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8173955 |
Methods and apparatus to optically determine velocities of downhole fluids
Methods and apparatus to optically determine velocities of downhole fluids are disclosed. Some example methods to determine a velocity of a downhole fluid include exciting a fluorescent substance...
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8164050 |
Multi-channel source assembly for downhole spectroscopy
A multi-channel source assembly for downhole spectroscopy has individual sources that generate optical signals across a spectral range of wavelengths. A combining assembly optically combines the...
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8146655 |
Methods and apparatus for downhole characterization of emulsion stability
A method (and corresponding apparatus) for downhole fluid analysis of petroleum formation fluids. The method includes capturing in a chamber of a downhole tool at least two immiscible formation...
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8141633 |
Detecting fluids in a wellbore
In one general implementation, a method for identifying fluids in a wellbore includes generating light in a visible spectrum from a light source in a production wellbore; generating light in an...
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8143570 |
Method and apparatus for detecting while drilling underbalanced the presence and depth of water produced from the formation
The invention relates to methods and apparatus for determining a downhole parameter in an underbalanced drilling environment which include: selectively activating a first fluid flowing from the...
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8138471 |
X-ray backscatter device for wellbore casing and pipeline inspection
An apparatus for inspection in situ of a wellbore casing and a pipeline from inside the wellbore or pipeline. The apparatus includes a penetrating radiation source such as x-rays, a rotatable beam...
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8076634 |
Neutron shielding for downhole tool
A downhole tool for performing measurement of a formation. The tool comprising a housing surrounding a source for generating neutrons and a detector for detecting the neutrons. A shield is located...
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8071937 |
Methods, systems, and computer program products for measuring the density of material including a non-nuclear moisture property detector
The subject matter described herein includes methods, systems, and computer program products for measuring the density of a material. According to one aspect, a material property gauge includes a...
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8049164 |
Azimuthal elemental imaging
Measurements made by a natural gamma ray tool are used to provide an elemental composition of an earth formation. Additional measurements made with a pulsed neutron tool with two or more gamma ray...
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8039792 |
Wide band gap semiconductor photodetector based gamma ray detectors for well logging applications
A gamma ray detector uses a scintillation detector having a response that matches a response characteristic of a photodiode. The detector may be used to measure natural gamma rays and/or gamma rays...
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8039793 |
Water detection and 3-phase fraction measurement systems
Methods and apparatus enable monitoring a hydrocarbon well for water within a flow stream of the well. A water detector includes a light source for emitting into a flow stream infrared light that...
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8039791 |
Downhole fluid spectroscopy
An example method for determining a partial density of a compound in a downhole fluid may comprise exposing the downhole fluid to an electromagnetic radiation, and measuring a spectrum of radiation...
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8032311 |
Estimating gas-oil ratio from other physical properties
A method for characterizing a desired property of a fluid downhole is described. In some non-limiting examples, the method comprises receiving an input signal representing sound speed of a fluid...
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7969571 |
Evanescent wave downhole fiber optic spectrometer
An apparatus for estimating a property of a fluid downhole, is provided an includes: an optical fiber that receives light emitted from a light source and including an unclad portion adapted for...
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7960687 |
Sourceless downhole X-ray tool
Systems, methods, and devices relating to a sourceless X-ray downhole tool are provided. By way of example, such a downhole tool may include an X-ray generator, an X-ray detector, and data...
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7946341 |
Systems and methods for distributed interferometric acoustic monitoring
Acoustic monitoring of a conduit, a wellbore or a reservoir associated with hydrocarbon production or transportation and/or carbon dioxide sequestration is carried out using a fibre optic cable...
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7948620 |
Method and apparatus for performing spectroscopy downhole with a wellbore
An analysis system, tool, and method for performing downhole fluid analysis, such as within a wellbore. The analysis system, tool, and method provide for a tool including a spectroscope for use in...
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7928360 |
Methods, systems, and computer program products for measuring the density of material including a non-nuclear moisture property detector
The subject matter described herein includes methods, systems, and computer program products for measuring the density of a sample construction material. According to one aspect, a nuclear density...
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7902501 |
Ion mobility spectrometer and method for operation
A method for operating an ion mobility spectrometer comprises supplying an analyte substance into a reaction chamber of an ion mobility spectrometer having a closed internal gas circuit and at...
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7884320 |
Ion mobility spectrometer with substance collector
A method for operating an ion mobility spectrometer that comprises a measuring tube, a substance collector and a membrane inlet, the measuring tube, the substance collector and the membrane inlet...
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7852468 |
Fiber optic refractometer
A downhole refractometer apparatus and method include a light source, an optical fiber that receives light emitted from the light source and a fluid cell that receives a downhole fluid. A metalloid...
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7834312 |
Water detection and 3-phase fraction measurement systems
Methods and apparatus enable monitoring a hydrocarbon well for water within a flow stream of the well. A water detector includes a light source for emitting into a flow stream infrared light that...
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7807962 |
Borehole tester apparatus and methods for using nuclear electromagnetic radiation to determine fluid properties
Apparatus and methods for determining one or more fluid parameters of interest by irradiating fluid with a source of nuclear electromagnetic radiation and subsequently measuring attenuation and...
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7782460 |
Laser diode array downhole spectrometer
Apparatus and method for downhole formation testing using a spectrometer includes a carrier conveyable into a well borehole that traverses a subterranean formation of interest, a plurality of...
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7763845 |
Downhole navigation and detection system
A photodiode whose long-wavelength cutoff is in the short-wavelength range (preferably, between ultraviolet and yellowish-green) having reduced temperature sensitivity is used in downhole...
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7750302 |
Method and apparatus for detecting naphthenic acids
A method and apparatus for determining the concentration of organic acids in formation fluids is provided including pumps for pumping fluids from a subterranean formation into the body of a...
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7741605 |
Method and apparatus for detecting gas conveyed by drilling fluids
A method of detecting gas conveyed in a drilling fluid (M) returning from a well (26), which method comprises the steps of: (a) extracting gas from said drilling fluid (M);(b) transmitting...
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7733490 |
Apparatus and methods to analyze downhole fluids using ionized fluid samples
Apparatus and methods to analyze downhole fluids are described herein. A disclosed example method involves obtaining a sample of a downhole fluid, and depressurizing at least a portion of the...
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7728971 |
Method and apparatus for performing spectroscopy downhole within a wellbore
An analysis system, tool, and method for performing downhole fluid analysis, such as within a wellbore. The analysis system, tool, and method provide for a tool including a spectroscope for use in...
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7705982 |
Methods and apparatus for analyzing fluid properties of emulsions using fluorescence spectroscopy
This relates to methods and apparatus for analyzing samples by fluorescence spectroscopy. In one embodiment, the methods and apparatus use a fluorescence detection unit (FDU) of a composition fluid...
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7700910 |
Method of compensating a density log
A method of compensating a density log comprises the step of compensating the far density by adding a correction at a given point in the density log wherein: (a) the correction comprises at least a...
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7687770 |
Methods and apparatus for multi dimension fluorescence spectrum measurement downhole
Some principles described herein contemplate implementation of downhole imaging for the characterization of formation fluid samples in situ, as well as during flow through production tubing,...
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7675029 |
Apparatus and a method for visualizing target objects in a fluid-carrying pipe
An apparatus for recording and displaying images of and identifying material types in a target object in a fluid carrying conduit includes a downhole unit. The downhole unit includes a controllable...
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7675030 |
Logging system and method for in-situ fluids sensing through optical fiber with attenuation compensation
A method for optically sampling characteristics of subsurface fluids within a wellhole using continuous, non-pulsed light transmitted downhole in optical fibers for both sampling and reference...
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7644611 |
Downhole fluid analysis for production logging
A downhole fluid analysis tool capable of fluid analysis during production logging that includes a phase separator and a plurality of sensors to perform analysis on the fluids collected at a...
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7646480 |
Borehole imaging
Apparatus for imaging the wall of a borehole drilled through an underground formation, comprising: a light source; an optical detector device such as a CCD camera; a sensor head including a window...
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7639781 |
X-ray tool for an oilfield fluid
An x-ray tool for determining a characteristic of an oilfield fluid. The tool may include a generator portion housing a collimator about a target from which x-rays are emitted. In this manner...
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7638761 |
High temperature downhole tool
Apparatus and method for estimating a downhole parameter include a high-gain semiconductor device having a plurality of semiconductor layers forming an active region, the active region having a...
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7635838 |
Methods and apparatus for exploring geological formations utilizing strontium measurements
Formation strontium concentrations are measured utilizing a borehole tool. A log may be provided as a function of depth or distance. The strontium measurements can be correlated...
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7622726 |
Dual neutron-gamma ray source
A dual neutron-gamma ray source comprises a compact neutron generator, a shield, a collimator, and an internal gamma target. The shield surrounds the compact neutron generator. The collimator...
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7622709 |
Variable-ratio neutron-gamma ray source
A variable-ratio neutron-gamma ray source comprises a neutron generator, a shield, a collimator, and an external gamma target. The neutron generator generates neutrons and the shield reduces...
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7615741 |
Determining organic carbon downhole from nuclear spectroscopy
Elemental analysis of an earth formation is obtained using measurements from a gamma ray logging tool. From the elemental analysis, an estimate of the Calcium, Magnesium and Carbon content of the...
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7609380 |
Real-time calibration for downhole spectrometer
An apparatus for performing real-time analysis of a subterranean formation fluid includes a light source configured to transmit at least a sample signal through a sample of the subterranean...
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7601950 |
System and method for downhole optical analysis
A method for measuring optical properties of a fluid downhole, the method comprising measuring intensity of light interacting with the fluid downhole for each of one or more wavelengths;...
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7599469 |
Non-intrusive pressure gage
In accordance with one exemplary embodiment, the present invention provides a sensor system for detecting a change in condition. The system includes a radioactive source. This system also includes...
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7595876 |
Method and apparatus for estimating a property of a fluid downhole
A method for estimating a property of a fluid downhole is disclosed, the method including but not limited to exposing the fluid to light downhole; directing different wavelengths of light that have...
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7573027 |
Measurement of standoff corrected photoelectric factor
A photoelectric factor (PEF) that is corrected for standoff effects is obtained from measurements made with a single detector. A first PEF is obtained using a first pair of soft and hard windows...
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7534995 |
Device for examining rotor drilled holes
A probe for inspecting an anchor borehole has a video head provided with a color CCD sensor, a lens, a conical viewing window, and light-emitting diode for illuminating and optically scanning a...
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7511813 |
Downhole spectral analysis tool
Spectral analysis system for downhole applications is provided utilizing an inorganic replica-type grating that is configured to operate as a diffractive element that provides broad spectral...
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7507952 |
Apparatus and method for fluid density determination
A fluid density determination apparatus and method comprising an X-ray generator emitting a high energy radiation signal and a low energy radiation signal; a sample cell housing a sample of...
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