دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a special saddle, or cradle, that holds pipe on a vertical support member in the lowering-up type of pipe laying. The slide-and-guide allows longitudinal movement of the pipe caused by d1ermal expansion and contraction. See lowering-up.

n: a royalty paid when the percentage varies with the volume of production.

n: a 1. special device placed in a string of tubing that can be operated by a wireline tool to open or close orifices to permit circulation between the tubing and the annulus. It may also be used to open or shut off production from various intervals in a well. Also called circulation sleeve, slidingsleeve nipple. 2. a device in a packer that prevents fluid from flowing from the tubing into the annulus.

a downhole piece of equipment in a tubing string that allows flow from annulus to tubing. Usually opened and closed by wireline.

n: An inexact term describing a borehole (and associated casing program) significantly smaller than a standard approach, commonly a wellbore less than 6 in. in diameter. The slimhole concept has its roots in the observed correlation between well costs and vo

a smaller well. Thought to be cheaper to drill, but much more expensive to repair or workover and often limited on fluid flow rate potential.

n: A telescoping joint at the surface in floating offshore operations that permits vessel heave (vertical motion) while maintaining a riser pipe to the seafloor. As the vessel heaves, the slip joint telescopes in or out by the same amount so that the riser b

n: in an electric motor, the difference between the optimal and the actual output of the motor. v: to change the position of the drilling line periodically so that it wears evenly as it is used.

n: see telescoping joint.

n: A kind of equipment of riser system of offshore floating platform,usually be used to compensate the vertical movement of platform caused by stormy waves.





a tubular joint that allows tubing movement.

n: 1. the rate at which drilled solids tend to settle in the borehole as a well is being drilled. 2. difference between the annular velocity of the fluid and the rate at which a cutting is removed from the hole.

n: the difference between the annular velocity of the fluid and the rate at which a cutting is removed from the hole.

n: a procedure to ensure that the drilling line wears evenly throughout its life. After a specified number of ton-miles (mega joules) of use, the line is slipped-i.e., the traveling block is suspended in the derrick or propped on the rig floor so that it cannot move, the dead- line anchor bolts are loosened, and the drilling line is spooled onto the drawworks drum. Enough line is slipped to change the major points of wear on the line, such as where it passes through the sheaves. To pre- vent excess line from accumulating on the drawworks drum, the worn line is cut off and discarded.