Integrated electrode resistivity and EM telemetry tool
First Claim
1. An integrated resistivity and telemetry tool for use in a wellbore, comprising:
- a conductive tubular including first portion and a second portion separated by an insulated gap;
an electronics cartridge carrying telemetry circuitry disposed in the first portion;
a measure electrode carried on the second portion;
resistivity measurement circuitry disposed on the second portion and functionally connected to the measure electrode;
an inductive coupler disposed on the first portion and electrically and functionally connecting the electronics cartridge to the resistivity measurement circuitry; and
wherein the resistivity measurement circuitry maintains the measure electrode at substantially the same potential as the second portion.
1 Assignment
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Accused Products
Abstract
An integrated electrode resistivity and EM telemetry tool and obtaining both formation resistivity and telemetry data from the integrated tool. An integrated electrode resistivity and EM telemetry tool having a drill collar including a first portion and a second portion separated by an insulated gap and telemetry cartridge carrying telemetry circuitry including a voltage source generating a voltage drop across the insulated gap and an axial current on a drill string that returns through an earthen formation includes an insulated measure electrode connected to the first portion, and resistivity measurement circuitry functionally connected to the measure electrode and the telemetry circuitry.
45 Citations
26 Claims
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1. An integrated resistivity and telemetry tool for use in a wellbore, comprising:
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a conductive tubular including first portion and a second portion separated by an insulated gap; an electronics cartridge carrying telemetry circuitry disposed in the first portion; a measure electrode carried on the second portion; resistivity measurement circuitry disposed on the second portion and functionally connected to the measure electrode; an inductive coupler disposed on the first portion and electrically and functionally connecting the electronics cartridge to the resistivity measurement circuitry; and wherein the resistivity measurement circuitry maintains the measure electrode at substantially the same potential as the second portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method to obtain a formation resistivity measurement using a telemetry tool disposed in a wellbore, the telemetry tool including conductive tubular having a first portion and a second portion separated by an insulated gap, the method comprising:
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providing an electronics cartridge carrying telemetry circuitry disposed on the first portion; providing a measure electrode and resistivity measurement circuitry disposed on the second portion and functionally connected to one another; providing an inductive coupler disposed on the first portion and electrically and functionally connecting the electronics cartridge to the resistivity measurement circuitry; producing a voltage across the insulated gap to drive an electric current into the formation surrounding the wellbore; maintaining the measure electrode at substantially the same potential as the second portion; obtaining telemetry information; and obtaining a resistivity measurement of the formation. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification