Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 4694437 | Subterranean surveying apparatus Subterranean surveying apparatus includes a support portion, a connector portion, a housing portion, a positioning portion, a monitoring portion and a control portion. The support portion includes a horizontal reference surface and a base section extendin... | 09/15/1987 |
| 4692908 | Method and apparatus for investigating stand-off in a borehole An acoustic method and apparatus for investigating an earth formation penetrated by a borehole are described. Acoustic transducers are mounted on a tool to accurately determine the distance between a segment of the tool and the wall of the borehole. The a... | 09/08/1987 |
| 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 |
| 4686653 | Method and device for making geophysical measurements within a wellbore A method and device for making geophysical measurements in a wellbore comprising a measuring string of a plurality of measuring tools displaced along a borehole wall connected to a surface control unit by a traction system including a cable, guide pulley,... | 08/11/1987 |
| 4674067 | Method and apparatus for generating low frequency acoustic energy waves An acoustic transmitter is employed in a borehole logging tool for generating low frequency acoustic energy waves. A tube of piezoelectric material is sealed at both ends and filled with liquid. A pliable boot surrounds such piezoelectric tube. At least o... | 06/16/1987 |
| 4671379 | Method and apparatus for generating seismic waves A method and apparatus for generating a seismic wave in a borehole in the earth is disclosed. A portion of the borehole, which may be the bottom of the hole or any other point along its length, is selected as the site for seismic wave generation. A device... | 06/09/1987 |
| 4670862 | Apparatus for producing geophysical measurements in a borehole A measuring tool for producing geophysical measurements within a borehole comprises a crawler belt, at least a portion of which constitutes a support for a transducer. The crawler belt is continuously displaced within the bore hole by means of a suspensio... | 06/02/1987 |
| 4661932 | Dynamic downhole recorder A method and apparatus allows dynamic data to be recorded in a drill string for later playback at the surface. The system includes a transducer located in a sub in the drill string which provides electrical responses to a analog to digital converter. A ti... | 04/28/1987 |
| 4648478 | Device for generating sound pulses inside a well, by percussion A device for generating sound pulses in a well by a mobile mass striking against a target element integral with an elongate body anchored in a well by retractable shoes actuated by hydraulic cylinders. The mobile mass which slides in a first chamber in th... | 03/10/1987 |
| 4649526 | Method and apparatus for multipole acoustic wave borehole logging The inventive multipole acoustic wave logging method includes the steps of introducing a 2n -pole acoustic wave into a virgin earth formation surrounding a borehole but separated from the borehole by an invaded zone, where n is an integer great... | 03/10/1987 |
| 4641520 | Shear wave transducer for stress measurements in boreholes A technique and apparatus for estimating in situ stresses by measuring stress-induced velocity anisotropy around a borehole. Two sets each of radially and tangentially polarized transducers are placed inside the hole with displacement directions either pa... | 02/10/1987 |
| 4633248 | Well logging instrument including shock isolation system A well logging sonde adapted to be lowered in a wellbore which incorporates an improved shock isolation system is set forth in the preferred and illustrated embodiment. An electronic support wafer or circuit board mount within the sonde is enclosed within... | 12/30/1986 |
| 4633449 | Method and apparatus for indirect determination of shear velocity from guided modes Methods and apparatus are described for estimating shear wave slowness of formations traversed by a borehole from guided wave acoustic log data. Acoustic energy is generated at a point in the borehole and received at at least four receiver stations spaced... | 12/30/1986 |
| 4608636 | Slew rate filter for logging cable signal pick-off A signal amplifier system for use in a downhole logging system wherein a signal transmitter is mounted in a sonde suspended on a logging cable thousands of feet into a borehole. Variable slew rate amplifiers connected to a differential amplifier are set f... | 08/26/1986 |
| 4598391 | Seismic exploration using non-impulsive vibratory sources activated by stationary, Gaussian codes, detecting vibrations via receivers within a wellbore and processing the results into distortion-free final records The disclosed invention is a method of seismic exploration using non-impulsive vibratory sources activated by stationary, Gaussian codes in a wellbore environment. The method adds a distortion-free quality to the full-waveform seismic records.... | 07/01/1986 |
| 4596139 | Depth referencing system for a borehole gravimetry system A borehole gravimetry system employs a pair of pressure transducers for lowering into a borehole along with a borehole gravity meter. The pressure transducers are spaced apart vertically within a pressure sonde for producing a pressure differential measur... | 06/24/1986 |
| 4586137 | Method for generating variable well logging data composites Method for generating a composite logging data base from two separate historical data bases in a form suitable for further on-site computerized analysis and processing. A generalized system is provided for automatically producing, as a function of a plura... | 04/29/1986 |
| 4580252 | Wide band acoustic receiver transducer For use in an acoustic logging tool having a sonde adapted to be lowered in a borehole, an improved acoustic transducer comprising a pyramidal frustrum is disclosed. The preferred embodiment incorporates fifteen sides. Each side mounts a piezoelectric cry... | 04/01/1986 |
| 4562556 | Compressional and shear velocity logging method apparatus Shear and compressional velocities of acoustic waveforms in the earth formations surrounding a well bore are measured by analyzing the waveforms propagated through different lengths of substantially the same formation intervals. Phase analysis techniques ... | 12/31/1985 |
| 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 |
| 4524433 | High speed sonic logging using multiple transducers In an acoustic logging system for providing information regarding selected parameters of the wall of a borehole in the earth, and of the rock formation which is adjacent the borehole, in which a single transmit/receive transducer system (T/RTS) mounted on... | 06/18/1985 |
| 4524432 | Measurement of porosity and formation factor using slow compressional waves By establishing a slow compressional wave in subsurface formations, and then measuring the velocity of the slow compressional wave, one can obtain useful information about the porosity and formation factor of the formations through which the slow compress... | 06/18/1985 |
| 4516228 | Acoustic well logging device for detecting compressional and shear waves A borehole logging system employs a compressional wave transmitter and a shear wave transmitter. The transmitters are alternately fired to impart compressional and shear waves into the formations surrounding the borehole. A bender-type receiver, spaced ap... | 05/07/1985 |
| 4507735 | Method and apparatus for monitoring and controlling well drilling parameters A mud logging system for receiving and displaying conditions measured during the drilling of a well includes a plurality of units for receiving and processing signals from sensors responsive to the values of the conditions. A/D convertors in each of said ... | 03/26/1985 |
| 4495604 | Machine method for determining the presence and location of hydrocarbon deposits within a subsurface earth formation 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 interpr... | 01/22/1985 |
| 4453219 | Dipmeter displacement processing technique In order to determine dips of subsurface formations more reliably, a dipmeter tool with three or more transducers, spaced circumferentially around the borehole wall, is used and the transducer outputs are correlated in a novel way to provide redundant ind... | 06/05/1984 |
| 4446539 | Sonic logging tool A sonic logging tool which includes a relatively short sonic wave isolation section and further includes a structural member surrounding a pressure wave generating apparatus for creating a damping shorted turns effect is disclosed. The isolation section i... | 05/01/1984 |
| 4415998 | Segmented acoustic transmitter for broad frequency investigation of a borehole 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 acousti... | 11/15/1983 |
| 4414656 | Well logging system for mapping structural and sedimentary dips of underground earth formations Disclosed is a well logging system using the output of a dipmeter tool, preferably a three or more trace tool, to produce a map showing at least one or more of the following characteristics of the earth formations surrounding a borehole: the location of a... | 11/08/1983 |
| 4398272 | 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... | 08/09/1983 |
| 4393485 | Apparatus for compiling and monitoring subterranean well-test data An apparatus for monitoring the testing of a subterranean well by acquiring data from the well includes means for monitoring transducers positioned downhole, at the wellhead, at a separator or at other locations to obtain the values for a predetermined se... | 07/12/1983 |
| 4365321 | Sonic logging tool A sonic logging tool which includes a relatively short sonic wave isolation section and further includes a structural member surrounding a pressure wave generating apparatus for creating a damping shorted turns effect is disclosed. The isolation section i... | 12/21/1982 |
| 4353122 | Differential noise logging method and apparatus The present invention provides a method and apparatus of differential noise logging. The apparatus includes a mandrel supporting at least two differentially connected acoustic transducers. The noise signals detected by the transducers are filtered, proces... | 10/05/1982 |
| 4348748 | Dipmeter displacement processing technique Illustrative embodiments of the present invention include methods and apparatus for processing geophysical signals derived from sources located at different positions in a borehole to obtain displacements which are then combined to determine the relative ... | 09/07/1982 |
| 4319345 | Acoustic well-logging transmitting and receiving transducers An acoustic well-logging transmitting transducer employing a transmitter portion comprising stacked piezoceramic rings and a resonating metallic plate, the dimension of which determines the frequency, and a conical acoustic reflector for causing reflectio... | 03/09/1982 |
| 4298967 | High resolution downhole-crosshole seismic reflection profiling to resolve detailed coal seam structure A method of seismic surveying which provides a horizontal profile of reflector surfaces located between two spaced apart drillholes which profile appears similar to that of a marine type seismic reflection profile. The method comprising raising and loweri... | 11/03/1981 |
| 4293933 | Well logging apparatus and method: synthetic logs and synthetic seismograms with extrapolated reflector dip from log measurements A borehole investigating device takes measurements of a subsurface earth formation and provides signals forming sonic, formation density or similar logs of the borehole. Additionally, the investigating device measures the dip of seismic signal reflectors ... | 10/06/1981 |
| 4216536 | Transmitting well logging data The accuracy of well logging data transmitted from a downhole location to the surface of the earth is verified by generating the data at the downhole location, storing the data in a subsurface assembly in the well, transmitting signals corresponding to th... | 08/05/1980 |
| 4020452 | Apparatus for use in investigating earth formations In accordance with an illustrative embodiment of the present invention, there is shown a substantially rigid member having interruptions in the longitudinal continuity of the member to provide tortuous paths for the passage of acoustic energy along the me... | 04/26/1977 |
| 4009609 | Method and apparatus for testing a subsurface formation for fluid retention potential A method and apparatus for testing a subsurface formation for the retention of a fluid where energy is passed through the formation, including inserting a test fluid into the formation in the path of the energy, the test fluid having properties of mobilit... | 03/01/1977 |
