摘要:
Methods and systems for controlling drilling operations are provided. The methods and systems include conveying a drilling tool into a bore and operating the drilling tool to drill in a direction, creating, with an azimuthal sensing device, a first signal at a first time and a second signal at a second time, wherein each of the first signal and the second signal are indicative of the direction of the drilling tool, and each of the first signal and the second signal are affected by at least one of an unknown but substantially constant offset error or an unknown but substantially constant scale factor error, comparing the first signal with the second signal, and adjusting the drilling direction based on the comparison of the first signal with the second signal.
摘要:
A system for use in corrosive environments includes a first tubular including a first connector portion, and a second tubular including a second connector portion. The first connector portion overlaps the second connector portion to form a connection joint. A magnesium element is arranged between the first connector portion and the second connector portion at the connection joint.
摘要:
An apparatus for drilling a directional wellbore is disclosed that in one non-limiting embodiment includes a drive for rotating a drill bit, a deflection device that enables a lower section a drilling assembly to tilt within a selected plane when the drilling assembly is substantially rotationally stationary to allow drilling of a curved section of the wellbore when the drill bit is rotated by the drive and wherein the tilt is reduced when the drilling assembly is rotated to allow drilling of a straighter section of the wellbore, and a sensor that provides measurements relating a direction of the drilling assembly for drilling the wellbore along a desired direction.
摘要:
A fluid flow control apparatus includes a biasing member applying a biasing force to a closure member, and a sealing member receiving the closure member. A dampener operatively connected to the closure member resists a force applied to the closure member. A fluid seal is formed when the biasing member presses the closure member against the sealing member. The closure member and sealing member may cooperate to control fluid flow along a fluid conduit formed in a wellbore tubular. The apparatus may include an actuator that controls the force applied to the closure member. The actuator may adjust the biasing force, and/or the dampening force. Also, a controller control the actuator may be responsive to a signal generated at a surface location, a downhole location, and/or a signal generated by a sensor.
摘要:
The invention relates to a lower cutter (4) which, together with an associated upper cutter (6), forms the shaving head of a dry shaver. The upper cutter is designed in the form of a perforated foil (6) which at least partially encloses the lower cutter (4) and is prestressed against the same. The lower cutter (4) has a plurality of spaced-apart blades having cutting edges (12, 13) in the form of strips between two peripheral regions (9, 10). The lower cutter (4) is essentially U-shaped in cross section. The width of the strip tapers monotonously from the two peripheral regions (9, 10) in the direction of the center (Z).
摘要:
A shaving foil for an electric shaving apparatus. The shaving foil includes a perforated region with a plurality of holes which are separated from each other by bars. The perforated region is divided at least into two zones, preferably a central zone, a first edge zone, and a second edge zone. The central zone is arranged between the first edge zone and the second edge zone. The holes in the central zone have (i) an average size which is smaller than the average size of the holes in the first edge zone and in the second edge zone, (ii) a floating mean value of the size of the openings in the central zone smaller than a floating mean value of the size of the openings in the first edge zone and the second edge zone, or both (i) and (ii).
摘要:
A multi-channel coil array for use as a transceiver in magnetic resonance imaging (MRI) has a plurality of radio frequency (RF) coils disposed next to one another, devices for electromagnetically decoupling the RF coils and coil elements which are applied onto a planar carrier element (5). The carrier elements (5) have a regular, equilateral polygonal outer contour and the shape of the individual coils (2) corresponds to the outer contour of the carrier element (5). An individual coil (2) has a loop-shaped structure (1), which leads to a decoupling of individual coils (2) not immediately adjacent to each other when a plurality of individual elements are arranged. The space requirement for adding new coils is reduced, and the modular design makes it possible to easily implement any three-dimensional or two-dimensional shape.
摘要:
A shaving foil for an electric shaving apparatus. The shaving foil includes a perforated region with a plurality of holes which are separated from each other by bars. The perforated region is divided at least into two zones, preferably a central zone, a first edge zone, and a second edge zone. The central zone is arranged between the first edge zone and the second edge zone. The holes in the central zone have (i) an average size which is smaller than the average size of the holes in the first edge zone and in the second edge zone, (ii) a floating mean value of the size of the openings in the central zone smaller than a floating mean value of the size of the openings in the first edge zone and the second edge zone, or both (i) and (ii).
摘要:
A shaving head for an electric dry shaver which comprises a base element for carrying at least three cutter units, each providing an outer cutter and an inner cutter arranged to be moved in sliding contact relative to each other, whereby at least one cutter unit comprises a foil-type outer cutter. The shaving head further comprises a first trimmer-type cutting unit that has a plurality of slots defined by a plurality of adjacent bar elements featuring cutting edges. The shaving head comprises a second trimmer-type cutting unit having an outer cutter that comprises a plurality of teeth featuring cutting edges and spaced from each other so as to define a plurality of slits.
摘要:
The invention relates to a lower cutter (4) which, together with an associated upper cutter (6), forms the shaving head of a dry shaver. The upper cutter is designed in the form of a perforated foil (6) which at least partially encloses the lower cutter (4) and is prestressed against the same. The lower cutter (4) has a plurality of spaced-apart blades having cutting edges (12, 13) in the form of strips between two peripheral regions (9, 10). The lower cutter (4) is essentially U-shaped in cross section. The width of the strip tapers monotonously from the two peripheral regions (9, 10) in the direction of the center (Z).