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| Number | Title | Issue Date |
| 7347260 | Method for determining tracer concentration in oil and gas production fluids A method for determining the extent of recovery of materials injected or otherwise introduced into oil wells or subsurface formations is practiced using a portable device. The portable device can also be used to determiner the occurrence of a predetermined condition... | 03/25/2008 |
| 7303006 | Method for improved vertical sweep of oil reservoirs In a WAG flood oil is displaced from a subterranean formation by injecting water alternately with gas into a single injection completion per pattern. The ratio of water to gas injected is the WAG ratio. In this invention, two separate injection completions are used ... | 12/04/2007 |
| 7284604 | Methods for measurement of a dimensional characteristic and methods of predictive modeling related thereto A method of optically determining a change in magnitude of at least one dimensional characteristic of a sample in response to a selected chamber environment. A magnitude of at least one dimension of the at least one sample may be optically determined subsequent to a... | 10/23/2007 |
| 7047830 | Method to detect and characterize contaminants in pipes and ducts with interactive tracers A method and an apparatus for detecting, locating, and quantifying contamination in a fluid flow system like a pipe or duct. This characterization technique uses a conservative and one or more interactive tracers that are injected into the fluid flow system and then... | 05/23/2006 |
| 7032662 | Method for determining the extent of recovery of materials injected into oil wells or subsurface formations during oil and gas exploration and production Disclosed is a method of determining the extent of recovery of materials injected into oil wells or subsurface formations. The method includes injection of one or more tracers into an oil well or into a formation. Included in the method are the steps of introducing ... | 04/25/2006 |
| 6840316 | Tracker injection in a production well A petroleum well having a well casing, a production tubing, a source of time-varying current, a downhole tracer injection device, and a downhole induction choke. The casing extends within a wellbore of the well. The tubing extends within the casing. The current sour... | 01/11/2005 |
| 6581686 | Method of and device for tracing hydraulic fractures, stimulations, cement jobs, etc. in oil and gas wells Tracing hydraulic fractures, stimulations, selective cement jobs, etc. in oil and gas wells includes introducing into a well in a zone of interest a plurality of radio frequency transmitting elements each having an identification, moving in the well a rea... | 06/24/2003 |
| 5212093 | Method to determine drift and residual oil saturation Drift or residual oil saturation within a reservoir around a wellbore is determined by injection of a water-soluble tracer and then producing from the well. This injection is performed twice. The first injection is immediately followed by production in or... | 05/18/1993 |
| 5168927 | Method utilizing spot tracer injection and production induced transport for measurement of residual oil saturation A method is disclosed for providing sharp breakthrough of tracers in a two-well tracer test by injecting a relatively small volume of tracer at a high rate into a temporary injection well, and utilizing the flow induced by producing wells to transport the... | 12/08/1992 |
| 5111882 | Use of tracers to monitor in situ miscibility of solvent in oil reservoirs during EOR A method for monitoring in situ miscibility of a solvent with reservoir oil by using at least two tracers having different boiling points and being miscible with the solvent. The tracers are mixed with the solvent, injected into a well and produced from a... | 05/12/1992 |
| 5095982 | Method of characterizing the flowpath for fluid injected into a subterranean formation The flowpath for fluid injected into a hydrocarbon-containing subterranean formation for displacing hydrocarbons through the formation is determined by injecting a fluid into the formation through a wellbore, producing fluids from the formation through th... | 03/17/1992 |
| 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 different depths. The data is then transformed into a new ... | 12/10/1991 |
| 4958684 | Steam injection profiling An improved method and apparatus for determining injection profiles in a steam injection well is disclosed. The mass flow rate of steam entering the well is measured. A well logging tool is then used to measure temperature and/or pressure profiles within ... | 09/25/1990 |
| 4928522 | Steam injection survey apparatus and method for testing wells A radio-active tracer, carried by a pressurized gas, is injected through an axially displaceable tube into a flow stream of steam within a well tubing string to perform a steam injection survey of underground formations intersected by a well bore into whi... | 05/29/1990 |
| 4817713 | Steam injection profiling An improved method and apparatus for determining injection profiles in a steam injection well is disclosed. The mass flow rate of steam entering the well is measured. A well logging tool is then used to measure temperature and/or pressure profiles within ... | 04/04/1989 |
| 4793414 | Steam injection profiling An improved method and apparatus for determining injection profiles in a steam injection well is disclosed. The mass flow rate and quality of steam entering the well is measured. A well logging tool is then used to measure temperature and/or pressure prof... | 12/27/1988 |
| 4788848 | Chemical tracer determination of steam quality A method and means for determining the quality of steam in a flowing steam line is disclosed. A tracer solution is injected into a steam flow line. The tracer solution contains a liquid tracer that will reside almost entirely in the liquid phase and a vap... | 12/06/1988 |
| 4742873 | Subterranean flood tracer process A method for determining the injection source of an injection fluid which will break through at the production wells of a subterranean flooding project is disclosed in the preferred embodiment. The source of the injection fluid is determined by injecting ... | 05/10/1988 |
| 4501324 | Method for identifying the source of an oil A method for tagging an oil so that subsequently it may be identified as to source by incorporating into the oil as a tracer material a minor amount of certain halohydrocarbons or halocarbons, utilizing the so-tagged oil in any desired manner wherein cont... | 02/26/1985 |
| 4420565 | Method for determining flow patterns in subterranean petroleum and mineral containing formations The method for determining flow patterns within a subterranean formation penetrated by a spaced apart injection system and production system that comprises injecting into the formation at a predetermined depth from the injection system a solution containi... | 12/13/1983 |
| 4303411 | Fluorine-containing tracers for subterranean petroleum and mineral containing formations There is disclosed a method for determining flow patterns within a subterranean formation by injecting as a tracer a water soluble alkaline metal salt of inorganic or organic compounds having fluorine in the anion. The tracer compounds of the invention ar... | 12/01/1981 |
| 4273187 | Petroleum recovery chemical retention prediction technique The amount of a petroleum recovery chemical retained within a subterranean reservoir is predicted by first gathering data from at least one injection-soak-production cycle in a single well wherein the produced fluids are monitored for both the chemical co... | 06/16/1981 |
| 4264329 | Tracing flow of fluids A tracer system is disclosed which is especially useful for following fluid flow in underground reservoirs. Metal chelates, preferably derived from EDTA and containing a functional group which reacts with a fluorogenic agent, are used as tracers. Liquid c... | 04/28/1981 |
| 4231426 | Method of using tracer fluids for enhanced oil recovery Disclosed is a tracer fluid for use in connection with surfactant waterflooding or other chemicalized enhanced oil recovery processes, and an oil recovery process using the fluid. Fluids containing easily identifiable components such as water-soluble, ino... | 11/04/1980 |
| 4055399 | Tracers in predetermined concentration ratios A method for tracing the flow of a plurality of fluid slugs injected into a subsurface formation using a number of tracers smaller than the number of fluid slugs. Single tracers are used in a number of fluid slugs equal to the number of tracers. In the re... | 10/25/1977 |
| 3993131 | Tracing flow of petroleum in underground reservoirs The flow path of petroleum in underground reservoirs is monitored by injecting a stable free radical, or spin label, into the reservoir as a tracer which becomes detectable in a sample taken from a producing well. Detection of the spin label is by electro... | 11/23/1976 |
