US 11,905,826 B2
Clock calibration of remote systems by roundtrip time
Imran Sharif Vehra, Kingwood, TX (US); Zinovy B. Krugliak, Houston, TX (US); Randal T. Beste, Katy, TX (US); Matthew Chase Griffing, Kingwood, TX (US); Christopher A. Golla, Kingwood, TX (US); Wenhao Chen, Houston, TX (US); and Rameez Balagamwala, Houston, TX (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Appl. No. 16/346,416
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
PCT Filed May 31, 2018, PCT No. PCT/US2018/035459
§ 371(c)(1), (2) Date Apr. 30, 2019,
PCT Pub. No. WO2019/231458, PCT Pub. Date Dec. 5, 2019.
Prior Publication US 2021/0372273 A1, Dec. 2, 2021
Int. Cl. E21B 47/12 (2012.01); G01V 3/34 (2006.01); G01V 11/00 (2006.01); G01V 13/00 (2006.01)
CPC E21B 47/12 (2013.01) [G01V 3/34 (2013.01); G01V 11/002 (2013.01); G01V 13/00 (2013.01); G01V 2200/12 (2013.01)] 21 Claims
OG exemplary drawing
 
12. A well measurement system comprising:
a downhole tool, wherein the downhole tool comprises:
a first device;
a master module disposed on the first device, wherein the master module comprises a master transmitter and a master receiver;
a second device;
a module disposed on the second device, wherein the module comprises a transmitter and a receiver; and
an information handling system for:
transmitting a signal to the module,
changing the master module from a line driver controlled by the master transmitter to a line receiver controlled by the master receiver,
transmitting a return signal from the module to the master module
determining Tdd of a time for the signal to travel from the master module to the module, wherein the Tdd=(Counter-Tf-T4-T3)/2, wherein the Counter is a second time for the signal to travel from the master module to the module and back to the master module as measured by the master module, the T4 is a master module signal detection time, the Tf is a fixed time delay and the T3 is a module signal detection time,
determining T2, wherein the T2=T3+(Tdd-T1), wherein the T2 is a time delay and the T1 is a time it takes for the signal to be transmitted and detected at the master module,
receiving the return signal from the module with the master module, and
measuring a time for the signal to travel from the master module to the module and the return signal back to the master module.