| Patent Number |
Title Of Patent |
Date Issued |
| 5210495 |
Electromagnetic logging method and apparatus with scanned magnetic dipole direction |
May 11, 1993 |
| In a form of the disclosure, electromagnetic propagation logging measurements are made for several magnetic moment directions of the electromagnetic energy, and can be examined and/or processed retrospectively in order to select the logging information which has a particular desired |
| 5201220 |
Apparatus and method for detecting the presence of gas in a borehole flow stream |
April 13, 1993 |
| A borehole apparatus detects the presence of gas within a formation fluid sample. A light source transmits light rays to an interface between the fluid sample and the flow line. The interface reflects the light rays toward a detector array. The detector array detects light rays having |
| 5153514 |
Antenna and wear plates for borehole logging apparatus |
October 6, 1992 |
| An apparatus is disclosed for investigating nuclear magnetic resonance properties of earth formations traversed by a borehole, including a logging device adapted for longitudinal movement in the borehole. The device includes a first subsystem for producing a static magnetic field in |
| 5012193 |
Method and apparatus for filtering data signals produced by exploration of earth formations |
April 30, 1991 |
| A filter removes certain noise-induced artifacts from a two-dimensional image of a bore-hole wall, this image being formed by signals from a two-dimensional array of staggered electrodes pulled along the bore-hole wall. The noise artifacts are due to a type of noise which varies as a |
| 4964101 |
Method for determining fluid mobility characteristics of earth formations |
October 16, 1990 |
| A method for determining the mobility of fluids within earth formations surrounding a borehole. The preferred embodiment of the invention utilizes measured tube wave parameters such as acoustic slowness and attenuation as indicators of formation fluid mobility, and further modifies the r |
| 4953398 |
Method and apparatus for detecting acoustic vibrations in a borehole |
September 4, 1990 |
| A method of measuring acoustic vibrations affecting the fluid in a well at a plurality of points which are angularly distributed around the axis of the well and which are in the proximity of the wall of the well by means of an apparatus including an elongate body which is rotatable about |
| 4914944 |
Situ determination of hydrocarbon characteristics including oil api gravity |
April 10, 1990 |
| Methods are disclosed which provide for determining in situ the characteristics of hydrocarbons including oil API gravity in a formation traversed by a borehole. The vanadium content in the formation is determined from a logging tool. The total vanadium content is then systematically |
| 4903527 |
Quantitative clay typing and lithological evaluation of subsurface formations |
February 27, 1990 |
| Methods are disclosed which provide for quantifying and characterizing the mineral content of a formation as a function of depth. Elemental data derived from logging tools are input into an element-mineral transform operation, preferably a matrix which is constructed using multivariate |
| 4890486 |
In situ determination of hydrocarbon characteristics |
January 2, 1990 |
| Method for finding in situ the characteristics of oil are provided. The methods generally comprise logging the borehole to determine the total formation content of at least one element such as vanadium, sulfur or nickel associated with oil quality and determining how much of the total |
| 4857852 |
Induction well logging apparatus with transformer coupled phase sensitive detector |
August 15, 1989 |
| A well logging apparatus is disclosed which employs slot antennas having a plurality of conductive probes traversing the slot. Also disclosed are a logging apparatus having electrically isolated antenna probes and a logging apparatus with an improved means for generating and applying a |
| 4855912 |
Method and apparatus for measurement of the thermal behavior of porous media |
August 8, 1989 |
| A method and apparatus for investigating earth formations surrounding a borehole operates by selectively heating a region of the formations, and measuring the thermal response to obtain useful information concerning the characteristic length scales of the pores in the heated region. The |
| 4839644 |
System and method for communicating signals in a cased borehole having tubing |
June 13, 1989 |
| A system and method are disclosed for wireless two-way communication in a cased borehole having tubing extending therethrough. A downhole communications subsystem is mounted on the tubing. The downhole subsystem includes a downhole antenna for coupling electromagnetic energy in a TEM |
| 4794322 |
Method, system, and tool for investigating borehole casings |
December 27, 1988 |
| Systems, for investigating casings which are fitted into boreholes that traverse earth formations and which are suitable for use in evaluating and/or optimizing the cathodic protection of casings and for finding the location and rate of casing corrosion, generally includes a downhole too |
| 4780679 |
Method for determining low frequency conductivity of subsurface formations |
October 25, 1988 |
| Well logging techniques are set forth for obtaining improved measurements of formation dielectric permittivity, conductivity, and water-filled porosity. The effects of dielectric and conductivity frequency dispersion are considered and utilized. In a disclosed embodiment, an estimated lo |
| 4771830 |
Apparatus for positioning well tools in deviated well bores |
September 20, 1988 |
| In the representative embodiment of the invention disclosed herein, new and improved tool-orienting apparatus is adapted to be secured on a well tool that is to be moved through a highly-deviated well bore. To assure that the well tool will remain in a selected angular orientation as it |
| 4766384 |
Well logging apparatus for determining dip, azimuth, and invaded zone conductivity |
August 23, 1988 |
| A well logging apparatus is disclosed which employs slot antennas having a plurality of conductive probes traversing the slot. Also disclosed are a logging apparatus having electrically isolated antenna probes and a logging apparatus with an improved circuit for generating and applying a |
| 4722220 |
Quantitative determination by elemental logging of subsurface formation properties |
February 2, 1988 |
| Methods are disclosed which provide for quantifying and characterizing the mineral content of a formation as a function of depth. Elemental data derived from logging tools are input into an element-mineral transform operation, to determine the quantity of at least one or more dominant |
| 4712424 |
Quantitative determination by elemental logging of subsurface formation properties |
December 15, 1987 |
| Methods are disclosed which provide for quantifying and characterizing the mineral content of a formation as a function of depth. Elemental data derived from logging tools are input into an element-mineral transform operation, preferably a matrix which is constructed using multivariate |
| 4704581 |
Electromagnetic logging apparatus using vertical magnetic dipole slot antennas |
November 3, 1987 |
| An electromagnetic logging apparatus is disclosed which utilizes vertical magnetic dipole antennas for propagation logging, preferably at a frequency greater than 100 MHz. Slot antennas having conductive probes which are perpendicular to the borehole axis, and also perpendicular to a |
| 4703277 |
Method and apparatus for obtaining properties of subsurface formations from textural models deri |
October 27, 1987 |
| Well logging techniques are disclosed which use and/or measure formation textural parameters. A disclosed formation textural model is bimodal in nature, and includes fractions of spherical grains and of platey grains having a single aspect ratio. This model is used in obtaining improved |
| 4689572 |
Electromagnetic logging apparatus with slot antennas |
August 25, 1987 |
| An electromagnetic logging apparatus is disclosed which employs dielectric-filled slot antennas, in conjunction with tuning elements, to obtain improved operation. The apparatus can be used to measure the dielectric constant of formations surrounding a borehole. |
| 4659992 |
Method and apparatus for electromagnetic logging with reduction of spurious modes |
April 21, 1987 |
| The disclosure is directed to an improved method and apparatus for subsurface electromagnetic logging in a borehole wherein means are provided to detect transverse magnetic mode components and to either correct for these spurious components in the processing of the received signals o |
| 4652829 |
Electromagnetic logging apparatus with button antennas for measuring the dielectric constant of |
March 24, 1987 |
| An electromagnetic logging apparatus is disclosed which employs dielectric-filled button antennas, in conjunction with tuning elements, to obtain improved operation. The apparatus can be used to measure the dielectric constant of formations surrounding a borehole. |
| 4652828 |
Method and apparatus for determining dielectric permittivity of subsurface formations |
March 24, 1987 |
| Well logging techniques are set forth for obtaining improved measurements of formation dielectric permittivity, conductivity, and water-filled porosity. The effects of dielectric and conductivity frequency dispersion are considered and utilized. In a disclosed embodiment, a corrected |
| 4614250 |
Logging method and apparatus using a sonde equipped with measuring pads |
September 30, 1986 |
| Dip measurements and investigation of geological formations traversed by a deviated borehole is carried out by means of an apparatus comprising a measuring sonde and a cartridge connected to a cable. The sonde carries four measuring pads regularly distributed by means of articulated arms |
| 4583595 |
Method and apparatus for obtaining fluid samples in a well |
April 22, 1986 |
| A method and an apparatus for taking a sample representative of the fluid present in a well comprises an elongated body, suitable for being suspended down the well at the end of a cable. The body includes a removable sampling vessel fixed sideways in a recessed portion of the body wh |
| 4546314 |
Method and apparatus for measuring the inside diameter of a metallic pipe in a well |
October 8, 1985 |
| A method and apparatus is disclosed for electrically measuring the inside diameter of a metallic pipe such as oil or gas well casing. The transimpedance of two coaxial coils within the pipe is determined and then resolved into its inphase and quadrature components. The difference of the |
| 4520666 |
Methods and apparatus for determining flow characteristics of a fluid in a well from temperature |
June 4, 1985 |
| The invention relates to method and apparatus for determining the flow rate of fluid in a well over an interval including zones where fluid is exchanged between the well and the formations through which it is bored.A logging sonde is used to measure the temperature of the fluid along said |
| 4495604 |
Machine method for determining the presence and location of hydrocarbon deposits within a subsur |
January 22, 1985 |
| In accordance with illustrative embodiments of the present invention, methods for processing well logging data comprises deriving measurements of a plurality of earth formations parameters and combining these measurements in a new manner to enable interpretation of shales and shaly s |
| 4461997 |
Non-conductive logging sonde housing |
July 24, 1984 |
| A logging sonde housing includes a stack of ceramic rings (26) surrounded by a first layer (33) of reinforced plastic material. Elastic seals (28) are placed between the rings and kept under compression by the layer of plastic material. A second elastomeric layer (34) is provided around |
| 4415998 |
Segmented acoustic transmitter for broad frequency investigation of a borehole |
November 15, 1983 |
| A broad bandwidth segmented acoustic transmitter is described formed of a plurality of differently sized, closely spaced acoustically active and separately energizable segments. Each segment is operated at a separate resonance to provide, with the acoustic energy from the other segments, |
| 4369497 |
Machine method and apparatus for determining the presence and location of hydrocarbon deposits w |
January 18, 1983 |
| In accordance with illustrative embodiments of the present invention, methods for processing well logging data comprise deriving measurements of a plurality of earth formation parameters and combining these measurements in a new manner to enable interpretation of shales and shaly sand ty |
| 4362054 |
Method and apparatus for determining direction parameters of a continuously explored borehole |
December 7, 1982 |
| Method and apparatus for continuously determining direction parameters of a borehole from the position of a well logging tool in the borehole during tool movement in the borehole, comprise a well logging tool including an accelerometer and a direction indicator, such as a magnetometer, w |
| 4337969 |
Extension member for well-logging operations |
July 6, 1982 |
| A rigid extension member, for use with a well-logging cable in a borehole, has a means for protecting the well-logging cable disposed along the length of, and on the outer surface of, a cylindrical tube. Means for detachably securing the well-logging cable within the protection means is |
| 4327290 |
Method and apparatus for nuclear well logging with optimized timing for simultaneous measurement |
April 27, 1982 |
| The invention relates to a novel method and apparatus for the cyclical timing of the neutron bursts, spectral gates, tau determination gates, and background measurement periods in a capture spectroscopy measurement. Each measurement cycle period is divided in time into 62 tau units, wher |
| 4319526 |
Explosive safe-arming system for perforating guns |
March 16, 1982 |
| An explosive safe-arming system for use in a perforating gun for oil and gas well wireline operation is disclosed, wherein a donor detonating explosive is used which includes two encased elements. The first element is fixedly secured within the perforating gun, and the second element is |
| 4313317 |
Borehole logging tool cryostat |
February 2, 1982 |
| A borehole logging tool and cryostat therefor to maintain a semiconductor detector at cryogenic temperatures. The cryostat has an elongate single-phase heat sink of solid, thermally conductive material on which the detector is removably mounted. The other end of the heat sink is arra |
| 4312192 |
Borehole logging tool cryostat |
January 26, 1982 |
| A borehole logging tool and cryostat therefor to maintain a semiconductor detector at cryogenic temperatures. The cryostat has an elongate single-phase heat sink of solid, thermally conductive material on which the detector is removably mounted. The other end of the heat sink is arra |
| 4292518 |
Methods and apparatus for measuring thermal neutron decay characteristics of earth formations |
September 29, 1981 |
| In the exemplary embodiments of the invention disclosed, thermal neutron decay characteristics of an earth formation, e.g. the thermal neutron decay time constant .tau. and the macroscopic capture cross section .SIGMA., are measured by detecting indications of the thermal neutron con |
| 4289023 |
Percussion method and apparatus for the investigation of a casing cement in a borehole |
September 15, 1981 |
| A percussion technique is described with which an impulse is applied to an element to bounce it off the inner surface of a casing cemented in a borehole. The movement of the element is automatically measured to produce information from which the bond between the casing and cement behind |
| 4267447 |
Methods and apparatus for measuring thermal neutron decay characteristics of earth formations |
May 12, 1981 |
| In the exemplary embodiments of the invention disclosed, thermal neutron decay characteristics of an earth formation, e.g. the thermal neutron decay time constant .tau. and the macroscopic capture cross section .SIGMA., are measured by detecting indications of the thermal neutron con |
| 4265110 |
Downhole cable tension measuring apparatus |
May 5, 1981 |
| Downhole cable tension measuring apparatus according to the invention is connected between a cable and well-logging apparatus suspended from the cable in a borehole. A rod is placed between the cable and the well-logging apparatus so as to elongate elastically under the effect of cab |
| 4255798 |
Method and apparatus for acoustically investigating a casing and cement bond in a borehole |
March 10, 1981 |
| Methods and apparatuses for acoustically investigating a casing in a borehole to derive the quality of a cement bond behind the casing and casing thickness are described. The techniques employ an acoustic pulse source having a frequency spectrum selected to stimulate a selected radial |
| 4237972 |
Well bore apparatus adapted for being releasably coupled to suspension cables |
December 9, 1980 |
| In the several representative embodiments of well bore apparatus disclosed herein adapted for releasable connection to a suspension cable, a cable-cutting member is arranged within an upper portion of the well bore apparatus for parting the lower end portion of the cable connected to the |
| 4210967 |
Method and apparatus for determining acoustic wave parameters in well logging |
July 1, 1980 |
| A predetermined signal is removed from waveforms generated in an acoustic investigation of a borehole to enable the accurate detection of relatively weak formation signals. A plurality of waveforms are produced from different sonic receivers used in an acoustic investigation of an earth |
| 4210966 |
Selectively combining segments of at least four acoustic well logging waveforms to automatically |
July 1, 1980 |
| At least four waveforms representative of sonic waves obtained from an acoustic investigation of a borehole with at least four sonic receivers are combined to automatically measure a parameter of a wave present in the waveforms. The waveforms are derived from sonic receivers which are |
| 4210965 |
Acoustic well logging method and apparatus for detecting and measuring an acoustic wave |
July 1, 1980 |
| A method and apparatus are described for detecting an acoustic wave in a waveform produced from a sonic receiver in response to an acoustic investigation of a borehole. The maximum amplitude of the waveform is measured and a portion thereof utilized as a threshold for comparison with |
