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| Number | Title | Issue Date |
| 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. The imaging sensor of the present invention selectively emits and/or... | 05/01/2007 |
| 7075063 | Determining phase transition pressure of downhole retrograde condensate The invention provides a method for determining phase transition pressure of downhole retrograde condensate. An OBM-contamination value is produced from a time-series of fluorescence values produced by measuring fluorescence emitted from a single-phase flow of OBM-c... | 07/11/2006 |
| 6879425 | Device for determining and/or monitoring the density and/or the level of a filling material in a container The invention relates to a device for determining and/or monitoring the density and/or the level (L) of a filling material in a container. A transmitting unit which emits radioactive radiation and a receiving unit which is arranged in such a way that it receives the... | 04/12/2005 |
| 6749715 | System and method for analyzing a semiconductor surface A method and apparatus for analyzing a semiconductor surface obtains a sample from a localized section of a wafer. The sample is obtained by isolating a section of a wafer with a sampling apparatus, dispensing liquid onto the isolated section of the wafer, dissolvin... | 06/15/2004 |
| 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, such as an environmentally rugged cable. Signals are tran... | 07/22/2003 |
| 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 provided a downhole imaging system which operates in a wavelength... | 10/29/2002 |
| 6104033 | Method of determining fluid level and interface in a closed vessel A process and apparatus for determining the levels in a vessel of two or more immiscible or partially-miscible components has been developed. The process begins with transmitting gamma rays, x-rays, microwaves, ultrasound waves, or sonar waves through the... | 08/15/2000 |
| 5578820 | Method for determining cement thickness in a well annulus A method is disclosed for determining the thickness of cement that has been placed in an annulus between a casing string and a wellbore penetrating a formation, wherein the method includes the steps of: logging the amount of radioactivity emitted by a rad... | 11/26/1996 |
| 5361632 | Method and apparatus for determining multiphase holdup fractions using a gradiomanometer and a densitometer A method and apparatus determines three phase holdup fractions and flow rates for the individual phases of a fluid flowing in a well. A logging tool comprising a temperature compensated gradiomanometer having a differential pressure detector comprised of ... | 11/08/1994 |
| 4982086 | Method of porosity determination in porous media by x-ray computed tomography A method for porosity determination in porous media such as earth and rock core samples by x-ray computed tomography in which a sample of the porous medium is scanned after saturation with a first reference fluid and then after saturation with a second re... | 01/01/1991 |
| 4833321 | Process for installing a probe for monitoring the position of an interface between two fluids and means for implementing said process This invention relates to a system for monitoring, in a cavity in the earth, the position of, or changes in the position of, an interface between two immiscible liquids of different densities. In accordance with the invention, two pipes, one positioned wi... | 05/23/1989 |
| 4399359 | Method for monitoring flood front movement during water flooding of subsurface formations A method is disclosed for monitoring the flood front movement during enhanced recovery operations wherein flooding fluids are pumped into a number of injection wells forcing residual oil movement toward a production well. A plurality of monitoring wells l... | 08/16/1983 |
| 4342911 | Focused nuclear interface survey instrument and method of determining density changes in mining and storage wells The instrument and method locate anomalies and the interface between two materials having little difference in their density in a mining or storage well. More particularly, the method comprehends the generation of gamma rays and the detection of scattered... | 08/03/1982 |
| 3993902 | Radioactive logging for determining oil saturation in a reservoir A method is disclosed for determining oil saturation in a petroleum reservoir using logging signals indirectly related to the abundance of carbon nuclei in the reservoir rock. The first step of the invention is to record a log sensitive to the abundance o... | 11/23/1976 |
| 3993904 | Low-cost but accurate radioactive logging for determining water saturations in a reservoir A method is disclosed for determining water saturation in a petroleum reservoir using logging signals indirectly related to the abundance of oxygen nuclei in the reservoir rock. The first step of the invention is to record a log sensitive to the abundance... | 11/23/1976 |
| 3993903 | Low-cost but accurate radioactive logging for determining gas saturation in a reservoir A method is disclosed for determining gas saturation in a petroleum reservoir using logging signals indirectly related to the abundances of oxygen and carbon nuclei in the reservoir rock. The first step of the invention is to record first and second logs ... | 11/23/1976 |
| 3959647 | Gamma-ray measuring method for determining an interface between media The interface between two fluids such as oil and water in an underground cavern may be detected by placing a gelled substance containing a source of gamma radiation at the interface and detecting the emissions from the gelled substance.... | 05/25/1976 |
| 3940612 | Method for detecting and locating water-producing zones and/or water thief zones in subterranean formations A method for locating water-producing zones and/or water thief zones in a subterranean formation penetrated by a well bore comprising the sequential steps of: A. injecting into said formation an aqueous solution containing from about 0.01 to 7.5 weight pe... | 02/24/1976 |
