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| Number | Title | Issue Date |
| 8057752 | Fluid analyzer for determining fluid chemistry of formation fluid by downhole reagent injection spectral analysis A method for analyzing formation fluid in earth formation surrounding a borehole includes storing analytical reagent in a reagent container in a fluids analyzer in a formation tester and moving the formation tester, including the reagent, downhole. Reagent from the ... | 11/15/2011 |
| 8055026 | Image feature extraction A method of extracting desired features from a cellular image including the steps of: (a) selecting an initial cell within the image; (b) selecting an additional cell, near the initial cell, appearing to be associated with a desired feature; (c) repeating step (b) f... | 11/08/2011 |
| 8009059 | Downhole power generation and communications apparatus and method Apparatuses and methods to power and communicate with downhole sensors are presented. Preferred embodiments of the present invention includes energizing a downhole sensor with a surface pressure wave generator and a downhole mechanical to electrical energy converter... | 08/30/2011 |
| 7994932 | Borehole telemetry system An acoustic telemetry apparatus and method for communicating encoded digital data from a down-hole location through a borehole to the surface is described including an acoustic channel terminated at a down-hole end by a reflecting terminal (133, 134), an acou... | 08/09/2011 |
| 7993604 | Spectroscopic pH measurement using optimized mixtures of reagents to extend measurement range An indicator mixture that allows pH measurement over a broader range of pH or to a higher accuracy than available using conventional spectroscopic techniques. In particular, the mixture of the present invention is comprised of two or more reagents such that when com... | 08/09/2011 |
| 7990282 | Borehole telemetry system An acoustic telemetry apparatus and methods for communicating digital data from a down-hole location through a borehole to the surface or between locations within the borehole are described including a receiver and a transmitter linked by an acoustic channel (210... | 08/02/2011 |
| 7984771 | Methods and apparatus for attenuating drillstring vibrations Apparatus and methods are described for highly attenuating vibrations of a drillstring assembly while drilling. In one embodiment, vibrations are attenuated by introducing one or more vibration attenuation modules at appropriate assembly locations. For example, vibr... | 07/26/2011 |
| 7901555 | Electro-chemical sensor An electro-chemical sensor is described having two molecular redox systems sensitive to the same species and having an detector to detect relative shifts in the voltammograms of the two redox systems. ... | 03/08/2011 |
| 7894891 | Diffusion-based magnetic resonance methods for characterizing bone structure A method of in vitro or in vivo nuclear magnetic resonance and/or magnetic resonance imaging, to determine bone properties by measuring the effects of molecular diffusion inside the bone specimen to derive parameters that are related to the structure of the trabecul... | 02/22/2011 |
| 7886825 | Formation fluid sampling tools and methods utilizing chemical heating A formation fluid sampling tool is provided with reactants which are carried downhole and which are combined in order to generate heat energy which is applied to the formation adjacent the borehole. By applying heat energy to the formation, the formation fluids are ... | 02/15/2011 |
| 7858563 | Wellbore treatment with hydrocarbon-responsive fluid containing oligomeric viscoelastic surfactant A treatment of a subterranean formation which contains a hydrocarbon-bearing zone, is carried out using a hydrocarbon-responsive fluid thickened with an oligomeric surfactant consisting of from 2 to 8_linked surfactant monomer subunits. The process of treatment comp... | 12/28/2010 |
| 7858562 | Powder composition A powder composition comprising viscoelastic surfactant forms, in aqueous solution, a viscoelastic wellbore treatment fluid. ... | 12/28/2010 |
| 7857049 | System and method for operational management of a guarded probe for formation fluid sampling Embodiments of the present invention relate to systems and methods for real-time management of a guarded probe device down a wellbore that is being used for formation fluid sampling. More specifically, but not by way of limitation, embodiments of the present inventi... | 12/28/2010 |
| 7852077 | Nuclear magnetic resonance measurement techniques in non-uniform fields Methods and pulse sequences for facilitating nuclear magnetic resonance (NMR) measurements in grossly inhomogeneous fields. Methods and pulse sequences according to the invention may be used to accurately measure variables such as transverse relaxation time, longitu... | 12/14/2010 |
| 7810559 | Wellbore consolidating tool for rotary drilling applications A subpart of a drill string is described having an outer circumferential surface which is contoured and adapted to engage the wall of the borehole with a small angle of attack while exerting during rotary drilling operations an compacting pressure on mud cake and/or... | 10/12/2010 |
| 7799278 | Microfluidic system for chemical analysis A microfluidic system for performing fluid analysis is described having: (a) a submersible housing having a fluid analysis means and a power supply to provide power to said system; and (b) a substrate for receiving a fluid sample, having embedded therein a fluid sam... | 09/21/2010 |
| 7767461 | Apparatus and method for measuring concentrations of scale-forming ions This invention relates to methods and apparatus for determination of ion concentrations, particularly in downhole water from hydrocarbon wells, aquifers etc. It is useful in a wide range of applications, including predicting the formation of scale and fingerprinting... | 08/03/2010 |
| 7758734 | Methods and apparatus for the measurement of hydrogen sulphide and thiols in fluids An electrochemical sensor for measuring the amount of hydrogen sulphide or thiols in a fluid in a wellbore comprises a temperature- and pressure-resistant housing containing a flow path for the fluids. The fluids flow over one side of a gas permeable membrane made o... | 07/20/2010 |
| 7729860 | Drilling system powered by energy-harvesting sensor A method and system is provided for determining the value of an attribute of ambient energy at a drilling assembly at the bottom of a borehole. Ambient energy includes kinetic energy, hydraulic energy and thermal energy. Attributes include vibration frequency spectr... | 06/01/2010 |
| 7726017 | Method of fabricating an electrical feedthru A method and apparatus for electrically interfacing between two or more distinct environments. The method and apparatus are directed to an electrical feedthru with exterior traces traversing a core. The electrical feedthru may be very small, facilitating its use in ... | 06/01/2010 |
| 7718434 | Method for determining the characteristics of crude oils and mixtures of chain molecules by diffusion and relaxation measurements The diffusion coefficients and relaxation times of mixtures of alkanes follow simple scaling laws based on the chain length of the constituents and the mean chain length of the mixture. These scaling laws are used to determine chain sizes in a mixture from the distr... | 05/18/2010 |
| 7717000 | Isokinetic sampling A method of sampling a multi-phase fluid stream is provided which comprises the steps of: sampling, with a sampling probe, a portion of the fluid stream; measuring the flow rate of said sampled portion; and measuring, independently of the sampling step, the total fl... | 05/18/2010 |
| 7715984 | Method for continuous interpretation of monitoring data It is shown that a pressure pulse originating in a well is correlated to a pulse observed at a distant well with a characteristic time. The correlation time is directly related to the diffusion time scale arising out of the pressure diffusion equation. The relations... | 05/11/2010 |
| 7710821 | Multiple attenuation method A method is described for reducing multiples in marine seismic data using at least two sets of signals representing seismic energy reflected and/or refracted from an earth structure using a plurality of seismic receivers located in a body of water with the two sets ... | 05/04/2010 |
| 7710000 | Erosion and wear resistant sonoelectrochemical probe The present invention, in one set of embodiments, provides methods and systems for integrating conducting diamond electrodes into a high power acoustic resonator. More specifically, but not by way of limitation, in certain embodiments of the present invention, diamo... | 05/04/2010 |
| 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 analyzer (CFA™) module to detect variations in fluid properties (g... | 04/27/2010 |
| 7704926 | Viscoelastic compositions The present invention provides aqueous viscoelastic compositions comprising a cleavable surfactant and possibly also an electrolyte. The cleavable surfactants useful in the present invention comprise at least one weak chemical bond, which is capable of being broken ... | 04/27/2010 |
| 7684929 | Geometrical optimization of multi-well trajectories A novel method is presented to automatically design a multi-well development plan given a set of previously interpreted subsurface targets. This method identifies the optimal plan by minimizing the total cost as a function of existing and required new platforms, the... | 03/23/2010 |
| 7675252 | Methods of constructing a betatron vacuum chamber and injector A betatron structure having a donut-shaped vacuum chamber, wherein the vacuum chamber is made up of two or more pieces bonded together; an injector positioned within the vacuum chamber; and two or more magnets positioned to the outside of the vacuum chamber. A metho... | 03/09/2010 |
| 7674624 | Method for real-time determination of volume fractions of a production fluid in a hydrocarbon reservoir A preferred method for determining the flow fraction of a mixture of water, gas and oil in a hydrocarbon reservoir includes measuring pressure and density of the mixture over time, determining a function which approximates a relationship between the density and pres... | 03/09/2010 |
| 7670995 | Viscoelastic wellbore treatment fluid A viscoelastic wellbore treatment fluid comprises an effective amount of an oligomeric surfactant for controlling the viscoelasticity of the fluid. ... | 03/02/2010 |
| 7669653 | System and method for maintaining zonal isolation in a wellbore The invention concerns a system or a method for maintaining zonal isolation in a wellbore. According to the invention, the system comprises, at a specific location along said wellbore, a sealing element, said sealing element being able to deform both during and afte... | 03/02/2010 |
| 7665538 | Swellable polymeric materials A seal comprising a polymeric material having a first swelling phase having a first swelling characteristic and a second swelling phase having a second swelling characteristic, the first swelling characteristic is greater than the second swelling characteristic is u... | 02/23/2010 |
| 7655604 | Process of hydraulic fracturing using a viscoelastic wellbore fluid Hydraulic fracturing of a subterranean hydrocarbon reservoir is carried out using an aqueous wellbore fluid which is an aqueous solution of a surfactant which has the formula (R1—X)nZ, where R1 is an aliphatic group comprising a C | 02/02/2010 |
| 7642785 | Method and device for complex permittivity measurements as a function of frequency An apparatus for use in a system that includes a network analyzer for determining a property, such as dielectric permittivity of a sample material as a function of frequency, the apparatus including: a cylindrical chamber for receiving the sample; a coaxial connecto... | 01/05/2010 |
| 7632323 | Reducing abrasive wear in abrasion resistant coatings An abrasion resistant coating and method are provided wherein the abrasion resistant coating contains both ductile and brittle components. The abrasion resistant coating is initially applied to a substrate and is further conditioned such that the wear which occurs a... | 12/15/2009 |
| 7630517 | Computer-based generation and validation of training images for multipoint geostatistical analysis A computer-implemented method is provided that automatically characterizes and verifies stationarity of a training image for use in multipoint geostatistical analysis. The stationarity is preferably characterized by statistical measures of orientation stationarity, ... | 12/08/2009 |
| 7623412 | Anisotropy measurement while drilling Methods and apparatus facilitating measurement of anisotropy are disclosed. According to some aspects, anisotropy can be determined while drilling. Monopole/quadrupole interactions, as well as monitoring dipole excitations and other methods, may be used to find the ... | 11/24/2009 |
| 7622919 | Nuclear magnetic resonance measurement techniques in non-uniform fields Methods and pulse sequences for facilitating nuclear magnetic resonance (NMR) measurements in grossly inhomogeneous fields. Methods and pulse sequences according to the invention may be used to accurately measure variables such as transverse relaxation time, longitu... | 11/24/2009 |
| 7622430 | Delayed-gelation solution The invention concerns an aqueous delayed-gelation solution for use in hydrocarbon wells. According to the invention, the aqueous delayed-gelation solution a dissolved metal salt which, in use, hydrolyses to form a gel, wherein the solution contains suspended inorga... | 11/24/2009 |
