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...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 5010527 | Method for determining the depth of a hydraulic fracture zone in the earth The depth of a hydraulic fracture zone is determined by sensing and recording seismic wave motion at a series of spaced depths in a portion of a bore hole subjected to fracturing pressure during a shut-in period after the application of pressure while the... | 04/23/1991 |
| 4964096 | Method for inversion of seismic data to yield estimates of formation lithology The present invention relates generally to seismic exploration and more particularly to a method for inversion of seismic data to yield estimates of formation lithology. Seismic data representing a measure of reflectivity of subsurface formations to seism... | 10/16/1990 |
| 4953657 | Time delay source coding In seismic exploration, a survey may be conducted using multiple seismic energy sources activated substantially simultaneously. A series of shots is made at each shot point, with a determinable time delay between the activation of each source for each sho... | 09/04/1990 |
| 4955062 | Pattern detecting method and apparatus A pattern detecting method for accurately detecting the position of a center of an image of a pattern is disclosed. The method includes the steps of forming an image of a pattern on an image pickup device, dividing the image of the pattern into plural por... | 09/04/1990 |
| 4944036 | Signature filter system A filtering system is provided for acquiring and processing signals using a sampled filter for signal separation and signal enhancement; such as for determing locations, distances, and times in a geophysical exploration system. Signature signals permit mi... | 07/24/1990 |
| 4935903 | Reinforcement of surface seismic wavefields A marine seismic reflection prospecting system attenuates coherent noise through reinforcement of primary reflection data by the addition of corrected ghost reflection data. The system includes a seismic energy source, a detector, a wavefield separator, a... | 06/19/1990 |
| 4933912 | Three dimensional seismic prospecting method A 3-D seismic prospecting method is provided which employs an areal array of sources and receivers by which seismic traces are generated. The areal array is segregated into a plurality of shells and angularly separted sections from which a preselected num... | 06/12/1990 |
| 4932005 | Fluid means for data transmission A means to transmit recorded data through a fluid medium is disclosed. The preferred embodiment incorporates a positive displacement fluid pump having constant pressure pumping means connected to pump fluid through a drill string for drilling oil wells. A... | 06/05/1990 |
| 4928269 | Determining impedance of material behind a casing in a borehole The present invention is directed to a method of calculating the impedance of a material behind the section of a casing. An acoustic excitation pulse is directed towards a section of the casing, resulting in a return waveform having a reverberation segmen... | 05/22/1990 |
| 4926393 | Multifold vertical seismic profile acquisition method and technique for imaging the flank of a salt dome A seismic layout technique and a processing technique for providing better data acquisition relative to salt domes which utilizes a line of sources in a selected pattern opposite a salt flank from a well bore, and a plurality of spaced receivers are dispo... | 05/15/1990 |
| 4922466 | Method and apparatus for presenting seismic traces A method and apparatus for immediate, substantially real-time representation of the traces of seismic measurements in which the exponents and sign of the signal sample from the stream of data transmitted to a data recording unit (2) are uncoupled and are ... | 05/01/1990 |
| 4922362 | Methods for deconvolution of unknown source signatures from unknown waveform data A method for the determination and deconvolution of the signature of an unknown, non-impulsive source signal. The method supposes that that an array of receivers is positioned at the earth's surface to detect and record the seismic signals resulting from ... | 05/01/1990 |
| 4918669 | Method and apparatus for sonic dip measurement A method and apparatus are disclosed for measurement of earth formation dip utilizing sonic techniques. At least three electroacoustic devices are utilized, each having an electroacoustic transmitter and a pair of electroacoustic receivers. The electroaco... | 04/17/1990 |
| 4918670 | Method for interval velocity analysis and determination of reflector position from before stack seismic data A method for interval velocity analysis and reflector position determination from before stack seismic data includes developing a constant travel-time curve for a source and receiver pair. The process is repeated with other source and receiver pairs in or... | 04/17/1990 |
| 4916673 | Method and apparatus for detecting the peak of an analog signal A method and apparatus for processing a signal generated by a borehole scanning system of the type in which periodic electrical firing pulses initiate a plurality of corresponding acoustic energy pulses which are transmitted from the central portion of th... | 04/10/1990 |
| 4914636 | Method and device for acquisition of seismic data In a method of acquiring seismic data in a prospecting area, an array of excitation vibration receivers is placed on or over the terrestrial surface. A plurality of excitation vibration sources is disposed in the vicinity of the array, each source emittin... | 04/03/1990 |
| 4912683 | Method for acoustically measuring wall thickness of tubular goods A method for acoustically measuring wall thickness of tubular goods utilizes an acoustical transducer with a large bandwidth and high resonant frequency to measure the thickness of thin walls. The transducer is exposed directly to fluids in the tubular go... | 03/27/1990 |
| 4912682 | Point location determination at or close to the surface The application discloses a method of determining the relative positions of a plurality of points located substantially in a common plane at or close to the surface of the sea, which method comprises deploying at each of said points an acoustic element co... | 03/27/1990 |
| 4910716 | Suppression of coherent noise in seismic data A method is disclosed to suppress coherent noise in seismic data. Based on the Karhunen-Loeve Transform, this method trains on a region containing undesired coherent noise. Eigenvectors determined from the convariance matrix of that noise are used to reco... | 03/20/1990 |
| 4908803 | Semi-sequential transmission method and system using simultaneously several radio transmission frequencies for connecting a seismic reception assembly to a central control and recording laboratory A semi-sequential transmission method and system are provided making it possible for successive groups of seismic acquisition apparatus to communicate simultaneously, using several transmission frequencies, with a central seismic laboratory. Each of said ... | 03/13/1990 |
| 4908802 | Apparatus for fiber optic seismic exploration system A two-port fiber optic repeater includes means for receiving and restoring command word signals and means for receiving and restoring return data signals. A periodically actuated power supply supplies power to circuitry for sensing valid signal inputs to ... | 03/13/1990 |
| 4908801 | Real-time simulation of the far-field signature of a seismic sound source array A method for extrapolating the far field signature of a seismic sound source array from near field measurements, by taking into consideration, the instantaneous firing and environmental parameters that exist locally for each individual sound source in the... | 03/13/1990 |
| 4907206 | Method for estimating formation lithology A novel method of geophysical exploration is described for obtaining estimates the formation lithology from measures of formation anisotropy. First and second measures of formation anisotropy can be transformed into estimates of formation lithology by cro... | 03/06/1990 |
| 4907204 | Method for identifying formation fractures surrounding a well casing An acoustic borehole logging tool traverses a fluid-filled cased well with an acoustic energy transmitter. Pressure waves created in the well fluid by the transmitter generate tube waves in the well casing. A closely spaced receiver detects tube waves tha... | 03/06/1990 |
| 4905205 | Method for transmitting to a central recording device seismic data collected by acquisition apparatus distributed over the ground and a device for implementing same A method is provided for the transfer to a central recording device of data corresponding to signals received by a set of seismic sensors which have been sampled, digitized and stored by a plurality of data acquisition apparatus and a device for implement... | 02/27/1990 |
| 4905203 | Downhole doppler flowmeter A well logging system which monitors the flow rate of a fluid flowing in a borehole traversing an earth formation includes a sonde. A transmitter located in the sonde transmits acoustical waves into the fluid at a predetermined frequency. A receiver also ... | 02/27/1990 |
| 4905208 | Distance detecting apparatus A distance detecting apparatus has a transmitter for transmitting a cyclic output signal. The transmitter is digitally controlled to adjust the frequency of the output signal in relatively small increments through a band of frequencies. A receiver receive... | 02/27/1990 |
| 4905204 | Method of weighting a trace stack from a plurality of input traces A method is disclosed for developing a weight function for a trace stack from the weight functions derived from the respective weight functions of an ensemble of individual separate input traces. Also disclosed is the method of developing the resulting we... | 02/27/1990 |
| 4903245 | Downhole vibration monitoring of a drillstring Apparatus for monitoring vibration of a bottom hole assembly used to drill a well includes at least one accelerometer mounted in the bottom hole assembly to generate data in the form of electrical signals corresponding to the acceleration experienced by t... | 02/20/1990 |
| 4901290 | Apparatus for the generation of pressure pulses in drilling mud compositions The apparatus for the generation of pressure pulses in a drilling mud composition which flows downward in a drill string (1) is composed of a valve (V) inside the drill string (1), with a stationary, braced, tubular exterior housing (3), tubular primary v... | 02/13/1990 |
| 4899844 | Acoustical well logging method and apparatus A method and tool for acoustically logging a wellbore where a transmitter simultaneously generates a plurality of separate acoustical signals having different frequencies, each effectively centered about a different resonance frequency, and then transmits... | 02/13/1990 |
| 4899323 | Anti-seismic device An anti-seismic device which comprises anti-seismic rubber bearings and dampers arranged in parallel, the anti-seismic rubber bearing being formed by laminating a plurality of rigid hard plates and soft boards having a viscoelastic property one over anoth... | 02/06/1990 |
| 4899319 | Method for determining induced fracture azimuth in formations surrounding a cased well An acoustic logging tool traverses a fluid-filled cased well with an asymmetric acoustic energy transducer. Pressure waves created in the well fluid by the transducer generate asymmetric tube waves in the well casing. At least one spaced-apart transducer ... | 02/06/1990 |
| 4899322 | Integrated geophysical survey system A computer-integrated survey system which is useful in the location of underground obstacles, such as rocks, concrete, steel and ice is disclosed. Specifically, the detection system of the present invention is operated by a microcomputer, having a series ... | 02/06/1990 |
| 4899321 | Method and apparatus for determining the source signature of land vibrators Methods and apparatus for processing vibrative seismic data. Baseplate phaselock vibrative energy, reaction mass phaselock vibrative energy and ground force phaselock vibrative energy are transmitted into the earth using a land vibrator and the reflection... | 02/06/1990 |
| 4897821 | Method and device for initializing data, and particularly seismic data, acquisition apparatus A method and device are provided for initializing acquisition apparatus including the use of coded infrared rays for transmitting data and a control case, the initialization being provided by modulating a light beam in amplitude by means of a carrier sign... | 01/30/1990 |
| 4896305 | Animal luring device An animal luring device is set forth wherein a microphone is operatively associated with a recording and play-back mechanism to initially record and then broadcast an animal sound through a selected frequency. The device is operative through an associated... | 01/23/1990 |
| 4893694 | VSP-based method and apparatus for tieing seismic data shot using different types of seismic sources VSP-based method for tieing surface data shot with different types of seismic sources together. VSP data is acquired using the same types of seismic sources utilized to acquire the surface data. The acquired VSP data is used to produce a correction operat... | 01/16/1990 |
| 4894807 | Simultaneous vertical-seismic profiling and surface seismic acquisition method An inventive method for simultaneously collecting depth-of-focus vertical seismic profiling (VSP) data and three-dimensional surface seismic data is disclosed. At least one seismic sensor is deployed at a predetermined depth of a borehole and raised in in... | 01/16/1990 |
| 4894809 | Method for bin, moveout correction and stack of offset vertical seismic profile data in media with dip Seismic energy is generated at a multiplicity of source offsets from a borehole and offset VSP data is collected by an acoustic detector at a multiplicity of geophone depths for each source offset. The recorded data is sorted into Zero Source-Receiver (ZS... | 01/16/1990 |
