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| Number | Title | Issue Date |
| 5200705 | Dipmeter apparatus and method using transducer array having longitudinally spaced transducers A disclosed embodiment utilizes one or more toroidal coil antennas mounted, in an insulating medium, on a drill collar to induce currents which travel in a path that includes the drill collar and earth formations around the drill collar. At least one arra... | 04/06/1993 |
| 5184079 | Method and apparatus for correcting data developed from a well tool disposed at a dip angle in a wellbore to eliminate the effects of the dip angle on the data In a well logging truck computer which phroduces an induction log, a dip correction algorithm, stored in a memory of the computer, corrects an error introduced in the induction log by dip effect. The dip effect error is introduced into the induction log w... | 02/02/1993 |
| 5162994 | Method for determining dip and strike angles in borehole ultrasonic scanning tool data A method of data conversion is set forth. In this system, the amplitude of a borehole sidewall response is recorded as a data record. This includes a sinusoidal representation of an interface. Several points on the sinusoidal curve are transformed in para... | 11/10/1992 |
| 5142472 | Method of measuring the resistivity and thickness of a thin underground layer using induction logging A method used for determining true in-situ resistivity of a thin layer within a formation from dual induction log data. The method calculates true resistivity without the existing need: 1) for an accurate estimate of the layer thickness, or 2) to extrapol... | 08/25/1992 |
| 5128867 | Method and apparatus for determining inclination angle of a borehole while drilling A method and apparatus is presented for determining the inclination angle of a borehole being drilled, the data for determining the inclination angle being obtained while the drillstring is rotating.... | 07/07/1992 |
| 5105356 | Method for curve correlation The maximum correlation between a pair of curves is determined from the maximum value of the common area of such curves with respect to reference lines within a select window as one of the curves is moved through the window while the other of the curves r... | 04/14/1992 |
| 5012412 | Method and apparatus for measurement of azimuth of a borehole while drilling A method and apparatus is presented for measuring the azimuth angle of a borehole being drilled, the data for determining the azimuth angle being obtained while the drillstring is rotating.... | 04/30/1991 |
| 4942528 | Dipmeter processing technique A process for processing a dipmeter curve is shown in the preferred embodiment. In a curve, line segments are drawn between curve minima, a second set of line segments are drawn between minima in the first segments, and this is repeated to desired number ... | 07/17/1990 |
| 4939649 | Method of correcting nonunimodality of dipmeter traces by uniquely transforming individual traces or intervals A set of dipmeter data comprising monunimodal-symmetric datasets is processed prior to correlation and dip computation and display by transforming the nonunimodal-symmetric datasets into unimodal-symmetric datasets while maintaining the subsets which are ... | 07/03/1990 |
| 4873636 | Interpretation of conical structures from dipmeter surveys A method as disclosed of assisting in the determination of the existence of conical folding of the geological formation utilizing an existing dipmeter survey obtained through a wellbore penetrating the geological formation. Estimates of plunge and apertur... | 10/10/1989 |
| 4853855 | Dipmeter processing technique A process for processing a dipmeter curve is shown in the preferred embodiment. In a curve, line segments are drawn between curve minima, a second set of line segments are drawn between minima in the first segments, and this is repeated to desired number ... | 08/01/1989 |
| 4852005 | Method of computing formation dip and azimuth A dipmeter signal processing method and system are disclosed, wherein portions of at least three are matched, utilizing correlation intervals, to derive a plurality of possible offsets. For each of the offsets, the spatial coordinates are defined of an as... | 07/25/1989 |
| 4791618 | Well logging method and system for detecting structural and stratigraphic geological make-up of subsurface formations Disclosed are a well logging process and a well logging system using dipmeter and other logs to find subsurface faults and unconformities and automatically produce therefrom, and with user interaction, a subsurface map of the structural and depositional e... | 12/13/1988 |
| 4781062 | Conjugate fracture systems and formation stresses in subterranean formations Subterranean fault-related facture systems are located and identified and the direction of action of paleostresses causing the fault-related fracture system can be determined from a record representative of depth, dip angle, and dip direction of subterran... | 11/01/1988 |
| 4779201 | Borehole scanner and sonde position locator for spectral analysis of wall An optical head (12) is rotated while a sonde (11) is moved up or down within a bore hole (22), and a beam of light from a light source (22) is projected toward the wall of the bore hole (22) via a lens (21), slit (22), half-mirror (19), mirror (15) and l... | 10/18/1988 |
| 4758956 | System for replacing defective portions of log data A compter-based log processing system is described herein for exploring a subsurface formation and that uses log signals and dip signals. The system includes signal processing circuitry for storing each signal as a value individually within a universally ... | 07/19/1988 |
| 4638254 | Method of determining and displaying the orientation of subsurface formations The preferred geological orientation of geological formations is determined by geological measurements. These measurements are represented by original vectors which are converted into lineations which represent the extension of the vectors to their inters... | 01/20/1987 |
| 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 |
| 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 |
| 4359766 | Method for reconnaissance geophysical prospecting A method for deriving seismic information of more generalized nature over a relatively large and previously unexplored expanse of land to determine relevant strike, dip, velocity and related information. The method consists of the placing of a plurality o... | 11/16/1982 |
| 4357660 | Formation dip and azimuth processing technique Illustrative embodiments of the present invention include methods and apparatus for processing measurements indicative of the dip and azimuth of formation features at various depths in a borehole to produce three-dimensional representations of the formati... | 11/02/1982 |
| 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 |
| 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 |
| 4334271 | Well logging method and system The disclosed technique finds and shows the attitude of one or more bedding surfaces of an underground earth formation which intersect a borehole in that formation. It starts with a log for each respective path along which a multipath investigating tool t... | 06/08/1982 |
| 4316250 | Dip determination by statistical combination of displacements Disclosed are a process and a system which relate to well logging, to converting logs to dips of subsurface formations and to producing a new type of a map record of dips. The map record conforms to a plane which is transverse to the borehole and contains... | 02/16/1982 |
| 4303975 | Dipmeter displacement qualifying technique An improved dipmeter plot of the attitudes of earth formation features in the vicinity of a borehole is produced by using a dipmeter which has at least four transducers urged into contact with the borehole wall, detecting which (if any) of the transducers... | 12/01/1981 |
| 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 |
