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| Number | Title | Issue Date |
| 7436185 | Highly integrated logging tool An apparatus for logging a formation traversed by a borehole includes a plurality of logging tools adapted for conveyance inside the borehole. The plurality of logging tools includes a tool body, a sensing pad responsive to a density property of the formation couple... | 10/14/2008 |
| 7350568 | Logging a well A method for logging a well. Includes receiving energy with at least one array of elements coupled to a drill bit, wherein the at least one array of elements functions as an electronic array. An apparatus for logging a well includes a drill bit and at least one arra... | 04/01/2008 |
| 7301345 | While-drilling methodology for estimating formation pressure based upon streaming potential measurements Logging-while-drilling apparatus and methodologies for measuring streaming potential in an earth formation are provided. The apparatus and methodologies can be utilized to find information relevant to the drilling operations. In particular, since the streaming poten... | 11/27/2007 |
| 7256582 | Method and apparatus for improved current focusing in galvanic resistivity measurement tools for wireline and measurement-while-drilling applications A galvanic resistivity tool with one or more measurement electrodes and guard electrodes, and one or more shielding electrodes. The potential difference between the measurement electrodes and the guard electrodes is controlled to minimize current flow between the me... | 08/14/2007 |
| 7151377 | Permanent apparatus for monitoring a well by injecting current through the casing into the formations 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 elec... | 12/19/2006 |
| 7148693 | Process and device for prospecting a porous geological formation A porous geological formation contains electrolytic fluid. During the geophysical prospecting of the formation, a region of interest of the formation where the electrolytic fluid is found is stimulated with an excitation signal. The excitation signal corresponds to ... | 12/12/2006 |
| 7109719 | Method and apparatus for azimuthal resistivity measurements in a borehole An azimuthal resistivity logging tool includes one or more pads for making azimuthal resistivity measurements of earth formation. Current from the pads, guard electrodes and a measure electrode are measured while monitoring the voltage difference between pairs of mo... | 09/19/2006 |
| 7098664 | Multi-mode oil base mud imager A multi-mode oil base mud imager for use in non-conductive drilling fluid includes at least one current source—a current return pair, and one or more monitor electrodes not located between the current source and the current return of the current source-current ret... | 08/29/2006 |
| 7062072 | Methods of producing images of underground formations surrounding a borehole 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 dept... | 06/13/2006 |
| 7042225 | Apparatus and methods for induction-SFL logging A well logging tool includes an induction array stack disposed on a mandrel; an electronic module stack disposed adjacent the induction array stack along a longitudinal axis of the well logging tool; and a shallow electrode array arranged on a housing disposed aroun... | 05/09/2006 |
| 7027922 | Deep resistivity transient method for MWD applications using asymptotic filtering A method is discussed of obtaining a parameter of interest of an earth formation, typically a formation resistivity or a distance to a bed boundary, in conditions where an induction tool is using having a body with finite, non-zero conductivity. The method substanti... | 04/11/2006 |
| 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 |
| 6925384 | Method for resistivity anisotropy determination in conductive borehole environments A method for determining formation resistivity anisotropy in a wellbore environment. The method of the present invention effectively extends the dynamic range of the existing well logging service of the multi-component induction tool, allowing the use of this servic... | 08/02/2005 |
| 6801039 | Apparatus and method for measuring mud resistivity using a defocused electrode system A mud resistivity measuring device for use in a borehole includes a pair of current electrodes disposed between a pair of guard electrodes. The measure electrodes are carried on a recessed portion of a logging tool so that the measure current flows substantially alo... | 10/05/2004 |
| 6667621 | Method and apparatus for determining the resistivity of a formation surrounding a cased well The invention relates to a method and apparatus for studying the resistivity of a geological formation around a borehole fitted with metal casing. An electric current is applied to the casing so as to cause current to leak into said formation at a given l... | 12/23/2003 |
| 6633164 | Measuring focused through-casing resistivity using induction chokes and also using well casing as the formation contact electrodes A petroleum well (20) for producing petroleum products that incorporates a system adapted to controllably measure a formation resistivity using induction chokes (91-95) to form electrically isolated piping structure sections that can be used as the format... | 10/14/2003 |
| 6426625 | Apparatus for logging the resistivity of a geological rock formation A small diameter tool for measurement of resistivity of geological rock formations, including a complex auxiliary electrode structure which is adjustable in electrode length between deep and shallow mode measurement operations.... | 07/30/2002 |
| 6373254 | Method and apparatus for controlling the effect of contact impedance on a galvanic tool in a logging-while-drilling application The present invention describes a method and apparatus to control the effect of contact impedance on a formation resistivity measurement during a logging-while-drilling operation. The control of contact impedance is accomplished by maintaining a substanti... | 04/16/2002 |
| 6369575 | Methods and apparatuses for measuring the resistivity of drilling mud in a borehole A method of measuring the resistivity of drilling mud in a borehole passing through a terrestrial formation includes the steps of a) inserting a sonde into the borehole, the sonde having an elongate body provided with at least one annular current electrod... | 04/09/2002 |
| 6060886 | Radial sounding electrical well logging instrument An apparatus for determining radial distribution of resistivity of earth formations surrounding a wellbore. The apparatus includes a sonde mandrel having an insulating exterior surface and electrodes disposed on the insulating surface at spaced apart loca... | 05/09/2000 |
| 6046593 | Method/apparatus for measuring mud resistivity using a focused-electrode system The invention relates to a method of measuring the resistivity of a drilling mud by means of a sonde provided with an annular current electrode (A0) and with annular guard electrodes (A, A'), current I0 being emitted into the surroun... | 04/04/2000 |
| 6025722 | Azimuthally segmented resistivity measuring apparatus and method An instrument for measuring resistivity of earth formations within azimuthal segments. The instrument includes azimuthally separated measure electrodes placed in contact with the wall of a wellbore penetrating the earth formations. The electrodes are plac... | 02/15/2000 |
| 6023168 | Apparatus and method for measuring the resistivity of underground formations A method for measuring formation resistivity uses a tool including a central current electrode and a series of voltage electrodes arranged in pairs on either side of the current electrode. A series of measurements is made using the current electrode with ... | 02/08/2000 |
| 5883515 | Method of determining formation resistivity utilizing combined measurements of inductive and galvanic logging instruments A method of determining selected parameters of an earth formation surrounding a borehole by first, obtaining at least one induction logging measurement of the selected parameters in a first predetermined volume of the formation surrounding the borehole ha... | 03/16/1999 |
| 5852363 | Methods and apparatus for measuring characteristics of a formation around a borehole using computed focusing A method and apparatus for determining the geometrical characteristics of a well, including insertion of a sonde of elongate shape into the well, the sonde including azimuth electrodes (Aazi), an annular current electrode (A0), and a... | 12/22/1998 |
| 5721492 | Electrical logging sensor having conductive and insulating portions formed by layer deposition of hard materials and its method of manufacture A sensor element especially adapted for use in borehole resistivity logging, having an outside surface comprising conductive portions and insulating portions distributed in a determined pattern, said conductive and insulating portions being made respectiv... | 02/24/1998 |
| 5708369 | Capacitive measuring device A capacitive measuring device with a measuring electrode (3) arranged some distance from a counter-electrode (8), a dielectric material for analysis is arranged between the electrodes (3, 8), and a measuring current (IC) is supplied to the measuring elect... | 01/13/1998 |
| 5426368 | Logging method and apparatus for investigating geometrical characteristics of a borehole and for investigating formation resistivity A logging method and apparatus for investigating the geometrical characteristics of a borehole comprises an array of circumferentially spaced apart azimuthal current electrodes (Aazi) disposed on a sonde (21), and an annular current electrode (... | 06/20/1995 |
| 5399971 | Method and apparatus for evaluating formation resistivity using focused annular and azimuthal electrodes The apparatus includes an array of azimuthal current electrodes (Aazi) that are circumferentially spaced apart from one another on a body together with two annular guard electrodes (A2) disposed on opposite sides of the array of azimuthal curre... | 03/21/1995 |
| 5396175 | Method and apparatus for evaluating formation resistivity using focused annular and azimuthal electrodes The apparatus includes an annular current electrode (Ao) mounted on a body and guard electrodes (A2, A'2) disposed on the body above and below the annular current electrode. A first measurement current (Io) is emitted by the central current electrode (Ao)... | 03/07/1995 |
| 5343153 | Well logging method and apparatus using passive azimuthal electrodes The invention relates to a logging method and apparatus using passive azimuthal electrodes. The apparatus includes an array of azimuthal electrodes (M'azi) that are circumferentially spaced apart from one another on a body together with two ann... | 08/30/1994 |
| 5268641 | Logging method and apparatus for measuring the Grondingen effect-corrected resistivity of earth formations A logging method for measuring the resistivity of formations having a borehole passing therethrough, in which a logging sonde is suspended inside the borehole by means of a cable, the sonde comprising electrodes for injecting alternating currents into the... | 12/07/1993 |
| 4786874 | Resistivity sensor for generating asymmetrical current field and method of using the same A device for detecting and sensing the boundaries between differing rock strata is provided. This device utilizes electrical conductivity or resistivity to detect and measure the boundary layer. The device of the present invention may be used with a "meas... | 11/22/1988 |
| 4743854 | In-situ induced polarization method for determining formation permeability An in-situ method of determining the pore size distribution, capillary pressure curve, and permeability of a formation using induced polarization logging measurements. The induced polarization (IP) voltage decay curve is measured opposite the formation of... | 05/10/1988 |
| 4730162 | Time-domain induced polarization logging method and apparatus with gated amplification level The stimulus signal for an induced polarization logging system is presented to the formation intermittently, alternately being applied and removed as a square wave of alternating polarity, and the response signal amplification level is time gated with the... | 03/08/1988 |
| 4697150 | Two electrode well logging system for measuring resistivity of subsurface formations A well logging instrument for measuring the resistivity of relatively thin formation beds. A well logging instrument includes an elongated body member, serving as a single guard electrode, and a point current emitting measure electrode recessed therein. T... | 09/29/1987 |
| 4658215 | Method for induced polarization logging An induced polarization tool using focused electrodes that uses direct coupling in the focusing loop to prevent spurious phase shifts. The invention uses a differential-in differential-out amplifier and voltage-controlled resistances to provide zero poten... | 04/14/1987 |
| 4646026 | Method and apparatus for measuring resistivity of an earth formation A method and apparatus are described for reducing "Groeningen" effect and other anomaly induced errors in resistivity measurements of an earth formation. Such errors are typically noted during resistivity measurements of an earth layer and are generally r... | 02/24/1987 |
| 4583046 | Apparatus for focused electrode induced polarization logging An induced polarization tool using focused electrodes that uses direct coupling in the focusing loop to prevent spurious phase shifts. The invention uses a differential-in differential-out amplifier and voltage-controlled resistances to provide zero poten... | 04/15/1986 |
| 4471307 | Amplitude modulated resistivity logging system In the preferred and illustrated embodiment of a downhole oil well resistivity logging tool having a focused electrode, the current ideally flows from the electrode radially outwardly in a thin sheet deep into the earth's formation adjacent to the well. T... | 09/11/1984 |
