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7566869 |
Measurement of water-oil saturation using pulsed neutron instrumentation
A method, apparatus, and machine-readable medium for evaluating an earth formation having a fluid mixture including oil and water therein. The earth formation is irradiated with a source and...
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7394064 |
Measuring the weight on a drill bit during drilling operations using coherent radiation
One embodiment includes an apparatus that includes a coherent radiation source to emit coherent radiation through a signal carrier that is positioned along at least a part of a length of a downhole...
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7276715 |
Method and apparatus for safely handling radioactive sources
A system for handling a radioactive source includes a container containing a radioactive source and a cap mounted on the container to retain the radioactive source inside the container. The cap has...
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7173239 |
Method and apparatus for downhole quantification of methane using near infrared spectroscopy
The present invention describes a unique method and apparatus for applying near-infrared spectroscopy to estimate weight percent of methane in crude oil from which one can then infer gas-oil ratio...
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6927390 |
Gamma ray spectroscopy logging-while-drilling system
A system for measuring elemental compositions and other properties of earth formation penetrated by a borehole, wherein the measurements are made while drilling the borehole. The downhole...
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6918293 |
System and method having radiation intensity measurements with standoff correction
We disclose density measurement methods that are accurate over an extended range of standoff distances. One method embodiment includes: a) obtaining a standoff distance, a near detector count rate,...
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6907944 |
Apparatus and method for minimizing wear and wear related measurement error in a logging-while-drilling tool
A tool is presented for making density measurements of a formation surrounding a wellbore, comprising a collar housing in a drill string. The housing has at least one first section with a first...
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6814162 |
One cone bit with interchangeable cutting structures, a box-end connection, and integral sensory devices
A drill bit, comprising a bit body, a sensor disposed in the bit body, a single journal removably mounted to the bit body, and a roller cone rotatably mounted to the single journal.
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6666285 |
Logging-while-drilling apparatus and methods for measuring density
Logging-while-drilling gamma ray back scatter density system with elements configured to minimize material between sensor and the borehole environs, maximize shielding and collimation efficiency,...
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6648083 |
Method and apparatus for measuring mud and formation properties downhole
A method is disclosed for determining a characteristic of a mud mixture surrounding a drilling tool within a borehole in which a drilling tool is received. The method includes turning the tool in...
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6596998 |
Method and system for identifying the source of a signal
A method for determining which of a plurality of detectors transmitted a signal, such as a signal related to neutron or gamma emissions, includes connecting each of the detectors to a single cable,...
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6585044 |
Method, system and tool for reservoir evaluation and well testing during drilling operations
A novel method, system and tool for performing formation and well evaluation while drilling are disclosed. These inventions determine the properties of a particular formation within a reservoir as...
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6403740 |
Vinyl fluoride interpolymers
Interpolymers of 1-99 mol % vinyl fluoride and 99-1 mol % of at least one highly fluorinated monomer such as tetrafluoroethylene are disclosed. The interpolymers are characterized by the presence...
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6307199 |
Compensation of errors in logging-while-drilling density measurements
A system is disclosed for compensating well logs for adverse effects of the borehole and near borehole formation effects. The system is configured primarily for processing logging-while-drilling...
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6300624 |
Radiation detector
The invention is a stationary radiation detection tool that provides an azimuthal indication of the location of subterranean radiation sources. In one embodiment, the tool has four gamma ray...
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6275645 |
Method of and apparatus for subsurface exploration
A method and probe for subterranean determination of the concentration of a substance has a light-conducting optical fiber running from above the ground to a measurement cell below the ground. The...
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6233746 |
Multiplexed fiber optic transducer for use in a well and method
An optic sensor for use in a well is provided. The sensor can be configured to sense downhole conditions, such as temperature, pressure, or stress, either individually or in combination. The optic...
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6140637 |
Method and apparatus for fluorescence logging
A method of locating in situ hydrocarbons in underground formations comprises illuminating the borehole wall with light such as visible, infrared or ultraviolet light or combinations of these, from...
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5744803 |
Radiation detector assembly and method with discrimination between vibration and radiation induced events
A well logging instrument and method that remove vibration induced noise from the output of a detector including a scintillation crystal. The invention is based on a realization that pulses induced...
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5635711 |
Apparatus and method for the suppression of microphonic noise in proportional counters for borehole logging-while-drilling
A method and apparatus is disclosed for suppressing microphonic noise in proportional counter neutron detection in borehole logging-while-drilling measurements. Noise is reduced by (1) applying the...
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5608215 |
Method and apparatus for determining density of earth formations
Apparatus for determining the density of underground formations surrounding a borehole, such as a wireline logging tool or a logging-while-drilling tool, includes a high energy neutron source for...
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5517024 |
Logging-while-drilling optical apparatus
A logging-while-drilling apparatus includes a source of exciting radiation, means for illuminating the borehole wall with the radiation and means for detecting radiation returning from the borehole...
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5486695 |
Standoff compensation for nuclear logging while drilling systems
A standoff compensation system is disclosed for use in an LWD system implementing gamma density and/or neutron porosity measurements. An acoustic transducer is provided to measure the standoff...
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5483061 |
Gamma ray scintillation detector apparatus and method for reducing shock induced noise
A method and apparatus is disclosed for distinguishing gamma ray induced pulses from shock induced pulses of a scintillation detector used in logging while drilling tools. The method and apparatus...
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5456106 |
Modular measurement while drilling sensor assembly
A modular measurement while drilling sensor assembly is presented. A typical cross-over assembly for mating with a measurement while drilling (MWD) tool is connected to a typical positive...
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5451779 |
Formation density measurement apparatus and method
A method and apparatus for determining at least one characteristic of a formation is provided which includes storing a plurality of counts received from both a long space radiation detector and a...
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5419395 |
Eccentric fluid displacement sleeve
An eccentric fluid displacement sleeve is disclosed for use with a measurement-while-drilling instrument, to convert the instrument for use in different size boreholes. The sleeve is made eccentric...
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5397893 |
Method for analyzing formation data from a formation evaluation measurement-while-drilling logging tool
A method for analyzing data from a measurement-while-drilling (MWD) formation evaluation logging tool which compensates for rotation of the logging tool (along with the rest of the drillstring)...
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5357797 |
Method and apparatus for correcting MWD porosity measurement
A porosity measuring MWD system utilizing a source and two detectors is set forth. The source and two detectors are preferably mounted in a stabilizer fin on a drill collar. A standoff measuring...
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5351532 |
Methods and apparatus for making chemical concentration measurements in a sub-surface exploration probe
An in-hole oil-drilling probe is mountable in a drill string to measure hydrocarbon concentrations in drilling fluid flowing around the drill string. The probe consists of a drill collar which is...
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5321982 |
Method for measuring the rate of penetration of an equipment progressing in a well
The method comprises using a transmitting unit and at least two receiving units (8,10) arranged in two different places along well equipment (2). Each receiving unit forms an image or signature of...
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5278550 |
Apparatus and method for retrieving and/or communicating with downhole equipment
Method and apparatus for fishing for and/or communicating with subsurface apparatus. In a preferred embodiment, a subsurface logging-while-drilling (LWD) or measuring-while-drilling (MWD) apparatus...
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5251708 |
Modular connector for measurement-while-drilling tool
A downhole tool for use in measurement-while-drilling applications includes modular ring connectors on opposed ends thereof with the ring connectors being interconnected by a single bus for...
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5250806 |
Stand-off compensated formation measurements apparatus and method
Apparatus and method for measuring density, porosity and other formation characteristics while drilling is disclosed. The apparatus, preferably housed in a drill collar and placed within a drill...
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5216242 |
Apparatus for nuclear logging employing sub wall mounted detectors and modular connector assemblies
An apparatus for nuclear logging is presented. In accordance with the present invention, nuclear detectors and electronic components are all mounted in chambers within the sub wall with covers...
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5206505 |
Apparatus and method for retrieving and evaluating a slim hole drilled core sample of a subsurface formation
A coring tool is lowered to the bottom of a wellbore through a subsurface formation. A coring bit at the lower end of the coring tool draws a core sample of the subsurface formation at the bottom...
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5184692 |
Retrievable radiation source carrier
A retrievable radiation source carrier assembly for a logging while drilling tool is disclosed. The carrier includes a solid rod or member of high strength and low elastic modulus that connects the...
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5175429 |
Stand-off compensation for nuclear MWD measurement
The present invention relates generally to increasing the accuracy of MWD nuclear based measurement systems. Specifically, the present invention provides a secondary measurement system for...
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5165275 |
Compensated gamma ray mudlog
A method and apparatus for measuring the gamma radiation levels of drilling mud expelled from an oil and gas bore hole to determine the composition of the earth at the bottom of the bore hole and,...
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5134285 |
Formation density logging MWD apparatus
A measurement-while-drilling (MWD) density tool is provided which incorporates a single gamma ray source and a pair of longitudinally displaced and mutually aligned detector assemblies (i.e., dual...
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5061849 |
Externally mounted radioactivity detector for MWD employing radial inline scintillator and photomultiplier tube
Improved radioactivity well logging by mounting a scintillator and photomultiplier tube in a single case interfacing with a hole extending through a drill collar at the lower end of a drill string...
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5058425 |
Earthen core analyzing means and method for determining the methane storage capacity of the core
An analyzer includes a test cell which contains a core of coal from a coal bed methane reservoir. A tomographic system is used for testing the core at different times and provides signals...
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5047635 |
Down-hole probe assemblies
A downhole probe for use in conditions of high vibration or shock comprises a vibration-sensitive inner unit having a cylindrical outer surface, an outer casing having a cylindrical inner surface...
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5023450 |
Method for discriminating microphonic noise in proportional counters
This disclosure is directed to a detector system for use in measuring while drilling (MWD) equipment. It comprises preferably duplicate chambers positioned to one another and mounted in a MWD...
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5017778 |
Methods and apparatus for evaluating formation characteristics while drilling a borehole through earth formations
The MWD methods and MWD apparatus disclosed herein include methods and apparatus for rotating a directionally-responsive radiation sensor having an outwardly-directed response axis in a borehole....
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4894534 |
Logging apparatus and method
Downhole measuring apparatus includes a gamma radiation source and at least two pairs of radiation detectors carried by a housing so that radiation may be emitted from the source and scattered by...
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4879463 |
Method and apparatus for subsurface formation evaluation
A measurement while drilling nuclear tool adapted to be coupled in the drill string to make formation evaluations and methods of using are described. A neutron source is positioned on the...
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4845359 |
Methods and apparatus for safely handling radioactive sources in measuring-while-drilling tools
A method for moving a radioactive source into and out of a well logging tool incorporated in the drill string is disclosed. Prior to moving the source, the logging tool is positioned sufficiently...
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4814609 |
Methods and apparatus for safely measuring downhole conditions and formation characteristics while drilling a borehole
A borehole logging apparatus for performing radiation based measurements has a tubular body for movement through a borehole. The tubular body includes an upwardly opening passage and an interior...
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4810459 |
Method and apparatus for determining true formation porosity from measurement-while-drilling neutron porosity measurement devices
A method and apparatus for determining true formation porosity utilize downhole measurement-while-drilling neutron porosity measurement devices. A initial measurement is taken shortly after the...
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