;
performing a coherent sequence extraction operation on the physical signals of the physical sensor to obtain a plurality of virtual signals associated with an array of virtual sensors;
constructing a covariance matrix based on the correlated sequences and the plurality of virtual signals;
computing a spatial spectrum that indicates a location of a leak in the wellbore based on the covariance matrix; and
utilizing a beamforming technique to determine a localized peak of the spatial spectrum, wherein the localized peak is indicative of the location of the leak.