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| Number | Title | Issue Date |
| 7348894 | Method and apparatus for using a data telemetry system over multi-conductor wirelines A data telemetry system for multi-conductor wirelines to enhance transmission of analog and digital signals with frequency content up to 100 kHz by assigning at least two conductors to a first terminal of a data transmittal means and to a first terminal of a data re... | 03/25/2008 |
| 7336562 | Sonic logging tool including receiver and spacer structure A formation logging tool having a substantially continuous central mandrel with regularly spaced mass blocks disposed thereon, at least some of the mass blocks carrying sensors such as receivers. By adopting this structure, the tool can be made to behave as a mass-s... | 02/26/2008 |
| 7313481 | Methods and devices for analyzing and controlling the propagation of waves in a borehole generated by water hammer A method for simulating water-hammer waves in a borehole is used to estimate formation parameters such as porosity and permeability, and to design completion strings. The simulation method uses a model that has a plurality of layers, at least one of the layers inclu... | 12/25/2007 |
| 7310285 | Method for characterizing shear wave formation anisotropy A method of characterizing shear wave anisotropy in a formation includes obtaining crossed-dipole waveforms from a borehole penetrating the formation over a range of depths and frequencies, determining far-field slowness in a fast-shear and slow-shear direction usin... | 12/18/2007 |
| 7230543 | Downhole clock synchronization apparatus and methods for use in a borehole drilling environment Geophysical measurement system employed during the drilling of a well borehole. The system employs a reference clock disposed within equipment at the surface of the earth and a borehole assembly which houses a downhole clock and at least one sensor. The borehole ass... | 06/12/2007 |
| 7228934 | Acoustic generator for distance sounding with a firing mechanism independent of the pressure equilibration force In the oil industry, the acoustic sounding method is a well-known technique for taking the depth measurements of particular attributes of an oil well or borehole. The method involves sending a short, sharp, clear, loud bang sound down a borehole, normally between th... | 06/12/2007 |
| 7196634 | Systems for predicting earthquakes and methods of employing such systems A method of predicting earthquakes includes the step of positioning a first transducer array adjacent to a seismically active region and below the water table, i.e., within the zone of saturation. The first transducer array includes a first plurality of seismometers... | 03/27/2007 |
| 7187620 | Method and apparatus for borehole sensing The present invention provides an apparatus and method for sensing subsurface data. One embodiment of the invention comprises a shuttle attached to a conveyance where the conveyance and shuttle are adapted to be spooled downhole into a borehole for sensing seismic d... | 03/06/2007 |
| 7151465 | Method and apparatus for transmitting information between a salt-cavern and the surface of the ground A method of transmitting information between a salt-cavern and the surface of the ground, the cavern being drilled in geological formation beds and being connected to the surface via an access borehole cased at least in part by metal tubes and presenting at least on... | 12/19/2006 |
| 7134492 | Mapping fracture dimensions Hydraulic fracture dimensions and, optionally, fracture closure pressure and time are determined by adding particulate matter that discharges to create an acoustic signal to the proppant, allowing the particulate matter to discharge, and detecting the acoustic signa... | 11/14/2006 |
| 7116182 | Method and system for downhole clock having compensation A downhole crystal-based clock that is substantially insensitive to the factors that cause frequency deviation. The clock may be maintained at a predetermined temperature using a temperature sensing device and a heating device, where the predetermined temperature co... | 10/03/2006 |
| 7062072 | Methods of producing images of underground formations surrounding a borehole A method of producing images of formations surrounding a borehole, comprises: obtaining values of a first parameter in the borehole as a function of depth and azimuth at a first resolution; obtaining values of a second parameter in the borehole as a function of dept... | 06/13/2006 |
| 7046581 | Well-to-well tomography A method of obtaining a spatial model of a property of part of a subsurface formation located between underground seismic receivers in which at least two sets of pairs of seismic receivers are utilized and one pair of receivers is used to record a signal from a seim... | 05/16/2006 |
| 7042802 | Determination of stress characteristics of earth formations A method for determining the maximum and minimum horizontal stresses of formations surrounding a borehole includes the following steps: suspending a logging device in the borehole; transmitting sonic energy from the logging device to establish flexural waves in the ... | 05/09/2006 |
| 7026951 | Data telemetry system for multi-conductor wirelines An improved data telemetry system for multi-conductor wirelines to achieve satisfactory transmission of analog and digital signals with frequency content up to 100 kHz by assigning at least two conductors to a first terminal of a data transmittal means and to a firs... | 04/11/2006 |
| 6976392 | Atomic clock for downhole applications A system and method for acquiring seismic data are disclosed. The system comprises a controller for causing the generation of a seismic signal, where the controller has a first clock used for time-stamping a record of the generated seismic signal. A seismic receiver... | 12/20/2005 |
| 6973993 | Methods and apparatus of suppressing tube waves within a bore hole and seismic surveying systems incorporating same Methods and apparatus for attenuating waves in a bore hole, and seismic surveying systems incorporating the same. In one embodiment, an attenuating device includes a soft compliant bladder coupled to a pressurized gas source. A pressure regulating system reduces the... | 12/13/2005 |
| 6965849 | Method of designing geophysical surveys A method for the design of VSP surveys for the purpose of imaging a reef in the formations surrounding the well in question. The basic steps include: building a geophysical model; defining receiver locations in the... | 11/15/2005 |
| 6951262 | Method and apparatus for suppressing waves in a borehole Methods and apparatus for suppression of wave energy within a fluid-filled borehole using a low pressure acoustic barrier. In one embodiment, a flexible diaphragm type device is configured as an open bottomed tubular structure for disposition in a borehole to be fil... | 10/04/2005 |
| 6945330 | Slickline power control interface An apparatus, method, and system for use in operating an electric downhole tool on a non-conductive support line (slickline) by converting a battery voltage to an output voltage suitable for operating the tool. In response to receiving a trigger signal, the output v... | 09/20/2005 |
| 6935424 | Mitigating risk by using fracture mapping to alter formation fracturing process A formation fracturing method with which to mitigate risk to hydrocarbon productivity includes pumping fracturing fluid, during at least part of a fracturing job time period, into a well to fracture a formation; generating signals, within the fracturing job time per... | 08/30/2005 |
| 6915875 | Acoustic isolator for downhole applications A plurality of heavy mass irregularities attached to an inner wall of the drill collar attenuate waves traveling through the collar. The plurality of heavy mass irregularities are spaced and sized for the maximum attenuation of acoustic pulses in a predetermined fre... | 07/12/2005 |
| 6912465 | System and method for determining downhole clock drift Techniques are presented for determining the drift of a clock adapted for subsurface disposal. Seismic signals are transmitted through the subsurface medium from an uphole location at selected times, acoustic signals associated with the transmitted seismic signals a... | 06/28/2005 |
| 6837332 | Method and apparatus for cancellation of unwanted signals in MWD acoustic tools An apparatus (10) and method are disclosed for eliminating a noise signal from at least one source during an acoustic measurement of a subsurface geological formation or borehole. The apparatus (10) includes a longitudinal body for positioning in the b... | 01/04/2005 |
| 6837105 | Atomic clock for downhole applications A system and method for acquiring seismic data are disclosed. The system comprises a controller for causing the generation of a seismic signal, where the controller has a first clock used for time-stamping a record of the generated seismic signal. A seismic receiver... | 01/04/2005 |
| 6782970 | Acoustic source using a shaftless electrical hammer A shaftless acoustic source is disclosed having a solenoid, a bullet and driving electronics. The bullet, which is positioned inside the solenoid's coil, can be accelerated by a magnetic force generated when a current pulse is applied to the coil. Acoustic energies ... | 08/31/2004 |
| 6776255 | Methods and apparatus of suppressing tube waves within a bore hole and seismic surveying systems incorporating same Methods and apparatus for attenuating waves in a bore hole, and seismic surveying systems incorporating the same. In one embodiment, an attenuating device includes a soft compliant bladder coupled to a pressurized gas source. A pressure regulating system reduces the... | 08/17/2004 |
| 6739423 | Acoustic logging tool A sleeve for an acoustic logging tool has a structure with a window section having fewer bars than a conventional sleeve separated by a slotted region with thin circumferential slots which are stress-relieved at the ends (“dumb-bell” shaped). Steel receiver moun... | 05/25/2004 |
| 6739692 | Ink jet recording apparatus The present invention provides an ink jet recording apparatus including a carriage to which a recording head for effecting recording on a recording material by discharging ink and an ink tank for containing ink to be supplied to the recording head are detachably mou... | 05/25/2004 |
| 6697710 | Gas pipe explorer robot A gas pipe explorer formed of a plurality of connecting elements, and an articulation element between the connected elements. The connected elements include drive capabilities, and the articulation element allows the connected elements to traverse gas pip... | 02/24/2004 |
| 6614718 | Device and method for seismic drill hole measuring Seismic waves are recorded twice by a reference sensor (8) above ground and by a sensor (18) located in the drill hole (1). Measurements are synchronized by a clock system, the clock associated with sensor (18) being designed specifically for providing su... | 09/02/2003 |
| 6456566 | Use of minor borehole obstructions as seismic sources An acoustic system and method for investigating and monitoring a hydrocarbon or other mineral reservoir. Wellbore tube wave energy may be created by natural or ambient sources or tube waves may be excited intentionally. Wellbore tube wave energy is conver... | 09/24/2002 |
| 6351991 | Determining stress parameters of formations from multi-mode velocity data A method for determining unknown stress parameters in earth formation measures velocities in four sonic transmissions modes (compression, fast shear, slow shear and Stoneley) at a series of depths. Relationships between measured velocities and other measu... | 03/05/2002 |
| 6002639 | Sensor configuration for nulling reverberations to image behind reflective layers A transducer configuration disposed within a wellbore sonde for acoustically imaging a target region behind an acoustically reflective layer includes a transmitting transducer for producing a transmitted acoustic beamspread pattern defined by a insonified... | 12/14/1999 |
| 5996726 | System and method for determining the distribution and orientation of natural fractures In oil and gas production, a process known as hydraulic fracturing is often used. Hydraulic fracturing involves pumping a fluid under pressure down a well bore into a fluid reservoir. When the pressurized fluid enters the reservoir, it produces localized ... | 12/07/1999 |
| 5995447 | System and method for processing acoustic signals to image behind reflective layers A system for acoustically imaging a target region behind an acoustically reflective layer includes a transducer configuration for acquiring acoustic image data from the reflective layer and target region, wherein the reflective layer and target region are... | 11/30/1999 |
| 5963508 | System and method for determining earth fracture propagation Hydraulic fracture extension in earth formation zones of interest may be monitored by placing one or more monitor wells in predetermined positions on opposite sides of an azimuth aligned with the expected fracture plane extending from a fluid waste inject... | 10/05/1999 |
| 5841734 | Rotating acoustic transducer head for cement bond evaluation tool An apparatus for logging a borehole comprises a non-rotating component and a rotating component that is flexibly attached to the non-rotating component and includes a logging head. The rotating component is centralized independently from the non-rotating ... | 11/24/1998 |
| 5834710 | Acoustic pulse gun assembly A gas gun is provided for generation of an acoustic pulse and subsequent detection of return reflections from the annulus of a well. The system includes a gas gun and a hand-held gas source. The hand-held gas source comprises: a two-part housing forming a... | 11/10/1998 |
| 5619475 | Method of predicting mechanical failure in formation utilizing stress derivatives which measure formation nonlinearity A method for determining whether a formation is subject to incipient failure are disclosed. The method comprises determining in situ a nonlinear parameter of a formation, and determining whether the nonlinear parameter and/or a derivative of that nonlinea... | 04/08/1997 |
