Abstract: A borehole caliper tool includes a tool body, a bow spring flexibly coupled to the tool body, a target coupled to the bow spring, and an ultrasonic transducer coupled to the tool body, wherein in operation the ultrasonic transducer transmits an acoustic pulse to the target and receives an echo of the acoustic pulse from the target.

Abstract: The invention provides a support for measurement means for monitoring and/or studying a fluid reservoir (13) through which at least one well (11) passes, said support comprising: a cylindrical tube (2); and a jacket (3) surrounding said cylindrical tube. According to the invention, said jacket (3) has at least one recess (4, 5) for receiving means (6) for measuring a characteristic representative of said reservoir and/or connection means (7) leading to power supply and measurement-processing means (16). The invention also provides a measurement device for monitoring and/or studying a fluid reservoir (13) through which at least one well (11) passes, said device comprising: power supply and measurement processing means (16); means (6) for measuring a characteristic representative of said reservoir, and connection means (7) connecting said measurement means (6) to said power supply and measurement processing means (16).

Abstract: A centralizer (1) for position a casing (3) in a conduit (4) passing through underground formations includes measurement means (7) such as an electrode for deriving at least one representative parameter of the formations.

Abstract: An electrical cable for use in a downhole application is provided. The cable includes an elongated support layer and an array of insulated conductors bonded to said elongated support layer. The elongated support layer substantially bears a weight of the conductors.

Abstract: Process for determining the resistivity (Rt) of a formation (9) surrounding a well (10) equipped with a casing (11) consisting of several casing segments (11.i, 11.

Abstract: A method of producing images of formations surrounding a borehole, comprises: obtaining values of a first parameter in the borehole as a function of depth and azimuth at a first resolution; obtaining values of a second parameter in the borehole as a function of depth only at a second resolution; establishing a relationship between the first and second parameters at a matched resolution; using the relationship to derive values of the second parameter as a function of depth and azimuth; and producing an image of the second parameter as a function of depth and azimuth using the derived values of the second parameter.

Abstract: A method of determining the depth of equipment in an underground borehole, the equipment being suspended in the borehole by means of a cable extending from the surface into the well, comprises: (i) determining the amount of cable introduced into the well at the surface; (ii) dividing the cable in the borehole into a series of elements; (iii) determining the tension in each element of the cable in the borehole; (iv) determining the stretch of the cable in the borehole for the determined tension in all elements; and (v) determining the depth of the equipment from the determined amount of cable introduced into the well from the surface and from the determined stretch of the cable in the borehole. The method can be used for correcting a depth measurement or determining an error in a depth measurement made on the cable at the surface by determining a correction factor using the methodology described above.

Abstract: Resonant sensor with optical excitation and monitoring device using this sensor. This sensor comprises a doped silicon resonator (4) to absorb radiation (Re) with wavelength longer than 1100 nm and may be used for example to monitor the pressure in an oil well.

Abstract: The invention relates to a method of sampling a fluid phase in a multiphase fluid mixture flowing in a pipe (7) under given pressure conditions (P), said method comprising the following steps; admitting the multiphase fluid mixture into a phase separator (9); separating the multiphase fluid mixture so as to isolate the fluid phase for sampling; pressurizing a sampling device (10) to the given pressure in the pipe (7); and recovering a sample of said fluid phase in said sampling device. According to the invention, the method further comprises a step of increasing the pressure in the phase separator (9) in successive stage until said pressure in the separator reaches the give pressure (P) in the pipe (7).

Abstract: A system and methods for indicating formation resistivity anisotropy and evaluating the vertical resistivity component by combining array induction measurements and array laterolog measurements. Formation measurements are obtained with an induction tool and a laterolog tool. Formation parameter data are derived from the induction tool measurements. The laterolog tool response is modeled using the derived formation parameter data. The formation resistivity anisotropy and/or the vertical resistivity component are determined from a comparison of the modeled laterolog tool response against the apparent measurements obtained with the laterolog tool.

Abstract: The invention provides techniques for calculating velocity from sonic signals with an improved signal to noise ratio, accuracy and certainty of result. Multichannel coherence measures are calculated from sonic transmitter signals and averaged to produce an average coherence measure. The formation slowness is determined from the averaged coherence measure.

Abstract: Process for the location of the position of the interface (5) between two fluids (f1, f2) each contained in a zone (7-1, 7-2) of a reservoir (4) in which: a) a reference transient flow condition that produces a reference pressure difference (?Pref(t)), is initiated in a reservoir (4) that comprises at least one pressure sensor (8) located within one of the zones (Z1), b) later an effective transient flow condition that produces a pressure wave which propagates within the reservoir (4) producing an effective pressure difference (?Pu1?(t)) is initiated, c) the pressure differences (?Pref(t)), (?Pu1(t)) are compared, d) a point in time (?1) that represents the instant when the pressure wave reaches the interface (5) between the two fluids (f1, f2) is determined, the distance (L1) between the interface (5) and the pressure sensor (8) is calculated. The operations b) to d) are repeated in order to monitor movement of the boundary. Application in the petroleum industry.

Abstract: The present invention relates to the processes and devices for assessing the permeability of a rock medium 1 containing a fluid 2 in its interstices 3. The device and the process according to the invention are characterized essentially in that a given magnetic field is applied to the interstitial fluid 2 located in the rock medium 1, the variation in pressure of the interstitial fluid 2 resulting from the application of the magnetic field is measured, and the permeability of the rock medium is determined as a function of the value of the variation in pressure of the interstitial fluid.

Abstract: Systems and methods utilizing an elongated sub body adapted to receive a run-in tool within its inner bore. The run-in tool including nuclear sources and sensors to provide nuclear formation evaluation while tripping. The nuclear sources and sensors align with partially or fully penetrating windows in the sub to allow for measurements through the sub. The sub wall includes an inner passage adapted to direct radiation energy emitted from within the sub back to the sub bore to align the run-in tool within the sub. The sub also includes fully penetrating openings in its walls to provide through-tubular signal passage. Hydraulic isolation at the sub openings is provided by pressure barrier means. A run-in tool configuration also includes antennas, neutron, and gamma-ray sources/sensors to provide a retrievable triple combo system.

Abstract: An insert device for narrowing a throat of a Venturi based multiphase flow meter is shaped to be inserted in the throat. The insert comprises an entrance window and an exit window for a radiation beam generated at a periphery of the throat. The insert allows pressure takeoff to be made in a conventional way. Several examples of insert device are described including a rod, a tubular and a tuning fork insert.

Abstract: A method and apparatus are disclosed for determining a time to failure for an electronic device. The method and apparatus includes estimating a dependency of a bond strength degradation rate on at least one parameter and estimating a temperature profile of the electronic device. Furthermore, the method and apparatus determine a bond strength based on the dependency of the bond strength degradation rate and the temperature profile, and determine the time to failure for the electronic device based on a time evolution of the bond strength.

Abstract: Methods of treatment of fluids produced by an oil or gas well following a stimulation operation, allowing separation from the fluids and re-injection of oil and gas hydrocarbons in a production pipeline under pressure, and allowing achievement of suitable quality for the residual fluids compatible with their rejection, for example into the sea, including the following three elements; neutralization of the fluids by mixing with a high pH chemical, until the resulting pH reaches a level compatible with the equipment and pipes; use of optimized emulsion breakers in a phase separator, selected for best results with the fluids produced by the well, to accelerate the separation of oil from the fluids, and to lower the residual oil content in the fluids to levels compatible with environmental regulations; and use of a multi-phase pump to pump the oil and gas hydrocarbons produced and reinject them in a pipeline under pressure.

Abstract: Systems and techniques for cooling a component within a housing using a composition of heat pipes. The housing contains a first heat pipe having a condenser section and an evaporator section; a plurality of secondary heat pipes, each having condenser and an evaporator sections, disposed in parallel within the housing with the evaporator sections of the secondary pipes near the condenser section of the first heat pipe; wherein the plurality of secondary heat pipes are adapted to absorb heat rejected from the condenser section of the first heat pipe for distribution from the condenser sections of the secondary heat pipes. A cooling method entails disposing the primary and secondary heat pipes within the housing; adapting the secondary pipes to absorb heat rejected from the primary pipe; and distributing the heat absorbed by the secondary heat pipes toward an end of the housing.

Abstract: Systems and methods for downhole communication and measurement utilizing an improved metallic tubular having an elongated body with tubular walls and a central bore adapted to receive a run-in tool. The tubular including slotted stations to provide through-tubular signal transmission and/or reception. Hydraulic isolation between the interior and exterior of the tubular is provided by pressure barrier means at the slotted stations. Sensors and/or sources are mounted on the run-in tool, which is adapted for transmission through a drill string to engage within the tubular in alignment with the slotted stations. A run-in tool configuration includes a modulator for real-time wireless communication with the surface and/or remote downhole tools. A tubular and run-in tool configuration also includes inductive couplers for wireless signal data transfer. A method for measuring a formation characteristic utilizing a run-in tool adapted with an interchangeable end segment for multi-mode downhole transport.

Abstract: A microelectronic pressure sensor comprises a resonator (23) made on the basis of a crystalline material and secured to the inside of a package (24) made use of a cap (27) and a baseplate (26) for assembling one to the other. The cap (27) and the baseplate (26) are made completely or almost completely out of the same material as the resonator (23), and the pressure (Pe) to be detected is applied all around the package.