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| Number | Title | Issue Date |
| 5521592 | Method and apparatus for transmitting information relating to the operation of a downhole electrical device A method and apparatus for transmitting information relating to the operation of an electrical device disposed in a borehole, in which information picked up by at least one downhole sensor is conveyed to surface reception means via the wire connection con... | 05/28/1996 |
| 5495237 | Measuring tool for collecting down hole information and metering valve for producing mud-pulse used in the same A measuring tool for collecting down hole information, which essentially has a sensor sub including plural data collecting sensors secured at a forward portion of a drilling pipe and a sonde movable in the drilling pipe. Both the sensor sub and sonde empl... | 02/27/1996 |
| 5455573 | Inductive coupler for well tools An inductive coupling device for coaxially arranged tubular members where the members can be telescopically arranged and the liner member has a magnetic core assembly constructed from magnetic iron with cylinder sloped ends and the outer member has an ann... | 10/03/1995 |
| 5394141 | Method and apparatus for transmitting information between equipment at the bottom of a drilling or production operation and the surface Information can be transmitted between equipment at the bottom of a drilling operation and the surface. A transceiver is provided at the surface, and is connected to both the earth, or the bottom of the ocean in an offshore operation, spaced from the dril... | 02/28/1995 |
| 5358035 | Control cartridge for controlling a safety valve in an operating well An operating well such as an oil well is provided with a safety valve in the tubing thereof. A control cartridge controls the safety valve under the command of control signals transmitted from the surface. The control cartridge includes a housing mounted ... | 10/25/1994 |
| 5359324 | Well logging apparatus for investigating earth formations A logging-while-drilling system is disclosed in which a first subassembly is included near the drill bit, and this subassembly comprises a conducting body with measuring means disposed in it and a first toroidal coil antenna disposed on the body, means fo... | 10/25/1994 |
| 5278550 | Apparatus and method for retrieving and/or communicating with downhole equipment Method and apparatus for fishing for and/or communicating with subsurface apparatus. In a preferred embodiment, a subsurface logging-while-drilling (LWD) or measuring-while-drilling (MWD) apparatus is placed in tandem with a drill string near the bottom o... | 01/11/1994 |
| 5268683 | Method of transmitting data from a drillhead A method for remotely monitoring conditions such as carbon monoxide or methane gas concentration, longwall roof support pressure, machine parameters or uncut coal, trona or potash layer thickness in a natural resource mining system such as a longwall or c... | 12/07/1993 |
| 5189415 | Receiving apparatus A receiving apparatus for receiving information transmitted from a bottomhole to a surface by means of electromagnetic waves. The receiving apparatus includes a receiving antenna for receiving a transmitted signal from the bottomhole, a noise detector for... | 02/23/1993 |
| 5140318 | Data transmission system for downhole logging tools A data transmission system for use with such as the seven conductor logging cable that functions to provide more precise transmission of data signal with reduced interference from higher powered electrical signals present along the line. The data signals ... | 08/18/1992 |
| 5052941 | Inductive-coupling connector for a well head equipment The invention relates to an electrical connector for transmitting electrical signals between the outside and the inside of a well having a well head (20) terminated by a valve assembly (10). The connector comprises at least two inductively coupled electri... | 10/01/1991 |
| 5008664 | Apparatus for inductively coupling signals between a downhole sensor and the surface An apparatus employing a set of inductive coils to transmit AC data and power signals between a downhole apparatus (which may include a sensor and a safety valve) and apparatus at the surface of the earth. In a preferred embodiment, the invention inductiv... | 04/16/1991 |
| 4992787 | Method and apparatus for remote signal entry into measurement while drilling system A method and apparatus for remote signal entry of control or data information from an equipment operator into an MWD system is presented. In accordance with an important feature of the present invention, the magnetometer, which is typically present in com... | 02/12/1991 |
| 4928088 | Apparatus for extracting recorded information from a logging tool A communications system for providing communication between a downhole well logging apparatus and external equipment in which a portion of the external equipment is placed in an aperature in a side wall of the well logging and electromagnetic signals are ... | 05/22/1990 |
| 4914433 | Conductor system for well bore data transmission An improved electrical transmission system for transmitting electrical power and data signals within a well bore having a string of tubular members suspended within it, each tubular member having a receiving end adapted for receiving data signals and a tr... | 04/03/1990 |
| 4901069 | Apparatus for electromagnetically coupling power and data signals between a first unit and a second unit and in particular between well bore apparatus and the surface In the representative embodiment of the new and improved apparatus disclosed herein, the apparatus, including a core of a specific material, couples a first unit to a second unit. The first unit may, for example, be a downhole tool, the second unit being ... | 02/13/1990 |
| 4884071 | Wellbore tool with hall effect coupling The present invention is an improved wellbore tool for coupling to a drill string at a threaded junction and adapted for use in a wellbore during drilling. A sensor is disposed in the wellbore tool for sensing a condition and producing a data signal corre... | 11/28/1989 |
| 4845493 | Well bore data transmission system with battery preserving switch An improved method and apparatus of transmitting data signals within a well bore having a string of tubular members suspended within it, employing an electromagnetic field producing means to transmit the signal to a magnetic field sensor, which is capable... | 07/04/1989 |
| 4806928 | Apparatus for electromagnetically coupling power and data signals between well bore apparatus and the surface In the representative embodiment of the new and improved apparatus disclosed herein, a downhole tool adapted to be coupled in a pipe string and positioned in a well bore is provided with one or more electrical devices cooperatively arranged to receive pow... | 02/21/1989 |
| 4788544 | Well bore data transmission system An improved method and apparatus of transmitting data signals within a well bore having a string of tubular members suspended within it, employing an electromagnetic field producing means to transmit the signal to a magnetic field sensor, which is capable... | 11/29/1988 |
| 4725837 | Toroidal coupled telemetry apparatus A downhole toroidal coupled telemetry apparatus is disclosed in which the secondary winding comprises a plurality of turns wrapped around a generally annular core member.... | 02/16/1988 |
| 4578675 | Apparatus and method for logging wells while drilling An information while drilling apparatus and method for characterizing strata in the vicinity of a drill bit at the lower end of a drill string, including a down-hole module unit and surface receiving and control units. Excitation currents are caused to pa... | 03/25/1986 |
| 4499421 | Digital induction logging system including means for generating a plurality of transmitter frequencies A digital induction resistivity logging system is disclosed for digitally measuring phase components in a receiver signal generated in response to eddy currents flowing in the earth's sub-surface formations. The induction logging system includes a central... | 02/12/1985 |
| 4455529 | Digital induction logging tool including means for measuring phase quadrature components in a phase sensitive detector A digital induction resistivity logging system is disclosed for digitally measuring in one phase sensitive detector both the in-phase (R) and quadrature (X) phase components in a receiver signal generated in response to eddy currents flowing in the earth'... | 06/19/1984 |
| 4348672 | Insulated drill collar gap sub assembly for a toroidal coupled telemetry system An insulated drill collar gap sub for a toroidal coupled telemetry system comprising a first annular sub member (100) operable to be connected at one end to a drill collar and a second annular sub member (104) operable to be connected at the other end to ... | 09/07/1982 |
| 4302757 | Bore telemetry channel of increased capacity Apparatus and method for signaling within a drill hole without disturbing an ongoing drilling operation. High data rates are achieved by using phase and/or amplitude modulation techniques which enable information transfer rates well in excess of the data ... | 11/24/1981 |
| 4215426 | Telemetry and power transmission for enclosed fluid systems The system is described in connection with the control of downhole oil well drilling tools or instruments used in the oil drilling industry. Control wiring extends through the drill pipe employing magnetic coupling between pipe sections. Signal enforcers ... | 07/29/1980 |
| 4181468 | Geothermal energy pump monitor and telemetric system The operation of a geothermal well power-generationsystem is monitored by sensor, communication, and performance monitoring equipment normally associated integrally with the operating power generation system. Sensors detect magnitudes of well water temper... | 01/01/1980 |
| 4126848 | Drill string telemeter system A method and apparatus for telemetering information from the bottom of a borehole to the surface while drilling wherein a wireline is used to transmit the information from the bottom of the borehole to an intermediate position in the drill string, and a s... | 11/21/1978 |
| 4057781 | Well bore communication method Logging while drilling apparatus included in a rotatable drilling string of drill pipe disposed in a well bore. Apparatus generally includes a combination communication system comprising two communication channels coacting in cascade or tandem fashion wit... | 11/08/1977 |
| 4038632 | Oil and gas well disaster valve control system A sonic energy signal is transmitted continuously through the walls of tubing extending down into an oil or gas well, in order to control a disaster valve at the lower end of the tubing. If the signal disappears, the valve shuts automatically. In one embo... | 07/26/1977 |
| 4001774 | Method of transmitting signals from a drill bit to the surface A system for performing wellbore telemetry operations wherein a communication link between a subsurface location in a well and the location substantially at the surface is established and maintained through electromagnetic coupling between two insulated e... | 01/04/1977 |
| 3967201 | Wireless subterranean signaling method A relatively low frequency wireless electromagnetic communication link is established through a subterranean lossy medium such as ground or water by launching and propagating magnetic waves of generally vertical magnetic polarization through the interveni... | 06/29/1976 |
