HYDRAULICALLY DRIVEN SELF-PROPELLING WIRELINE TOOL STRING

    公开(公告)号:EP4163468A1

    公开(公告)日:2023-04-12

    申请号:EP21202037.4

    申请日:2021-10-11

    申请人: Welltec A/S

    IPC分类号: E21B4/18 E21B23/14 E21B23/00

    摘要: A downhole self-propelling wireline tool string to be used in wellbores, comprising, a first tool body (3a), a first electric motor (4), a first electric control unit (18), one first drive section (30a), comprising, a plurality of wheels (8), a first hydraulic pump (12) driven by the electric motor for generation of a second fluid pressure for driving the hydraulic motor(s) rotating the wheel(s), and wherein the downhole self-propelling wireline tool string further comprises a second downhole self-propelling wireline tool (lb), having similar construction as the first sel-propelling tool, wherein each electric motor of the first and second tools comprises a power-limiting unit (31) in order to distribute a first part of the current from the wireline to power the first electric motor and a second part of the current to power the second electric motor.