دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: see molecular weight.

n: 1. the attraction exerted by the earths mass on objects at its surface. 2. the weight of a body. See API gravity. relative density, specific gravity.

n: the ratio of weight of equal volume of two sunbstances, one of which is taken as a standard. Water is taken as a standard of comparison for liquids and solids ( specific gravity ). For gas, air is usually taken ,although hydrogen is sometimes used.

n: (GSW) the total weight of all petroleum liquids and sediment and water (if any),excluding free water. It is determined by applying the appropriate weight conversion factors to the gross standard volume.

n: a buried weight or anchor to which a guy line is attached. See deadman.

n: a compliant offshore drilling platform used to drill development wells. The foundation of the platform is a relatively lightweight jacket on which all equipment is placed. A system of guy wires anchored by clump weights helps secure the jacket to the seafloor and allows it to move with wind and wave forces. See platform rig.

n: tool used to drive the conductor pipe into the ground. The single-acting diesel is the most popular. as it has the most foot -pounds of energy for the weight of the hammer. Other types of hammer include impact and vibrating.

n: see casing hanget;tubing hanger. hanger-packer n: a device that fits around the top of a string of casing or a string of tubing and supports part of the weight of the casing or tubing while providing a pressuretight seal. See hanger, packer.

a mechanical device that suspends all or part of the weight from a tubular string, transferring the load to the well head and the earth.

n: a device that moves with the heave of a floating offshore drilling rig to prevent the bit from being lifted off the bottom of the hole and then dropped back down (i.e., to maintain constant weight on the bit). It is used with devices such as bumper subs. See motion compensator.

n: refer toheavy weight drill pipe

n: drill pipe that is manufactured with walls that are thicker than those in standard drill pipe. Special extnilength tool joints are attached to the heavier-walled tube. lYPically, 5-inch heavy wall ,.drill pipe weighs50 pounds per foot (75 kilograms per metre);5-inch conventional drill pipe weighs 19.5 pounds per foot (29 kilograms per metre). Also attached to the tube is a centre wear pad that protects the outside diameter of the pipe from abrasion. Heavy wall pipe is often used in the drill stem just above the drill coilars, in the transition zone between the stiffer collars and the more limber drill string, and in place of some drill collars to apply weight on the drill bit in smalliameter and horizontal holes. Sometimes erroneously called heavyweight drill pipe. Compare heavy- weight drill pipe.