دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the weights on a beam pumping unit installed on the end of the walking beam, which is opposite the end over the well. The counterbalance offsets, or balances, the weight of sucker rods and other downhole equipment installed in the well.

n: the apparent loss of weight of an object immersed in a fluid. If the object is floating, the immersed portion displaces a volume of fluid the weight of which is equal to the weight of the object.

n: The upward force acting on an object placed in a fluid. The buoyancy force is equal to the weight of fluid displaced by the object. Buoyancy can have significant effects over a wide range of completion and workover activities, especially in cases in which

the amount of weight that is offset by lift from the fluid when the piece of equipment is immersed in the fluid.

n: a means of preventing the destructive electrochemical process of corrosion of a metal object by using it as the cathode of a cell with a sacrificial anode. Current at least equal to that caused by the corrosive action is directed toward the object, offsetting its electrical potential.

impressed current that offsets the current produced in a corrosion cell and reduces corrosion.

n: a type of chain misalignment that may result from combined angular and offset misalignment, or from two shafts that are not level with each other.

n: the amount by which lines drawn through the centre of each cone of a bit fail to meet in the centre of the bit. For example, in a roller cone bit with three cones, three lines can be drawn through the centre of each cone and extended to the centre of the bit If these cone centrelines do not meet in the bits centre, the coles are said to be offset In general, bits designed for drilling soft formations have more offset than cones for hard formations, because offset affects the angle at which the bit teeth contact the formation. Since soft formations require a gouging and scraping action by bit teeth, high offset achieves the necessary action.

n: Refers to the situation that the axiss of cone dont convergence at the centre line of cone bit.

n: a weight applied to compensate for existing weight or force. On pumping units in oil production, counterweights are used to offset the weight of the column of sucker rods and fluid on the upstroke of the pump, and the weight of the rods on the downstroke.

the rotating weights on a beam lift pump jack that offset the weight of the rod string.

n: The minimum distance between cone axis and centre line of drill bit.

n: A kind of cone bit with no offset, opened outer teeth guidance. Used for drilling vertical well and directional well.

n: Schlumberger wireline tool that records shear, compressional and stoneley waveforms. Used for amplitude variation with offset (AVO) calibration, shear seismic correlation, wellbore stability measurements, sanding analysis, fracture height estimation and s