Patent ID: 11879328
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 13:
14. A method for collecting data at a fixed point in a wellbore, comprising:
attaching a ballast in a recess of an untethered measurement tool (UMT) via a first magnet;
dropping the UMT in the wellbore, wherein recessing the ballast facilitates controlling a drag on the UMT during descent and blocks attachment of the first magnet to a wall of the wellbore;
switching the first magnet to drop the ballast from the UMT at a ballast drop condition;
switching a second magnet separate from and perpendicular to the first magnet to attach the UMT to the wall of the wellbore at a wall attachment condition;
collecting data in the UMT while the UMT is attached to the wall of the wellbore;
switching the second magnet to release the UMT from the wall of the wellbore at a wall release condition;
collecting the UMT from the wellbore; and
downloading the data from the UMT.