Modular geosteering tool assembly
First Claim
1. An extension module that comprises:
- a threaded connector that mechanically couples to a resistivity logging tool having at least one transmitter antenna and at least one receiver antenna, and wherein the threaded connector establishes an electrical signal path with the resistivity logging tool when so coupled;
electronics that operate cooperatively with the resistivity logging tool to detect azimuthal variations in formation resistivity, wherein as part of said operating, the electronics apply one or more measurement parameters received via the electrical signal path from the resistivity logging tool; and
a tilted receiver antenna to make azimuthally-sensitive measurements in response to operation of said transmitter antenna, wherein the azimuthally-sensitive measurements comprise at least one of phase shift and attenuation between the tilted receiver antenna and a reference signal.
2 Assignments
0 Petitions
Accused Products
Abstract
A retrievable tool for steering through an earth formation includes a first tool assembly and a tilted antenna attached to the first tool assembly. The tool also includes a second tool assembly attached to the first tool assembly and a tilted antenna attached to the second tool assembly. The first tool assembly attaches to the second tool assembly so that the antennas are tilted in predetermined directions. The tilted antennas are transmitter antennas or receiver antennas. Each tool assembly is a tubular cylinder with a longitudinal axis running the length of the cylinder, wherein the tubular cylinder has two ends, each end including a rotational attachment mechanism. The tool assemblies attach to each other through their rotational attachment mechanisms. The rotational attachment mechanism may be a screw-on mechanism, press-fit mechanism, or welded mechanism.
186 Citations
7 Claims
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1. An extension module that comprises:
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a threaded connector that mechanically couples to a resistivity logging tool having at least one transmitter antenna and at least one receiver antenna, and wherein the threaded connector establishes an electrical signal path with the resistivity logging tool when so coupled; electronics that operate cooperatively with the resistivity logging tool to detect azimuthal variations in formation resistivity, wherein as part of said operating, the electronics apply one or more measurement parameters received via the electrical signal path from the resistivity logging tool; and a tilted receiver antenna to make azimuthally-sensitive measurements in response to operation of said transmitter antenna, wherein the azimuthally-sensitive measurements comprise at least one of phase shift and attenuation between the tilted receiver antenna and a reference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification