Modified tubular equipped with a tilted or transverse magnetic dipole for downhole logging
AssigneeSchlumberger Technology Corporation
InventorsMark T. Frey, Dzevat Omeragic, Jacques R. Tabanou
Life of this patent
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Abstract
Method and system for subsurface logging utilizing a modified metallic tubular having an elongated body with tubular walls and a central bore adapted to receive a support member. The tubular including slotted stations to provide through-tubular signal transmission and/or reception. Pressure barrier means provide hydraulic isolation at the slotted stations. The support member is equipped with various sources and sensors, including an antenna adapted to generate a magnetic dipole moment with a transverse or controllable orientation, and adapted for engagement within the tubular. The apparatus is suitable for LWT, LWD, and TLC logging operations.
Claims50
An apparatus for determining a property of a subsurface formation, comprising:
- an elongated body with tubular walls and a central bore, the body including at least one slot formed therein such that the slot fully penetrates the tubular wall;
- a support having a longitudinal axis, said support disposed within said central bore;
- and
- at least one antenna disposed on the support, said antenna being adapted to generate a magnetic dipole moment with a transverse or controllable orientation;
- wherein said antenna is positioned near the at least one slot.
A method for determining a property of a subsurface formation, comprising:
- a) disposing an elongated body within a borehole traversing said formation, said body having tubular walls, a central bore, and including at least one slot formed therein such that the slot fully penetrates the tubular wall;
- b) disposing a support within the central bore of said body, said support having a longitudinal axis and at least one antenna disposed thereon, said antenna being adapted to generate a magnetic dipole moment with a transverse or controllable orientation;
- c) positioning said antenna near the at least one slot on said body;
- and
- d) transmitting or receiving a signal with said at least one antenna to determine said formation property.
A system for determining a property of a subsurface formation, comprising:
- a sub having an elongated body with tubular walls and a central bore, the sub being adapted to form a portion of a length of drill string;
- the sub having at least one slot formed therein such that the slot fully penetrates the tubular wall;
- a support member having at least one antenna disposed thereon, said antenna being adapted to generate a magnetic dipole moment with a transverse or controllable orientation;
- the support member being adapted for transit through the drill string and into the central bore of the sub;
- and
- means for receiving the support member within the sub.
Dependencies are inferred from the claim text.