# US 2014/0156211 A1 · Tilted Test Loop Calibration System > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0156211 A1 - Document ID: US20140156211A1 - Status: Published application - Kind: A1 - Application number: 13/691,012 - Filed: 2012-11-30 - Published: 2014-06-05 - Earliest claimed: 2012-11-30 - Assignees: Schlumberger Technology Corporation - Applicants: Schlumberger Technology Corporation - Inventors: Dursun Sedat Kilic - Web page: https://patentgrep.com/patent/US20140156211A1 ## CPC - G01V 13/00: Manufacturing, calibrating, cleaning, or repairing instruments or devices covered by groups G01V1/00 – G01V11/00 - G01V 3/28: using induction coils - G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02) ## Abstract A tilted test loop for use in calibrating an electromagnetic logging tool includes a substantially cylindrical hub, a planar elliptical frame connected to the hub and oriented at a tilt angle with respect to a longitudinal axis of the hub, at least one triangular wedge connected to the hub and the planar frame, the triangular wedge having an angle that defines the tilt angle, and a plurality of elliptical conductive loops deployed in corresponding elliptical grooves in the frame. ## Claims ### Claim 1 A tilted test loop for use in calibrating an electromagnetic logging tool, the tilted test loop comprising: a substantially cylindrical hub having a longitudinal axis and a through bore sized and shaped for deployment about the electromagnetic logging tool; a planar elliptical frame connected to the hub and oriented at a tilt angle with respect to the longitudinal axis of the hub; at least one triangular wedge connected to the hub and the planar frame, the triangular wedge having an angle that defines the tilt angle; and a plurality of elliptical conductive loops deployed in corresponding elliptical grooves in the frame. ### Claim 2 (depends on 1) The tilted test loop of claim 1, further comprising first and second substantially identical triangular wedges deployed on opposing sides of the frame. ### Claim 3 (depends on 1) The tilted test loop of claim 1, wherein the triangular wedge comprises a hypotenuse that is connected to the frame and a leg that is connected to the hub. ### Claim 4 (depends on 3) The tilted test loop of claim 3, wherein the leg engages a dovetail groove in the hub. ### Claim 5 (depends on 3) The tilted test loop of claim 3, wherein the angle that defines the tilt angle is an angle between the hypotenuse and the leg of the triangular wedge. ### Claim 6 (depends on 1) The tilted test loop of claim 1, wherein the tilt angle has an angular tolerance of less than or equal to ±0.1 degrees. ### Claim 7 (depends on 1) The tilted test loop of claim 1, wherein each of the plurality of conductive loops includes a corresponding switch configured to selectively open and close the conductive loop. ### Claim 8 (depends on 1) The tilted test loop of claim 1, wherein the frame comprises (i) a central disk, (ii) a plurality of elliptical rings, and (iii) a plurality of radial supports that connect the elliptical rings to the central disk. ### Claim 9 (depends on 7) The tilted test loop of claim 7, wherein: a first of the plurality of conductive loops is deployed in an elliptical groove in the disk; and a second of the plurality of conductive loops is deployed in an elliptical groove in one of the plurality of elliptical rings. ### Claim 10 (depends on 8) The tilted test loop of claim 8, wherein a third of the plurality of conductive loops is deployed in an elliptical groove in a second of the plurality of elliptical rings. ### Claim 11 A system for calibrating an electromagnetic logging tool, the system comprising: an electromagnetic logging tool having a tool body, a plurality of transmitter antennae, and a plurality of receiver antennae; a tilted test loop deployed on the electromagnetic logging tool, the tilted test loop including (i) a substantially cylindrical hub deployed about the electromagnetic logging tool, (ii) a planar elliptical frame connected to the hub and oriented at a tilt angle with respect to a longitudinal axis of the hub, (iii) at least one triangular wedge connected to the hub and the planar frame, the triangular wedge having an angle that defines the tilt angle, and (iv) a plurality of elliptical conductive loops deployed in corresponding elliptical grooves in the frame; and a processor including instructions to (a) cause one of the transmitter antennae to transmit an electromagnetic wave, (b) cause one of the receiver antennae to receive the transmitted electromagnetic wave, and (c) process the received electromagnetic wave to compute a calibration of the electromagnetic logging tool. ### Claim 12 (depends on 11) The system of claim 11, wherein the tilted test loop further comprises first and second substantially identical triangular wedges deployed on opposing sides of the frame. ### Claim 13 (depends on 1) The system of claim 1, wherein the triangular wedge comprises a hypotenuse that is connected to the frame and a leg that is connected to the hub via engagement with a dovetail groove. ### Claim 14 (depends on 13) The system of claim 13, wherein the angle that defines the tilt angle is an angle between the hypotenuse and the leg of the triangular wedge. ### Claim 15 (depends on 11) The system of claim 11, wherein the tilt angle has an angular tolerance of less than or equal to ±0.1 degrees. ### Claim 16 (depends on 11) The system of claim 11, wherein each of the plurality of conductive loops includes a corresponding switch configured to selectively open and close the conductive loop. ### Claim 17 (depends on 11) The system of claim 11, wherein: the frame comprises (i) a central disk, (ii) a plurality of elliptical rings, and (iii) a plurality of radial supports that connect the elliptical rings to the central disk. a first of the plurality of conductive loops is deployed in an elliptical groove in the disk; a second of the plurality of conductive loops is deployed in an elliptical groove in one of the plurality of elliptical rings; and a third of the plurality of conductive loops is deployed in an elliptical groove in a second of the plurality of elliptical rings. ### Claim 18 A method for calibrating an electromagnetic logging tool, the method comprising: (a) deploying a tilted test loop about the electromagnetic logging tool, the tilted test loop including (i) a substantially cylindrical hub deployed about the electromagnetic logging tool, (ii) a planar elliptical frame connected to the hub and oriented at a tilt angle with respect to a longitudinal axis of the hub, (iii) at least one triangular wedge connected to the hub and the planar frame, the triangular wedge having an angle that defines the tilt angle, and (iv) a plurality of elliptical conductive loops deployed in corresponding elliptical grooves in the frame; (b) configuring the tilted test loop such that a single one of the plurality of conductive loops is closed and all others of the plurality of conductive loops are open; (c) causing a transmitter antenna on the electromagnetic logging tool to transmit an electromagnetic wave; (d) causing a receiver antenna on the electromagnetic logging tool to receive the electromagnetic wave transmitted in (c); and (e) causing a processor to compute a calibration for the electromagnetic logging tool from the electromagnetic wave received in (d). ### Claim 19 (depends on 18) The method of claim 18, further comprising: (f) repositioning the tilted test loop on the electromagnetic logging tool; and (g) repeating (b), (c), (d), and (e) to compute another calibration for the electromagnetic logging tool. ### Claim 20 (depends on 18) The method of claim 18, further comprising: (f) reconfiguring the tilted test loop such that another single one of the plurality of conductive loops is closed and all others of the plurality of conductive loops are open; and (g) repeating (c), (d), and (e) to compute another calibration for the electromagnetic logging tool.