US Patent No: 7,759,943
Number of patents in Portfolio can not be more than 2000
Subsurface electromagnetic measurements using cross-magnetic dipoles
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Jul 20, 2010
Issued date -
May 22, 2007
filing date -
11/752,112
serial no -
In Force
status
Importance
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Abstract
Sensor assemblies including transmitter and receiver antennas to respectively transmit or receive electromagnetic energy. The sensor assemblies are disposed in downhole tools adapted for subsurface disposal. The receiver is disposed at a distance less than six inches (15 cm) from the transmitter on the sensor body. The sensor transmitter or receiver includes an antenna with its axis tilted with respect to the axis of the downhole tool. A sensor includes a tri-axial system of antennas. Another sensor includes a cross-dipole antenna system.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 4,302,722 Induction logging utilizing resistive and reactive induced signal components to determine conductivity and coefficient of anisotropy | 64 | 1979 | |
| 4,857,852 Induction well logging apparatus with transformer coupled phase sensitive detector | 31 | 1988 | |
| 5,168,234 Method and apparatus for measuring azimuthal as well as longitudinal waves in a formation traversed by a borehole | 12 | 1990 | |
| 5,235,285 Well logging apparatus having toroidal induction antenna for measuring, while drilling, resistivity of earth formations | 118 | 1991 | |
| 6,191,588 Methods and apparatus for imaging earth formation with a current source, a current drain, and a matrix of voltage electrodes therebetween | 40 | 1998 | |
| 6,297,639 Method and apparatus for directional well logging with a shield having sloped slots | 74 | 1999 | |
| 6,788,065 Slotted tubulars for subsurface monitoring in directed orientations | 7 | 2000 | |
| 6,566,881 Shielding method and apparatus using transverse slots | 42 | 2000 | |
| 6,584,408 Subsurface formation parameters from tri-axial measurements | 19 | 2001 | |
| 6,557,794 Coil shielding method for selective attenuation of an electromagnetic energy field component | 19 | 2001 | |
| 6,768,299 Downhole magnetic-field based feature detector | 5 | 2001 | |
| 6,667,620 Current-directing shield apparatus for use with transverse magnetic dipole antennas | 34 | 2002 | |
| 6,690,170 Antenna structures for electromagnetic well logging tools | 32 | 2002 | |
| 7,382,135 Directional electromagnetic wave resistivity apparatus and method | 10 | 2004 | |
| 7,202,670 Method for characterizing a subsurface formation with a logging instrument disposed in a borehole penetrating the formation | 19 | 2004 | |
| 7,536,261 Anti-symmetrized electromagnetic measurements | 3 | 2006 | |
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| 6,493,632 Water saturation and sand fraction determination from borehole resistivity imaging tool, transverse induction logging and a tensorial water saturation model | 17 | 1999 | |
| 6,600,321 Apparatus and method for wellbore resistivity determination and imaging using capacitive coupling | 48 | 2002 | |
| 6,711,502 Water saturation and sand fraction determination from borehole resistivity imaging tool, transverse induction logging and a tensorial water saturation model | 16 | 2002 | |
| 6,957,708 Electrical imaging in conductive and non-conductive mud | 14 | 2003 | |
| 2007/0257,679 Method and Apparatus for a Multi-component Induction Instrument Measuring System for Geosteering and Formation Resistivity Data Interpretation in Horizontal, Vertical and Deviated Wells | 3 | 2007 | |
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| 6,163,155 Electromagnetic wave resistivity tool having a tilted antenna for determining the horizontal and vertical resistivities and relative dip angle in anisotropic earth formations | 88 | 1999 | |
| 6,476,609 Electromagnetic wave resistivity tool having a tilted antenna for geosteering within a desired payzone | 67 | 2000 | |
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| 4,697,190 Borehole located directional antennae means for electromagnetic sensing systems | 20 | 1985 | |
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| 4,383,220 Microwave electromagnetic borehole dipmeter | 19 | 1981 | |
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| 6,147,496 Determining electrical conductivity of a laminated earth formation using induction logging | 62 | 1997 | |
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| 6,975,120 Measurement of subterranean lithology using electromagnetic energy | 6 | 2002 | |
| 2009/0179,648 COMBINED PROPAGATION AND LATERAL RESISTIVITY DOWNHOLE TOOL | 1 | 2009 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 3.5 Year Payment | $1600.00 | $800.00 | $400.00 | Jan 20, 2014 |
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Jan 20, 2018 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Jan 20, 2022 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 3.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge - 7.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |