Formation resistivity measurements using phase controlled currents
US-9223047-B2 · Dec 29, 2015 · US
Apparatus and method for formation resistivity measurements in oil-based mud using a floating reference signal
US8965704B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8965704-B2 |
| Application number | US-201213359608-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 27, 2012 |
| Priority date | Mar 31, 2011 |
| Publication date | Feb 24, 2015 |
| Grant date | Feb 24, 2015 |
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Abstract
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Disclosed is an apparatus for estimating a property of an earth formation penetrated by a borehole containing an oil-based drilling fluid. The apparatus includes an electrode disposed at a carrier and configured to inject alternating current into the formation. An electrically conductive plate is disposed between the first electrode and a borehole wall. An electrical insulator is disposed between and contacts the first electrode and the conductive plate. The apparatus is configured to prevent the drilling fluid from being disposed between the first electrode and the conductive plate. A first sensor is used to measure an electric field established between the first electrode and the conductive plate. A processor is configured to receive a measurement of the electric field to use as a floating reference signal to determine a phase difference with respect to a measured electrical quantity related to the injected electrical current in order to estimate the property.
First claim
Opening claim text (preview).
What is claimed: 1. An apparatus for estimating a property of an earth formation penetrated by a borehole containing oil-based drilling fluid, the apparatus comprising: a carrier configured to be conveyed through the borehole; a first electrode disposed at the carrier and configured to inject electrical current at frequency ƒ into the earth formation; an electrically conductive plate disposed between the first electrode and a wall of the borehole; an electrical insulator dis…
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- G01V3/24Primary
Physics · mapped topic
Fixed Constructions · mapped topic
Physics · mapped topic
Fixed Constructions · mapped topic
Fixed Constructions · mapped topic
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Frequently asked questions
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- What does patent US8965704B2 cover?
- Disclosed is an apparatus for estimating a property of an earth formation penetrated by a borehole containing an oil-based drilling fluid. The apparatus includes an electrode disposed at a carrier and configured to inject alternating current into the formation. An electrically conductive plate is disposed between the first electrode and a borehole wall. An electrical insulator is disposed betwe…
- Who is the assignee on this patent?
- Tabarovsky Leonty A, Forgang Stanislav W, Baker Hughes Inc
- What technology area does this patent fall under?
- Primary CPC classification G01V3/24. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Feb 24 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).