# US 2021/0277764 A1 · Apparatus and methods for making azimuthal resistivity measurements > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0277764 A1 - Document ID: US20210277764A1 - Status: Published application - Kind: A1 - Application number: 17/322,165 - Filed: 2021-05-17 - Published: 2021-09-09 - Earliest claimed: 2013-06-12 - Assignees: Well Resolutions Technology - Applicants: Well Resolutions Technology - Inventors: Tsili Wang - Web page: https://patentgrep.com/patent/US20210277764A1 ## CPC - E21B 44/005: {Below-ground automatic control systems} - E21B 7/062: {the tool shaft rotating inside a non-rotating guide travelling with the shaft (E21B7/067 and E21B7/068 take precedence)} - E21B 47/024: of devices in the borehole (determining slope or direction of the borehole E21B47/022) - E21B 47/09: Locating or determining the position of objects in boreholes or wells {, e.g. the position of an extending arm}; Identifying the free or blocked portions of pipes - E21B 49/00: Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells - G01V 3/12: operating with electromagnetic waves {(operating with millimetre waves G01V8/005)} - G01V 3/26: operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device (with electromagnetic waves G01V3/30) - G01V 3/28: using induction coils - G01V 3/30: operating with electromagnetic waves - G01V 3/34: Transmitting data to recording or processing apparatus; Recording data - G06F 16/24554: {Unary operations; Data partitioning operations} - G06F 16/24578: {using ranking} - E21B 17/1078: {Stabilisers or centralisers for casing, tubing or drill pipes (E21B17/1007 - E21B17/1064 take precedence)} - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS - G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A resistivity measuring tool used in a drillstring having a drill bit on a distal end for drilling a wellbore in a formation includes a tool body having a longitudinal axis, a transmitting antenna, and a receiving antenna. The receiving antenna includes an antenna body having a longer axis disposed longitudinally in the tool body, and a wire coil having a central axis disposed around the antenna body, wherein the wire coil central axis is substantially perpendicular to the longer axis of the antenna body, and wherein the wire coil is configured to generate a magnetic moment orthogonal to the tool body longitudinal axis. The transmitting antenna is configured to transmit electromagnetic energy into the formation and induce a voltage signal related to a parameter of the formation in the receiving antenna. ## Claims ### Claim 1 A tool comprising: a tool body; a receiving antenna configured to be disposed within a pocket of a tool body wherein the receiving antenna comprises: an antenna body having a longer axis configured to be disposed longitudinally in the tool body; and a wire coil configured to generate a magnetic moment wherein the wire coil has a central axis disposed around the antenna body and wherein the wire coil central axis is angled with respect to the longer axis of the antenna body, wherein the receiving antenna is configured to receive a voltage signal related to a parameter of a geologic formation. ### Claim 2 (depends on 1) The tool of claim 1, wherein the receiving antenna is disposed within a pocket extending radially inward from an outer surface of the tool body. ### Claim 3 (depends on 2) The tool of claim 2, further comprising a non-conducting material disposed within the pocket beneath and around the wire winding. ### Claim 4 (depends on 2) The tool of claim 2, further comprising a magnetic material disposed within the pocket beneath and around the wire winding. ### Claim 5 (depends on 2) The tool of claim 2, wherein the pocket extends radially inward from the outer surface a maximum of approximately one inch. ### Claim 6 (depends on 2) The tool of claim 2, wherein the pocket extends axially a maximum of approximately ten inches. ### Claim 7 (depends on 2) The tool of claim 2, further comprising an antenna shield having openings therein covering the antenna body and wire winding within the pocket and attached to the tool body. ### Claim 8 (depends on 7) The tool of claim 7, wherein the openings in the antenna shield are curved. ### Claim 9 (depends on 1) The tool of claim 1, further comprising multiple receiving antennas proximate to the outer surface of the tool body and azimuthally-spaced around a circumference of the tool body. ### Claim 10 (depends on 9) The tool of claim 9, wherein the multiple receiving antennas are azimuthally-spaced at or less than 180 degrees apart. ### Claim 11 (depends on 9) The tool of claim 9, wherein the multiple receiving antennas are connected in series or parallel. ### Claim 12 (depends on 1) The tool of claim 1, further comprising a transmitting antenna. ### Claim 13 (depends on 13) The tool of claim 13, wherein the transmitting antenna comprises a wire winding that is symmetric about the longitudinal axis of the tool body. ### Claim 14 (depends on 1) The tool of claim 1, further comprising a sensor configured to measure the angular position of the tool body relative to the wellbore. ### Claim 15 (depends on 1) The tool of claim 1, further comprising a transmitting antenna configured to induce the voltage signal related to a parameter of the geologic formation that is received by the receiving antenna.