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| Number | Title | Issue Date |
| 5136551 | System for evaluation of velocities of acoustical energy of sedimentary rocks An improved comprehensive system for definition of velocities of acoustic energy of sedimentary rocks is provided. First, geophysical exploration data available in the prior art is collected and organized to be defined as sequences and to define velocity ... | 08/04/1992 |
| 5136525 | Method and apparatus for carrying out borehole temperature measurements A self-contained, programmable temperature sensor is positioned within a suitable pressure housing affixed to a borehole tool to record and store temperature data at predetermined times during operations of the borehole tool in a borehole penetrating a su... | 08/04/1992 |
| 5128866 | Pore pressure prediction method A method of predicting pore pressures at a proposed drilling location using Interval Transit Times derived from seismic data and Interval Transit Times from a calibrated normal geopressure trend. Seismic Interval Transit Times derived pore pressures and a... | 07/07/1992 |
| 5128882 | Device for measuring reflectance and fluorescence of in-situ soil A method and apparatus for real time, on-site detection and analysis of caminant in soil, the invention continuously measures and records specific spectral properties of potentially contaminated soil along a typically vertical profile as a soil penetrati... | 07/07/1992 |
| 5126939 | Method for estimating the organic matter content of sedimentary rocks from data recorded in wells by well-logging probes The invention provides a method for determining the organic matter content of sedimentary rocks from data recorded in the well by at least two well-logging probes measuring different parameters. Two probes are chosen, one for responding in the same direct... | 06/30/1992 |
| 5067090 | Nuclear spectroscopy method and apparatus for digital pulse height analysis A nuclear spectroscopy method for pulse height analysis of an electrical signal emitted by a radiation detector and including nuclear events, such as pulses, whose amplitude is a measure of the energy of the gamma rays collected by said radiation detector... | 11/19/1991 |
| 5051962 | Computerized truck instrumentation system In a representative embodiment of the invention described herein, a well logging system for investigating subsurface formations is controlled by a general purpose computer programmed for real-time operation. The system is cooperatively arranged to provide... | 09/24/1991 |
| 5050130 | Signal processing to enable utilization of a rig reference sensor with a drill bit seismic source An apparatus (10) for providing while drilling information on a subterranean geologic formation (28) includes a drilling rig (12) and a rotary drill bit (18) attached to the drilling rig (12) for providing seismic waves as it drills in the earth (16). Geo... | 09/17/1991 |
| 5012193 | Method and apparatus for filtering data signals produced by exploration of earth formations 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 ty... | 04/30/1991 |
| 4939648 | Apparatus and method for monitoring well logging information A method and apparatus monitors well logging information obtained from a logging apparatus moveable in an earth borehole. In a disclosed embodiment, observers are established for determining the presence of specified characteristics of the logging informa... | 07/03/1990 |
| 4866607 | Self-contained downhole gauge system In an oil well instrumentation system, the downhole sensor system is controlled by a computer which is powered-on only during sampling movement. An independent circuit, continuously powered, detects significant sensor rate-of-change values whereby the com... | 09/12/1989 |
| 4858130 | Estimation of hydraulic fracture geometry from pumping pressure measurements A pump is coupled through a discharge line to a wellbore, which in turn intersects a fracture, the wellbore and fracture being filled with fluid to form a fluid system. Sensors are located in position at the top and, under certain circumstances, at the bo... | 08/15/1989 |
| 4797822 | Apparatus and method for determining the position of a tool in a borehole A system and method for precisely and continuously estimating the path length between the entrance of a borehole and a probe (10) which is supported by an elastic cable (14) and carries a gyrocluster (42) and accelerometer cluster (40). The precise estima... | 01/10/1989 |
| 4783751 | Analysis of pore complexes Analog signals corresponding to color images or pixels of a thin section of a rock reservoir are digitized and then filtered to isolate the pixels representative of pores in the thin section. The pores so isolated are then counted, measured for their tota... | 11/08/1988 |
| 4780857 | Method for logging the characteristics of materials forming the walls of a borehole A borehole logging tool is rotated within a borehole and also advanced along the borehole. A log of the formations surrounding the borehole is recorded. An interval of the borehole intersected by a formation fracture is identified on the recorded log. The... | 10/25/1988 |
| 4763259 | Memory processing systems for well tools A self-contained, down hole powered electrical system in which a well tool microprocessor and circuitry can be programmed from an external microprocessor and verified as to functional capabilities and data can be retrieved from the tool by use of a curren... | 08/09/1988 |
| 4745550 | Processing of oriented patterns Disclosed are a method and a system for processing patterns such as oriented patterns, to derive constituents which are more useful than the original patterns. For example, an oriented pattern such as a seismic section can be decomposed into a flow field,... | 05/17/1988 |
| 4740897 | Memory operated well tools A self-contained, down hole powered electrical system in which the tool has nonvolatile memory means which are independent of applied power thereby permitting the power to the system to be turned off between sampling and further including a system for ree... | 04/26/1988 |
| 4715002 | System for recording a variable value, notably in a well, and for compressing stored measurement interval data To acquire and record the variation of a value such as a pressure as a function of a parameter such as time in a sonde (10) lowered into a well (12), pressure measurements are made at equal time intervals, these measurements are digitized and entered in a... | 12/22/1987 |
| 4703279 | Method of interpreting impedance distribution of an earth formation penetrated by a borehole using precursor data provided by a moving logging array having a single continuously emitting current electrode and a multiplicity of potential electrodes The response characteristics of a combination of hole-centered electric logging tools in a variety of borehole conditions can be obtained by means of impedance values as entries of a matrix resulting from measurements over a series of depth increments, ut... | 10/27/1987 |
| 4703460 | Method and apparatus for acoustic dipole direct shear wave well logging The shear velocity of a formation traversed by a fluid-filled open or cased borehole is obtained directly. Waveforms are obtained from a dipole acoustic investigation of the formation relative to a common location in the borehole. In this investigation, t... | 10/27/1987 |
| 4701891 | Method and apparatus for measuring formation compression and shear wave velocity Method and apparatus for measuring formation compressional and shear wave velocities characterized by a downhole tool having an attenuation chamber between a transmitter and a receiver and a plurality of receivers spaced from the transducer so as to discr... | 10/20/1987 |
| 4689744 | Control method for a recording device A preferred embodiment of a method for developing a single set of time intervals for controlling a memory device effectively utilizes a histograph having two parallel time lines with the same scale. One time line has a series of minimum time periods, each... | 08/25/1987 |
| 4677386 | Method of interpreting impedance distribution of an earth formation obtained by a moving array using end emitting current electrodes sequentially activated and a series of potential electrodes The response characteristics of a combination of hole-centered electric logging tools in a variety of borehole conditions can be obtained by means of impedance values as entries of a matrix resulting from measurements over a series of depth increments, ut... | 06/30/1987 |
| 4677385 | Methd of logging an earth formation penetrated by a borehole to provide an estimate of impedance distribution with depth using end emitting current electrodes sequentially activated and a multiplicity of potential electrodes of a moving logging array The response characteristics of a combination of hole-centered electric logging tools in a variety of borehole conditions can be obtained by means of impedance values as entries of a matrix resulting from measurements over a series of depth increments, ut... | 06/30/1987 |
| 4646240 | Method and apparatus for determining geological facies In a method and apparatus for obtaining a recording of facies of geological formations, logging instruments are moved in a borehole to produce log measurements at successive levels of the borehole. With each level is associated a reference sample whose co... | 02/24/1987 |
| 4626773 | Method and means for determining rock properties using time-domain dielectric spectroscopy A method and system for measuring rock electrical properties using time-domain spectroscopy. The rock to be measured is place in direct contact with the substantially flat face of a sample cell. A voltage pulse is launched into a coaxial line connected to... | 12/02/1986 |
| 4607352 | Method and apparatus for obtaining a display of a characteristic of the periphery of a well The apparatus and method of the present invention pertain to visual presentation systems employing scan lines, wherein each scan line is divisible into sets of points respectively corresponding to locations at which well measurements are made. The resulti... | 08/19/1986 |
| 4543648 | Shot to shot processing for measuring a characteristic of earth formations from inside a borehole A method and apparatus for measuring an earth formation characteristic from inside a borehole penetrating earth formations is described. A tool carrying a sonic transmitter and an array of receivers is moved along the borehole and waveform signals from th... | 09/24/1985 |
| 4532618 | System for and method of processing a seismic signal A seismic signal is created, processed and recorded and then analyzed to determine the nature of subterranean formations. A method of creating, processing and recording a seismic signal comprises the steps of creating a seismic signal; detecting the seism... | 07/30/1985 |
| 4531204 | Computerized truck instrumentation system In a representative embodiment of the invention described herein, a well logging system for investigating subsurface formations is controlled by a general purpose computer programmed for real-time operation. The system is cooperatively arranged to provide... | 07/23/1985 |
| 4528649 | Exploration system for discovering deposits of ore, marker rock and/or economic minerals The present invention provides for the accurate mapping of shallow crustal earth formations by means for refractive seismic waves to identify structure as well as elastic parameters of the strata undergoing survey to indicate deposits of ore, marker rock,... | 07/09/1985 |
| 4397005 | Exploration system for enhancing the likelihood of the discovery of deposits of ore, marker rock and/or economic minerals The present invention provides for the accurate mapping of shallow crustal earth formations by means for refractive seismic waves to identify structure as well as elastic parameters of the strata undergoing survey to indicate deposits or ore, marker rock,... | 08/02/1983 |
| 4393488 | Exploration system and method of determining elastic parameters and subsurface shape of an earth formation so as to indicate likelihood of the formation being an ore, marker rock, economic mineral or the like The present invention provides for the accurate mapping of shallow crustal earth formations by means for refractive seismic waves to identify structure as well as elastic parameters of the strata undergoing survey to indicate deposits of ore, marker rock,... | 07/12/1983 |
| 4355357 | Dipmeter data processing technique Methods and apparatus, for processing signals derived along portions of the length of a borehole to determine the relative position of geological formation characteristics, effect the correlation of pairs of signals using substantially overlapping correla... | 10/19/1982 |
| 4352166 | System and method for visual display of well-logging data A system and method for processing and displaying well-logging data provides direct indications of various lithological characteristics in conjunction with symbolic representatives of formation lithologies. Preselected programming of a two-dimensional sym... | 09/28/1982 |
| 4340934 | Method of generating subsurface characteristic models A method of computer generating a subsurface characteristic model which is substantially consistent with readings taken in a well with a well logging device. A set of actual measurement values which represent readings taken over a given depth interval of ... | 07/20/1982 |
| 4338664 | Method of evaluating formations traversed by a borehole A method which determines output parameters (such as porosity $c; or water saturation Sw of formations) from a set of logging measurements taken at each level of a borehole is proposed. Measurement and response equation uncertainties of each logg... | 07/06/1982 |
| 4314339 | Method of generating subsurface characteristics models A method of computer generating a subsurface characteristic model which is substantially consistent with readings taken in a well with the well logging device. A set of actual measurement values which represent readings taken over a given depth interval o... | 02/02/1982 |
| 4314338 | Method of generating subsurface characteristic models A method of computer generating a subsurface characteristic model which is substantially consistent with readings taken in a well with a well logging device. A set of actual measurement values which represent readings taken over a given depth interval of ... | 02/02/1982 |
