US 11,708,749 B2
Downhole device with signal transmitter
Erling Kleppa, Jørpeland (NO)
Assigned to Petroleum Technology Company AS, Stavanger (NO)
Appl. No. 16/754,735
Filed by PETROLEUM TECHNOLOGY COMPANY AS, Stavanger (NO)
PCT Filed Oct. 9, 2018, PCT No. PCT/NO2018/050241
§ 371(c)(1), (2) Date Apr. 8, 2020,
PCT Pub. No. WO2019/074374, PCT Pub. Date Apr. 18, 2019.
Claims priority of application No. 20171613 (NO), filed on Oct. 10, 2017.
Prior Publication US 2020/0308941 A1, Oct. 1, 2020
Int. Cl. E21B 43/12 (2006.01); E21B 47/135 (2012.01); E21B 34/06 (2006.01); E21B 47/14 (2006.01); E21B 47/06 (2012.01); G01H 9/00 (2006.01); G01V 11/00 (2006.01)
CPC E21B 43/123 (2013.01) [E21B 34/06 (2013.01); E21B 47/135 (2020.05); E21B 47/14 (2013.01); G01H 9/004 (2013.01); E21B 47/06 (2013.01); G01V 11/002 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A wellbore installation comprising:
a plurality of downhole devices installed in a petroleum well, the plurality of downhole devices including a first downhole device and a second downhole device;
a fiber optic cable in the petroleum well; and
a topside controller,
wherein each of the first and second downhole devices comprises:
a sensor,
a controller,
a power source, and
an acoustic speaker configured to output a sound signal to the fiber optic cable,
wherein the fiber optic cable functions as both a distributed temperature sensing (DTS) line and a distributed audio sensing (DAS) line,
wherein the topside controller is configured to receive the sound signal,
wherein the sound signal from each of the first and second downhole devices includes an identifiable signature,
wherein the top controller is configured to distinguish whether the sound signal is from the first downhole device or the second downhole device based on the identifiable signature, and
wherein the identifiable signature comprises a sound signal that is transmitted in a unique sequence, wherein the unique sequence of the sound signal of the first downhole device is different from the unique sequence of the sound signal of the second downhole device, wherein the unique sequence of the sound signal of the first downhole device comprises the sound signal being transmitted and maintained for a first amount of time, and the unique sequence of the sound signal of the second downhole device comprises the sound signal being transmitted and maintained for a second amount of time that is different from the first amount of time,
wherein the topside controller is configured to transmit a first pressure sequence to activate the first downhole device, wherein the first pressure sequence comprises an annulus pressure being reduced and maintained for a third amount of time;
wherein the first downhole device is configured to:
responsive to receiving the first pressure sequence, transitioning to a listening mode; and
transmitting, by the acoustic speaker, a predetermined sound signal to the topside controller, wherein the predetermined sound signal indicates that the first downhole device is in the listening mode.