Matches 351 - 400 out of 434 < 1 2 3 4 5 6 7 8 9 >


Match Document Document Title
4785247 Drill stem logging with electromagnetic waves and electrostatically-shielded and inductively-coupled transmitter and receiver elements  
An apparatus and method for measuring formation parameters by transmitting and receiving electromagnetic signals by antennas disposed in recesses in a tubular housing member and including...
4780679 Method for determining low frequency conductivity of subsurface formations  
Well logging techniques are set forth for obtaining improved measurements of formation dielectric permittivity, conductivity, and water-filled porosity. The effects of dielectric and conductivity...
4779201 Borehole scanner and sonde position locator for spectral analysis of wall  
An optical head (12) is rotated while a sonde (11) is moved up or down within a bore hole (22), and a beam of light from a light source (22) is projected toward the wall of the bore hole (22) via...
4774471 Complex dielectric constant well logging means and method for determining the water saturation and the water resistivity of an earth formation  
A well logging system and method for determining the water saturation of an earth formation and the resistivity of the water using complex dielectric constant and formation porosity measurements....
4766384 Well logging apparatus for determining dip, azimuth, and invaded zone conductivity  
A well logging apparatus is disclosed which employs slot antennas having a plurality of conductive probes traversing the slot. Also disclosed are a logging apparatus having electrically isolated...
4730161 Dual frequency well logging system for determining the water resistivity and water saturation of an earth formation  
The present invention is a well logging method for determining the water saturation of an earth formation and the water's resistivity. Electromagnetic energy is transmitted into the earthen...
RE32563 Continuous wave medium frequency signal transmission survey procedure for imaging structure in coal seams  
Instrumentation and procedures for detecting geological anomalies occurring in layered coal formations. The instrumentation comprises a medium frequency continuous wave narrowband FM transmitter...
4712070 Apparatus for microinductive investigation of earth formations  
A wall-engaging apparatus for microinductively investigating a characteristic of earth formation traversed by a borehole includes an antenna set mounted in a longitudinally elongated body adapted...
4703277 Method and apparatus for obtaining properties of subsurface formations from textural models derived from formation parameters  
Well logging techniques are disclosed which use and/or measure formation textural parameters. A disclosed formation textural model is bimodal in nature, and includes fractions of spherical grains...
4703278 Well logging disc coil receiving means and method  
The present invention is a well logging receiver coil system which includes a coil. The system also includes a variable capacitor connected across the coil to form a resonant circuit tuned to a...
4700140 Determination of water or residual oil saturation in earth formations independent of lithology  
A method for determining the water or residual oil saturation of subsurface earth formations substantially independent of lithology utilizing electromagnetic energy propagation measurements. The...
4700141 Deep penetration well logging sonde  
A well logging system and method of the present invention determines the dielectric constant and/or conductivity of earth formations some of which have fluid invasion. The system and method of the...
4697190 Borehole located directional antennae means for electromagnetic sensing systems  
A directional antenna for an electromagnetic sensing system comprises a generally cylindrical tube of electrically-conductive material a portion of the tube being cut away to define a...
4692706 Well logging means and method for determining water saturation of a petroleum reservoir having two transmitters and two receivers  
Method and apparatus determining the water saturation of a petroleum reservoir earth formation include transmitting electromagnetic energy in the earth formation from within a borehole traversing...
4691166 Electromagnetic instruments for imaging structure in geologic formations  
Instrumentation and procedures for detecting geological anomalies occurring in layered coal formations. The instrumentation comprises a medium frequency continuous wave narrowband FM transmitter...
4689569 Directional antenna system for use in a borehole incorporating antenna dipole elements  
For use in logging a borehole through various formations of the earth, the preferred and illustrated embodiment of an RF transmitter system including antenna placed in the sonde is disclosed. The...
4670717 Borehole antenna array for determining radar incidence direction  
An antenna arrangement for use in a bore hole to receive radar signals and produce electrical signals from which the incidence direction of the radar signals can be determined includes a cross...
4659992 Method and apparatus for electromagnetic logging with reduction of spurious modes  
The disclosure is directed to an improved method and apparatus for subsurface electromagnetic logging in a borehole wherein means are provided to detect transverse magnetic mode components and to...
4652829 Electromagnetic logging apparatus with button antennas for measuring the dielectric constant of formation surrounding a borehole  
An electromagnetic logging apparatus is disclosed which employs dielectric-filled button antennas, in conjunction with tuning elements, to obtain improved operation. The apparatus can be used to...
4652828 Method and apparatus for determining dielectric permittivity of subsurface formations  
Well logging techniques are set forth for obtaining improved measurements of formation dielectric permittivity, conductivity, and water-filled porosity. The effects of dielectric and conductivity...
4651100 Antenna construction for well logging of subsurface earth formations  
Antenna apparatus for use in introducing electromagnetic energy into subsurface earth formations and acquiring measurements relating to propagation of such energy therethrough. Antenna...
4636731 Propagation anisotropic well logging system and method  
An anisotropic well logging system includes a well logging tool including a first transmitter coil spatially arranged within the well logging tool in a first predetermined manner and a second...
4617517 Determination of water saturation in earth formations independent of lithology  
A method for determining the water saturation of subsurface earth formations substantially independent of lithology utilizing electromagnetic energy propagation measurements. The subsurface...
4609873 Dielectric well logging system with at least three transmitter coils and at least two receiver coils for determining resistivity and dielectric constant of a subsurface formation adjacent a fluid invaded zone of the formation  
A dielectric well logging system is provided to determine dielectric constant and resistivity in formations invaded by water to determine oil and water saturations of the formations. Plural...
4603297 Logging device loaded with dielectric material to minimize spurious transverse magnetic mode components  
The disclosure is applicable to a borehole logging device of the type which includes an elongated body suspendable in a borehole and having at least one transmitting antenna and at least one...
4578645 Borehole logging tool utilizing electromagnetic energy in the determination of dip of subsurface formations surrounding a borehole  
An electromagnetic borehole logging tool has at least two antenna arrays positioned at spaced-apart locations along the longitudinal axis of the borehole tool. Each antenna array has at least...
4574242 Electromagnetic logging with reduction of spurious transverse magnetic components  
The disclosure is directed to an improved method and apparatus for subsurface electromagnetic logging in a borehole wherein means are provided to detect transverse magnetic mode components and to...
4553097 Well logging apparatus and method using transverse magnetic mode  
A well logging apparatus and method is disclosed which can be used as a wireline logging device or technique, and is also suitable for being employed in a logging-while-drilling device....
4547733 Amplitude and phase measurement in electromagnetic logging  
An electromagnetic logging apparatus for investigating properties of an earth formation surrounding a borehole comprises an electromagnetic energy transmitter and four receivers supported by a...
4538109 Apparatus and method for electromagnetic logging with reduction of spurious modes  
The disclosure is directed to an apparatus and method for subsurface electromagnetic logging in a borehole wherein means are provided to detect transverse magnetic mode components and to either...
4514693 Dielectric well logging system with electrostatically shielded coils  
Transmitting and receiving coils for radio frequency (RF) dielectric well logging are shielded in copper enclosures to substantially remove unwanted electrostatic or capacitive signals introduced...
4511843 Electromagnetic logging sonde having improved housing  
Apparatus for communicating electromagnetic energy between a logging tool and a surrounding medium comprise a support member, a radiating/receiving element disposed on one surface of a...
4511842 Electromagnetic logging device and method with dielectric guiding layer  
An improvement in signal level reception of an electromagnetic pad-type device in relatively conductive formations can be achieved by providing a layer of dielectric material that abuts the...
4502010 Apparatus including a magnetometer having a pair of U-shaped cores for extended lateral range electrical conductivity logging  
A method of well logging in petroleum exploration and apparatus for use in the method as described. An improved magnetometer is disposed in a well bore to provide indications of the distribution,...
4502121 Machine method for determining the presence and location of hydrocarbon deposits within a subsurface earth formation  
In accordance with illustrative embodiments of the present invention, methods for processing well logging data comprises deriving measurements of a plurality of earth formations parameters and...
4489276 Dual-cone double-helical downhole logging device  
A broadband downhole logging device includes a double-helix coil wrapped over a dielectric support and surrounded by a dielectric shield. The device may also include a second coil longitudinally...
4469451 Method and apparatus for measuring temperature of an earth formation in the presence of a radio frequency electromagnetic field  
A method and apparatus for measuring the temperature in a subsurface earth formation that is being heated in situ by subjection to a radio frequency electromagnetic field. It includes lowering a...
4461997 Non-conductive logging sonde housing  
A logging sonde housing includes a stack of ceramic rings (26) surrounded by a first layer (33) of reinforced plastic material. Elastic seals (28) are placed between the rings and kept under...
4451789 Logging tool and method for measuring resistivity of different radial zones at a common depth of measurement  
A wireline logging system for measuring formation resistivity includes a longitudinal housing having three transmitters and three receivers arranged at measured distances on the housing, with...
4446433 Apparatus and method for determining directional characteristics of fracture systems in subterranean earth formations  
The present invention is directed to a wireless fracture-mapping tool utilized for determining fracture directional and length characteristics of hydraulically induced fractures in subterranean...
4427941 Temperature compensated well logging tool  
A well logging tool adapted for use in a borehole traversing an earth formation includes at least one sensor sensing at least one characteristic of the earth formation. Another sensor senses the...
4422043 Electromagnetic wave logging dipmeter  
An improvement to dipmeter logs has very closely spaced radio frequency sensor coils mounted in pairs in each of the formation contacting pads. A transmitter mounted in a sonde emits the radio...
4401947 Small hole well logging sonde and system with transmitter and receiver assemblies  
A well logging sonde has an outer diameter of 1-11/16 inches or less and includes a transmitter coil and at least two receiver coils. The coils are contained in a coil housing. A transmitter...
4396062 Apparatus and method for time-domain tracking of high-speed chemical reactions  
A novel apparatus and method for time-domain tracking of high-speed chemical reactions. The apparatus of this invention includes a feedback system for controlling the RF frequency of an RF...
4369497 Machine method and apparatus for determining the presence and location of hydrocarbon deposits within a subsurface earth formation  
In accordance with illustrative embodiments of the present invention, methods for processing well logging data comprise deriving measurements of a plurality of earth formation parameters and...
4338567 Apparatus and method for determination of bound water in subsurface formations  
The disclosure is directed to an apparatus and method for determining the bound-water-filled porosity of formations surrounding a borehole. Bound-water-filled porosity is the fraction of the...
4323848 Plural sensor magnetometer arrangement for extended lateral range electrical conductivity logging  
A method of well logging in petroleum exploration and apparatus for use in the method is described. An improved magnetometer is disposed in a well bore to provide indications of the distribution,...
4319191 Dielectric well logging with radially oriented coils  
A dielectric well logging system has its coils aligned radially, rather than in alignment, with respect to the longitudinal axis of a sonde which moves the coils through a borehole. Improved...
4308499 Method utilizing electromagnetic wave pulses for determining the locations of boundary surfaces of underground mineral deposits  
The locations of compositional discontinuities in salt deposits and the like are determined by measuring the travel time of electromagnetic waves reflected off of boundary surfaces between...
4300098 Microwave electromagnetic logging with mudcake correction  
The disclosure is directed to a technique used for determining the mudcake-corrected water-filled porosity of formations surrounding a borehole, and which can also be used for determining the...

Matches 351 - 400 out of 434 < 1 2 3 4 5 6 7 8 9 >