Abstract: A hardband wear testing system with a first rotatable member connected to a tool joint to rotate the tool joint in a first direction. A second rotatable member connectable to the casing sample to rotate the casing sample in the first direction or in a second direction opposite to the first direction. One or more actuators may be utilized to raise and lower the second rotatable member and the casing sample with respect to the tool joint.

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: Apparatus for monitoring an underground formation through which a borehole passes, comprises a conductive casing (6) located in the borehole (1) passing through the formation (4); a plurality of sensors (12-1) for measuring an electrical property of the formation (4) located in the borehole (1) outside the casing (6) and electrically insulated therefrom; and an electrical current source (11) positioned in the borehole (1) passing through the formation (4) and arranged to inject a current into the formation (4); the casing (6) having an electrically insulating coating (14) over the surface thereof, at least in the region of the sensors (12-1), and an electrically conductive portion (11) in electrical contact with the formation (4); and a current supply (10) being connected to the casing (6) such that current flows into the formation (4) from the electrically conductive portion (11) which acts as the current source, the sensors (12-1) measuring the electrical property of the formation (4) resulting from such cu

Abstract: An apparatus for determining fluid-pressure diffusivity in a borehole (12) in a formation (10) includes an electrode (16) and a strain measuring device (18),(20) (or a particle velocity measuring device (18),(20) or a particle acceleration measuring device (18),(20)) disposed a fixed distance from the electrode (16). The electrode (16) injects an electrical current into a point on a wall of the borehole (12). The strain measuring device (18),(20) measures strain (or the particle velocity measuring device (18),(20) measuresd particle velocity or the particle acceleration measuring device (18),(20) measures particle acceleration) at the fixed distance from the point of injection of the electrical current over time. The fluid-pressure diffusivity is determined based on the measured strain (or measured particle velocity or measured particle acceleration) over time.

Abstract: The invention provides a method for estimating an impedance of a material behind a casing wall, wherein the casing is disposed in a borehole drilled in a geological formation, and wherein a borehole fluid is filling said casing, the material being disposed in an annulus between said casing and said geological formation, said method using a logging tool positionable inside the casing and said method comprising: exciting a first acoustic wave in said casing by insonifying said casing with a first pulse, the first acoustic wave having a first mode that may be one of flexural mode or extensional mode; receiving one or more echoes from said first acoustic wave, and producing a first signal; extracting from said first signal a first equation with two acoustic properties unknowns for respectively said material and said borehole fluid; exciting a second acoustic wave in said casing by insonifying said casing with a second pulse, the second acoustic wave having a thickness mode; receiving one or more echoes from said

Abstract: A sensor for installation in an underground well having a casing or tubing installed therein, the sensor comprising: a sensor body that can be installed in a hole formed in the casing or tubing so as to extend between the inside and outside of the casing or tubing; sensor elements located within the body and capable of sensing properties of an underground formation surrounding the well; and communication elements located within the body and capable of communicating information between the sensor elements and a communication device in the well; wherein the sensor body also includes a portion that can be sealed to the casing or tubing to prevent fluid communication between the inside and the outside of the casing or tubing through the hole when the sensor body is installed therein. The invention also provides systems incorporating such sensors, methods for installing sensors and applications of such systems.

Abstract: A borehole caliper tool includes a tool body and an arm coupled to the tool body. The arm is deflectable relative to the tool body. The caliper tool further includes a cam coupled to the arm such that a position of the cam changes as the arm deflects. The caliper tool further includes a proximity sensor for sensing the position of the cam, wherein the position of the cam provides an indication of the deflection of the arm relative to the tool body.

Abstract: A well (10) for producing water is characterized in that it includes a network of widely spaced electrodes (8) electrically coupled with measurement means (3) or with electric current generation means (1). By utilizing a measurement result, the progression of a salt water front heading for the well (10) may be detected.

Abstract: Methods for evaluating the properties of formations surrounding a borehole, include the steps of measuring electrical properties of the formation from within the borehole; deriving a model of parameters of the formation surrounding the borehole; and estimating the properties of the formation using the model to interpret the measured electrical properties. In one aspect of the invention in which the formation includes a series of distributed beds, each bed having specific properties. Another aspect includes grouping similar beds, assigning one or more properties to all of the beds in a group, and using the assigned properties to estimate the properties of the formation for measurements relating to the beds of that group. Another aspect includes making several different measurements of formation electrical properties and simultaneously estimating the formation properties from the different measurements to provide a joint inversion.

Abstract: A method for electrically investigating a wall of a borehole in a geologic formation including injecting a current into the formation at a first position along the wall and returning the current at a second position along the wall, the formation current having a frequency below about 100 kHz, measuring a voltage in the formation between a third position and a fourth position along the wall, the third and fourth positions being located between the first and second positions, and determining an amplitude of a component of the voltage in phase with the current.

Abstract: To acquire data such as the flow rate of various phases of a fluid flowing in a hydrocarbon well (12) in production, in particular in an inclined or horizontal portion of the well, both the local speed of the fluid and the proportions of the various phases are determined in each of at least two distinct regions of the well that are not in alignment with one another parallel to the axis of the well. The regions in which the measurements are taken are advantageously distributed in a vertical plane containing the axis of the well when the well is inclined or horizontal.

Abstract: Techniques for determining a frequency profile of a quartz crystal in real time. Quartz crystals are subjected to a series of temperature cycles at various temperature rates and the crystal frequencies, crystal temperature parameters, and the temperature rates are monitored as the crystal is subjected to the temperature cycles. The monitored frequencies are grouped correlated with the monitored temperature parameters and temperature rates. A system for determining the frequency of a quartz crystal includes a processor adapted to perform the frequency profiling techniques.

Abstract: The invention concerns a neutron measurement method for determining porosity of an earth formation surrounding a borehole comprising: conveying a tool along said borehole, wherein said tool comprises a source of neutron radiation and at least one detector axially spaced from said source; generating measured detector response for said at least one detector that is indicative of neutron radiation from said source interacting with said earth formations; operating said measured detector response with a predetermined mathematical equation and thereby obtaining corrected detector response that is independent of the density of said earth formation; and determining porosity of the earth formation surrounding the borehole from said corrected detector response. The invention also relates to a system implementing said method.

Abstract: An apparatus for characterizing an effluent formed by a multiphase fluid mixture is described, said apparatus comprising a source emitting gamma rays at a plurality of energy levels through said effluent towards a detector block that takes account of the photons it receives as a consequence thereof to deduce therefrom the attenuation of said rays by said effluent. The detector block includes a filter for selectively detecting the photons it receives at a first energy level and at a second energy level, said first and second levels being predetermined amongst the energy levels of radiation from the source.

Abstract: The invention concerns a method for correction with temperature in the pressure determination of a pressure gauge, comprising: measuring simultaneously with said gauge said pressure Pm(t) and said temperature Tm(t) during time, generating a signal Tf(t) of said measured temperature Tm(t), said measured temperature being filtered of the noise, (19) correcting said measured pressure Pm(t) with a correction function F(t) containing exclusively a dynamic part, said dynamic part containing a term a1 proportional to first derivative of said Tf(t) signal relative to time. In another aspect of the invention the dynamic part further comprises a second additional term a2 proportional to second derivative of said Tf(t) signal relative to time.

Abstract: The invention concerns a method for calculating the relative volumetric flow-rates of at least one of the phases of a multiphase effluent flowing in a well. Firstly, the local volumetric fractions and/or velocities of the phases across a section of the wall at a certain depth is acquired. Then, the local volumetric fraction and/or velocity measurements is/are corrected in order to make them consistent with each other and/or with the effluent flow conditions. Subsequently, selection of a suitable flow model mathematically representing the effluent flow is selected. Then, The local volumetric fraction measurements and/or the local velocity measurements are interpolated by the selected flow model in order to obtain a volumetric fraction profile and/or a velocity profile for at least one phase of the effluent across the section of the well at the depth.

Abstract: The invention relates to apparatus for controlling the flow rate of a fluid in tubing (4), said apparatus (5) comprising at least one hole (7) passing through the wall of said tubing and a moving shutterjacket (8) mounted to engage said hole. According to the invention, said apparatus further comprises deflector means (9) covering said jacket and said hole so that said deflector means directs the fluid through the wall of said tubing.

Abstract: A method for evaluating a natural gamma-ray activity within a borehole, comprises the steps of: stabilizing the gain according to a method for stabilizing a gain of a gamma-ray detector for use in a downhole logging tool; determining an interval count rate, the interval count rate corresponding to gamma-rays having an energy within a predetermined correction interval; calculating a correction count rate from the determined interval count rate; and using the correction count rate to evaluate the natural gamma-ray activity.

Abstract: An apparatus for measuring characteristics of earth formations surrounding a borehole, comprises a resistivity measurement device having a multiplicity of antennae spaced between each other in a longitudinal direction of the apparatus. A neutron measurement device of the apparatus comprises at least a neutron source and at least a neutron detector, each of the neutron detectors being at a distance from the neutron source in the longitudinal direction of the apparatus. The multiplicity of antennae are interleaved with the neutron measurement device in order to reduce a total length of the apparatus and in order to allow a determined area of the earth formation to be measured simultaneously using the neutron measurement device and the resistivity measurement device.