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| Number | Title | Issue Date |
| 7412331 | Method for predicting rate of penetration using bit-specific coefficient of sliding friction and mechanical efficiency as a function of confined compressive strength A method for predicting the rate of penetration (ROP) of a drill bit drilling a well bore through intervals of rock of a subterranean formation is provided. The method uses an equation based upon specific energy principles. A relationship is determined between a bit... | 08/12/2008 |
| 7114579 | System and method for interpreting drilling date A method is disclosed for identifying potential drilling hazards in a wellbore, including measuring a drilling parameter, correlating the parameter to depth in the wellbore at which selected components of a drill string pass, determining changes in the parameter eac... | 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 |
| 7035778 | Method of assaying downhole occurrences and conditions A method of assaying work of an earth boring bit of a given size and design including establishing characteristics of the bit of given size and design. The method further includes simulating a drilling of a hole in a given formation as a function of the characterist... | 04/25/2006 |
| 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 |
| 6131673 | Method of assaying downhole occurrences and conditions A method of assaying work of an earth boring bit of a given size and design comprises the steps of drilling a hole with the bit from an initial point to a terminal point. A plurality of electrical incremental actual force signals are generated, each corre... | 10/17/2000 |
| 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 |
| 5794720 | Method of assaying downhole occurrences and conditions A method of assaying work of an earth boring bit of a given size and design comprises the steps of drilling a hole with the bit from an initial point to a terminal point and recording the distance between the initial and terminal points. A plurality of el... | 08/18/1998 |
| 5581024 | Downhole depth correlation and computation apparatus and methods for combining multiple borehole measurements The current invention is directed toward the use of a downhole computer and downhole storage within a measurement-while-drilling (MWD) downhole subassembly to process data from the response of a plurality of sensors of different classes or one or more sen... | 12/03/1996 |
| 5398546 | Determination of drill bit rate of penetration from surface measurements A method of determining, from surface measurements, the rate of penetration Ɗd of a drill bit attached to a drill string suspended from a floating drilling rig by means of a suspension system and a motion compensator, the method comprising: a) determinin... | 03/21/1995 |
| 5321982 | Method for measuring the rate of penetration of an equipment progressing in a well The method comprises using a transmitting unit and at least two receiving units (8,10) arranged in two different places along well equipment (2). Each receiving unit forms an image or signature of wall portions which pass it. The signatures of wall portio... | 06/21/1994 |
| 5274552 | Drill string motion detection for bit depth calculation A motion detector is incorporated on a drilling rig for detection of drill string motion. An output of the motion detector provides an enabling signal for conversion of block height data to bit depth drill string velocity or penetration rate without error... | 12/28/1993 |
| 4961343 | Method for determining permeability in hydrocarbon wells During oil and gas well drilling operations, at the wellsite surface the percentage by volume of hydrocarbon gas present in the return drilling fluid is monitored in order to determine the percentage of gas saturation in the formation. Rate of penetration... | 10/09/1990 |
| 4845628 | Method for optimization of drilling costs Disclosed is a real-time method for minimizing the expected, controllable unit cost over a future drilling interval by simulating the values of selected operating variables and lithologies.... | 07/04/1989 |
| 4794535 | Method for determining economic drill bit utilization Disclosed is a real-time method for determining when a drill bit that is being used in drilling operations should be replaced, given the objective of minimizing the total expected, controllable costs of a well. The basis of the bit replacement decision is... | 12/27/1988 |
| 4747303 | Method determining formation dip The inclination and slope of a bedding plane are determined from oriented measurements of the bending moment generated as a bit encounters and passes completely through the interface between two dissimilar formations. These moments are distinguishable fro... | 05/31/1988 |
| 4685329 | Assessment of drilling conditions In a method of assessing drilling conditions during a drilling operation measurements of torque applied (TOR), weight on bit (WOB), rate of penetration (ROP), and rotation speed (ROT) are gathered. Computed therefrom is a history (60, 61) of points (x, y)... | 08/11/1987 |
| 4627276 | Method for measuring bit wear during drilling A method for measuring the wear of milled tooth bits during oilwell drilling uses surface and subsurface wellsite sensors to determine averaged values of penetration rate, rotation speed and MWD (measurements-while-drilling) values of torque and weight-on... | 12/09/1986 |
| 4419886 | Rate of penetration sensor for oil drilling rigs Apparatus for indicating the change in position of a travelling block coupled to a wire line which is wrapped around a drum, comprising a motion pickup device responsive to the drum for providing a first shaft output having a fixed relationship to the rot... | 12/13/1983 |
| 4389885 | Signal generator for a penetration rate measuring apparatus To measure the penetration rate of a drill string, a signal generator includes a friction wheel that can be engaged with the side of a drum upon which is wrapped a cable used to lower the drill string by turning the drum. The friction wheel is mechanicall... | 06/28/1983 |
| 4367477 | Rate of penetration recorder An apparatus for measuring the rate of movement of one object with respect to another, such as a drilling rate recorder used to measure the rate of penetration of a drill bit during drilling operations. One embodiment of the invention includes a frame, a ... | 01/04/1983 |
| 4138886 | Method and apparatus to measure the rate of advance of a drilling tool on a floating drilling installation The disclosure relates to measurement of the rate of advance of a drill bit from a floating drilling installation. The process includes joining a point of the drilling system, fixed in translation with the movement of the drill string, at the lower extrem... | 02/13/1979 |
| 4085509 | Apparatus for compensating for the heaving of a floating drilling platform for connection with apparatus for measuring the rate of penetration of pipe run into an offshore well Apparatus adapted to compensate for the heaving of a floating offshore drilling platform, which heaves relative to the ocean bottom due to wave action of the water in which the platform is floating, which heave-compensation apparatus is adapted to be conn... | 04/25/1978 |
| 4064749 | Method and system for determining formation porosity A method and/or system for measuring formation porosity from drilling response. It involves measuring a number of drilling parameters and includes determination of tooth dullness as well as determining a reference torque empirically. One of the drilling p... | 12/27/1977 |
