Patent · US Expired

Apparatus and method for resistivity measurements during rotational drilling

US7250768B2 · kind B2 · utility

38Cited by

10References

24Claims

0Family size

Assignee

Baker Hughes Holdings LLC · US

Inventors

Rene Ritter · Celle, DE
Matthias Gorek · Hannover, DE
Volker Krueger · Celle, DE
Martin Evans · Norwich, GB

Key dates

Filing date	Sep 9, 2003
Grant date	Jul 31, 2007
Priority date	—
Expiry date	Mar 19, 2024

Classification

Technology area (CPC G)Physics
CPC primaryG01V3/30
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A resistivity sub including a resistivity sensor forms part of a bottom hole drilling assembly. The sensor is maintained at a substantially fixed offset from the wall of a borehole during drilling operations by, for example, a stabilizer. In WBM, galvanic sensors may be used, with or without commonly used focusing methods, for obtaining a resistivity image of the borehole wall. In OBM, capacitive coupling may be used. The apparatus is capable of using other types of sensors, such as induction, MPR, shielded dipole, quadrupole, and GPR sensors.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.