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| Number | Title | Issue Date |
| 7350410 | System and method for measurements of depth and velocity of instrumentation within a wellbore A survey tool for use in a wellbore includes a downhole portion having an axis. The downhole portion is adapted to move within the wellbore with the axis generally parallel to the wellbore. The survey tool further includes a first acceleration sensor mounted at a fi... | 04/01/2008 |
| 7310580 | Method for borehole measurement of formation properties The present invention is a method of estimating formation properties by analyzing acoustic waves that are emitted from and received by a bottom hole assembly. A bottom hole assembly may be deployed in a borehole to estimate formation properties. From the bottom hole... | 12/18/2007 |
| 7226037 | System for assuring engagement of a hydromatic brake on a drilling or well service rig The present invention provides an automatic system for engaging the hydromatic brake on a drilling rig or a service rig. This system monitors both the hook load and traveling block velocity, and uses an electrical solenoid to activates the hydromatic when either the... | 06/05/2007 |
| 7210342 | Method and apparatus for determining gas content of subsurface fluids for oil and gas exploration A process to analyze fluid entrained in well boreholes. The process includes gathering trap gas samples from return of drilling mud at multiple depths. The process also includes the steps of subjecting the samples to mass spectrometry in order to determine mass to c... | 05/01/2007 |
| 7114576 | Method and arrangement of controlling of percussive drilling based on the stress level determined from the measured feed rate The rock drill apparatus (1) comprises a rock drill machine (6) provided with a percussion device (4), a feed device (9) and a tool (7), the tool (7) end comprising a bit (8) for breaking rock. The tool (7) is ... | 10/03/2006 |
| 7059427 | Automatic drilling system An automatic drilling system is disclosed which includes an electric servo motor operatively coupled to a winch brake control, a servo controller operatively coupled to the servo motor, and a drum position encoder rotationally coupled to a winch drum. The controller... | 06/13/2006 |
| 7029422 | Ergonomics safety warning device and method to prevent clutch burning This invention will therefore provide a tool to assist the rig operator in perfecting his/her rig operation skills. Disclosed herein is an apparatus and method for minimizing slippage on the drum clutch of a well service rig. A detector senses the motion of the comp... | 04/18/2006 |
| 6968905 | Distributed control system A distributed control system for local or remote control of equipment. The distributed control system provides a communication bridge through a local control panel between a non-real-time network, and a real-time network, such as a controller area network. Both soft... | 11/29/2005 |
| 6915686 | Downhole sub for instrumentation A downhole sub for instrumentation, such as a fiber optic sensor. The sub is configured to be connected to a string of pipe, such as a string of tubing. The sub first comprises an essentially concentric tubular body. The tubular body has an inner diameter that gener... | 07/12/2005 |
| 6854535 | Bore location system and method of calibration A method for calibrating a pitch measurement of a horizontal underground bore location system includes providing a probe having a pitch sensor that measures deviation between a predetermined orientation and a measurement axis. A receiver has an antenna that detects ... | 02/15/2005 |
| 6601658 | Control method for use with a steerable drilling system A control method for use with a steerable drilling system comprises the steps of inputting parametric model data representative of drilling conditions and using the data to determine achievable drilling directions.... | 08/05/2003 |
| 6405136 | Data compression method for use in wellbore and formation characterization A method is disclosed for compressing a frame of data representing parameter values, a time at which each parameter value was recorded, and an orientation of a sensor at the time each parameter value was recorded. Generally the method includes performing ... | 06/11/2002 |
| 6363780 | Method and system for detecting the longitudinal displacement of a drill bit The present invention is a system and method for generating an alarm relative to effective longitudinal behavior of a drill bit fastened to the end of a drill string driven in rotation in a well by a driving device situated at the surface, using a physica... | 04/02/2002 |
| 6324904 | Miniature pump-through sensor modules Sensor modules are provided which are pumped into a well by first being pumped downhole within a drill string, then passing through the drill bit and being circulated uphole in the annulus between the drill string and the borehole of the well. The sensors... | 12/04/2001 |
| 6321596 | System and method for measuring and controlling rotation of coiled tubing The present invention, in certain embodiments, discloses an apparatus for determining characteristics of coiled tubing that is run in and out of a bore, e.g. a wellbore, for calculating fatigue life of the coiled tubing, the apparatus having a reel struct... | 11/27/2001 |
| 6208265 | Electromagnetic signal pickup apparatus and method for use of same An electromagnetic pickup apparatus (46) and method for use of the same is disclosed. The apparatus (46) comprises a probe (60) that is insertable into a bore hole (64) or a trench (70) and a conductive backfill composition (62) that substantially surroun... | 03/27/2001 |
| 5896939 | Downhole measurement of depth The invention is a process and method for determination of the depth of a well during the process of drilling. A computer is housed in the drilling tool and pre-programmed with the data of the planned pattern of the borehole. Changes in the drilling mud p... | 04/27/1999 |
| 5852235 | Method and system for real-time estimation of at least one parameter linked with the displacement of a drill bit The present invention relates to a system and to a method designed to estimate the effective displacement of a drill bit fastened to the end of a drill string and driven into rotation in a well by surface driving means. A non-linear physical model of the ... | 12/22/1998 |
| 5844132 | Method and system for real-time estimation of at least one parameter linked with the behavior of a downhole tool The present invention relates to a system and to a method designed to estimate the effective behaviour of a drill bit fastened to the end of a drill string and driven into rotation in a well by surface driving means, wherein a non-linear physical model of... | 12/01/1998 |
| 5551286 | Determination of drill bit rate of penetration from surface measurements A method of determining the rate of penetration Ɗd of a drill bit at the end of a drill string while drilling a well, comprising: (a) measuring the vertical displacement S of the drill string at the surface, (b) determining a state space description of S comp... | 09/03/1996 |
| 5415030 | Method for evaluating formations and bit conditions A method for evaluating formations and bit conditions is presented. The present invention processes signals indicative of downhole weight on bit (WOB), downhole torque (TOR), rate of penetration (ROP) and bit rotations (RPM), while taking into account bit... | 05/16/1995 |
| 4976143 | System and method for monitoring drill bit depth Methods and apparatus for accurately determining drill bit depth are provided. A hook load is sampled at a rate of at least 4 Hz and is compared to a low threshold to establish a slips-in condition. A determination is made retroactively that the drill str... | 12/11/1990 |
| 4951505 | Block position sensor A block position sensor which is responsive to rotation of a drawworks drum for indicating change in position of a traveling block in a drilling rig is disclosed. The sensor includes elements for providing a first output having a fixed relationship to the... | 08/28/1990 |
| 4876886 | Method for detecting drilling events from measurement while drilling sensors Downhole Torque and Rate of Penetration are utilized to develop indications of formations having high porosity or of the development of an undergauge bit. Downhole torque is normalized by dividing it by the product of downhole weight on bit and bit size t... | 10/31/1989 |
| 4852399 | Method for determining drilling conditions while drilling Downhole torque and rate of penetration are utilized to develop indications of formations that are porous, argillaceous or tight. This information is useful as an aid in selecting drilling practices and drilling bits. The method separates bit effects from... | 08/01/1989 |
| 4852052 | Kelly-to-riser position determining system with adjustment for uncompensated heave A system for determining kelly-to-riser position on floating drilling platforms is presented. The system removes (e.g. filters) uncompensated heave from surface sensor measurements so that bit depth can be accurately calculated. During operation, surface ... | 07/25/1989 |
| 4843875 | Procedure for measuring the rate of penetration of a drill bit The invention relates to a procedure for measuring the rate of penetration VF of a drill bit fixed to the lower end of a drill string lowered into a well. During an initial period, the well is drilled keeping, on average, the value of weight F ... | 07/04/1989 |
| 4831871 | Process and apparatus for calculation of the instantaneous speed of a tool The process consists of pre-positioning conserving a reversible counter with memory (9) in the maximum state, counting the positive pulses in such state, receiving and counting the positive pulses with respect to a predetermined basic step to derive a num... | 05/23/1989 |
| 4773263 | Method of analyzing vibrations from a drilling bit in a borehole Information on tooth wear is obtained from the frequency distribution spectrum of a vibrational quantity influenced by the impact of cutter teeth on the bottom of a bore. For example, spectra may be obtained from the product of signals indicative of torqu... | 09/27/1988 |
| 4736297 | Continuous real time drilling penetration rate recorder An apparatus for providing a real-time monitoring and readout of the drilling progress of a rotary drilled deep well or oil well is connected to the wire of a standard wire line measurement wire and monitors the length paid out as a drill string descends.... | 04/05/1988 |
| 4647853 | Mud turbine tachometer In an MWD measurement system, the speed of rotation of a downhole turbine is measured by the interaction of a triaxial magnetometer in a sensor package and a permanent magnet attached to the turbine shaft. The triaxial magnetometer may be part of an exist... | 03/03/1987 |
| 4616321 | Drilling rig monitoring system In a drilling rig of drill depth conventional structure, parameters of interest (e.g. rate of penetration and drill bit location, number of stands, monkey board position) are calculated and displayed by a unified electronic system. A weight transducer mea... | 10/07/1986 |
| 4610005 | Video borehole depth measuring system A video system measures the position of the traveling block of a drilling rig to determine borehole depth and the rate of drill bit penetration. A television camera is arranged to track the vertical movement of the traveling block of a drilling rig betwee... | 09/02/1986 |
| 4570234 | Oilfield monitor and recorder An oilfield monitor and recorder system providing marker positioning using a leadscrew, a stepper motor, a position sensor, driver and control. The control provides zero, span, slew and range functions. The rate input scaling provides calibration, percent... | 02/11/1986 |
| 4512186 | Drill rate and gas monitoring system Method and apparatus for logging a well during drilling operations to record drilling fluid gas and rate of penetration as a function of depth. The system comprises elements for producing a succession of depth signals in response to applied inputs and app... | 04/23/1985 |
| 4387295 | Pneumatic penetration sensor for oil drilling A device for accurately measuring the position of a traveling block in a drilling rig or the like which is supported by means of a cable wrapped around a drum winch assembly. A pneumatic sensor coupled to the drum provides a predetermined number of output... | 06/07/1983 |
| 4354233 | Rotary drill automatic control system A system for automatic control of a rotary drill comprises a unit for computing the value of drilling tool penetration per single revolution, said unit connected with its inputs to respective transducers and with its output--to an element for comparison o... | 10/12/1982 |
| 4195699 | Drilling optimization searching and control method A searching method for optimizing the rate of penetration of a drill into a given medium based upon the two drilling parameters of thrust and speed of revolution. Preset base values of both parameters are input into the drilling control mechanism at the s... | 04/01/1980 |
| 4156467 | Well drilling system In a well drilling system, a drill bit is raised or lowered through formations surrounding a borehole in response to the movement of a cable onto and off of a drawworks drum. Magnetic markings are affixed to the drum, and a pair of sensors detect rotation... | 05/29/1979 |
| 4114435 | Well drilling system In a well drilling system, a drill bit is raised or lowered through formations surrounding a borehole in a response to the movement of a cable onto and off the drawworks drum. Prior to drilling operations, the drilling system is calibrated by lowering the... | 09/19/1978 |
