US 12,065,925 B2
Methods for determining a position of a droppable object in a wellbore
Demid Valeryevich Demidov, Novosibirsk (RU); Artem Valeryevich Kabannik, Novosibirsk (RU); and Roman Vladimirovich Korkin, Novosibirsk (RU)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
Filed on Aug. 25, 2020, as Appl. No. 17/002,130.
Claims priority of application No. PCT/RU2019/000600 (WO), filed on Aug. 28, 2019.
Prior Publication US 2021/0062640 A1, Mar. 4, 2021
Int. Cl. E21B 47/095 (2012.01); E21B 33/16 (2006.01); E21B 23/04 (2006.01)
CPC E21B 47/095 (2020.05) [E21B 33/165 (2020.05); E21B 23/04 (2013.01)] 17 Claims
OG exemplary drawing
 
9. A method for cementing a borehole penetrating subterranean formation, comprising:
(i) installing a casing string into the borehole wherein the casing string comprises pipe joints;
(ii) installing a pressure data acquisition system at a wellsite and at least one pressure transducer at a wellhead;
(iii) placing a top cementing plug inside the casing string;
(iv) pumping a displacement fluid behind the top cementing plug causing the top cementing plug to travel through the casing string and pass through the pipe joints generating a pressure pulse due to a difference in the diameter of pipe joints from casing string diameter, wherein the generated pressure pulse generates recordable pressure data;
(v) using the pressure transducer to detect the pressure pulse and transmit pressure data to the pressure data acquisition system, the pressure data comprising pressure pulse propagation velocity and reflection time; and
(vi) determining the position of the top cementing plug and processing the pressure data mathematically using cepstral analysis.