US 12,000,266 B2
Method and apparatus for measuring a wellbore
Christopher S. Thompson, Calgary (CA); David A. Switzer, Conroe, TX (US); Rodney M. Wingerter, Conroe, TX (US); and Jawad A. Alsadah, Conroe, TX (US)
Assigned to GEONOMIC TECHNOLOGIES INC., Calgary (CA)
Filed by GEONOMIC TECHNOLOGIES INC., Calgary (CA)
Filed on Sep. 12, 2022, as Appl. No. 17/942,337.
Application 17/942,337 is a continuation of application No. PCT/CA2021/050337, filed on Mar. 12, 2021.
Claims priority of provisional application 62/989,420, filed on Mar. 13, 2020.
Prior Publication US 2023/0008095 A1, Jan. 12, 2023
Int. Cl. E21B 47/08 (2012.01)
CPC E21B 47/08 (2013.01) 20 Claims
OG exemplary drawing
 
1. An apparatus for measuring the profile of a wellbore, the apparatus comprising:
a cylindrical body having first and second ends threaded for connection in line with a drill string and having a passage extending through the cylindrical body between the first end and the second end thereof;
a plurality of arms pivotally coupled to the cylindrical body, each of the arms biased to pivot so as to move a free end thereof radially away from an outer surface of the cylindrical body, the plurality of arms being angularly spaced apart around the cylindrical body and arranged in a plurality of tiers, each of the tiers comprising three or more of the arms, the tiers being spaced apart axially from one another along the cylindrical body, and each said arm of a first said tier being angularly offset relative to the arms of a second said tier;
sensors operable to directly or indirectly measure radial extension of each of the arms from the cylindrical body; and
a holding mechanism operable to hold the arms in a retracted configuration and to selectively release the arms to pivot away from the cylindrical body, wherein the holding mechanism comprises one or more of i) a hydraulic actuator, ii) an electric actuator, iii) a magnetic system, and iv) a pneumatic actuator.