Did You Know...
...that in 1800 ether was first used by partyers as a fun diversion? Sniffing the gas led to hilarious and raucous laughter as people watched each other become more and more intoxicated and silly. Several doctors independently realized the value ether would have to anesthetize surgery patients. Of those who claimed rights to the "discovery," none had a happy ending. One had a seizure and died defending his rights. Another spent his life in an asylum because he had been denied acclaim. A third became addicted to chloroform and, in a New York City jail, he soaked a cloth in the drug, severed an artery and bled to death.
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| Number | Title | Issue Date |
| 7424928 | Apparatus, system and method for flexibly coupling sensors to a downhole tool A downhole receiver for gathering seismic and sonic data from inside a borehole includes a substantially tubular housing adapted for axial connection to a tool string, and one or more sensors. A damping element is provided to flexibly couple each sensor to the tubul... | 09/16/2008 |
| 7372777 | Sonic instrumentation apparatus and method for cement bond logging A longitudinally segmented acoustic transducer for a cement bond logging (CBL) tool having a plurality of adjoining PZT ring-like segments driven synchronously in parallel by one or more pulses and caused to vibrate in an anti-resonant mode, substantially below the ... | 05/13/2008 |
| 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 |
| 7263029 | System and method for acquiring seismic and micro-seismic data in deviated wellbores Methods and apparatus are adapted for acquiring seismic data from an array of sensors deployed along a section of a deviated, including horizontal, wellbore for monitoring seismic and microseismic activity. The sensors may be permanently deployed in the wellbore. | 08/28/2007 |
| 6985815 | Instantaneous spectral analysis A method of seismic data processing is described in which a particular wavelet is selected from a plurality of wavelets as being most characteristic of a received seismic signal. A subtracted signal can be determined by subtracting a weighted signal of the particula... | 01/10/2006 |
| 6981550 | Sonde A sonde and an apparatus for the deployment thereof against a well casing is described, the sonde comprising a resilient C-shaped member (22) and at least one sensor (23). ... | 01/03/2006 |
| 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 |
| 6868036 | Oil well acoustic logging tool with baffles forming an acoustic waveguide An acoustic logging tool includes external baffle assemblies forming a waveguide structure at the acoustic source. The logging tool is designed for acoustic logging of earth formation surrounding a borehole. The external baffle assemblies form a waveguide structure ... | 03/15/2005 |
| 6868035 | Method and apparatus for coupling seismic sensors to a borehole wall A method and apparatus suitable for coupling seismic or other downhole sensors to a borehole wall in high temperature and pressure environments. In one embodiment, one or more metal bellows mounted to a sensor module are inflated to clamp the sensor module within th... | 03/15/2005 |
| 6795373 | Permanent downhole resonant source A wellbore system and method for producing seismic waves in an earth formation. The system comprises a cavity containing fluid. The cavity is in a space between a wellbore tubular, which may be casing or production tubing, and the wellbore formation. A device is pro... | 09/21/2004 |
| 6763899 | Deformable blades for downhole applications in a wellbore A method and apparatus for controlling fluidic torque in a downhole tool is provided. One or more rotatable components of the downhole tool comprise a deformable material, such as rubber or SMA, selectively deformable in response to the flow of fluid through the dow... | 07/20/2004 |
| 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 |
| 6672382 | Downhole electrical power system A downhole electrical power system provides long term electrical power in a downhole environment. In a described embodiment, a downhole electrical power system includes a power source which supplies electrical power to a well tool interconnected in a tubu... | 01/06/2004 |
| 6643221 | Structures and methods for damping tool waves particularly for acoustic logging tools In one aspect, the invention involves an acoustic logging tool for performing acoustic investigations of subsurface geological formations. In one embodiment, the tool comprises a generally longitudinally extending tool body adapted for positioning in a bo... | 11/04/2003 |
| 6201764 | Apparatus and method for correcting for capacitance variations in hydrophones A method and an apparatus are provided for matching the response of hydrophones 22 to the response of geophones 24 and significantly reducing response variations between hydrophones caused by inherent characteristics. The method includes the steps of dete... | 03/13/2001 |
| 6196350 | Apparatus and method for attenuating tube waves in a borehole In one embodiment the invention comprises a method of gathering borehole seismic data in which a borehole acoustic instrument is lowered into a borehole in the earth's surface along with a canister positioned about the instrument and a second open bottome... | 03/06/2001 |
| 6193010 | System for generating a seismic signal in a borehole The invention is an apparatus for generating a seismic signal in a fluid filled borehole which includes an elongated housing formed from a gas impermeable material and a controlled frequency energy source within said housing. The housing has an external s... | 02/27/2001 |
| 6170601 | Borehole seismic tool A borehole seismic shuttle tool includes (a) a tool body having a cavity with an opening in the wall of the tool body; (b) an anchoring arm attached to the tool body and operable to anchor the tool body to the borehole wall; (c) a sensor package positione... | 01/09/2001 |
| 6135234 | Dual mode multiple-element resonant cavity piezoceramic borehole energy source A dual mode multiple-element resonant cavity piezoceramic borehole energy source is disclosed. Thus, a source for generating detectable seismic waves in a wellbore is provided which is capable of transmitting useful signals over long distances between the... | 10/24/2000 |
| 6021095 | Method and apparatus for remote control of wellbore end devices A wellbore remote control system is disclosed which includes (1) a transmission apparatus for generating at least one acoustic transmission having a particular transmission frequency, (2) a reception apparatus which includes an electronic circuit (prefera... | 02/01/2000 |
| 6006855 | Borehole seismic detector system employing stabilizers Systems are disclosed for securing near vertically deployed seismic detector systems in a cased well borehole from oscillatory motion during a seismic survey. In one embodiment a generally cylindrical body member of an unsymmetrical shape having one flat ... | 12/28/1999 |
| 5995446 | Method of conducting drilling operations using vertical seismic profiles A method is described for providing improved seismic data to a driller to indicate position and spatial extent of a drilling target which may be up to several hundreds of feet ahead of a drill bit. In one embodiment, the method includes the steps of: surv... | 11/30/1999 |
| 5936913 | Acoustic formation logging system with improved acoustic receiver A receiver section for an acoustic oil well logging tool comprised of a plurality of receiver sub-units connected longitudinally within a rigid tubular member. Each receiver sub-unit has a series of acoustic wave sensors located for receiving and detectin... | 08/10/1999 |
| 5926437 | Method and apparatus for seismic exploration A seismic source and seismic detector are placed within a wellbore, and are secured in generally fixed relation within the wellbore. Multiple sources can be utilized, or multiple detectors may be utilized, within a single wellbore. Also, additional source... | 07/20/1999 |
| 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 |
| 5740126 | Turbo siren signal generator for measurement while drilling systems A self-propelled turbo siren modulator assembly is disclosed for use in an MWD system. The turbo siren includes a fixed turbine deflector located upstream from a rotor, which in turn is located upstream from a fixed stator. Drilling mud flowing through th... | 04/14/1998 |
| 5731550 | Acoustic dipole well logging instrument A dipole acoustic well logging instrument including an acoustic transmitter. Receiver sections are disposed at axially spaced apart locations from the acoustic transmitter. Each receiver section includes an outer shoulder at each end adapted to be placed ... | 03/24/1998 |
| 5728978 | Acoustic isolator for acoustic well logging tool An acoustic well logging tool is shown having a transmitter section and a receiver section spaced apart by a semi-rigid housing. The semi-rigid housing includes a number of rigid tubular members which are joined by interlocking lobes which permit relative... | 03/17/1998 |
| 5563846 | Method and apparatus for well logging to obtain high-resolution seismic images of geological formations surrounding horizontal well bores A meso-scale profiling tool has separate upward and downward focused seismic sources, separate upward looking and downward looking directional receivers and a section of the tool containing the sources and receivers adapted to rotate with respect to the r... | 10/08/1996 |
| 5555220 | Slickline conveyed wellbore seismic receiver The invention is a system for conducting a geophysical survey in a wellbore, comprising a battery-powered, self-contained borehole seismic receiver which internally digitizes and records an electrical signal generated by a transducer in the receiver, and ... | 09/10/1996 |
| 5550785 | Mobile seismic system of great length for wells The mobile seismic system according to the invention is made up by interconnecting reception sections (T1) and of anchoring sections (T2), and possibly emission sections, the assembly being suspended in the well by means of an electro-carrying cable (3). ... | 08/27/1996 |
| 5550788 | Method and system of analysis of the behavior of a drill string The present invention relates to a method and to a system for analyzing drilling conditions and/or the behaviour of a drill string element. It comprises the stages as follows: acquisition of a signal, calculation means are operated, which determine the wavelet... | 08/27/1996 |
| 5541889 | Borehole fluid replacement means and method The signal-to-noise ratio of televiewer signals from a rotary sidewall acoustic-beam scanner is improved by replacing the volume of borehole drill fluid that lies in the path of the acoustic beam with a solid medium characterized by a lower coefficient of... | 07/30/1996 |
| 5537364 | Method and apparatus for conducting seismic surveys from a single well having both seismic sources and receivers deployed therein Method and apparatus for conducting seismic surveys from a single wellbore utilizing an array of seismic detectors and an seismic source suspended downhole from the detectors on a coiled tubing. Actuation of the airgun both generates a seismic signal pene... | 07/16/1996 |
| 5528556 | Combination well logging device The invention concern a combination well logging device adapted to be moved inside a borehole to measure the properties of geological formations through which the borehole passes. The device according to the invention comprises a series of elongate loggin... | 06/18/1996 |
| 5521337 | Seismic profiling tool with variable source/receiver spacer A seismic profiling tool is moveable on a wireline in a well bore for exploring subsurface formations adjacent the well bore at various source-receiver spacings. The tool includes at least one acoustic source, an acoustic receiver assembly, and a spacing ... | 05/28/1996 |
| 5510582 | Acoustic attenuator, well logging apparatus and method of well logging Disclosed is a sonic well tool for performing acoustic investigations of subsurface geological formations penetrated by a borehole. The well tool generally includes a longitudinally extending body for positioning in said borehole. The tool also includes a... | 04/23/1996 |
| 5438169 | Apparatus and method for determining the quality of clamping of a borehole seismic sensor system to the wall of a wellbore The invention is a method and apparatus for measuring the quality of acoustic coupling between a wellbore wall and a borehole seismic sensor system. The system includes the steps of positioning the system at a desired depth in the wellbore and activating ... | 08/01/1995 |
| 5387767 | Transmitter for sonic logging-while-drilling A sonic transmitter assembly for use in logging-while-drilling includes stacks of piezoelectric crystals that extend outwardly from a nodal plate member, and a generally tubular assembly that contains such stacks and has end portions that are sealingly mo... | 02/07/1995 |
| 5325714 | Steerable motor system with integrated formation evaluation logging capacity A steerable motor system with integrated formation evaluation logging capacity is presented. The device comprises a housing, a formation resistivity logging tool, a surface signaling device, a density logging tool, a porosity logging tool and a downhole m... | 07/05/1994 |
