US 11,725,474 B2
Automation of packer inflation
Bo Yang, Sugar Land, TX (US); Kai Hsu, Sugar Land, TX (US); and Deopaul Dindial, Dhahran (SA)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
Filed on Aug. 8, 2022, as Appl. No. 17/818,042.
Application 17/818,042 is a continuation of application No. 16/720,144, filed on Dec. 19, 2019, granted, now 11,408,244.
Claims priority of provisional application 62/900,993, filed on Sep. 16, 2019.
Prior Publication US 2022/0381098 A1, Dec. 1, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. E21B 33/127 (2006.01); G01L 19/06 (2006.01); E21B 47/06 (2012.01); E21B 33/12 (2006.01); E21B 23/06 (2006.01)
CPC E21B 33/127 (2013.01) [E21B 23/06 (2013.01); E21B 33/12 (2013.01); E21B 47/06 (2013.01); G01L 19/0618 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for setting an inflatable packer, the method comprising:
positioning an inflatable packer within a borehole;
pumping fluid into an inflatable element of the inflatable packer using a pump, wherein the pump is driven by a motor;
measuring pressure of the inflatable element;
determining a derivative of the measured pressure with respect to time, wherein the pressure of the inflatable element is measured over time, at fixed intervals, and wherein a buffer of L registers of measured pressure is maintained, wherein L is an integral that is equal to or greater than 2, wherein the pressure derivative, D, of the pressure measurements, x, is determined in accordance with the following equation: D=Σi=1i=Lx(i)f(i), and wherein f(i) is the Savitzky-Golay polynomial filter;
determining onset of restraining of the inflatable element has occurred when the derivative is equal to or greater than a derivative threshold; and
upon or after determining the onset of restraining, turning off the motor or slowing down an rpm of the motor.