Abstract: An integrated drilling system includes a rotary steerable control unit and an electromagnetic LWD control unit deployed in an external collar. The rotary steerable control unit is deployed below the electromagnetic LWD control unit and is configured to control a direction of drilling of the integrated drilling system. A near bit electromagnetic antenna is deployed in a recess on the collar circumferentially about the rotary steerable control unit. At least one electromagnetic transmitter and at least one electromagnetic receiver are deployed in corresponding recesses in the collar circumferentially about the electromagnetic LWD control unit with the at least one transmitter and at least one receiver configured to make electromagnetic logging measurements while drilling. An electrical jumper provides an electrical connection between the near bit electromagnetic antenna and the electromagnetic LWD control unit.

Abstract: An integrated drilling system includes a rotary steerable control unit and an electromagnetic LWD control unit deployed in an external collar. The rotary steerable control unit is deployed below the electromagnetic LWD control unit and is configured to control a direction of drilling of the integrated drilling system. A near bit electromagnetic antenna is deployed in a recess on the collar circumferentially about the rotary steerable control unit. At least one electromagnetic transmitter and at least one electromagnetic receiver are deployed in corresponding recesses in the collar circumferentially about the electromagnetic LWD control unit with the at least one transmitter and at least one receiver configured to make electromagnetic logging measurements while drilling. An electrical jumper provides an electrical connection between the near bit electromagnetic antenna and the electromagnetic LWD control unit.

Abstract: An integrated drilling system includes a rotary steerable control unit and an electromagnetic LWD control unit deployed in an external collar. The rotary steerable control unit is deployed below the electromagnetic LWD control unit and is configured to control a direction of drilling of the integrated drilling system. A near bit electromagnetic antenna is deployed in a recess on the collar circumferentially about the rotary steerable control unit. At least one electromagnetic transmitter and at least one electromagnetic receiver are deployed in corresponding recesses in the collar circumferentially about the electromagnetic LWD control unit with the at least one transmitter and at least one receiver configured to make electromagnetic logging measurements while drilling. An electrical jumper provides an electrical connection between the near bit electromagnetic antenna and the electromagnetic LWD control unit.

Abstract: A method for making electromagnetic logging measurements in a curved section of a subterranean wellbore includes rotating an electromagnetic logging tool (including at least one transmitter and at least one receiver) in the curved section of the wellbore. A curvature value of the curved section of the wellbore is obtained and processed in combination (e.g., via an inversion algorithm) with the electromagnetic measurements to compute at least one property of a formation surrounding the wellbore.

Abstract: A shield for deployment about an antenna on an electromagnetic logging tool includes an electrically conductive, hollow body configured for coaxial deployment about the antenna. The hollow body includes a plurality of slots that extend through the hollow body. An outer surface of the hollow body includes at least one recess, at least a portion of which extends between and substantially orthogonal to the plurality of slots.

Abstract: A method for making calibrated directional electromagnetic logging measurements includes causing an electromagnetic logging tool to make a plurality of voltage measurements while deployed in a subterranean wellbore. A ratio of currents in first and second electromagnetic transmitters is computed and a ratio of gains in first and second electromagnetic receivers is computed. A ratio of selected ones of the measured voltages is processed in combination with the ratio of currents, the ratio of gains, and a test loop calibration coefficient to compute the calibrated directional electromagnetic logging measurement.

Abstract: A method for making calibrated directional electromagnetic logging measurements includes causing an electromagnetic logging tool to make a plurality of voltage measurements while deployed in a subterranean wellbore. A ratio of currents in first and second electromagnetic transmitters is computed and a ratio of gains in first and second electromagnetic receivers is computed. A ratio of selected ones of the measured voltages is processed in combination with the ratio of currents, the ratio of gains, and a test loop calibration coefficient to compute the calibrated directional electromagnetic logging measurement.

Abstract: A helmet includes an outer shell, an intermediate isolator shell, an intermediate damping shell and an inner shell. The helmet further includes inner padding, a plurality of shocks, a plurality of shock mounts and one or more sensors. The helmet can further include an intermediate piston shell, one or more brake pads, a landing padding, and a bottom support. The helmet is configured to provide impact energy absorption and protect a user from brain and/or head injuries. The helmet provides controlled deceleration of the brain so as to prevent or minimize damage to the brain or head of the user. The one or more sensors of the helmet enables an impact detection system to be used concurrently with the helmet. The impact detection system is configured to measure, track, store, and present data collected during each use via a mobile application.

Abstract: A calibration method includes determining calibration standards for a reference tool including a reference transmitter and a reference receiver. First and second calibration factors are measured to match a receiver on an electromagnetic measurement tool (the tool to be calibrated) to the reference receiver and to match a transmitter on the electromagnetic measurement tool to the reference transmitter. The electromagnetic measurement tool is deployed in a subterranean wellbore and used to make electromagnetic measurements therein. The measured first and second calibration factors and at least one of the calibration standards are applied to at least one of the electromagnetic measurements to compute a gain calibrated electromagnetic measurement.

Abstract: A shoe insert includes a generally planar body having a perimeter defining a foot-shaped area on an upper side of the body, the foot-shaped area including first and second toe areas and a heel area configured respectively for placement of a first toe, a second toe, and a heel of a user. The upper side defines a channel extending along an axis passing through a space between the first and second toe areas and the heel area. A linear member may be placed in the channel to protrude from an upper surface of the body. When a user uses the insert, the user's foot may sense the channel (or linear member, if present) and activate mechano-receptors on the bottom of the foot along the channel, which, in-turn, may train the foot to extend in a predetermined position relative to the linear member to improve balance.

Abstract: A calibration method includes determining calibration standards for a reference tool including a reference transmitter and a reference receiver. First and second calibration factors are measured to match a receiver on an electromagnetic measurement tool (the tool to be calibrated) to the reference receiver and to match a transmitter on the electromagnetic measurement tool to the reference transmitter. The electromagnetic measurement tool is deployed in a subterranean wellbore and used to make electromagnetic measurements therein. The measured first and second calibration factors and at least one of the calibration standards are applied to at least one of the electromagnetic measurements to compute a gain calibrated electromagnetic measurement.

Abstract: A method for obtaining gain compensated electromagnetic logging while drilling propagation measurements includes rotating an electromagnetic logging while drilling tool in a subterranean wellbore. The tool includes a plurality of transmitter antennas and a plurality of receiver antennas symmetrically spaced along a logging while drilling tool body with the transmitter antennas including at least one axial transmitter antenna and at least one transverse transmitter antenna and the receiver antennas including at least one axial receiver antenna and at least one transverse receiver antenna. Electromagnetic voltage measurements are acquired from the receiver antennas while rotating. The acquired voltage measurements are processed to compute harmonic voltage coefficients. Ratios of selected ones of the harmonic voltage coefficients are in turn processed to compute gain compensated quantities including symmetrized and anti-symmetrized quantities.

Abstract: An improved protective helmet having an outer impact receiving shell, and inner protective shell and an intermediate piston interposed between the outer and inner shells which allows the inner shell to decelerate gradually when the outer shell is subjected to a sudden impact, and which, therefore, permits the brain to decelerate safely.

Abstract: The boot jack includes a body portion. The body portion has a mouth arranged at one end. The mouth is adapted for receiving a heel of a boot. The boot jack has a first upper surface. The first upper surface is a surface to which force can be applied by a user. The first upper surface is provided on a movable portion. The movable portion is movable relative to the body portion. The movable portion is movable from a first state to a second state. The movement is to expose a second upper surface. The second upper surface is provided on the body portion. The second upper surface is a surface to which force can be applied by the user.

Abstract: A method for obtaining full tensor gain compensated propagation measurements includes processing a full tensor voltage measurement to obtain a fully gain compensated tensor quantity. An electromagnetic logging tool including at least first and second axially spaced transmitters and at least first and second axially spaced receivers is rotated in a subterranean borehole. A plurality of voltage measurements are acquired while rotating to obtain a full tensor voltage measurement which is in turn processed to obtain the fully gain compensated tensor quantity.

Abstract: A method for obtaining full tensor gain compensated propagation measurements includes processing a full tensor voltage measurement to obtain a fully gain compensated tensor quantity. An electromagnetic logging tool including at least first and second axially spaced transmitters and at least first and second axially spaced receivers is rotated in a subterranean borehole. A plurality of voltage measurements are acquired while rotating to obtain a full tensor voltage measurement which is in turn processed to obtain the fully gain compensated tensor quantity.

Abstract: A method for obtaining gain corrected triaxial electromagnetic propagation measurements with an offset correction includes deploying an electromagnetic logging tool in a subterranean borehole. The logging tool includes at least first and second axially spaced triaxial transmitters and at least first and second axially spaced triaxial receivers. A plurality of full tensor voltage measurements may be acquired and processed tensor term by tensor term to obtain a full tensor, gain corrected quantity. The processing may optionally include (i) removing a full tensor voltage offset from the acquired full tensor voltage measurements to obtain a corresponding plurality of offset corrected voltage tensors and (ii) processing the offset corrected voltage tensor term by tensor term to obtain the full tensor, gain and offset corrected quantity.

Abstract: A shoe insert includes a generally planar body having a perimeter defining a foot-shaped area on an upper side of the body, the foot-shaped area including first and second toe areas and a heel area configured respectively for placement of a first toe, a second toe, and a heel of a user. The upper side defines a channel extending along an axis passing through a space between the first and second toe areas and the heel area. A linear member may be placed in the channel to protrude from an upper surface of the body. When a user uses the insert, the user's foot may sense the channel (or linear member, if present) and activate mechano-receptors on the bottom of the foot along the channel, which, in-turn, may train the foot to extend in a predetermined position relative to the linear member to improve balance.

Abstract: A method for making downhole electromagnetic logging while drilling measurements includes rotating an electromagnetic logging while drilling tool in a subterranean wellbore. The logging tool includes a first transmitter and a first receiver deployed on a first sub and a second transmitter and a second receiver deployed on a second sub. Rotating the logging tool causes the first and second subs to rotate at different rates. A plurality of electromagnetic voltage measurements are acquired from the first and second receivers while rotating. The acquired voltage measurements are processed to compute harmonic coefficients which are mathematically rotated to obtain rotated coefficients. Ratios of selected ones of the rotated coefficients are processed to compute gain compensated measurement quantities.

Abstract: A method for obtaining fully gain compensated propagation measurements includes rotating an electromagnetic logging while drilling tool in a subterranean wellbore. The tool includes first and second transmitters and first and second receivers axially spaced apart from one another in which each of the transmitters and each of the receivers include an axial antenna and collocated first and second transverse antennas. The first and second transverse antennas in the first receiver are rotationally offset by a predefined angle from the first and second transverse antennas in the first transmitter. A plurality of electromagnetic voltage measurements are acquired at the first and second receivers while rotating and processed to compute harmonic coefficients. The harmonic coefficients are mathematically rotated through at least the predefined angle to obtain rotated coefficients. Ratios of selected ones of the rotated coefficients are processed to compute fully gain compensated measurement quantities.