# US 11,905,821 B2 · Offset well analysis using well trajectory similarity > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,905,821 B2 - Document ID: US11905821B2 - Status: Granted - Kind: B2 - Application number: 16/541,148 - Filed: 2019-08-15 - Published: 2021-02-18 - Granted: 2024-02-20 - Earliest claimed: 2019-08-15 - Assignees: Schlumberger Technology Corporation - Applicants: Schlumberger Technology Corporation - Inventors: Vladimir Zhernakov; Xiaotong Suo; Jose Celaya Galvan; Velizar Vesselinov; Neil Holger White Eklund - Web page: https://patentgrep.com/patent/US11905821B2 ## CPC - E21B 47/022: of the borehole, e.g. using geomagnetism - E21B 44/00: Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions - G01V 20/00: Geomodelling in general - E21B 41/00: Equipment or details not covered by groups E21B15/00 - E21B40/00 - 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 - 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) ## Abstract A method for offset well analysis includes receiving offset well data collected from an offset well, the offset well data including data representing a trajectory of an offset well, receiving subject well data comprising a trajectory of at least a portion of a subject well, partitioning the trajectory of the offset well into a plurality of offset well segments, partitioning the trajectory of the subject well into a plurality of subject well segments, determining a distance between at least some of the plurality of offset well segments and at least some of the plurality of subject well segments, selecting the offset well based in part on the distance, and performing an offset well analysis using the offset well and the subject well. ## Claims ### Claim 1 A method for offset well analysis, comprising: receiving offset well data collected from a plurality of existing offset wells, wherein the offset well data comprises experiential data regarding past events on the plurality of existing offset wells, and wherein the offset well data comprises data representing a trajectory of each existing offset well of the plurality of existing offset wells; receiving subject well data comprising a trajectory of at least a portion of a potential subject well; partitioning the trajectory of each existing offset well of the plurality of existing offset wells into a plurality of offset well segments; partitioning the trajectory of the potential subject well into a plurality of subject well segments; determining a distance between at least some of the plurality of offset well segments of each existing offset well of the plurality of existing offset wells and at least some of the plurality of subject well segments, wherein a surface location of a top of each existing offset well of the plurality of existing offset wells and a surface location of a top of the potential subject well are considered to be the same, wherein determining the distance comprises determining a plurality of distances between corresponding segments of the plurality of offset well segments and the plurality of subject well segments, wherein determining the distance comprises combining the plurality of distances, and wherein the distance comprises one of: a total of the plurality of distances, an average of the plurality of distances, or a weighted average of the plurality of distances; selecting an existing offset well from among the plurality of existing offset wells based in part on the distance; performing an offset well analysis using the existing offset well and the potential subject well; and adjusting the trajectory of the potential subject well, or one or more drilling parameters for the potential subject well, or both based at least in part on the offset well analysis. ### Claim 2 (depends on 1) The method of claim 1, wherein determining the distance comprises calculating a Euclidean distance between an inclination and an azimuth turn rate of one of the plurality of subject well segments and one of the plurality of offset well segments. ### Claim 3 (depends on 1) The method of claim 1, wherein determining the distance comprises calculating a modified Hausdorff distance between a first segment of the plurality of subject well segments and a second segment of the plurality of offset well segments, the first and second segments having corresponding depths. ### Claim 4 (depends on 1) The method of claim 1, further comprising determining a depth interval of interest, wherein the at least some of the plurality of subject well segments and the at least some of the plurality of offset well segments are defined in the depth interval of interest. ### Claim 5 (depends on 1) The method of claim 1, further comprising: receiving a set of rules defining a similarity between the existing offset well and the potential subject well, wherein determining the distance comprises applying the set of rules to the existing offset well and the potential subject well to quantify the similarity therebetween. ### Claim 6 A computing system, comprising: one or more processors; and a memory system comprising one or more non-transitory computer-readable media storing instructions that, when executed by at least one of the one or more processors, cause the computing system to perform operations, the operations comprising: receiving offset well data collected from a plurality of existing offset wells, wherein the offset well data comprises experiential data regarding past events on the plurality of existing offset wells, and wherein the offset well data comprises data representing a trajectory of each existing offset well of the plurality of existing offset wells; receiving subject well data comprising a trajectory of at least a portion of a potential subject well; partitioning the trajectory of each existing offset well of the plurality of existing offset wells into a plurality of offset well segments; partitioning the trajectory of the potential subject well into a plurality of subject well segments; determining a distance between at least some of the plurality of offset well segments of each existing offset well of the plurality of existing offset wells and at least some of the plurality of subject well segments, wherein a starting surface location of each existing offset well of the plurality of existing offset wells and a starting surface location of the potential subject well are considered to be the same, wherein determining the distance comprises determining a plurality of distances between corresponding segments of the plurality of offset well segments and the plurality of subject well segments, wherein determining the distance comprises combining the plurality of distances, and wherein the distance comprises one of: a total of the plurality of distances, an average of the plurality of distances, or a weighted average of the plurality of distances; selecting an existing offset well from among the plurality of existing offset wells based in part on the distance; performing an offset well analysis using the existing offset well and the potential subject well; and adjusting the trajectory of the potential subject well, or one or more drilling parameters for the potential subject well, or both based at least in part on the offset well analysis. ### Claim 7 (depends on 6) The computing system of claim 6, wherein determining the distance comprises determining the distance between corresponding segments of the plurality of offset well segments and the plurality of subject well segments, and wherein a surface location of the offset well and the potential subject well are considered to be the same. ### Claim 8 (depends on 6) The computing system of claim 6, wherein the operations further comprise determining a depth interval of interest, wherein the at least some of the plurality of subject well segments and the at least some of the plurality of offset well segments are defined in the depth interval of interest. ### Claim 9 (depends on 6) The computing system of claim 6, wherein the operations further comprise: receiving a set of rules defining a similarity between the existing offset well and the potential subject well, wherein determining the distance comprises applying the set of rules to the existing offset well and the potential subject well to quantify the similarity therebetween. ### Claim 10 (depends on 6) The computing system of claim 6, further comprising displaying a visualization of the existing offset well and the potential subject well representing the distance therebetween. ### Claim 11 (depends on 10) The computing system of claim 10, wherein the operations further comprise: determining a set of potentially relevant offset wells based on the distance; and selecting one or more of the set of the potentially relevant offset wells based on the visualization, wherein selecting the offset well comprises selecting from the one or more of the potentially relevant wells. ### Claim 12 A non-transitory computer-readable medium storing instructions that, when executed by one or more processors of a computing system, cause the computing system to perform operations, the operations comprising: receiving offset well data collected from a plurality of existing offset wells, wherein the offset well data comprises experiential data regarding past events on the plurality of existing offset wells, and wherein the offset well data comprises data representing a trajectory of each existing offset well of the plurality of existing offset wells; receiving subject well data comprising a trajectory of at least a portion of a potential subject well; partitioning the trajectory of each existing offset well of the plurality of existing offset wells into a plurality of offset well segments; partitioning the trajectory of the potential subject well into a plurality of subject well segments; determining a distance between at least some of the plurality of offset well segments of each existing offset well of the plurality of existing offset wells and at least some of the plurality of subject well segments, wherein determining the distance comprises determining the distance between corresponding segments of the plurality of offset well segments and the plurality of subject well segments, and wherein a surface location of a top of each existing offset well of the plurality of existing offset wells and a location of a top of the potential subject well are considered to be the same for purposes of determining the distance, the distance representing a similarity of the trajectory of the at least some of the plurality of offset well segments of each existing offset well of the plurality of existing offset wells and the trajectory of the at least some of the plurality of subject well segments of the potential subject well, wherein determining the distance comprises determining a plurality of distances between corresponding segments of the plurality of offset well segments and the plurality of subject well segments, wherein determining the distance comprises combining the plurality of distances, and wherein the distance comprises one of: a total of the plurality of distances, an average of the plurality of distances, or a weighted average of the plurality of distances; selecting an existing offset well from among the plurality of existing offset wells based in part on the distance; performing an offset well analysis using the existing offset well and the potential subject well; and adjusting the trajectory of the potential subject well, or one or more drilling parameters for the potential subject well, or both based at least in part on the offset well analysis. ### Claim 13 (depends on 12) The non-transitory, computer-readable medium of claim 12, wherein determining the distance comprises calculating a modified Hausdorff distance between a first segment of the plurality of subject well segments and a second segment of the plurality of offset well segments, the first and second segments having corresponding depths.