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7432499 |
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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7323341 |
Stable isotopic identification and method for identifying products by isotopic concentration
A stable isotopic identification comprising a mathematical array of concentrations of isotopes found in a product, said mathematical array being presented in a machine readable form and comparable...
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7212283 |
Imaging sensor optical system
The present invention relates to an in-vessel or down-hole optical imaging sensor or system for operating in structures which may contain media with different spectral transmission characteristics....
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6472660 |
Imaging sensor
The present invention relates to an imaging sensor, particularly for use in oil-filled passages such as wells or pipelines, or for passages containing other similar viscous fluids. There is...
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6037585 |
Determination of radioactive scale distribution using gamma ray logging technique
A method for calculating the position and quantity of scale downhole, while avoiding the need to run a before log is provided. The method includes assessing the gamma ray spectra of both scale and...
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6001280 |
Oil-soluble tracer solutions containing gadolinium compounds
A tracer solution suitable for use in measuring flow velocities in a borehole, includes: a) a gadolinium salt of a carboxylic acid of general formula ##STR1## where R is an alkyl of not less than...
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5929437 |
Encapsulated radioactive tracer
Radioactive particles are provided for use in tracing the flow path in or near a well of fluids injected into the well. The particles include an element which can be made radioactive by bombardment...
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5723781 |
Borehole tracer injection and detection method
The present invention generally pertains to apparatus and a method for continuously injecting a tracer in a borehole to thereby enable continuously measuring the flow of effluents in the borehole,...
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5711900 |
Gadolinium compounds for use as oil-soluble tracers
A tracer solution suitable for use in measuring flow velocities in a borehole, includes: a) a gadolinium salt of a carboxylic acid of general formula ##STR1## where R is an alkyl of not less than...
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5635712 |
Method for monitoring the hydraulic fracturing of a subterranean formation
A method for real-time monitoring of fracture extension during a fracturing treatment of a producing subterranean formation. A radioactive tracer injector is coupled to and spaced from a gamma ray...
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5569914 |
Method for measuring height of fill in a production tubing/casing annulus
The location in a wellbore of the top of a quantity of fill material which is sufficient to restrict flow in a tubing/casing annulus at a location deep in a well is determined by dropping a...
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5543617 |
Method of measuring flow velocities using tracer techniques
A method of measuring flow velocities in flowing fluids includes injecting into the flow a non-radioactive tracer having a neutron capture cross section higher than that of the flowing fluids, for...
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5442173 |
Method and system for real-time monitoring of earth formation fracture movement
A method of monitoring formation fractures in real-time is performed in which a fluid containing a radio-active tracer element is pumped at a high pressure down a wellbore into a formation. As the...
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5410152 |
Low-noise method for performing downhole well logging using gamma ray spectroscopy to measure radioactive tracer penetration
A method for evaluating the penetration of downhole materials such as proppant, casing annulus fill, or packed gravel by radioactively tagging the material, conducting well logging with gamma ray...
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5404010 |
Method of well logging in fractured subterranean formation
In a method of logging a well in a subterranean formation which formation has been fractured by injecting proppant tagged with at least one radioactive material into the formation through the well,...
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5306911 |
Method for determining the flow rate of aqueous phases in a multiphase flow
A method for determining at least one dynamic flow characteristic of a multiphase flow circulating in a pipe, said flow being composed of an aqueous phase and a hydrocarbon (oil) phase. Oxygen...
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5285065 |
Natural gamma ray logging sub
A natural gamma tag marking materials for sub or permanent markers used in gamma logging operations, such natural gamma materials having a gamma count of between 200 and 1000 counts per second. The...
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5267274 |
Method of fission track analysis utilizing bulk chemical etching of apatite
A method of analysis of rock samples taken from the bore of a well being drilled or from the Earth's surface and performed upon the apatite grains contained within the samples. The apatite grains...
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5250807 |
Sand detector
A method of measuring or detecting an unknown distribution and content of solid material in a flow of liquid and gas is achieved without any calibration. One or several activated probes or...
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5243190 |
Radioactive tracing with particles
There is provided radioactive particles having a ceramic matrix and an element which can be bombarded with neutrons to produce a gamma ray-emitting isotope. The particles are manufactured by mixing...
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5225674 |
Method of delineating naturally fractured intervals in subterranean formations
A potassium salt which is soluble either in water or in an oil-based drilling mud is forced via filtrate invasion into permeable subsurface formation zones adjacent a well borehole via an...
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5219518 |
Nuclear oxygen activation method and apparatus for detecting and quantifying water flow
A nuclear spectroscopy method and apparatus for obtaining qualitative and quantitative information related to water flow, comprising the steps of: (1) irradiating the water flow with a source of...
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5191210 |
Produced steam survey device and method
A device and method for determining the flow of steam in a production well has a sonde with a pair of gamma ray detectors and a source of gaseous radioactive material therein. The sonde is lowered...
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5182051 |
Raioactive tracing with particles
There is provided radioactive particles having a ceramic matrix and an element which can be bombarded with neutrons to produce a gamma ray-emitting isotope. The particles are manufactured by mixing...
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5164591 |
Radioactive tracer well logging utilizing bromine
Radioactive tracer well logging has typically utilized iodine as a source of gamma rays. Bromine-82 is utilized as the source of gamma radiation in this process. Because bromine-82 emits more...
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5077471 |
Method and apparatus for measuring horizontal fluid flow in downhole formations using injected radioactive tracer monitoring
Formation fluid flows in earth formations (37) opposite a perforated (40) wellbore (15) zone are measured and monitored by injecting radioactive tracers (50) into the perforations (40), blocking...
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5072387 |
Method for determining a transit time for a radioactive tracer
An improved method for deteriming the transit time of a radioactive tracer for steam injection profiles in steam injection wells is disclosed. Radiation decay data is collected at two detectors at...
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5049743 |
Surface located isotope tracer injection apparatus
The present disclosure is directed to a method and apparatus for controllably injection a radioactive isotope tracer fluid into a fracture fluid, a manifold or mud flow line connected to a well. It...
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5047632 |
Method for determining dynamic flow characteristics of multiphase flows
A method for determining at least one dynamic flow characteristic of a multiphase flow circulating in a pipe, the flow being composed of a lighter dispersed-phase and a heavier continuous-phase. A...
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5045692 |
Simultaneous fluid flow and fluid density measurements using rotameter and nuclear technology
A fluid flow and simultaneous fluid density measuring device is set forth. The preferred embodiment incorporates a sonde having a lower inlet port, an upper outlet port, a lengthwise tube extending...
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5023819 |
Linear shaped filter
A filter for use with a signal which varies about a mean such as in a radioactive densometer, is provided and includes a microprocessor and timing clock for sampling the random variable over a...
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5005422 |
Method and apparatus for measuring subsidence
The present invention relates to a method and apparatus for measuring subsidence by evaluating the distance between radioactive markers which have previously been implanted in the formation...
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5001342 |
Radioactive tracer cement thickness measurement
A process for measuring the thickness of the cement surrounding a casing in a borehole wherein a radioactive tracer is mixed with the cement and the response is monitored to determine the cement...
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4939361 |
Method for correcting gamma ray spectra for borehole tracer interference
Techniques are shown for determining the distribution of plural tracer isotopes located inside and outside a cased well borehole. Standard gamma ray spectra of plural tracer isotopes taken inside...
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4926940 |
Method for monitoring the hydraulic fracturing of a subsurface formation
A method for monitoring the hydraulic fracturing of a subsurface formation. The formation is fractured with a fracturing fluid or a proppant containing a characteristic element of the formation...
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4916312 |
Device for placing a radioactive source in a formation through which a borehole passes
The present invention relates to a device for placing a radioactive source into a formation through which a borehole passes. The device includes a gun barrel, a bullet containing a radioactive...
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4877956 |
Closed feedback injection system for radioactive materials using a high pressure radioactive slurry injector
A closed feedback control system for injecting radioactive material into a high pressure well stimulation fluid line is provided which allows the injection rate to be controlled based upon desired...
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4876449 |
Reservoir evaluation using partitioning tracer
Reservoir information for determining residual oil saturation is obtained by injection of a partitioning tracer and a non-partitioning material through an injection well and periodically logging a...
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4864128 |
Method of introducing a radioactive substance into a well
A method of introducing a radioactive substance into a well using a reusable radioactive material shipping container. The container for holding the radioactive substance to be injected directly...
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4861986 |
Tracer injection method
A tracer injection method is set forth and is practiced by using spaced end located injectors on a sonde having spaced detectors along the length of the sonde. The injectors inject radioactive...
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4857729 |
Method of radioactive well logging
A method of radioactive well logging for use in well operations wherein hydraulic fracturing material, including radioactive isotopes, is injected from a steel-cased well bore 31 into surrounding...
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4857728 |
Method and apparatus for reducing radioactive hazards in well boreholes
In logging operations in a well borehole where difficulties arise in retrieval of the logging apparatus, drilling through the logging tool is sometimes necessary. This disclosure sets forth a...
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4857234 |
Method for making a partitioning radioactive tracer
A partitioning radioactive tracer material is prepared by reacting an alkali-metal salt of radioactive iodine with chloroethanol in the presence of activated carbon.
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4825073 |
Method for determining depth of penetration of radioactive tracers in formation fractures
A method for determining the mean depth of penetration of one or more radioactive tracers injected by a hydraulic fracturing process into a fractured formation disposed about a well bore as an...
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4825072 |
Method and apparatus for determining well fluid flow velocity using a nonradioactive tracer
Method of determining the flow velocity of fluid flowing within the borehole of a well, traversing subsurface formations of the earth, with a nonradioactive tracer. A population of neutrons is...
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4799552 |
Method and apparatus for injecting radioactive tagged sand into oil and gas wells
A method and apparatus for injecting radioactive tagged sand into fluids used in hydraulic well fracturing, or acidizing, operations, the fluids being pumped under high pressure into the well bore...
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4786805 |
Reusable radioactive material shipping container including cartridge and injector
A container for holding a radioactive substance to be injected directly into a flow stream includes a cartridge portion, defined by a receptacle member having a cavity in which the substance is to...
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4771635 |
Fluid injector for tracer element well borehole injection
The present disclosure is directed to a tracer fluid injector apparatus adapted to be lowered in a well borehole. In a sonde preferably equipped with a radioactive detector, a fluid injector system...
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4731531 |
Method of logging a well using a non-radioactive material irradiated into an isotope exhibiting a detectable characteristic
A method of logging a well includes the steps of moving a tagging agent into a well so that the tagging agent is deposited in an earthen formation of the well, which tagging agent is...
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4712618 |
Multiple reservoir transportation assembly for radioactive substances, and related method
A transportation assembly includes a single container having a primary confinement receptacle and a secondary confinement receptacle in which the primary confinement receptacle is retained. In the...
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