Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 4869322 | Sequential hydraulic fracturing of a subsurface formation A subsurface formation having original in-situ stresses that favor the propagation of a horizontal fracture is penetrated by a borehole. A first fracturing fluid containing a propping material is pumped through the borehole and into the formation at a fir... | 09/26/1989 |
| 4868751 | Method for determining relative permeability of a subterranean reservoir A core sample from a subterranean reservoir is placed in a pressure cell holder and the core pressure is measured at a plurality of pressure points along the core before and during fluid flooding. A computed tomography (CT) scanning system provides images... | 09/19/1989 |
| 4864864 | Method for measuring stress deformation of materials A sample of material is rotated within a pair of parallel, spaced-apart laser beams. Variations in the diameter of the sample are determined with azimuth from the amounts of the laser beams intercepted by the sample as it rotates about an axis perpendicul... | 09/12/1989 |
| 4860265 | Seismic trace restoration using F-K filtering Method of restoring null traces in seismic records. The seismic record is transformed from the x-t domain to the f-k domain by a series of fast Fourier transforms. The f-k transform of the seismic record is filtered to retain only coherent events and the ... | 08/22/1989 |
| 4858200 | Method for determining the presence of hydrocarbons in subsurface geological formations by comparative assessment of compressional and shear wave reflection data Method for determining the presence of hydrocarbons in subsurface geological formations by comparative assessment of compressional wave reflection information and shear wave reflection information estimated from acquired compressional wave information fro... | 08/15/1989 |
| 4858199 | Method and apparatus for cancelling nonstationary sinusoidal noise from seismic data Method and apparatus for cancelling nonstationary sinusoidal noise from seismic data. An estimate of the sinusoidal noise component is applied to a contaminated signal containing both a sinusoidal noise component and a non-sinusoidal data component to can... | 08/15/1989 |
| 4858198 | Determination of formation permeability from an acoustic log A formation surrounding a borehole is traversed with a logging tool employing an acoustic transmitter and a pair of spaced-apart acoustic receivers. Acoustic energy traveling through the formation from the transmitter to the receivers are detected. The en... | 08/15/1989 |
| 4857867 | Method and apparatus for locking the frequency and phase of a local oscillator The output of a local oscillator is applied to an external signal to produce a feedback error signal. The feedback error signal is utilized in adjusting the phase, frequency and amplitudes parameters of the local reference sine-cosine quadrature component... | 08/15/1989 |
| 4858201 | Method for estimating shear wave reflection data from acquired compressional wave reflection data An improved method is disclosed for obtaining shear wave data from common depth point gathered compressional wave traces using variations in the amplitude of the gathered compressional waves with source receiver offset. The shear wave data is determined f... | 08/15/1989 |
| 4858202 | Method for estimating shear wave reflection data from acquired compressional wave reflection data An improved method is disclosed for obtaining shear wave data from common depth point gathered compressional wave traces using variations in the amplitude of the gathered compressional waves with source receiver offset. The gathered compressional waves ar... | 08/15/1989 |
| 4853903 | Method and apparatus for removing sinusoidal noise from seismic data Method and apparatus for removing sinusoidal noise from seismic traces comprised of a seismic data component and a sinusoidal noise component. Seismic traces acquired by conventional seismic exploration of a subsurface formation are utilized to produce a ... | 08/01/1989 |
| 4848487 | Method for minimizing mud solids invasion of core samples obtained during subsurface coring A core sample of an earth formation is obtained by drilling with a coring bit and circulating a coring fluid through the coring bit. The coring fluid contains no mud solids for contaminating the core sample or, in the alternative, contains drilling mud mi... | 07/18/1989 |
| 4844182 | Method for improving drill cuttings transport from a wellbore A borehole tool employs a drill string having a plurality of sections of drill pipe connected together for traversing a wellbore. Drilling fluid is circulated down the drill string and up the annulus between the drill string and the wellbore to transport ... | 07/04/1989 |
| 4843598 | Method of shear wave porosity logging of a subsurface formation surrounding a cased well The porosity of a formation surrounding a cased well is determined from a shear wave log of the formation. Shear wave velocity is derived from the log and formation porosity is identified from a predetermined correlation between core-derived porosity for ... | 06/27/1989 |
| 4829487 | Method for restoring seismic data using cross-correlation Method of restoring null traces in seismic records. A trace for which restoration of the data is desired, as well as adjoining traces on each side of the null trace are selected. A series of cross-correlations are determined for all points on the selected... | 05/09/1989 |
| 4813026 | Method for logarithmic analysis of seismic reflection signals A seismic marine survey is carried out by traversing a line of exploration with an acoustic energy source, an array of spaced-apart receivers, and a recording system. Seismic reflection signals recorded by the receivers are digitized to provide a pluralit... | 03/14/1989 |
| 4809545 | Gravimetry logging A gravity gradient logging tool is used to conduct a gravimetry survey of an earth formation. A pair of piezoelectric transducers are located at spaced apart positions within the logging tool. Each transducer is loaded with a known mass and excited electr... | 03/07/1989 |
| 4802146 | Method for moveout correction and stacking velocity estimation of offset VSP data A moveout correction process and stacking velocity estimation process to permit stacking of vertical seismic profile (VSP) data is disclosed wherein the primary reflection time is determined by using the two-way travel time, the root mean square velocity ... | 01/31/1989 |
| 4802147 | Method for segregating and stacking vertical seismic profile data in common reflection point bins A method for segregating and stacking vertical seismic profile data is disclosed wherein the offset difference between the well location and the position of the source is divided into equal segments, VSP moveout corrected data are placed in common reflect... | 01/31/1989 |
| 4799382 | Method for determining reservoir characteristics of a porous material Measurements of reservoir characteristics of a core sample of a subsurface formation are carried out with the core sample being subjected to pressure cycling. Pore volume changes during such pressure cycling are measured. Pore compressibility is determine... | 01/24/1989 |
| 4797860 | Method for shot point analysis of seismic reflection signals A seismic marine survey is carried out by traversing a line of exploration with an acoustic energy source, an array of spaced-apart receivers, and a recording system. A plurality of receivers along the receiver array are selected and the maximum amplitude... | 01/10/1989 |
| 4790180 | Method for determining fluid characteristics of subterranean formations Core samples are obtained from a plurality of differing depths in a subterranean formation. The samples are dried to effect an evaporation of the water content, leaving behind a salt precipitate. The dried samples are weighed. The salt precipitate is then... | 12/13/1988 |
| 4785882 | Enhanced hydrocarbon recovery Hydrocarbons are produced from a subterranean reservoir by maintaining the effective reservoir pressure below the reservoir crushing pressure during a first production period, causing the effective reservoir pressure to exceed the reservoir crushing press... | 11/22/1988 |
| 4782910 | Bi-polar bender transducer for logging tools A bender acoustic transducer has a flat, piezoelectric element affixed to a flat, elongated inert element. The ends of the inert element are hinged on a supporting rectangular frame which has a rectangular opening. Two sides of the elements are exposed so... | 11/08/1988 |
| 4782501 | Method for determining pore volume compressibility of a porous material A core sample of a porous media of identified porosity at atmospheric conditions is saturated with a fluid having an identified X-ray attenuation coefficient. The fluid saturated sample is scanned with X-rays. Confining stress is applied to the sample and... | 11/01/1988 |
| 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 |
| 4778402 | Thermos flask pressure housing In a well logging system that is subjected to high temperatures and pressures, an improved thermos flask pressure housing is used to insulate sensitive electronic circuits to the detrimental effects of high temperature and extreme pressure. An evacuated a... | 10/18/1988 |
| 4775962 | Marine seismic streamer employing variable aperture flow through spacers A fluid filled marine seismic streamer employs a plurality of hydrophones spaced apart along its length to detect seismic reflection signals from subsurface formations below a water layer. A plurality of fluid blocking members are also spaced apart along ... | 10/04/1988 |
| 4759001 | Termination apparatus for a marine streamer employing a flexible load bearing outer hosewall A hosewall terminating apparatus for a streamer section utilizing a load bearing flexible hosewall includes an inner sleeve having radially extending outward protrusions and an outer sleeve having radially extending inward protrusions. With the inner slee... | 07/19/1988 |
| 4754819 | Method for improving cuttings transport during the rotary drilling of a wellbore A wellbore drill string is formed of a plurality of sections of drill pipe interconnected at tool joints with a drill bit at its lower end. A drilling fluid is circulated down the drill string and up the annulus between the wellbore and the drill string. ... | 07/05/1988 |
| 4752882 | Method for determining the effective water saturation in a low-resistivity hydrocarbon-bearing rock formation based upon rock matrix conductance A low-resistivity, hydrocarbon-bearing subsurface sand formation is logged with an electric logging system. Measurements are taken of formation porosity, water resistivity and formation resistivity. Core samples are taken from the formation water and elec... | 06/21/1988 |
| 4742495 | Acoustic energy transmitter for borehole logging An acoustic transmitter for borehole logging includes a flexure disc acoustic source affixed to one end of an open-ended pipe. A rubber boot surrounds the pipe and flexure disc source and fluidly isolates them from the surrounding borehole fluid. Oil fill... | 05/03/1988 |
| 4739262 | Method for removal of bias difference between magnetometers A method for removing bias difference between two or more similarly operated magnetometers is disclosed wherein the inherent bias difference due to the magnetic field of the towing vessel is removed without determining its relative magnitude. Magnetic dat... | 04/19/1988 |
| 4737937 | Marine seismic streamer employing variable hydrophone density A marine seismic streamer employs a plurality of sections connected together sequentially with fluid blocking connectors. Each section contains a plurality of groupings of hydrophones with the hydrophones within each grouping connected together to provide... | 04/12/1988 |
| 4736349 | Method for estimating shear wave reflection data from acquired compressional wave reflection data A method is disclosed for obtaining shear wave data from common depth point gathered compressional wave traces using variations in the amplitude of the gathered compressional waves with source-receiver offset. The shear wave data can be used to generate p... | 04/05/1988 |
| 4736348 | Method and apparatus for logging the characteristics of materials forming the walls of a borehole A borehole televiewer logging tool employs a transducer assembly having a transmitter of acoustic energy pulses and a receiver of acoustic energy pulses representing reflections of the transmitted acoustic energy pulses from the walls of a borehole traver... | 04/05/1988 |
| 4722095 | Method for identifying porosity and drilling mud invasion of a core sample from a subterranean formation A core sample invaded by drilling mud is scanned with X-rays and computed tomographic images are produced. The images are calibrated to a density scale based on the barite content of the drilling mud. The mud solid volume in the pores of the core sample a... | 01/26/1988 |
| 4719977 | Method of drilling deviated wellbores Directional drilling is carried out with a rotary drilling tool having a drill string, a drill bit, a drill motor for rotating the drill bit independently of the drill string, an extension sub having both axially contracted and axially extended positions ... | 01/19/1988 |
| 4718046 | Method for driving a bender-type transmitter of a borehole logging tool to sequentially produce acoustic compressional and tube waves An acoustic well logging system employs a sine wave tone burst generator which drives a bender-type transmitter in a borehole logging tool to sequentially produce acoustic compressional and tube waves. A sine wave tone burst is selectively swept or fixed ... | 01/05/1988 |
| 4714881 | Nuclear magnetic resonance borehole logging tool A nuclear magnetic resonance logging tool comprises spaced-apart arrays of magnets, oppositely polarized, to produce a homogeneous static magnetic field parallel to the borehole when positioned adjacent the borehole wall. Magnetic material is positioned b... | 12/22/1987 |
