US 11,939,830 B2
Tool, system and method for orienting core samples during borehole drilling
Orlando Rene Ramírez Ozuna, Malaga (ES)
Assigned to STOCKHOLM PRECISION TOOLS, S.L., Malaga (ES)
Appl. No. 17/802,769
Filed by STOCKHOLM PRECISION TOOLS, S.L., Malaga (ES)
PCT Filed Mar. 1, 2021, PCT No. PCT/ES2021/070147
§ 371(c)(1), (2) Date Aug. 26, 2022,
PCT Pub. No. WO2021/170896, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. ES202030169 (ES), filed on Feb. 28, 2020.
Prior Publication US 2023/0082354 A1, Mar. 16, 2023
Int. Cl. E21B 25/16 (2006.01); E21B 47/024 (2006.01)
CPC E21B 25/16 (2013.01) [E21B 47/024 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A tool for orienting core samples extracted during borehole drilling, intended to be coupled to a core barrel or to a cable of a head assembly of a drill pipe, the tool comprising:
an electronic processor provided with at least one communication means connected to a processing unit, and
a set of triaxial accelerometers orthogonally coupled to each other in data communication with the electronic processor, the set of triaxial accelerometers configured to record data on an instantaneous movement or on an instantaneous vibration of the tool and transmit the data to the processing unit;
wherein a set of micromechanical gyroscopes orthogonally coupled to each other, in data communication with the processing unit, the set of micromechanical gyroscopes configured to rotate relative to an axis of rotation of the tool and record an instantaneous orientation of the tool and transmit the instantaneous orientation to the processing unit;
wherein the processing unit is configured to, from the data of the set of triaxial accelerometers and the set of micromechanical gyroscopes, calculate a orientation of at least one of the core samples with respect to absolute true north and a continuous trajectory of a drilled borehole;
wherein the set of micromechanical gyroscopes and the set of triaxial accelerometers are arranged on a rotating platform, the axis of rotation of the rotating platform is intended to coincide with an axis of rotation of the tool or of the drill pipe, the axis of rotation of the rotating platform being orthogonal to at least two measurement axes of the set of micromechanical gyroscopes; and
wherein the rotating platform can be controlled to be rotated by the processing unit for rotation at discrete angles of 180 degrees so that based on the rotation of the set of gyroscopes by the rotation of the rotating platform, the processing unit is configured to calculate a random start drift from a zero signal, evaluate and partially compensate for a temperature drift during execution of a measurement cycle.