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| Number | Title | Issue Date |
| 7360412 | Single point and fiber optic temperature measurement for correction of a gas column weight in a well Fluid column weight correction using discrete point and fiber optic temperature measurement. A method for determining pressure at a distal end of a fluid column in a well includes the steps of: dividing the fluid column into multiple segments; determining a temperat... | 04/22/2008 |
| 7317989 | Method and apparatus for chemometric estimations of fluid density, viscosity, dielectric constant, and resistivity from mechanical resonator data The present invention provides a chemometric equation to estimate fluid density, viscosity, dielectric constant and resistivity for a formation fluid sample downhole. The chemometric estimates can be used directly as estimated values for fluid density, viscosity, di... | 01/08/2008 |
| 7290601 | Braided thermocouple cable bundle A product consisting of a plurality of thermocouple cables braided or wound and covered with protective armour, thereby forming a braided bundle. The product is used in accordance with a method involving a further step of inserting the braided bundle into a well. | 11/06/2007 |
| 7266983 | Methods to detect formation pressure A method of determining a formation pressure during drawdown of a formation comprises sampling fluid from a formation using a downhole tool. A fluid sample pressure is determined at two different times during the drawdown. The fluid sample pressures are analyzed usi... | 09/11/2007 |
| 7240537 | Method for the determination of the wall friction profile along pipes by pressure transients measurements The present invention deals with a method which allows to determine the wall friction profile along pipes transporting liquids, particularly petroleum industry liquids, by measuring the pressure transients induced by fast changes in the flow rate. This method is app... | 07/10/2007 |
| 7234521 | Method and apparatus for pumping quality control through formation rate analysis techniques The present invention provides a method and apparatus for determination of the quality of a formation fluid sample including monitoring permeability and mobililty versus time to determine a filtrate contamination level, single phase state without gas and solids in t... | 06/26/2007 |
| 7231819 | Chemical sensor for wellbore applications There is described an analyzing device having two separation units to separate molecular species to detect molecular species in wellbore fluids with both separation units operating under forced flow conditions to provide for an active separation of subterranean well... | 06/19/2007 |
| 7231818 | Determining horizontal and vertical permeabilities by analyzing two pretests in a horizontal well In one method, the permeabilities are obtained by correcting the geometric factor derived from combining the FRA analysis and buildup analysis. In a second method, the permeabilities are obtained by combining the spherical permeability estimated from buildup analysi... | 06/19/2007 |
| 7228512 | Method of generating capacitance value rule table for extraction of wiring capacitance and capacitance value rule table generation program A method and computer program for generating a capacitance value rule table, which simplifies generation of the capacitance value rule table for multilayer wiring having a complex dielectric constant structure are provided. In the method, construction data of wire a... | 06/05/2007 |
| 7222671 | Apparatus and method for formation evaluation A viscometer for a down hole tool positionable in a well bore penetrating a subterranean formation is described. The formation contains at least one fluid therein. The down hole tool is adapted to convey at least a portion of the fluid to the viscometer. The viscome... | 05/29/2007 |
| 7219747 | Providing a local response to a local condition in an oil well A method and apparatus for providing a local response to a local condition in an oil well are disclosed. A sensor is provided to detect a local condition in a drill string. A controllable element is provided to modulate energy in the drill string. A controller is co... | 05/22/2007 |
| 7216533 | Methods for using a formation tester A method of testing a downhole formation using a formation tester on a drill string. The formation tester is disposed downhole on a drill string and a formation test is performed by forming a seal between a formation probe assembly and the formation. A drawdown pist... | 05/15/2007 |
| 7210344 | Method for measuring formation properties with a time-limited formation test An apparatus and method for determining at least one downhole formation property is disclosed. The apparatus includes a probe and a pretest piston positionable in fluid communication with the formation, and a series of flowlines pressure gauges, and valves configure... | 05/01/2007 |
| 7205762 | Downhole high resolution NMR spectroscopy with polarization enhancement An apparatus and method is discussed for characterizing a fluid sample downhole of aliphatic hydrocarbon compounds, aromatic hydrocarbon compound, or connate mud filtrates containing carbon-13 isotopes using an enhanced nuclear magnetic resonance (NMR) signal on a m... | 04/17/2007 |
| 7201226 | Downhole measurement system and method A system and method measures a pressure or other measurement at a source (e.g. a hydraulic power supply) and in or near a downhole tool and compares the measurements to verify that, for example, the supply is reaching the tool. The system and method also may utilize... | 04/10/2007 |
| 7187784 | Borescope for drilled shaft inspection Visual inspection of an interior surface of a borehole. A housing adapted to be lowered in the borehole supports a portable camera for generating images of a portion of the interior surface of the borehole and a light source for illuminating an area adjacent the cam... | 03/06/2007 |
| 7183779 | Soil probe device and method of making same A device for measuring one or more different properties of soil or a soil-related substance is provided. The device includes a probe that is inserted into the soil or soil-related substance. The probe includes a tip. The tip is electrically insulative and defines ap... | 02/27/2007 |
| 7184895 | Method and system of non-intrusively monitoring the mixture ratio of a gas mixture having at least two components A method and system of non-intrusively monitoring the proportion of a component in a gaseous mixture having at least two components and contained in an electrical switchgear enclosure includes measuring the pressure, the temperature, and the density of the gas mixtu... | 02/27/2007 |
| 7181960 | Determination of correct horizontal and vertical permeabilities in a deviated well In one method, the permeabilities are obtained by correcting the geometric factor derived from combining the FRA analysis and buildup analysis. In a second method, the permeabilities are obtained by combining the spherical permeability estimated from buildup analysi... | 02/27/2007 |
| 7178607 | While drilling system and method A while drilling system and method for determining annular pressure while drilling is provided. The system is positioned in a drilling tool suspended from a drilling rig via a drill string. The system includes at least one drill collar, a while drilling tool and at ... | 02/20/2007 |
| 7178608 | While drilling system and method A while drilling system and method for determining downhole parameters is provided. The system includes a retrievable while drilling tool positionable in a downhole drilling tool, a sensor chassis and at least one sensor. The while drilling tool is positionable in t... | 02/20/2007 |
| 7171851 | Temperature compensated strain measurement The present invention provides methods and apparatus for measuring subterranean strain. The methods and apparatus use fluid expansion principles to compensate for temperature variations and increase the accuracy of the strain measurements. The methods and apparatus ... | 02/06/2007 |
| 7134493 | Logging system for use in a wellbore A logging system that may be used in a wellbore formed in an earth. A tubular conduit extends from surface into the wellbore and contains a body of wellbore fluid. A logging tool string may be passed from a position within the conduit to a position outside the condu... | 11/14/2006 |
| 7126332 | Downhole high resolution NMR spectroscopy with polarization enhancement An apparatus and method is discussed for characterizing a fluid sample downhole of aliphatic hydrocarbon compounds, aromatic hydrocarbon compound, or connate mud filtrates containing carbon-13 isotopes using an enhanced nuclear magnetic resonance (NMR) signal on a m... | 10/24/2006 |
| 7117734 | Method for measuring formation properties with a time-limited formation test An apparatus and method for determining at least one downhole formation property is disclosed. The apparatus includes a probe and a pretest piston positionable in fluid communication with the formation, and a series of flowlines pressure gauges, and valves configure... | 10/10/2006 |
| 7086484 | Determination of thermal properties of a formation The present invention relates to methods and apparatus for making in situ thermal property determinations utilizing a heat source employed in wellbore stabilization procedures, well drilling, or well perforating, for example. In particular, using a heat source, such... | 08/08/2006 |
| 7080699 | Wellbore communication system A gap collar for an electromagnetic communication unit of a downhole tool positioned in a wellbore is provided. The downhole tool communicates with a surface unit via an electromagnetic field generated by the electromagnetic communication unit. The gap collar includ... | 07/25/2006 |
| 7046165 | Method for collecting geological data ahead of a drill bit A casing sensor and methods for sensing using a casing sensor are disclosed. The casing sensor includes a casing shoe and a sensor coupled to the casing shoe. A casing data relay includes a downhole receiver coupled to a well casing and a transmitter coupled to the ... | 05/16/2006 |
| 7040156 | Flexible membrane encapsulated strain measurement instrument and method of manufacture A flexible membrane for use in test cells includes instrumentation within the thickness of the membrane to accurately measure a property of a material including stresses, strains, deformation, temperature, moisture potential and moisture content of the sample. A tes... | 05/09/2006 |
| 7042802 | Determination of stress characteristics of earth formations A method for determining the maximum and minimum horizontal stresses of formations surrounding a borehole includes the following steps: suspending a logging device in the borehole; transmitting sonic energy from the logging device to establish flexural waves in the ... | 05/09/2006 |
| 7021148 | Apparatus and method for sealing pressure sensor membranes The present invention lessens the amount of air entering between mating membranes of a pressure sensor. The pressure sensor of the present invention includes a transducer portion and separate patient or medical fluid transfer portion or dome. The transducer portion ... | 04/04/2006 |
| 7011155 | Formation testing apparatus and method for optimizing draw down A method and apparatus for of determining a formation parameter of interest. The method includes placing a tool into communication with the formation to test the formation, determining a first formation characteristic during a first test portion, initiating a second... | 03/14/2006 |
| 6997055 | System and method for determining formation fluid parameters using refractive index A method and apparatus is described for determining a parameter of interest of a formation fluid. The method comprises moving a tool attached to a tubular member along a borehole in a subterranean formation. The tool is used to determine the refractive index, pressu... | 02/14/2006 |
| 6993963 | Method for determining pressure profiles in wellbores, flowlines and pipelines, and use of such method Method for determining pressure profiles in wellbores, flowlines and pipelines flowing singlephase and multiphase fluids and use of such a method. The flow is temporarily stopped or restricted with a quick acting valve and the pressure is continuously recorded at a ... | 02/07/2006 |
| 6978672 | Wireline apparatus for measuring steaming potentials and determining earth formation characteristics Earth formations are characterized by using an array of electrodes which can measure streaming potentials in the formation, and by interpreting the data obtained by the electrodes. The electrodes are placed on a wireline tool, a LWD tool, or in a fixed manner about ... | 12/27/2005 |
| 6964301 | Method and apparatus for subsurface fluid sampling The apparatuses and methods herein relate to techniques for extracting fluid from a subsurface formation. A downhole sampling tool is provided with a probe having an internal wall capable of selectively diverting virgin fluids into virgin flow channels for sampling,... | 11/15/2005 |
| 6959762 | Method and apparatus for formation damage removal A method for evaluating the permeability and formation damage in the porous rock around a well bore. This method relates to the use of a single string coiled tubing and a down hole assembly which includes a microcontroller, an electrically operable fluid control val... | 11/01/2005 |
| 6957576 | Subterranean well pressure and temperature measurement A well pressure and temperature measurement system and method are provided. In a described embodiment, a sensor system includes multiple strain sensors attached to a structure which changes dimensionally in response to well pressure and temperature changes. The stra... | 10/25/2005 |
| 6957577 | Down-hole pressure monitoring system A non-electric down-hole formation pressure monitoring system utilizing a typical down-hole chemical injection system for pressure data acquisition used with surface computer integration to produce an accurate picture of formation pressure variations utilizing press... | 10/25/2005 |
| 6941804 | Determining the PVT properties of a hydrocarbon reservoir fluid A method of determining an in situ PVT property of a hydrocarbon reservoir fluid that is present in a hydrocarbon-bearing formation layer traversed by a borehole, which method involves the steps of: a) calculating along the hydroca... | 09/13/2005 |
