US 11,713,670 B2
Casing collar locator for drill pipe
Abdul Halim Ab. Hamid, Udhailyah (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Sep. 30, 2021, as Appl. No. 17/491,135.
Prior Publication US 2023/0102387 A1, Mar. 30, 2023
Int. Cl. E21B 34/06 (2006.01); E21B 47/04 (2012.01); E21B 47/09 (2012.01); E21B 34/14 (2006.01); G01V 3/26 (2006.01)
CPC E21B 47/09 (2013.01) [E21B 34/066 (2013.01); E21B 34/14 (2013.01); E21B 47/04 (2013.01); G01V 3/26 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for locating a casing collar, said system comprising:
a drill pipe sub-assembly which includes a drill pipe segment and a detection apparatus disposed at a portion of the drill pipe segment, the drill pipe segment comprising a wall and an interior portion defined within the wall;
said detection apparatus comprising:
a bypass port disposed in the wall and in fluid communication with the interior portion;
an annular sleeve which directs fluid through the bypass port and into the interior portion;
an actuator which opens and closes the bypass port; and
two magnetized coils which interact to generate an electromagnetic field;
wherein the actuator closes the bypass port in response to a predetermined voltage generated by the magnetized coils when the coils displace past a casing collar;
a weight loss detection device which detects a loss of weight in the drill pipe segment after closing of the bypass port; and
a depth determination device which determines a depth of the casing collar, based on the detected loss of weight.