US 12,227,997 B2
Downhole traction tool and method of use
Jean Boulet, Aberdeen (GB); and Siegfried Grabner, Aberdeen (GB)
Assigned to INNOVATIVE DRILLING SYSTEMS LTD, Aberdeen (GB)
Appl. No. 17/783,394
Filed by INNOVATIVE DRILLING SYSTEMS LIMITED, Aberdeen (GB)
PCT Filed Dec. 9, 2020, PCT No. PCT/GB2020/053148
§ 371(c)(1), (2) Date Jun. 8, 2022,
PCT Pub. No. WO2021/116675, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 1917970 (GB), filed on Dec. 9, 2019.
Prior Publication US 2023/0003089 A1, Jan. 5, 2023
Int. Cl. E21B 17/22 (2006.01); E21B 17/10 (2006.01)
CPC E21B 17/22 (2013.01) [E21B 17/1078 (2013.01)] 25 Claims
OG exemplary drawing
 
22. A method of moving a work string in a borehole comprising the steps of:
providing at least one downhole borehole traction apparatus comprising a body comprising a borehole engaging section, wherein the borehole engaging section comprises an outer surface configured to contact an inner surface of a borehole, wherein at least one thread is provided on the outer surface, and wherein the at least one thread comprises:
a crest surface;
a leading surface; and
a trailing surface having a curvilinear shape;
wherein the at least one thread has a low pressure generation means comprising one or more formations;
connecting the at least one downhole borehole traction apparatus to a work string;
rotating the work string to move the borehole engaging section such that the crest surface of the at least one thread engages the inner surface of the borehole to urge the apparatus along the inner surface of the borehole in response to rotation of the body and/or the apparatus.