Abstract: The invention relates to variation of concentrations of abrasive particles in a stream of drilling fluid mixed with abrasive particles, passed as an abrasive jet through abrasive nozzle(s) of a drill bit along rotations thereof, to vary the erosive power of the stream along angular sections of the borehole for directional drilling. During subsequent time periods majorities of abrasive particles are alternately deflected into two parallel channels with a different flow resistance. A resulting velocity difference between said majorities makes that the subsequently deflected majorities recombine downstream of the channels, so that high concentration stream portions of the combined majorities are formed which alternate low concentration stream portions. Synchronising the frequency of the stream portions with the rotational velocity of the drill bit results in a consistently higher erosive power of the abrasive jet within a selected angular section of the borehole than outside thereof.

Abstract: The invention relates to increasing a concentration of particles (92) in a circumferentially enclosed stream (90) of a fluid mixed with the particles in a target area (90ct) of a cross-section (90c) of the stream transverse to a flow direction (90f) of the stream. Deflecting surfaces (31.1, 31.2, 31.3) are arranged in the stream to extend over respective angular zones (30?1, 30?2, 30?3) with respect to an axis (la) through the target part. The deflecting surfaces slant in the flow direction in a direction from the circumference of the stream towards the target area, and define angularly in between them multiple bypass openings (32.1, 32.2, 32.3) which extend over angular zones complementary (30?1, 30?2, 30?3) to the angular zones over which the deflecting surfaces extend, and which are larger than the particles. The deflecting surfaces deflect at least a part of the particles inwardly towards the axis.

Abstract: The invention relates to variation of concentrations of abrasive particles in a stream of drilling fluid mixed with abrasive particles, passed as an abrasive jet through abrasive nozzle(s) of a drill bit along rotations thereof, to vary the erosive power of the stream along angular sections of the borehole for directional drilling. During subsequent time periods majorities of abrasive particles are alternately deflected into two parallel channels with a different flow resistance. A resulting velocity difference between said majorities makes that the subsequently deflected majorities recombine downstream of the channels, so that high concentration stream portions of the combined majorities are formed which alternate low concentration stream portions. Synchronising the frequency of the stream portions with the rotational velocity of the drill bit results in a consistently higher erosive power of the abrasive jet within a selected angular section of the borehole than outside thereof.

Abstract: A rotary steerable drill string (16) employs a drill bit (10) selected to positively contribute to underpressure in a preselected azimuthal segment of the borehole relative to an opposing azimuthal section. Generally, a high flow velocity of drilling fluid in the selected azimuthal segment relative to in other segments will result in a more pronounced underpressure in the selected azimuthal segment. Drill bit designs which locally enhance the drilling fluid flow velocity are proposed to be employed in the present rotary steerable drill string.

Abstract: An apparatus and method for downhole measurement during operation of a drilling system is disclosed.

Abstract: An apparatus and method for downhole measurement during operation of a drilling system is disclosed.

Abstract: A rotary steerable drill string (16) employs a drill bit (10) selected to positively contribute to underpressure in a preselected azimuthal segment of the borehole relative to an opposing azimuthal section. Generally, a high flow velocity of drilling fluid in the selected azimuthal segment relative to in other segments will result in a more pronounced underpressure in the selected azimuthal segment. Drill bit designs which locally enhance the drilling fluid flow velocity are proposed to be employed in the present rotary steerable drill string.

Abstract: A system and method for optimized control of an assembly for drilling a borehole comprises a self-tuning, multivariable controller and an optimization engine that manipulates the setpoints of the controller such that drilling performance may be continuously optimized. The method includes evaluation of a characteristic system time constant, using this constant to compute bit ROP, using computed ROP to compute process gains, which are used to tune the multivariable controller, automatically refining controller setpoints based on controller performance, and using an optimization engine to systematically adjust controller setpoints such that drilling parameters are optimized based on any of several performance indicators, or a weighted combination of performance indicators.

Abstract: Drilling mud properties in a mud recirculation system (13) of an oil and/or gas well drilling assembly (1) are automatically adjusted by an automated mud treating assembly (20,25) that is governed hierarchal primary and secondary optimization and control loops (30,31) that continuously keep the density, viscosity, pH and other mud properties within specifications set by a model-based tertiary optimization and control loop to ensure that the mud properties will lead to sufficient drilled cutting transport, borehole stability, drill bit hydraulics, and minimum friction torque and drag.

Abstract: An insert to convert a conventional rotary drill bit to a rotary steerable bit for a rotational directional drilling system. The insert comprises a cylindrical body adapted to be arranged within an intermediate space of the drill bit for receiving drilling fluid from a drill string and selectively directing the drilling fluid to nozzles of the drill bit. The insert may be rotatable and connected to a geostationary platform. Alternatively, the insert may be fixated in the drill bit, combined with a flow diverter connected to a geostationary platform. The insert is suitable to be introduced in the drill bit at a drilling location, including remote locations and off-shore rigs.

Abstract: A system, method and drill string component for directional drilling of a borehole in a formation is presented. The system includes a rotatable drill string, a rotatable drill bit comprising an intermediate space for receiving drilling fluid from the drill string and at least two nozzles for ejecting the drilling fluid. The system also includes a first rotor section, a flow diverter connected to a downhole end of the first rotor section, and a second rotor section being directly drivable by the drilling fluid and being rotatable with respect to the first rotor section in a second direction opposite to the first direction and at a second rotational speed (?3/2). In addition, the system includes a control unit for controlling the second rotational speed (?3/2) of the second rotor section with respect to the first rotor section.

Abstract: A system and method for optimized control of an assembly for drilling a borehole comprises a self-tuning, multivariable controller and an optimization engine that manipulates the setpoints of the controller such that drilling performance may be continuously optimized. The method includes evaluation of a characteristic system time constant, using this constant to compute bit ROP, using computed ROP to compute process gains, which are used to tune the multivariable controller, automatically refining controller setpoints based on controller performance, and using an optimization engine to systematically adjust controller setpoints such that drilling parameters are optimized based on any of several performance indicators, or a weighted combination of performance indicators.

Abstract: The performance of oil/and or gas well drilling equipment is measured by: input and output performance sensor assemblies that monitor associated equipment input and output performance characteristics; and alerting an operator if there is an anomaly between the monitored input and output performance characteristics; and wherein furthermore electric or hydraulic power input characteristics supplied to drilling equipment, such as a mud pump, drill string hoist and top drive are compared with delivered output characteristics, such as mud flux, drill string weight and rotation to alert an operator if there is an anomaly between the measured input and output characteristics.

Abstract: A method, system and bit steering assembly for directional drilling of a borehole in a formation is presented. The method includes the steps of: providing a drill string having a central fluid passage extending along a longitudinal axis of the drill string for passing drilling fluid to the drill bit. The drill bit has a plurality of nozzles for expelling the drilling fluid, wherein each nozzle is arranged eccentrically with respect to the longitudinal axis. The method includes introducing a bit steering assembly, rotating the drill string, and pumping drilling fluid through the central fluid passage. The drilling fluid activates a first impeller of a first rotor section to rotate in a first direction, and activates a second impeller of a second rotor section to rotate in a second direction opposite the first direction. The method includes adjusting a coupling between the first rotor section and the second rotor section.

Abstract: A system and method for optimized control of an assembly for drilling a borehole comprises a self-tuning, multivariable controller and an optimization engine that manipulates the setpoints of the controller such that drilling performance may be continuously optimized. The method includes evaluation of a characteristic system time constant, using this constant to compute bit ROP, using computed ROP to compute process gains, which are used to tune the multivariable controller, automatically refining controller setpoints based on controller performance, and using an optimization engine to systematically adjust controller setpoints such that drilling parameters are optimized based on any of several performance indicators, or a weighted combination of performance indicators.

Abstract: A method for creating a second borehole in an earth formation at a selected orientation relative to a first borehole, wherein a position parameter represents a position of the first borehole. The method comprises: a) providing a borehole element that generates a magnetic field; b) measuring the magnetic field; c) installing the borehole element in the first borehole; d) measuring the magnetic field in the second borehole; e) providing a finite element model of the magnetic field; f) calculating the magnetic field in the second borehole using the finite element model, and determining a difference between the calculated magnetic field in the second borehole and the measured magnetic field in the second borehole; g) adjusting the position parameter so as to minimize said difference; and h) determining a selected direction dependent on the adjusted position parameter and further drilling the second borehole in the selected direction.

Abstract: An abrasive jet drilling system is employed for transmitting information from a downhole location to a surface location. A jet drilling system is provided, with a drill string extending from surface to a downhole location in a borehole. A fluid flow with a mixture of drilling fluid and a quantity of abrasive particles is generated in the drill string. The quantity of abrasive particles in the mixture is modulated in dependence of information obtained regarding a downhole condition, to generate data pulses downhole which are detected at surface. A transmitted downhole condition is determined based on the detected data pulses.

Abstract: An insert to convert a conventional rotary drill bit to a rotary steerable bit for a rotational directional drilling system. The insert comprises a cylindrical body adapted to be arranged within an intermediate space of the drill bit for receiving drilling fluid from a drill string and selectively directing the drilling fluid to nozzles of the drill bit. The insert may be rotatable and connected to a geostationary platform. Alternatively, the insert may be fixated in the drill bit, combined with a flow diverter connected to a geostationary platform. The insert is suitable to be introduced in the drill bit at a drilling location, including remote locations and off-shore rigs.

Abstract: A method, system and bit steering assembly for directional drilling of a borehole in a formation is presented. The method includes the steps of: providing a drill string having a central fluid passage extending along a longitudinal axis of the drill string for passing drilling fluid to the drill bit. The drill bit has a plurality of nozzles for expelling the drilling fluid, wherein each nozzle is arranged eccentrically with respect to the longitudinal axis. The method includes introducing a bit steering assembly, rotating the drill string, and pumping drilling fluid through the central fluid passage. The drilling fluid activates a first impeller of a first rotor section to rotate in a first direction, and activates a second impeller of a second rotor section to rotate in a second direction opposite the first direction. The method includes adjusting a coupling between the first rotor section and the second rotor section.

Abstract: A system, method and drill string component for directional drilling of a borehole in a formation is presented. The system includes a rotatable drill string, a rotatable drill bit comprising an intermediate space for receiving drilling fluid from the drill string and at least two nozzles for ejecting the drilling fluid. The system also includes a first rotor section, a flow diverter connected to a downhole end of the first rotor section, and a second rotor section being directly drivable by the drilling fluid and being rotatable with respect to the first rotor section in a second direction opposite to the first direction and at a second rotational speed (?3/2). In addition, the system includes a control unit for controlling the second rotational speed (?3/2) of the second rotor section with respect to the first rotor section.