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| Number | Title | Issue Date |
| 7201231 | Apparatuses and methods for deploying logging tools and signalling in boreholes The apparatus includes a pump for circulating pressurized fluid in a wellbore. A control device controls the pump which a conduit interconnects to the wellbore. A downhole transducer detects changes in fluid pressure at a downhole location and generates signals acco... | 04/10/2007 |
| 7082821 | Method and apparatus for detecting torsional vibration with a downhole pressure sensor A method and apparatus for detecting torsional vibration, or stick-slip, in a drill string while drilling is described. The method comprises sampling a downhole pressure sensor and using embedded filter schemes and algorithms to determine, based on the pressure samp... | 08/01/2006 |
| 5740127 | Pulse production and control in drill strings In fluid pulsing apparatus operable in a drill pipe in a well in which well drilling fluid flows, wherein pressure pulses are created by restricting one or more of several hydraulically parallel paths, constant working pressure regulating valves with a lo... | 04/14/1998 |
| 4675852 | Apparatus for signalling within a borehole while drilling A down-hole signal generator for a mud-pulse telemetry system comprises an annular impeller surrounding a casing and arranged to be driven by the mud passing along the drill string. The impeller serves to drive a torque control arrangement, and preferably... | 06/23/1987 |
| 4596293 | Targetable drill with pressure telemetering of drill parameters A dirigible drilling head is provided with a hydraulic pulser in its rotating inner tube in the form of a spindle piston which can obstruct the flushing medium passage and is displaced by a hydraulic circuit including a hydraulic valve. The hydraulic valv... | 06/24/1986 |
| 4535429 | Apparatus for signalling within a borehole while drilling A down-hole signal transmitter for a mud pulse telemetry system comprises a flow constrictor defining a throttle orifice for the mud flow, a throttling member displaceable to vary the throughflow cross-section of the throttle orifice, and a pump for displ... | 08/13/1985 |
| 4520468 | Borehole measurement while drilling systems and methods A system for providing measurements while drilling a well in which a drill string, made up of standard lengths of drill pipes, some of which may be drill collars, extends from the earth's surface in a borehole, drilling fluid being circulated in the drill... | 05/28/1985 |
| 4513403 | Data encoding and synchronization for pulse telemetry A method and apparatus for encoding and synchronizing and sequencing pulse encoded data in a pulse telemetry system. The time intervals between successive pulses in a pulse train are representative of the magnitude of the data parameters. Redundant pulses... | 04/23/1985 |
| 4483394 | Hydraulic power unit for measurement while drilling apparatus A hydraulic power unit is provided for a downhole instrument of a measurement while drilling system for a well drilling. The hydraulic power unit is enclosed within a drill collar that is connected in the drill string of a rotary drilling rig. An outer bo... | 11/20/1984 |
| 4371958 | Drilling orientation tool In the preferred and illustrated embodiment of the present apparatus, a drilling orientation tool is disclosed utilizing a mud pressure charging system where the pressure charge is converted into hydraulic oil pressure. The hydraulic oil flows is supplied... | 02/01/1983 |
| 4370814 | Well tool for detecting well bore deviation in drill string A well tool for detecting well bore deviation which includes a tool adapted to be connected between adjacent components of a drill string, including a longitudinal opening through which drilling fluid can be circulated. At least one vent hole is located i... | 02/01/1983 |
| 4351116 | Apparatus for making multiple orientation measurements in a drill string An apparatus for making orientation measurements in a drill string within a well bore comprising a tubular housing (22) adapted for insertion into the drill string and first (13) and second (15) measuring devices in the housing for measuring first and sec... | 09/28/1982 |
| 4351037 | Systems, apparatus and methods for measuring while drilling A method and apparatus for continuously logging while drilling a well bore with a rotary drilling rig comprising a drill string, a jet type drill bit, and mud pump means for circulating fluid under pressure. The apparatus generally includes means for sens... | 09/21/1982 |
| 4235021 | Measuring while drilling tool A measuring while drilling tool is disclosed. The preferred embodiment incorporates an outer shell which is connected in a drill string above the drill bit and among the drill collars. The apparatus utilizes mud pressure variations to pump oil with a pist... | 11/25/1980 |
| 4216590 | Wide angle inclinometer Improved apparatus for measuring the angular deviation from the vertical of the end of the drill string which includes a housing adapted for insertion in the drill string, a pendulum pivotally mounted in the housing and capable of swinging through large a... | 08/12/1980 |
| 4184545 | Measuring and transmitting apparatus for use in a drill string Measuring and transmitting apparatus is the subject matter of the preferred embodiment which comprises an elongate tubular member functioning as a drill collar and adapted to be placed in a drill string. The apparatus utilizes a mud driven motor, while th... | 01/22/1980 |
| 4120097 | Pulse transmitter Apparatus is provided for use attached to a pipe string in a well drilling, service or servicing operation to create a signal in a fluid stream flowing in the pipe string and in material of the pipe string in response to indications of down hole sensors. ... | 10/17/1978 |
