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| Number | Title | Issue Date |
| 7301345 | While-drilling methodology for estimating formation pressure based upon streaming potential measurements Logging-while-drilling apparatus and methodologies for measuring streaming potential in an earth formation are provided. The apparatus and methodologies can be utilized to find information relevant to the drilling operations. In particular, since the streaming poten... | 11/27/2007 |
| 7255183 | Gap sub assembly The gap sub assembly comprises a pair of electrically conductive subs. Each sub has a threaded pin and box. A pin and box are threaded together to form a connection. An electrically insulating, woven fabric overlies and conforms with the threads of the connection pi... | 08/14/2007 |
| 7243718 | Methods for locating formation fractures and monitoring well completion using streaming potential transients information Earth formations are characterized by using an array of electrodes which can measure streaming potentials in the formation, and by interpreting the data obtained by the electrodes. The electrodes are placed on a wireline tool, a LWD tool, or in a fixed manner about ... | 07/17/2007 |
| 7233150 | While-drilling apparatus for measuring streaming potentials and determining earth formation characteristics Earth formations are characterized by using an array of electrodes which can measure streaming potentials in the formation, and by interpreting the data obtained by the electrodes. The electrodes are placed on a wireline tool, a LWD tool, or in a fixed manner about ... | 06/19/2007 |
| 7201221 | Wellbores utilizing fiber optic-based sensors and operating devices This invention provides a method for controlling production operations using fiber optic devices. An optical fiber carrying fiber-optic sensors is deployed downhole to provide information about downhole conditions. Parameters related to the chemicals being used for ... | 04/10/2007 |
| 7193420 | Insulated sleeve with conductive electrodes to reduce borehole effects for an induction tool A well logging tool and method are disclosed comprising a conductive mandrel, an antenna array disposed around the conductive mandrel, wherein the antenna array comprises a plurality of antennas disposed on insulating supports and at least one contact spacer, the at... | 03/20/2007 |
| 7152466 | Methods and apparatus for rapidly measuring pressure in earth formations Methods and apparatus for rapidly measuring pressure in earth formations are disclosed. According to a first embodiment of the apparatus, a probe is provided with a movable piston having a sensor built into the piston. According to a second embodiment of the apparat... | 12/26/2006 |
| 7093680 | Subsurface signal transmitting apparatus An insulator for a subsurface signal transmitting apparatus. The insulator includes a housing, a mandrel axially disposed inside the housing, a first insulating material disposed between the housing and the mandrel, a first sleeve formed of a second insulating mater... | 08/22/2006 |
| 7071696 | Measurement device and support for use in a well The invention provides a support for measurement means for monitoring and/or studying a fluid reservoir (13) through which at least one well (11) passes, said support comprising: a cylindrical tube (2); and a jacket (3) surrounding said c... | 07/04/2006 |
| 7040390 | Wellbores utilizing fiber optic-based sensors and operating devices This invention provides a method for controlling production operations using fiber optic devices. An optical fiber carrying fiber-optic sensors is deployed downhole to provide information about downhole conditions. Parameters related to the chemicals being used for ... | 05/09/2006 |
| 7023212 | Insulated sleeve with conductive electrodes to reduce borehole effects for an induction tool A well logging tool and method are disclosed comprising a conductive mandrel, an antenna array disposed around the conductive mandrel, wherein the antenna array comprises a plurality of antennas disposed on insulating supports and at least one contact spacer, the at... | 04/04/2006 |
| 6978672 | Wireline apparatus for measuring steaming potentials and determining earth formation characteristics Earth formations are characterized by using an array of electrodes which can measure streaming potentials in the formation, and by interpreting the data obtained by the electrodes. The electrodes are placed on a wireline tool, a LWD tool, or in a fixed manner about ... | 12/27/2005 |
| 6933726 | Apparatus and methods for reducing borehole current effects A well logging tool includes a conductive mandrel; an antenna array disposed around the conductive mandrel, wherein the antenna array comprises a plurality of antennas disposed on insulating supports and at least one contact spacer, the at least one contact spacer h... | 08/23/2005 |
| 6839000 | Integrated, single collar measurement while drilling tool An integrated, single collar measurement while-while-drilling tool is presented that comprises formation sensors, directional sensors, pressure sensors, a mud pulse telemetry device, and a turbine-generator power device configured in a single collar housing that is ... | 01/04/2005 |
| 6497457 | Drilling, image, and coal-bed methane production ahead of mining A coal mining operation begins by using directional drilling to bore several horizontal shafts through a coal deposit with its natural overburden still intact. Any methane gas permeating the coal deposit is pumped out and preferably sold as natural gas to... | 12/24/2002 |
| 6452395 | Enhanced detection method A method and apparatus for determining properties of rocks surrounding a borehole in which electrokinetic signals are generated in the rocks is disclosed. For example, the signals may be generated by the vibration induced by the drilling of the borehole o... | 09/17/2002 |
| 6225806 | Electroseismic technique for measuring the properties of rocks surrounding a borehole Apparatus and method for measuring the properties of rocks such as permeability, porosity and fluid properties downhole around a borehole (3) in which a seismic source (6) which radiates a seismic signal substantially radially within the borehole is lower... | 05/01/2001 |
| 5689068 | Determination of the porosity and permeability of a geological formation from an electrofiltering phenomenon The porosity and permeability of a geological formation (2) are determined on the basis of an electrofiltering phenomenon by exploiting the existence of non-linear electrofiltering phenomena. One or two pressure generators (11 ) are used to propagate a pr... | 11/18/1997 |
| 5503001 | Determination of permeability of porous media and thickness of layered porous media Process and apparatus for determination of permeability of porous media and thickness of layered porous media by measurement at finite frequency of streaming potential and electro-osmotic induced voltage due to applied finite frequency pressure oscillatio... | 04/02/1996 |
| 5502686 | Method and apparatus for imaging a borehole sidewall A method for concurrently gathering acoustic and resistivity data for mapping the texture of the sidewall of a borehole using a single imaging tool. The data are sampled, formatted and merged to provide a single composite image of the borehole sidewall.... | 03/26/1996 |
| 5402069 | Spontaneous potential measurement apparatus connected between metallic housings of a wellbore apparatus for measuring the spontaneous potential of an earth formation A spontaneous potential (SP) sub is interconnected between two metallic housings of a wellbore apparatus and is lowered into a wellbore. A spontaneous potential (SP) of an earth formation trasversed by the wellbore is measured by the SP sub, and a log is ... | 03/28/1995 |
| 5387869 | Apparatus for measuring transient electric earth current to predict the occurrence of an earthquake An apparatus for measuring transient earth current includes a detection electrode and a second electrode disposed beneath the surface of the earth in vertical alignment with one another at depths greater than those to which electromagnetic waves generated... | 02/07/1995 |
| 5239267 | Method for improving the accuracy of dip determination using adjustable high pass filters The present system is directed to an improved dipmeter system including plural sensors on isolated pads around a sonde. An independent output is formed from each of the sensor pads, and each output is provided to its own adjustable high pass filter. The s... | 08/24/1993 |
| 5229765 | SP noise cancellation technique An adaptive transversal filter is incorporated with an SP conductor extending through a logging cable to the surface from an SP electrode supported on a sonde. This logging cable is operated in a noisy environment and there is the risk of noise on the log... | 07/20/1993 |
| 5214384 | Method including electrical self potential measurements for detecting multiphase flow in a cased hole A method for time lapse electric logging in a cased hole in which electrodes are implanted in the casing or the hole is completed with a gravel packed non conductive, perforated liner that allows an open hole logging tool to be used for time-lapse logging... | 05/25/1993 |
| 5105894 | Method and apparatus for orientating core sample and plug removed from sidewall of a borehole relative to a well and formations penetrated by the borehole A method and apparatus for determining the location in space of a formation sample is set forth. This involves a tool which is typically run on a wireline in a well, the tool supporting orthogonal positioned magnetometers and similar orthogonal accelerome... | 04/21/1992 |
| 5103178 | Method using a pluraliyt of electrode, including a reference electrode, for recording a spontaneous potential curve in a borehole while drilling An apparatus and method for obtaining a spontaneous potential curve, which pparatus is comprised of: (a) an elongated body: (b) a series of vertically spaced electrodes for measuring electrical potential, wherein one of the electrodes is a reference electr... | 04/07/1992 |
| 5008625 | Method and apparatus for logging and displaying a two dimensional image of spontaneous potential Method and apparatus for obtaining fine detail of spontaneous potential (SP) along a bore-hole wall in the earth, in connection with exploration for petrochemical deposits. A laterally-extending array of SP-sensing electrodes is mounted on an insulating p... | 04/16/1991 |
| 4980682 | Method of reducing noise in a borehole electromagnetic telemetry system A borehole telemetry system has a transmitter located in the borehole, a surface receiver, and surface signal sensors for receiving the transmitted signal. There are usually plural sources of electromagnetic noise at a well site which degrade the usefulne... | 12/25/1990 |
| 4916616 | Self-consistent log interpretation method Responses of subsurface formations adjacent a well borehole are obtained from a number of types of well logs. The well logs typically include a resistivity log, a gamma ray log, a density log, a neutron log and an induction or electromagnetic wave log. Pa... | 04/10/1990 |
| 4794322 | Method, system, and tool for investigating borehole casings Systems, for investigating casings which are fitted into boreholes that traverse earth formations and which are suitable for use in evaluating and/or optimizing the cathodic protection of casings and for finding the location and rate of casing corrosion, ... | 12/27/1988 |
| 4625173 | System for monitoring formation spontaneous potential and polarization constant while drilling An electrode insulated from and mounted to the outside of a drill collar in a drill string positioned in a borehole is used for measuring formation spontaneous potential. A current measuring device, such as an ammeter, is connected through a varible ammet... | 11/25/1986 |
| 4608636 | Slew rate filter for logging cable signal pick-off A signal amplifier system for use in a downhole logging system wherein a signal transmitter is mounted in a sonde suspended on a logging cable thousands of feet into a borehole. Variable slew rate amplifiers connected to a differential amplifier are set f... | 08/26/1986 |
| 4523148 | Method and apparatus for determining the spontaneous earth potential log from downhole gradient measurements A method and apparatus for measuring the differential or gradient of an earth variable within a well bore (e.g., the spontaneous earth potential) and producing improved logs of this gradient or differential and its integral variable essentially free of an... | 06/11/1985 |
| 4502121 | Machine method for determining the presence and location of hydrocarbon deposits within a subsurface earth formation In accordance with illustrative embodiments of the present invention, methods for processing well logging data comprises deriving measurements of a plurality of earth formations parameters and combining these measurements in a new manner to enable interpr... | 02/26/1985 |
| 4451790 | Spontaneous potential log apparatus with randomly occurring noise cancellation In the disclosed and illustrated embodiment, an improved method and apparatus for obtaining an improved spontaneous potential log is set forth. On a single sonde, multiple spontaneous potential electrodes, aligned vertically along the length of the sonde ... | 05/29/1984 |
| 4410052 | Method of drilling a productive bed The present invention relates to the completion of wells and, more particularly, it relates to a method of drilling a productive bed. The herein disclosed method of drilling a productive bed comprises the tapping of the bed roof using a starting flushing fluid... | 10/18/1983 |
| 4403290 | Machine method for determining the presence and location of hydrocarbon deposits within a subsurface earth formation In accordance with illustrative embodiments of the present invention, techniques are shown for processing well logging data to provide improved results. More particularly, a technique is disclosed for determining the reliability of well logging computatio... | 09/06/1983 |
| 4369497 | Machine method and apparatus for determining the presence and location of hydrocarbon deposits within a subsurface earth formation In accordance with illustrative embodiments of the present invention, methods for processing well logging data comprise deriving measurements of a plurality of earth formation parameters and combining these measurements in a new manner to enable interpret... | 01/18/1983 |
| 4340934 | Method of generating subsurface characteristic models A method of computer generating a subsurface characteristic model which is substantially consistent with readings taken in a well with a well logging device. A set of actual measurement values which represent readings taken over a given depth interval of ... | 07/20/1982 |
