US 11,905,821 B2
Offset well analysis using well trajectory similarity
Vladimir Zhernakov, Tyumen (RU); Xiaotong Suo, Stanford, CA (US); Jose Celaya Galvan, Menlo Park, CA (US); Velizar Vesselinov, Katy, TX (US); and Neil Holger White Eklund, Oakland, CA (US)
Assigned to Schlumberger Technology Corporation, Sugar Land, TX (US)
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
Filed on Aug. 15, 2019, as Appl. No. 16/541,148.
Prior Publication US 2021/0047914 A1, Feb. 18, 2021
Int. Cl. E21B 47/022 (2012.01); E21B 44/00 (2006.01); G01V 99/00 (2009.01); E21B 49/00 (2006.01); E21B 41/00 (2006.01)
CPC E21B 47/022 (2013.01) [E21B 44/00 (2013.01); G01V 99/005 (2013.01); E21B 41/0092 (2013.01); E21B 49/00 (2013.01)] 13 Claims
OG exemplary drawing
 
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.